Asked/Added Questions From NCERT: Science

 It is a device that produces an intense, coherent and highly directional beam of the single frequency. It can be transmitted over a great distance without being spread. 

The full form of LASER  is Light Amplification by Stimulated Emission of Radiation.

-Answered by Payal Kumari On 19 March 2019:05:44:55 PM

Atmospheric Pressure decreases with altitude that is why:-

1) It is difficult to cook on the motion. 

2) The fountain pen of a passenger leaks in aeroplane. 

3) Bleeding occurs from the nose.

4) It is difficult to breath on higher altitude due to less amount partial pressure of oxygen in air.

5) Water starts to boil below 100°C .

° 

-Answered by Himanshi Verma On 19 March 2019:05:34:25 PM

The day was May 18 in the year 1974. On this day, the Indian government conducted its first nuclear test in the deserts of Pokhran, Rajasthan making it a peaceful nuclear explosion. 'Smiling Buddha' (MEA designation: Pokhran-I) was the assigned code name of India's first successful nuclear bomb test.

-Answered by Himanshi Verma On 19 March 2019:05:17:06 PM

 हमारे शरीर में होने वाली जैव रासायनिक क्रियाओं की पीएच परास 7 से लेकर 7.8 तक ही होती है। इसमें थोड़ा भी परिवर्तन हमारे शरीर पर बहुत घातक प्रभाव डालता है।

-Answered by Himanshi Verma On 09 March 2019:05:27:06 PM

 A filament is made up of a substance having high melting point(like tungsten) because A buld lights up by heating the filament. The heated filament is the source of light,and if the melting point of filament's substance is low,it may melt.

-Answered by Himanshi Verma On 09 March 2019:04:52:56 PM

 Residual volume is the amount of gas remaining in the lungs at the end of a maximal exhalation. Residual Volume is important because it prevents the lungsfrom collapsing. Even after we have expelled as much air as possible (expiratory reserve volume) gaseous exchange is still occurring by residual volume in thelungs.

-Answered by Payal kumari On 09 March 2019:04:46:24 PM

-Answered by Himanshi Verma On 10 March 2019:04:42:57 PM

-Answered by Himanshi Verma On 10 March 2019:04:43:59 PM

  Yenam

-Answered by Himanshi Verma On 10 March 2019:04:41:24 PM

 घेंघा (Goiter) एक रोग है जिसमे गला फूल जाता है। यह शरीर में आयोडीन  के की कमी के कारण होता है। आयोडीन की कमी के कारण थयेरिएद ग्रंथि  में सूजन आ जाती है। यह रोग बहुधा उन क्षेत्रों के लोगों को होता है जहाँ पानी में आयोडीन नहीं होता। आयोडीन की कमी की पूर्ति के लिये प्राय: आयोडीनयुक्त नमक  का उपयोग करने की सलाह दी जाती है।

-Answered by Himanshi Verma On 10 March 2019:04:45:23 PM

 हीराकुंड बांध 

-Answered by Himanshi Verma On 10 March 2019:04:47:15 PM

 अग्नाश्ये 

-Answered by Himanshi Verma On 10 March 2019:04:47:33 PM

-Answered by Himanshi Verma On 09 March 2019:01:26:04 PM

 This is because colloids have suspension of small particles, from 1 – 1000 nanometres in size which can scatter light falling on them, a phenomenon called asTyndall effect. In the above question, only b) milk and d) starch solution show Tyndall effect as they are colloids

-Answered by Himanshi Verma On 08 March 2019:05:18:28 PM

 In 1917

-Answered by Himanshi Verma On 04 March 2019:02:50:47 PM

 Two elements are X  with atomic number 11 ---- Sodium

Y with atomic number 13--- Aluminium.

1. Which among-st  the two has less metallic character?

      Y has less metallic character because metallic character decreases in a period from left to right.

2. .Calculate the valency of each element.

Element X --- electronic configuration : 1s22s22p63s1

so valency is one.

