Asked/Added Questions From NCERT: Science

Given that: 

α + β = 14  and αβ = -1 

⇒α + β = 14 = -ba ..........(i)

⇒αβ = -1 or αβ = -44 = ca  ....... (ii) 

On comparing both equations we have,

a = 4, b = -1 and c = - 4 

using general quadratic polynomial 

ax² + bx + c 

⇒ 4x² + (-1)x + (-4) 

⇒ 4x² - x - 4 Answer 

-Answered by Master Mind On 13 July 2019:04:50:14 PM

 coal gas , gaseous mixture -mainly methane , carbon monodioxide and hydrogen- formed by the destructive distillation of bituminous fuel and used as a fuel. sometime steam is added to react with a hot coke, thus increasing the yield of gas.

-Answered by nisha sheikh On 13 July 2019:07:34:09 PM

 fossilfuels are fuels that come from old life forms that decomposed over a long period of time. the major three types of fossilfuels are oil, natural gas and coal.

-Answered by nisha sheikh On 12 July 2019:08:30:41 PM

 Liver is the largest gland of the body.

-Answered by Himanshi Verma On 12 July 2019:07:03:58 PM

 The pH value of gastric juice is 1.5 to 3.5.

-Answered by Himanshi Verma On 12 July 2019:06:56:58 PM

-Answered by Nishant Nishant On 12 July 2019:06:04:01 PM

 The is the basic structural unit of kidney.the nephron uses for mechanism to convert blood into urine. its function is filtration, reabsorption, secretion, and excretion of numerous substances.

-Answered by Himanshi Verma On 12 July 2019:06:59:00 PM

आहार श्रृंखला में जीव एक दुसरे का भक्षण करते हैं | इस प्रक्रम में कुछ हानिकारक रासायनिक पदार्थ आहार श्रृंखला के माध्यम से एक जीव से दुसरे जीव में स्थान्तरित हो जाते हैं | इसे ही जैव आवर्धन कहते हैं | 

अन्य शब्दों में, आहार श्रृंखला में हानिकारक पदार्थों का एक जीव से दुसरे जीव में स्थानांतरण ही जैव आवर्धन कहलाता है | 

-Answered by Master Mind On 12 July 2019:12:08:40 AM

मनुष्य को हृदय (heart) को दो बार पम्प कर रक्त को ह्रदय से बाहर भेजना पड़ता है | एक बार दांया आलिन्द रक्त को पुरे शरीर से इक्कठा कर दांया निलय को भेजता है जिसे दांया निलय फुफ्फुस धमनी के द्वारा ऑक्सीजन युक्त होने के लिए फेंफडे तक पहुँचाता है फिर वायां आलिन्द उस ऑक्सीजन युक्त रक्त को इक्कठा कर वायां निलय को भेजता है जिसे वायां निलय पंप कर पुरे शरीर तक पहुँचाता है | इस दौरान ह्रदय को दो बार रक्त को ह्रदय आना पड़ता है अर्थात परिसंचरण करना पड़ता है | इसे ही दोहरा परिसंचरण कहते है |  

-Answered by Master Mind On 11 July 2019:09:33:04 PM

Our atmosphere is fulled with particles which scatter the light coming from the sun. In this scattering the sun light all other colour of the sun light scatter completely but blue colour remain in our atmosphhere this is the reason that our sky looks blue. 

-Answered by ATP Admin On 10 July 2019:11:29:53 PM

Commutator is a device which is used to reverse the direction of the flowing of the electric current. split ring is a such device which works as commutator in a electrical motor.  

-Answered by ATP Admin On 09 July 2019:12:35:25 AM

Principle of electric motor: 

An electric motor works on the principle that a current carrying conductor experiences a force when placed in a magnetic field. If the direction of the magnetic field and that of the direction of a current which pass through the magnetic field are mutually perpendicular then the direction of the force is given by Fleming's left-hand rule. Electric motor convert the electrical energy to mechanical energy. 

-Answered by ATP Admin On 08 July 2019:11:39:15 PM

-Answered by ATP Admin On 08 July 2019:11:30:49 PM

 Plant hormones are :-

1. Auxins= It helps in cell elongation. 

2. Gibberellins= It helps in growth of stem. 

3. Cytokinins= It promote cell division.

4. Abscisic Acid = It inhibit growth. Its effect include wilting of leaves.

5. Ethylene= It help in ripening of fruits.

-Answered by Himanshi Verma On 08 July 2019:04:46:31 PM

 Melting point = The temperature at which any solid get melted is called melting point.

Boiling point= The temperature at which any liquid material get boil is called its boiling point.

-Answered by Himanshi Verma On 07 July 2019:08:24:27 AM

 Oxygen is a by product generated during photosynthesis, exits through stomata root cell walls and other routs. Plants can get rid of excess water by transportation. Plants also excrete some waste substances into the soil around them.

-Answered by Himanshi Verma On 07 July 2019:09:24:57 AM

 Urine formation begins with the delivery of blood to the glomerulus  followed by its filtration past the glomerular barrier. The filtered portion of plasma continues through the nephron whereas the unfiltered portion passes into the peritubular capillaries.

-Answered by Himanshi Verma On 07 July 2019:09:29:46 AM

 The process by which amoeba takes its food is Endocytosis.

-Answered by Himanshi Verma On 06 July 2019:07:14:48 PM

 The alimentary canal is mainly referred to as the pathway by which food enters our body. It is a tube like structure  which starts from  the mouth and ends at the Large intestine. The alimentary canal plays a primary role in the human digestion process and is also termed as the digestive tract.