Element Y electronic configuration : 1s22s22p63s23p3

Velency is three.

3 "Element ‘X’ is bigger than ‘Y’ in terms of atomic size. Is the statement true, justify? "

Its true . Because atomic size decreases over period due to increase in nuclear Charge.

-Answered by Shalu Shukla On 01 March 2019:03:46:36 PM

 We can use it by making polybags recycle and either recycling it we can use paper polybags. If someone gives u something in plastic bags offer him not to do so.

-Answered by Himanshi Verma On 01 March 2019:03:43:16 PM

 Mitochondria

-Answered by Himanshi Verma On 02 March 2019:07:29:26 AM

-Answered by Himanshi Verma On 01 March 2019:03:44:00 PM

 100 degre celcius

-Answered by Jyoti Srivastva On 01 March 2019:03:56:00 PM

 World Health Organisation.

-Answered by Himanshi Verma On 24 February 2019:05:03:45 PM

 Robert Hook in 1665.

-Answered by Himanshi Verma On 24 February 2019:05:04:19 PM

 Echidna

-Answered by Himanshi Verma On 24 February 2019:05:04:53 PM

 The law of conservation of energy states that energy can neither be created nor be destroyed, but it can be transformed from one form to another. So I considered an example of it as follows: water is stored at height with potential energy, the water flows and its potential energy is converted into kinetic energy.

-Answered by Himanshi Verma On 16 February 2019:05:30:10 PM

 Charles Darwin

-Answered by Himanshi Verma On 24 February 2019:04:55:39 PM

Longitudes Waves:- In this wave, the particles of the medium vibrate in the direction of propagation of wave. Waves on spring or sound waves in air are examples of longitudinal waves.                                Transverse waves:- In this wave, the particles of the medium vibrate perpendicular to the direction of propagation of wave. Waves on strings under tension, waves on the surface of water are examples of transverse Waves.

-Answered by Himanshi Verma On 11 February 2019:07:59:17 PM

Carbon dioxide, carbon monoxide, Plaster of Paris, Portland Cement, Soaps, Glass, pesticides, Heavy water, hard water, hardening of oil, Medicines

-Answered by Himanshi Verma On 11 February 2019:07:56:33 PM

 Robert Kock (1883) in Germany.

-Answered by Himanshi Verma On 11 February 2019:07:55:07 PM

 ATP stands for Adenosine Triphosphate . This is the energy currency of most cellular processes . The energy released during the process of respiraton is used to make an ATP molecule from ADP (Adenosine Diphosphate) and inorganic phosphate.

-Answered by Himanshi Verma On 13 February 2019:05:32:16 PM

 Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. Powdered borax is white, consisting of soft colorless crystals that dissolve easily in water. Borax has a wide variety of uses.

-Answered by Himanshi Verma On 11 February 2019:05:42:09 PM

 The number of elements discovered has increased, making it difficult to remember the behavior and properties of these elements. Hence it is important to classify elements according to their properties. ... It helps us understand how different elements form different compounds.

-Answered by Himanshi Verma On 11 February 2019:05:42:36 PM

 Eggs shell is made up of calcium carbonate, when it reacts with nitric acid it gives calcium nitrate, carbon dioxide and water the reaction is as follow;

CaCO₃ + HNO₃ → Ca(NO₃)₂ + CO₂ + H₂O 

-Answered by Himanshi Verma On 09 February 2019:04:17:50 PM

 Male reproductive part is called Stemen which composed with Anther and pollen grains. 

-Answered by Himanshi Verma On 09 February 2019:04:18:10 PM

 When two parents are involved in reproduction, the method is calledsexual reproduction. The male and female gametes fuse during fertilization toproduce zygote. The zygote subsequently develops into an embryo which further develops into a new individual.

-Answered by Himanshi Verma On 09 February 2019:04:20:30 PM

 Sexual reproduction is a process which involves production of seeds. It requires two parents. Most plants reproduce sexually with the help of flowers. ... Question 4: State the main difference between asexual and sexual reproduction.

-Answered by Himanshi Verma On 09 February 2019:04:20:58 PM

 The similarities between aerobic and anaerobic respiration, is that they both use glucose as the starting molecule. This is called the substrate. In addition, bothaerobic and anaerobic respiration produce ATP, however, aerobic respiration produces a lot more ATP compared to anaerobic respiration.

-Answered by Himanshi Verma On 09 February 2019:04:21:25 PM

 ➧ Potential energy = mgh

➧ m = 4kg

➧ g = 10 m/s²

➧ Initial potential energy

➾ m g 5

➧ Final potential energy

➾ m g 10

➧ Change =

Final potential energy - Initial Potential 

Energy

➾ mg 10 - mg 5

➾ mg (10 -5)

➾ 5 x m x g

➾ 5 x 4 x 10

➾ 200 J 

-Answered by Shalu Shukla On 11 February 2019:05:52:18 PM

  When baking soda is mixed with lemon juice, bubbles formed because of evolution of carbon dioxide gas. This is a chemical change, because in this reaction new substances are formed. Question 5: When a candle burns, both physical and chemical changes take place.

-Answered by Himanshi Verma On 03 February 2019:04:03:50 PM

 Sun is the big source of energy

-Answered by Nishant Verma On 03 February 2019:10:17:36 AM

 A concave mirror, or converging mirror, has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point.They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror

-Answered by Himanshi Verma On 02 February 2019:01:23:17 PM

 If the reflecting surface of a spherical mirror is called a con cave mirror 

-Answered by Himanshi Verma On 02 February 2019:01:22:55 PM

 The image formed by a place mirror could  not obtained on a screen such as image is    called avirtual image 

-Answered by Himanshi Verma On 02 February 2019:01:31:56 PM

 A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.

-Answered by Himanshi Verma On 02 February 2019:01:32:33 PM

 Turmeric is yellow in colour. When a base is added to it, the solutionturns into pink colour. However turmeric remains yellow when an acid or neutralsolution is added to it.

-Answered by Himanshi Verma On 02 February 2019:01:32:49 PM

 The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation  [UVR] from the sun, protecting life on Earth from its potentially harmful effects. ... That is,the lower the ozone levels, the higher the solar  [UVR.] 

-Answered by Himanshi Verma On 02 February 2019:01:33:23 PM

 A transparent material with three rectangular surfaces used for obtaining spectrum of light

-Answered by Himanshi Verma On 02 February 2019:01:33:40 PM

 The litmus solution is obtained from lichen. It is used to check acid and base.

-Answered by Himanshi Verma On 02 February 2019:01:34:35 PM

 Water cycle, also called hydrologic cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many processes involved in the water cycle, the most importantare evaporation, transpiration, condensation, precipitation, and runoff.

-Answered by Himanshi Verma On 02 February 2019:01:35:37 PM

 When this contaminated water is used for drinking, it can cause diseases such as cholera, typhoid, hepatitis, dysentery, etc., which may even lead to death. Question 7: Name two chemicals used to disinfect water. Answer: Two chemicals used to disinfect water are chlorine and ozone. 

-Answered by Himanshi Verma On 02 February 2019:01:35:51 PM

 The image formed by a concave lens is always virtual, upright and erect. Question 4: State the characteristics of the image formed by a plane mirror. Answer: The image formed by a plane mirror is erect, laterally inverted, and of the same size as that of the object.

-Answered by Himanshi Verma On 02 February 2019:01:36:08 PM

 The difference between uniform and non-uniform motion can be drawn clearly on the following grounds: When an object moves along a straight linewith a firm speed, the motion is said to be uniform motion. ... The object in a uniform motion covers same distances in an equal time period.

-Answered by Himanshi Verma On 02 February 2019:01:37:10 PM

 Convex lens: Thick at middle thin at edges. Can form real image.