-Answered by Himanshi Verma On 07 July 2019:09:36:43 AM

 A substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction is called enzymes.

-Answered by Himanshi Verma On 06 July 2019:07:23:55 PM

Its functions are:-

1. It helps in exchange of gases Co₂, and O_2.

2. Its helps in transpiration.

3. Its helps in absorption. 

-Answered by Himanshi Verma On 06 July 2019:07:16:36 PM

 The process which required for maintenance growth and required for sustain life is called life process.

The process which is body are:-

1. Excretion

2. Nutrition

3. Respiration

4. Transportation

5. Control and coordination

-Answered by Himanshi Verma On 07 July 2019:08:28:09 AM

 A thread or filament like structure which is obtained from plants and chemical substances is called fibre. Fibres are used to make yan and fabrics.

-Answered by ATP Admin On 05 July 2019:10:59:33 PM

 The process of movement of ions into roots cell is called active transport. 

-Answered by Himanshi Verma On 07 July 2019:08:35:56 AM

Urea and chloride are two main constitutions of urine. Urine is a liquid byproduct of the body which is secreted by kidney, this process is called urination and passes out through urethra.

-Answered by ATP Admin On 05 July 2019:11:07:33 PM

 Excrete out the waste materials from the body is called excretion. Excretion is mainly performed by kidney and skin. 

-Answered by ATP Admin On 05 July 2019:10:56:58 PM

In plants or trees, there is steady movement of water in root xylem, creating a column of water that is steadily pushed upwards. 

Sometimes this pressure is unlikely to be enough to move water over the heights. So the tall tree uses an another strategy to move water in the xylem upwards to the highest point of the plant body. The plant has an adequate supply of water, the water which is lost through the stomata is replaced by water from xylem vessels in the leaf. This transpiration of water molecules from the cells of leaves creates a suction which pulls water from root xylem. This process continuously helps the tall tree to movement of water upward.     

-Answered by ATP Admin On 05 July 2019:11:34:24 PM

The heart consists of four chambers. There is a valve through which blood passes before leaving each Chambers of the heart. The valves prevent the backward flow of blood.

-Answered by Himanshi Verma On 08 July 2019:05:09:22 PM

Aquatic animal take their breath from the oxygen dissolved in water which is less amount than that of other animal like terrestrial animal. Because of terrestrial animal breaths in much amount of oxygen. Hence aquatic animals have to take more breath than the others. So breathing rate is much faster. 

-Answered by ATP Admin On 05 July 2019:11:50:34 PM

Events of the photosynthesis is as follows:

(i) Absorption of light energy by chlorophyll.

(ii) Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen. 

(iii) Reduction of carbon dioxide to carbohydrates. 

-Answered by ATP Admin On 05 July 2019:11:56:38 PM

 (a) sugar C12H22O11

 (b) Glucose C6H12O6

 (c) Vinegar CH3COOH

 (d) Pyruvic C3H4O3

 (e) Tartaric C4H6O6

-Answered by Akki chauhan On 05 July 2019:09:13:27 AM

 An amphoteric compound is a molecule or ion that can react both as an acid and as a base many metal such as zinc , copper , tin , lead , aluminium beryllium formed amphoteric oxides.

-Answered by Akki chauhan On 05 July 2019:09:00:26 AM

 Cooking utensils are made up of metal because utensils need to conduct heat well, but also need to chemically unreactive so that they do not alter the flavor of the food . most material that conductive enough to heat evenly are to use in food preparation.

-Answered by Akki chauhan On 05 July 2019:09:05:00 AM

 1. Metal have high M.P and B.P.

2.  Metal are good conductor of heat and electricity.

3. Metals react with air and corrode.

-Answered by Himanshi Verma On 01 July 2019:07:31:12 PM

 Thermit reaction is the reaction in which 3 parts of iron oxide and one part of aluminium is taken and ignited by burning magnesium and barium peroxide. Aluminium is reducing agent so it reduces iron oxide to molten iron.

-Answered by Himanshi Verma On 02 July 2019:07:24:36 PM

 The reaction in which two or more substances that combined together to form a single product are known as combination reaction.

-Answered by Himanshi Verma On 02 July 2019:07:27:23 PM

 Displacement reaction= Those reaction in which an atom or group of atom is replaced by another atom and group of atom are called displacement reaction.

Double Displacement reaction= These are the reaction in which exchange of ions between the reactants are called double displacement reaction.

-Answered by Himanshi Verma On 02 July 2019:07:29:42 PM

 Exothermic Reaction= The reaction in which heat is evolved and heat is produced in large amount is called exothermic reaction.

Endothermic Reaction= The reaction in heat is absorbed and heat is not produced is called endothermic reaction.

-Answered by Himanshi Verma On 02 July 2019:07:32:42 PM

 There are two physical quantities  which can change the state of matter:-

1. Temperature

2. Pressure

-Answered by Himanshi Verma On 07 July 2019:08:48:56 AM

 combustion is a process of reaction of a substance with oxygen there are 

-Answered by Hitesh kumar On 11 May 2019:08:29:25 AM

 Chemical reactions can be categorized principally into four basic types. These do not cover all reactions though. Some, such as redox reactions may fit into more than one category.

-Answered by sonu kumar On 07 May 2019:10:17:34 AM

 Chemical reactions can be categorized principally into four basic types. These do not cover all reactions though. Some, such as redox reactions may fit into more than one category.