Concave lens: Thin at middle thick at edges. Can form virtual image

-Answered by Himanshi Verma On 02 February 2019:01:37:24 PM

  25 km

-Answered by Himanshi Verma On 02 February 2019:01:37:35 PM

 Water is known to exist in three different states; as a solid, liquid or gas. Clouds, snow, and rain are all made of up of some form of water.

-Answered by Himanshi Verma On 02 February 2019:01:39:18 PM

 Distance=240km

Time=4h

speed= distance÷time

        =240÷4

        =60km/h

-Answered by Himanshi Verma On 02 February 2019:01:39:45 PM

 Sea Slug.

-Answered by Himanshi Verma On 03 February 2019:04:20:21 PM

 Francium is the high reactive metal.

-Answered by Himanshi Verma On 02 February 2019:01:42:40 PM

3,422 °C  

-Answered by Himanshi Verma On 02 February 2019:01:42:58 PM

 Atomic number is 19 and valency is 1

-Answered by Himanshi Verma On 02 February 2019:01:44:01 PM

 Ca(ClO)2

-Answered by Nitish kumar On 27 January 2019:03:13:16 PM

 The most important hormone that the pancreas produces is insulin. Insulin is released by the 'beta cells' in the islets of Langerhans in response to food. Its role is to lower glucose levels in the bloodstream and promote the storage of glucose in fat, muscle, liver and other body tissues.

-Answered by Himanshi Verma On 02 February 2019:01:47:15 PM

 The lens is located in the eye. By changing its shape, the lens changes the focal distance of the eye. In other words, it focuses the light rays that pass through it (and onto the retina) in order to create clear images of objects that are positioned at various distances.

-Answered by Himanshi Verma On 02 February 2019:01:47:42 PM

 Endothermic reaction examples equations

-Answered by Himanshi Verma On 02 February 2019:01:48:05 PM

 Edward Jenner

-Answered by Himanshi Verma On 03 February 2019:04:28:16 PM

  Carolous linneas

-Answered by Himanshi Verma On 24 January 2019:05:01:03 PM

 The first successful vaccine to be developed, was introduced by Edward Jenner in 1796. He followed up his observation that milkmaids who had previously caught cowpox did not later catch smallpox by showing that inoculated cowpox protected against inoculated smallpox.

-Answered by Himanshi Verma On 24 January 2019:05:13:05 PM

 IR-36 is improved variety of rice.

-Answered by Himanshi Verma On 03 February 2019:04:28:59 PM

 Chluro fluro carbons (CFCs) responsible for ozone depletion.

-Answered by Himanshi Verma On 25 January 2019:05:08:34 PM

 Gonorrhea is a sexually transmitted disease (STD). You get it from having sex with someone who is infected with it. Some people call it “the clap.” Gonorrheausually causes pain and other symptoms in your genital tract, but it can also causeproblems in your rectum, throat, eyes, or joints.

-Answered by Himanshi Verma On 24 January 2019:05:01:51 PM

 Cutaneous respiration is a form of respiration in which gas exchange occurs across the skin rather than the lungs or gills. They occur in many organisms like insects, amphibians, fish, sea snakes, turtles and few mammals too.

-Answered by Himanshi Verma On 24 January 2019:05:02:53 PM

 4-d chemical is ussualy used as a weedicide. 

-Answered by Himanshi Verma On 26 January 2019:12:28:56 AM

  Bacteria organism the eukarytic cell is found without plastid 

-Answered by Akki chauhan On 01 March 2019:01:00:07 PM

 Echidna  

-Answered by Himanshi Verma On 24 January 2019:04:58:51 PM

 Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens(chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).

-Answered by Himanshi Verma On 24 January 2019:05:03:53 PM

 The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. The system is composed of canals connecting numerous tube feet.

-Answered by Himanshi Verma On 24 January 2019:05:05:09 PM

 Violent, Indigo, Blue, Green, Yellow, Orange, Red.

-Answered by Himanshi Verma On 03 February 2019:04:39:53 PM

 Diamond is the hardest naturally occurring substance found on Earth. But it is not the hardest substance. Wurtzite boron nitride (synthetic) and lonsdaleite (which comes from meteorites) are both harder.

-Answered by Himanshi Verma On 21 January 2019:05:25:34 PM

 Vaccine is discovered by Edward Jenner

-Answered by Akki chauhan On 21 January 2019:09:17:20 AM

 संगठन (organisation) वह सामाजिक व्यवस्था या युक्ति है जिसका लक्ष्य एक होता है, जो अपने कार्यों की समीक्षा करते हुए स्वयं का नियन्त्रण करती है, तथा अपने पर्यावरण से जिसकी अलग सीमा होती है। संगठन तरह-तरह के हो सकते हैं - सामाजिक, राजनैतिक, आर्थिक, सैनिक, व्यावसायिक, वैज्ञानिक आदि।

परिचय

जब दो या दो से अधिक व्यक्ति मिलकर किसी एक उद्देश्य की प्राप्ति के लिए कार्यशील होते हैं तो संगठन की आवश्यकता पड़ती है। उद्देश्य के अल्पकालीन होने से संगठन की आवश्यकता में कमी नहीं आती। यदि कुछ व्यक्तियों को मिलकर भारी वजन उठाना हो तो इस क्षणिक उद्देश्य की पूर्ति के लिए संगठन की आवश्यकता होती है। किसी भी व्यावसायिक उपक्रम के लिए व्यवसाय प्रारंभ करने के पूर्व से उसको संचालित करने के लिए संगठन का निर्माण कर लिया जाना चाहिए। बगैर संगठन के किसी भी उद्देश्य की प्रभावपूर्ण ढंग से पूर्ति संभव नहीं है। एक अच्छा संगठन किसी निष्क्रिय उपक्रम को भी जीवन प्रदान कर सकता है। एक कमजोर संगठन अच्छे उत्पाद को मिट्टी में मिला सकता है जबकि एक अच्छा संगठन जिसके पास कमजोर उत्पाद है, अपने से अच्छे उत्पाद को बाजार से निकाल सकता है। 

-Answered by Himanshi Verma On 10 March 2019:04:51:49 PM

 किसी भी चीज़ की रचना को क्रिस्टी कहते है |

-Answered by Himanshi Verma On 20 January 2019:04:42:08 PM

 Sunday 7 april.

-Answered by Himanshi Verma On 20 January 2019:04:14:37 PM

 World Health Organisation.

-Answered by Himanshi Verma On 20 January 2019:04:17:51 PM

 Actually, zero is neither a negative or a positive number. The whole idea ofpositive and negative is defined in terms of zero. Negative numbers are numbers that are smaller than zero, and positive numbers are numbers that are bigger thanzero. 

-Answered by Himanshi Verma On 20 January 2019:04:18:58 PM

 जब उर्जा का एक रूप उर्जा के दुसरे रूप में रूपांतरित होता है तब कुल उर्जा की मात्रा अचार रहती है 

1.उर्जा की न तो उत्पती हो सकती हल और न ही विनाश 

2.बल्कि उर्जा रूपांतर के दौरान कुछ उर्जा बेकार हो जाती है लेकिन निकाय की कुल उर्जा आवर्तित रहती है|

-Answered by Himanshi Verma On 20 January 2019:04:19:28 PM

 1000 joules

-Answered by Himanshi Verma On 20 January 2019:04:22:17 PM

 Plant cells: Plastids: As previously mentioned, plastids are doubled membraned 'sac-like' organelles, generally involved in either the manufacture or storage of food. They include chloroplasts, chromoplasts and leucoplasts.

-Answered by Himanshi Verma On 20 January 2019:04:20:28 PM

  Watt = 1500(w)

 Taken time = 10 hours 

 power of an electric heated is = 

 = 15001000 = 1.5kw 

 t = 10 hours 

 Energy = power × Taken time 

            = 1.5 kw × 10 h 

            = 15kwh

-Answered by Himanshi Verma On 20 January 2019:04:22:55 PM

 Five electric fans of watt = 120×5

                                    = 600(W) 

taken time = 4 hours

power of fans = 600(W)=

                                   = 6001000 kw

                                   =0.6kw 

energy = power × taken time 

           = 0.6kw × 4h 

           = 2.4kwh.