-Answered by Sonu kumar On 08 May 2019:08:41:06 AM

A chemical is any substance consisting of matter. This includes any liquid, solid, or gas. A chemical is any pure substance (an element) or any mixture (a solution, compound, or gas). Chemicals occur naturally and can be made artificially.

-Answered by sonu kumar On 07 May 2019:10:14:36 AM

  Except HNO3, Aluminum reacts with other mineral acids to form their respective salts and liberate Hydrogen gas. However with HNO3, it forms an oxide coating over the metal. It renders metal passive and protects the metal from further attack of the acid.

-Answered by Sonu kumar On 08 May 2019:08:17:51 AM

 5 mins ago - Which of the following reaction takes place when aluminium react withsodium hydroxide? Science Chemical ... sodium hydroxide? -Added by ...

-Answered by sonu kumar On 07 May 2019:10:13:00 AM

  services within an economy.he term 'industry' implies an economic activity involving goods production, mineral extraction or provision of consumer services. Industry is the production of goods or related

-Answered by sonu kumar On 06 May 2019:10:34:37 AM

 Plantation agriculture is a form of commercial farming where crops are grown for profit. Large land areas are needed for this type of agriculture. Countries that haveplantation agriculture usually experience tropical climate with high annual temperatures and receive high annual rainfall.

-Answered by sonu kumar On 06 May 2019:10:30:03 AM

 Sep 9, 2018 - आज के युग में लगभग सभी लोग कंप्यूटर से परिचित होंगे क्योंकि लगभग हर जगह मतलब की सभी ऑफिस में, स्कूल में, कॉलेज में इत्यादी जगह पर कंप्यूटर का उपयोग होता है| अब तो लगभग सभी लोगो के घर में कंप्यूटर मौजूद होता है| Computer का उपयोग आजकल हर .... मौसम के बारे में पहले पता लग जाता है और उसके बाद हम मौसम के हिसाब से अपना routine बनाते हैं की आज क्या करना है, कब करना है, ... 10. Banking. बैंकिंग क्षेत्र में कंप्यूटर का इस्तेमाल अपने customer का record रखने के लिए किया जाता है| तरह तरह के ...

-Answered by Sonu kumar On 06 May 2019:08:37:01 AM

 ऐसा कोइ भी पदार्थ जो शर्करा (कार्बोहाइड्रेट), वसा, जल तथा/अथवा प्रोटीन से बना हो और जीव जगत द्वारा ग्रहण किया जा सके, उसे भोजन कहते हैं। जीव न केवल जीवित रहने के लिए बल्कि स्वस्थ और सक्रिय जीवन बिताने के लिए भोजनकरते हैं। भोजन में अनेक .

-Answered by Sonu kumar On 06 May 2019:08:30:14 AM

 Chlorofluorocarbon(CFC) is any of various halocarbon compounds consisting of carbon, hydrogen, chlorine, and fluorine. CFC were once used widely as aerosol propellants and refrigerants.Chlorofluorocarbons are believed to cause depletion of the atmospheric ozone lay

-Answered by Hitesh kumar On 05 May 2019:08:18:33 AM

-Answered by Hitesh kumar On 05 May 2019:08:20:43 AM

 Jan 18, 2018 - तुफैल इदरीसी अमेठी: भारतीय कृषि जैविक केंद्र गाजियाबाद देश में एक बहुत बड़ी क्रांति लाने में सफल हुए हैं आज जहां किसान महंगे रासायनिक खाद कीटनाशक आदि का उपयोग करते-करते अपने खेत की मिट्टी को अनुपजाऊ कठोर और जहरीला बना ...

-Answered by Sonu kumar On 06 May 2019:08:31:46 AM

 इस भाग में संरक्षण खेती के फायदे की जानकारी दी गई है। ... का गिरना, भू-जलस्तर में गिरावट, कृषि मजदूरों में कमी व कृषि आयातों की बढ़ती कीमतों की वजह से पारम्परिक खेती के अन्तर्गत उत्पादन खर्च में वृद्धि व शुद्ध मुनाफे में कमी हो रही है।

-Answered by Hitesh kumar On 05 May 2019:08:26:53 AM

 Fusioiplon. During sexual reproduction, a male and female gamete will merge together to form a new organism. The two haploid cells will fuse together to form a did cell called a zygote.

-Answered by rocki kumar On 04 May 2019:10:01:56 AM

 Some simple animals, many of whom are single celled, reproduce asexually. The different modes of asexual reproduction in animals include gemmules (sponges),fragmentation (planarians), regeneration (echinoderms) and parthenogenesis (ants, wasps

-Answered by rocki kumar On 04 May 2019:10:03:42 AM

 कोशिका (Cell) सजीवों के शरीर की रचनात्मक और क्रियात्मक इकाई है और प्राय: स्वत: जनन की सामर्थ्य रखती है। यह विभिन्न पदार्थों का वह छोटे-से-छोटा संगठित रूप है जिसमें वे सभी क्रियाएँ होती हैं जिन्हें सामूहिक रूप से हम जीवन कहतें हैं

-Answered by sonu kumar On 03 May 2019:10:29:20 AM

 यह एक प्रकार की ऊर्जा है जब प्रकाश हमारी आँख की रेटिना पर पड़ता है तो इसके रेटिना पर गिरने से दृष्टि संवेदना उत्पन्न होती है और हमें वस्तुएं दिखाई देती है। प्रकाश ...

-Answered by ravi varma On 03 May 2019:10:07:11 AM

 Asexual reproduction is a type of reproduction by which offspring arise from a single organism, and inherit the genes of that parent only; it does not involve the fusion of gametes, and almost never changes the number of chromosomes. ... Many plants and fungi sometimes reproduce asexually.

-Answered by sonu kumar On 03 May 2019:10:19:01 AM

The internal organs of the male reproductive system, also called accessoryorgans, include the following: Epididymis: The epididymis is a long, coiled tube that rests on the backside of each testicle. It transports and stores sperm cells that are produced in the testes. 

-Answered by ravi varma On 03 May 2019:10:12:38 AM

 किसी तत्त्व या यौगिक का द्रव अवस्था से गैस अवस्था में परिवर्तन वाष्पीकरण (Vaporization या vaporisation) कहलाता है। वाष्पीकरण दो प्रकार का होता है- वाष्पन, तथा क्वथन। इन्हें भी देखें[संपादित करें]. वाष्पन (evaporation); क्वथन · संघनन · ऊर्ध्वपातन.

-Answered by ravi varma On 03 May 2019:10:15:48 AM

  प्रकाश एक प्रकार की ऊर्जा है, जो विद्युत चुंबकीय तरंगों के रूप में संचारित होती है। इसका ज्ञान हमें आँखों द्वारा होता है इसका तरंग दैर्ध्य 3900 Ӑ से 7800 Ӑ के बीच होता है। प्रकाश का विद्युत चुंबकीय तरंग सिद्धांत प्रकाश के केवल ...

-Answered by Hitesh kumar On 03 May 2019:08:37:57 AM

 The difference between internal and external fertilization is that internal fertilization occurs inside the body, whereas external fertilizationhappens outside the body. Fertilization is the process by which a sperm cell and an egg cell unite to form a completely new individual.

-Answered by sonu kumar On 03 May 2019:10:50:56 AM

 The difference between internal and external fertilization is that internal fertilization occurs inside the body, whereas external fertilizationhappens outside the body. Fertilization is the process by which a sperm cell and an egg cell unite to form a completely new individual.

-Answered by ravi varma On 03 May 2019:10:23:30 AM

 Metamorphosis. Metamorphosis, in biology, striking change of form or structure in an individual after hatching or birth. ... Examples of metamorphosis include the tadpole, an aquatic larval stage that transforms into the land-dwelling frog (class Amphibia).

-Answered by sonu kumar On 03 May 2019:10:32:07 AM

 . क्या सभी जीवों को एक ही किस्म के भोजन की आवश्यकता होती है? Answer: नही, सभी जीवों को एक ही किस्म के भोजन की आवश्यकता नही होती है विभिन्न तरह के जीवों को विभिन्न तरह के भोजन कि आवश्यकता होती है। जैसे: शाकाहारी जीव 

-Answered by sonu kumar On 03 May 2019:10:27:39 AM

 Human fertilization is the union of a human egg and sperm, usually occurring in the ampulla of the fallopian tube. The result of this union is the production of a zygote cell, or fertilized egg, initiating prenatal development. ... The process of fertilizationinvolves a sperm fusing with an ovum.

-Answered by ravi varma On 03 May 2019:10:32:12 AM

 17अक्टूबर1887

-Answered by rocki kumar On 04 May 2019:08:21:07 AM

  समांगी मिश्रण : ऐसे मिश्रण जिसमें दो या दो से अधिक अवयव उपस्थित होते हैं किंतु उंहें अलग-अलग देखा नहीं जा सकता उन्हें समांगी मिश्रण कहते हैं। उदाहरण : नमक और पानी का मिश्रण. विषमांगी मिश्रण : ऐसे मिश्रण जिनमें दो या दो से ...

-Answered by priyanshu kumar On 02 May 2019:10:56:10 AM

  Nonmetal or non-metal is a chemical element thatdoes not have the properties of a metal. ... Usually, gases or brittle solids are non-metals. Elements on the periodic table can be classified as metal, semimetal, or non-metal. Five times more elementsare metals than nonmetals.

-Answered by priyanshu kumar On 02 May 2019:10:58:43 AM

 These steps, as well as many others, are things we all can do to help reduce air pollution. Conserve energy – remember to turn off lights, computers, and electric appliances when not in use. Use energy efficient light bulbs and appliances. Participate in your local utility's energy conservation programs

-Answered by Hitesh kumar On 27 April 2019:08:28:20 AM

 Drinking or swimming in unclean water can cause: Vomiting or diarrhea. A sick stomach. ... Reproductive problems (Some kinds of reproductive problems, like infertility, can happen afterdrinking polluted water for a long period of time)

-Answered by priyanshu kumar On 29 April 2019:10:36:20 AM

 how would the disposal of garbage affect the living organisms in the river. Groundwater contamination from pesticides causes reproductive damage within wildlife in ecosystems. ... Ecosystems are destroyed by the rising temperature in the water, as coral reefs are affected by the bleaching effect due to warmer temperatures.

-Answered by priyanshu kumar On 29 April 2019:10:41:40 AM

 These steps, as well as many others, are things we all can do to help reduce air pollution.

-Answered by priyanshu kumar On 30 April 2019:10:16:26 AM

 Jan 19, 2019 - Which of the following is 'NOT' true? Options: A) Teaching Is An Art. B) Teachers Can Be Trained. C) Teachers Are Born. D) All Of The Above ...

-Answered by priyanshu kumar On 29 April 2019:10:44:53 AM

 Chlorofluorocarbons and ozone. Many people have heard that the ozone hole is caused by chemicals called CFCs, short for chlorofluorocarbons. CFCs escape into the atmosphere from refrigeration and propellant devices and processes. In the lower atmosphere, they are so stable that they persist for years, even decades.Oct 18, 2018

-Answered by Sonu kumar On 30 April 2019:10:16:54 AM

 Answer: The Partition of India in 1947 led to a massive transfer of populations on both sides of the new border. As a result, the population of Delhi swelled, the kinds of jobs people did changed, and the culture of the city became different. ... Thousands of people in Delhi were killed and their homes looted and burned.

-Answered by priyanshu kumar On 30 April 2019:10:26:31 AM

 Damage to the inner ear. Aging and exposure to loud noise may cause wear and tear on the hairs or nerve cells in the cochlea that send sound signals to the brain. When these hairs or nerve cells are damagedor missing, electrical signals aren't transmitted as efficiently, and hearing loss occurs.

-Answered by Sohail alam On 26 April 2019:08:43:39 AM

 The truck BHA007 features the insanely loud, india-made, truck Horns. These horns are ridiculously loud and, more importantly, actually sound like a blast! The horns are hand-tuned in the india. Simply put, they sound completely authentic. ... responsibility to comply with local noise ordinances and D.O.T. sound level laws.

-Answered by Sohail alam On 26 April 2019:08:46:36 AM

 Yes I feel the vibrations.

-Answered by priyanshu kumar On 26 April 2019:08:46:49 AM

 Election law is a discipline falling at the juncture of constitutional law and political science. It researches "the politics of law and the law of politics". The conceptual knowledge behind election law focuses on who votes, when that person can vote, and the construction behind the tabulated totals.^[1]

-Answered by Sohail alam On 26 April 2019:08:01:10 AM

 An incident ray is a ray of light that strikes a surface. ... The reflected ray corresponding to a given incident ray, is the ray that represents the lightreflected by the surface. The angle between the surface normal and the reflected ray is known as the angle of reflection.

-Answered by priyanshu kumar On 26 April 2019:09:02:27 AM

 An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.

-Answered by priyanshu kumar On 26 April 2019:08:54:16 AM

 The function of iris is to control the diameter and size of the pupil and the functionof pupil is to control the amount of light that enters the eye. The primary function of the human pupil is to regulate the amount of light that enters the eye.

-Answered by Sohail alam On 26 April 2019:08:56:45 AM

 A female given name, a variant of Corinna.

-Answered by priyanshu kumar On 26 April 2019:08:55:16 AM

 Wavelength is also measured in metres (m) - it is a length after all. The frequency, f, of a wave is the number of waves passing a point in a certain time. We normally use a time of one second, so this gives frequency the unit hertz (Hz), since one hertz is equal to one wave per second.

-Answered by priyanshu kumar On 26 April 2019:08:57:15 AM

 Units. The SI derived unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz. One hertz means that an event repeats once per second.

-Answered by priyanshu kumar On 26 April 2019:09:00:24 AM

 of compressions and rarefactions in the elastic medium, as illustrated by Figure 1.1(a). When .... to a distance from the source equal to about a wavelength of sound or equal to three times the .... The minimum audible level occurs at .... such as barriers and reflectors on the sound pressure level at an observation point.

-Answered by priyanshu kumar On 26 April 2019:08:58:14 AM

 The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions,humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditorychannel of the cochlea.

-Answered by priyanshu kumar On 26 April 2019:09:01:00 AM

 echo. An echo is a repetition or imitation of sound. When sound waves hit a hard surface they might reflect, making the sound bounce and repeat.

-Answered by priyanshu kumar On 26 April 2019:09:03:16 AM

ans.The LIFE-CYCLE OF A BUTTERFLY. Butterflies and moths undergo complete metamorphosis in which they go through four different life stages. Egg - A butterflystarts its life as an egg. Larva - The larva (caterpillar) hatches from an egg and eats leaves or flowers almost constantly. 

-Answered by Nishant verma On 25 April 2019:05:34:29 PM

ans.Chemical Properties of Bases

-Answered by Nishant verma On 25 April 2019:05:35:46 PM

 ans. Nitric acid, sulfuric acid, hydrocloric and all organic acids. ... They all can be created naturaly, though not all of them exist in nature as acid, becouse some of them react imediately with its suroundings or is unstable in some way. You could say there is some sort of fancy acid .

-Answered by Nishant verma On 25 April 2019:05:38:09 PM

 ans.

natural gas

flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground (often in association with petroleum) and used as fuel.

-Answered by Nishant verma On 25 April 2019:05:45:42 PM

 Mar 22, 2018 - Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. How will she find the nature of the gas? Write down word ...

-Answered by Sonu kumar On 30 April 2019:10:26:14 AM

 Mar 22, 2018 - Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. How will she find the nature of the gas? Write down word ...

-Answered by priyanshu kumar On 30 April 2019:10:19:44 AM

 question_answer 1) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas? (b) Write ...

-Answered by Sonu kumar On 30 April 2019:10:22:29 AM

 ans.Aluminium foils are used to wrap food items because aluminium being a soft malleable metal it can be beaten to in sheets to form thin wrapping sheets. Moreover it does not react with food items. Immersion rods are made of metallic substances metals are good conductors of heat and electricity.

-Answered by Nishant verma On 25 April 2019:05:53:30 PM

 Aug 21, 2013 - Alpha waves are rhythmical electrical fields generated in the brain. ... So why don't we see something roughly 10 times every second? ... well, showing that there is a frequency correspondence does not suffice, one would ...

-Answered by priyanshu kumar On 30 April 2019:10:24:33 AM

 Apr 23, 2019 - Give an example of plant that belongs to group Bryophyta? ... Chapter 12 Reproduction In Plants (3) ... Conservation Of Plant And Animals (1).

-Answered by rocki kumar On 04 May 2019:08:27:07 AM

 some examples of angiosperms are as follows: Apple (Malus pumila) Brinjal (Solanum melongena) Guava (Psidium guajava) Jackfruit (Artocarpus heterophyllus) Litchi (Litchi chinensis) Mango (Mangifera indica) Papaya (Carica papaya) Pea (Pisum sativum)

-Answered by Sohail alam On 24 April 2019:08:08:20 AM

 Female pine cones hold the seeds whereas male pine cones contain the pollen. Most conifers, or cone-bearing trees, have female and male pine cones on the same tree. A female pine cone, also called a megasporangiate strobilus, consists of cone or seed scales that hold two ovules, the unfertilized seeds.

-Answered by Sohail alam On 24 April 2019:08:11:06 AM

 A cone (in formal botanical usage: strobilus, plural strobili) is an organ on plants in the division Pinophyta (conifers) that contains the reproductive structures. The familiar woody cone is the female cone, which produces seeds.

-Answered by Sohail alam On 24 April 2019:08:18:29 AM

 The king was told that in order to decide the right time for doing something, it was necessary to look into the future. Since only magicians could do so, he wasadvised to go to magicians

-Answered by rocki kumar On 05 May 2019:08:45:31 AM

 Mar 27, 2018 - Mention the shape of chloroplast in spirogyra give one identifying feature of the group to which spirogyra belongs.

-Answered by priyanshu kumar On 30 April 2019:10:31:48 AM

 Basidiomycota, The biological name of mushroom

-Answered by Sohail alam On 24 April 2019:08:12:29 AM

 - What is common name for Funaria and Dryopteris? Science ORGANISATION IN THE LIVING ... Mathematics (100) · General Knowledge (387).

-Answered by rocki kumar On 08 May 2019:08:10:58 AM

 Algae, singular alga, members of a group of predominantly aquatic photosyntheticorganisms of the kingdom Protista. Algae have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 metres (200 feet) in length

-Answered by Sonu kumar On 02 May 2019:10:11:33 AM

 a part of an organism which is typically self-contained and has a specific vital function.

-Answered by Sonu kumar On 02 May 2019:10:26:45 AM

 Carbon is a chemical element, like hydrogen, oxygen, lead or any of the others in the periodic table. Carbon is a very abundant element. It exists in pure or ...

-Answered by Sonu kumar On 02 May 2019:10:23:55 AM

 What is force? This definition explains what force is in the physical sciences and discusses its properties.

-Answered by Sonu kumar On 02 May 2019:10:29:27 AM

 tation agriculture is a form of commercial farming where crops are grown for profit. Large land areas are needed for this type of agriculture. Countries that have plantation agriculture usually expePlanrience high annual temperatures and receive high annual rainfall. Plantation agriculture as mentioned above was introduced ...

-Answered by sonu kumar On 06 May 2019:10:32:15 AM

 As far as we know, human beings are the only creatures on earth that possess a brain developed to such an extent that they can ask this question of themselves: ...

-Answered by Sonu kumar On 02 May 2019:10:35:37 AM

 Density is constant for given substance or material. So, when it is cast into different shapes, the density of the material remains same as before.

Density is defined as the mass of the substance per unit volume. 

Density = Mass / Volume.

Mass of the metal cylinder and that of the cube will be same when measured via spring balance experiment. 

Mass of water displaced in both cases doesn't change. 

Similarly, volume of the water displaced in the measuring unit of the spring balance remains same in both the scenario.

So, density remains same. 

-Answered by Hitesh kumar On 22 April 2019:03:24:11 PM

 39 °F

-Answered by Sohail alam On 22 April 2019:03:28:08 PM

 The mass of the displaced fluid can be expressed in terms of the density and its volume, m = ρV. The fluid displaced has aweight W = mg, where g is acceleration due to gravity. Therefore, the weight of the displaced fluid can be expressed as W = ρVg.

-Answered by rocki kumar On 08 May 2019:08:22:19 AM

 Now, if we immerse an object into this bucket full of water, then the object will ... a bucket of water which is not filled to the brim, then the object will displace water ...

-Answered by priyanshu kumar On 04 May 2019:08:27:13 AM

 The amount of fluid displaced is directly related (via Archimedes' principle) to its volume. In the case of an object that sinks (is totally submerged), the volume of the object is displaced. In the case of an object that floats, the amount of fluid displaced will be equal in weight to the displacing object.

-Answered by priyanshu kumar On 06 May 2019:10:02:39 AM

 We can then know the volume of the object: it is equal to the volume of fluid displaced.

-Answered by priyanshu kumar On 06 May 2019:10:03:51 AM

 Is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water. ... If the reference material is water then a substance with a relative density (or specific gravity ...

-Answered by rocki kumar On 07 May 2019:08:21:19 AM

 An isotonic solution refers to two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side

-Answered by Rohit Rajput On 08 May 2019:08:33:35 AM

 The main difference between endosmosis and exosmosis is that endosmosis is the movement of water into the cell whereas exosmosis is the movement of water out of the cell. Endosmosis occurs when cells are placed in hypotonic solutions. ... Exosmosis occurs when cells are placed in hypertonic solutions.

-Answered by Rohit Rajput On 08 May 2019:08:34:40 AM

When raisins are kept in water for a few hours, the raisins will swell up or theywill expand in size. This happens due to osmosis, which is the movement of molecules from a region of its higher to its lower concentration through a semi or selectively permeable membrane. ... When raisins are soaked in water, they swell. 

-Answered by rocki kumar On 08 May 2019:08:28:45 AM

 It gives strength to the plants.

-Answered by Himanshi Verma On 14 May 2019:11:20:29 AM

-Answered by priyanshu kumar On 22 April 2019:09:12:41 AM

 Sarcoiemma

-Answered by priyanshu kumar On 22 April 2019:09:11:24 AM

 Striated muscle

-Answered by priyanshu kumar On 22 April 2019:09:08:39 AM

 Lignin.

-Answered by priyanshu kumar On 22 April 2019:09:07:59 AM

 Cell body axon and dendrite.

-Answered by priyanshu kumar On 22 April 2019:09:04:42 AM

  Sclerenchyma

-Answered by priyanshu kumar On 22 April 2019:08:54:37 AM

 Nerve cell.

-Answered by priyanshu kumar On 22 April 2019:08:53:05 AM

 Tissue is a group of cells of similar structure and function.

-Answered by priyanshu kumar On 22 April 2019:08:48:56 AM

 They are irregular in shape.

-Answered by priyanshu kumar On 22 April 2019:08:39:24 AM

 Iodine solution

-Answered by priyanshu kumar On 22 April 2019:08:29:07 AM

 Potato and Rice.

-Answered by priyanshu kumar On 22 April 2019:08:36:40 AM

 Carbon Dioxide

-Answered by Akki chauhan On 05 July 2019:09:20:09 AM

 Magnesium oxide is basic in nature as it is a metalic oxide and its aqueous solution gives (OH^-) ions so it turns red litmus paper into blue in colour. 

-Answered by ATP Admin On 17 June 2019:01:24:07 AM

  Hydrogen gas.

-Answered by Hitesh kumar On 22 April 2019:08:01:26 AM

 It is basic in nature. 

-Answered by Hitesh kumar On 22 April 2019:08:03:01 AM

  When Iron nail (Ferrum) is dipped in Copper sulphate (CuSO4) there takesreaction between them and coppersulphate change its color from blue to light green. ... 2) colour of the solution turns from blue to light green. The formula for this reaction is: Fe + CuSO4 --> FeSO4 + Cu. Here, Fe is more reactive than Cu.

-Answered by Hitesh kumar On 22 April 2019:08:03:50 AM

 Double Displacement reaction.

-Answered by Hitesh kumar On 22 April 2019:08:04:55 AM

 In Decomposition reaction a compound breaks down to give two or more simpler substances. In this reaction there is only one reactant. Decomposition reaction is the opposite of a combination reaction. E.g : 1.Mercury (II) oxide on heating decomposes to give Mercury and oxygen.

-Answered by Hitesh kumar On 22 April 2019:08:08:05 AM

 it get colourless.

-Answered by Himanshi Verma On 21 April 2019:11:20:48 AM

 The reaction in which the highly reactive element displace the less reactive element is called displacement reaction.

-Answered by Himanshi Verma On 21 April 2019:11:22:06 AM

 A reaction in which a single product is formed from two or more rectant is known as combination reaction.

-Answered by Himanshi Verma On 21 April 2019:11:07:53 AM

 The reactant in which a single reactant breaks down into two or more than two simpler products is called decomposition reaction.

-Answered by Himanshi Verma On 21 April 2019:11:09:12 AM

 Copper displace iron from ferrous sulphate because copper is highly rective metal.

-Answered by Himanshi Verma On 21 April 2019:11:10:50 AM

Arrangement of metals in a vertical column in decreasing order of their reactivity mis called reactivity series.

-Answered by Himanshi Verma On 21 April 2019:10:56:48 AM

 In a flame of pure hydrogen gas, burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) and releases heat. If carried out in atmospheric airinstead of pure oxygen (as is usually the case), hydrogen combustion may yield small amounts of nitrogen oxides, along with the water vapor.

-Answered by Himanshi Verma On 21 April 2019:11:00:47 AM

 Sublimation is the process in which solid is directly converted into gas and gas change into solid.

-Answered by Himanshi Verma On 21 April 2019:11:01:13 AM

 The reaction in which addition of hydrogen or removal of Oxygen is called ruduction.

-Answered by Himanshi Verma On 21 April 2019:11:02:20 AM

 Chemical reaction are five types:

1) Combination reaction

2) Decomposition reaction

3) Displacement reaction

4) Double Displacement reaction

5) Oxidation and reduction.

-Answered by Himanshi Verma On 21 April 2019:11:04:01 AM

 Yes, chemical change also called chemical reaction.

-Answered by Himanshi Verma On 21 April 2019:11:05:42 AM

  A written representation of a chemical reaction, in which the symbols and amounts of the reactants are separated from those of the products by an equal sign, arrow, or a set of opposing arrows. For example, Ca(OH) 2 + H2SO4 = CaSO 4 + 2H2O, is an equation.

-Answered by Himanshi Verma On 21 April 2019:11:06:57 AM

  In certain mixtures the relatively large particles called the dispersed phase are distribution throughout a solvent like medium called dispersing medium. So one particle is an aggregation of several atoms or molecules or ions. These particles and mixture is called a colloids. 

-Answered by Himanshi Verma On 21 April 2019:11:07:35 AM

 No size of colloidal particles are to small to be individually seen by naked eyes.

-Answered by Himanshi Verma On 21 April 2019:10:56:14 AM

 Foam, shaving cream. 

-Answered by Himanshi Verma On 21 April 2019:10:56:25 AM

  Oxygen in water.

-Answered by Himanshi Verma On 21 April 2019:10:56:36 AM

 Particles of true solutions are too small to be visible.

-Answered by Himanshi Verma On 21 April 2019:11:12:03 AM

  Yes ,it makes its path visible. 

-Answered by Himanshi Verma On 21 April 2019:11:12:15 AM

 Coloured gemstone and milky glass are such sols.

-Answered by Himanshi Verma On 21 April 2019:11:12:26 AM

  It is a colloid of liquid in liquid,i.e.,milk, face cream.

-Answered by Himanshi Verma On 21 April 2019:11:12:37 AM

  A colloidal of liquid in solid is called gel. i.e., jelly, cheese,butter.

-Answered by Himanshi Verma On 21 April 2019:11:12:50 AM

 Any homogeneous mixture of two or more substances (solid, liquid or gases) is called solution .In solutions there is a homogeneity at micro level.

-Answered by Himanshi Verma On 21 April 2019:11:13:03 AM

 Materials of smaller particle size, insoluble in a solvent but visible to naked eye, give suspension.

-Answered by Himanshi Verma On 21 April 2019:11:13:20 AM

 They may or may not show Tyndall effect.

-Answered by Himanshi Verma On 21 April 2019:11:13:50 AM

  Matter is made up of small particles if a spoonfull of  salt is dissolved in a glass of water, the level of water does not change. 

-Answered by Himanshi Verma On 21 April 2019:11:13:34 AM

  Blood, milk and gum. etc.

-Answered by Himanshi Verma On 21 April 2019:11:14:03 AM

 Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shovelling, picking, mattock work, hoeing, and raking. ... "Tillage" can also mean the land that istilled.

-Answered by Himanshi Verma On 21 April 2019:11:14:18 AM

 a machine that simultaneously cuts, threshes, and cleans a standing crop of grain

-Answered by Sohail alam On 19 April 2019:02:49:21 PM

 Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

-Answered by Sohail alam On 19 April 2019:03:03:21 PM

 The agricultural implements cover ploughs, threshers, axes, powrahs, chaffcutter machine, cultivators, seed drills, etc. These implements are used for agriculture work to improve the efficiency and reduce the labour. A large variety of agricultural implements are also used as attachments to tractors.

-Answered by Himanshi Verma On 21 April 2019:10:38:14 AM

 “Potable water” simply means water that is safe to drink, and it is becoming scarcer in the world Increasing use is stressing freshwater resources worldwide, and a seemingly endless list of contaminants can turn once potable water into a health hazard or simply make it unacceptable aesthetically.

-Answered by Hitesh kumar On 20 April 2019:08:04:54 AM

 Co₂ gas is most responsible for Global Warming. 

-Answered by Himanshi Verma On 21 April 2019:10:39:02 AM

 Economic water scarcity is caused by a lack of investment in infrastructure or technology to draw water from rivers, aquifers or other water sources, or insufficient human capacity to satisfy the demand for water. One quarter of the world's population is affected by economic water scarcity.

-Answered by Himanshi Verma On 21 April 2019:10:39:14 AM

 Air pollution is defined as the introduction of pollutants, organic molecules, or other unsafe materials into Earth’s atmosphere. This can be in the form of excessive gases like carbon dioxide and other vapours that cannot be effectively removed through natural cycles, such as the carbon cycle or the nitrogen cycle.

-Answered by Himanshi Verma On 21 April 2019:10:39:27 AM

 Chemical waste from factories is sometimes dumped into rivers and lakes, or directly into the ground. Pesticides (chemicals that kill insects) applied to farmland enter surface water and groundwater, often in large quantities. Once a pollutant enters a water supply, it is difficult to get rid of it.

-Answered by Himanshi Verma On 21 April 2019:10:39:38 AM

 Carbon dioxide (CO. ...

Methane (CH. ...

• Nitrous oxide (N. ₂O)
• Ozone (O. ...
• Chlorofluorocarbons (CFCs)
• Hydrofluorocarbons (incl. HCFCs and HFCs)

-Answered by Hitesh kumar On 20 April 2019:10:00:10 AM

  Greenhouse gas, any gas that has the property of absorbing  emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to the green house effect. carbon dioxide and methane and water vapour are the most important greenhouse gases. (To a lesser extent, surface-level  fluorinated gases also trap infrared radiation.) Greenhouse gases have a profound effect on the energy. budget of the Earth system despite making up only a fraction of all atmospheric gases. Concentrations of greenhouse gases have varied substantially during Earth’s history, and these variations have driven substantial climate changes. at a wide range of timescales. In general, greenhouse gas concentrations have been particularly high during warm periods and low during cold periods.

-Answered by Himanshi Verma On 21 April 2019:10:39:54 AM

  Household sources: Gadgets like food mixer, grinder, vacuum cleaner, washing machine and dryer, cooler, air conditioners, can be very noisy and injurious to health. Others include loud speakers of sound systems and TVs, ipods and ear phones.

-Answered by Himanshi Verma On 21 April 2019:10:40:16 AM