-Answered by Himanshi Verma On 20 January 2019:04:23:20 PM

 De- oxygenated blood

-Answered by Himanshi Verma On 20 January 2019:04:26:41 PM

 A hypertonic solution means that there is more salt in the solution or external environment than within the red blood cells. When red blood cells are placed in a hypertonic solution, water within the cells move out via osmosis into thesurrounding solution, causing the red blood cells to shrink and shrivel.

-Answered by Himanshi Verma On 20 January 2019:04:27:07 PM

 Since, the ration by which oxygen and hydrogen combine to give water is 1:8.

We can take it as "1g of hydrogen combines with 8g oxygen to give water''

So, 3g of hydrogen will combine with 3×8=24g of oxygen to give water.

-Answered by Himanshi Verma On 20 January 2019:04:29:23 PM

 The number of atom present in one molecule of an element is called Atomicity.

-Answered by Himanshi Verma On 20 January 2019:04:29:11 PM

 The interconversion of state of matter is considered as a physical change:-

1. No formation of new compound 

2. Formula of the element /compound remain same 

3. No colour and odour change is seen

-Answered by Himanshi Verma On 19 January 2019:04:21:47 PM

 The interconversion of the states of matter is a physical change due to the following reasons: The change is reversible. A substance can revert back to its original state by physical means. ... Ice, water and water vapour are chemically H₂O although they are present as solid, liquid and gaseous states respectively.

-Answered by Himanshi Verma On 03 February 2019:04:44:45 PM

  Three reasons to justify that inter conversion of states of matter is considered as physical change : 

• No formation of new compound.

• Formula of the element/compound remains same 

• No colour or odour change is seen.

-Answered by Himanshi Verma On 19 January 2019:04:22:23 PM

 The interconversion of the states of matter is a physical change due to the following reasons: The change is reversible. A substance can revert back to its original state by physical means. ... Ice, water and water vapour are chemically H₂O although they are present as solid, liquid and gaseous states respectively.

-Answered by Himanshi Verma On 10 March 2019:04:52:43 PM

 The interconversion of the states of matter is a physical change due to the following reasons: The change is reversible. A substance can revert back to its original state by physical means. ... Ice, water and water vapour are chemically H₂O although they are present as solid, liquid and gaseous states respectively.

-Answered by Himanshi Verma On 03 February 2019:04:45:04 PM

 1. पधार्थ के कण निरंतर गतिशील रहते है |

2. पदार्थ के कणों के बीच रिक्तस्थान होता है |

3. पधार्थ के कण एक दुसरे को आकर्षित करते है |

-Answered by Himanshi Verma On 18 January 2019:05:27:42 PM

  Liquid metal consists of alloys with very low melting points which form a eutectic that is liquid at room temperature. The standard metal used to be mercury, but gallium-based alloys, which are lower both in their vapor pressure at room temperature and toxicity, are being used as a replacement in various applications.

-Answered by Himanshi Verma On 17 January 2019:05:24:18 PM

 The subtances which undergo sublimation on heating is napthelene and camphor.

-Answered by praful kumar On 20 January 2019:10:07:53 AM

  Kerogen is a mixture of organic chemical compounds that make up a portion of the organic matter in sedimentary rocks. ... Shales rich inkerogens that have not been heated to a warmer temperature to release their hydrocarbons may formoil shale deposits.

-Answered by Himanshi Verma On 19 January 2019:10:07:10 AM

 (a) Not true, because if the initial and final position of the object is the same displacement can become zero.

-Answered by Himanshi Verma On 20 January 2019:05:21:27 PM

 The man takes 40 sec to cover ( 4 * 10 ) 40 metres. This shows he covers one metre in one sec.

In 2 min 20 sec (140 sec) , he will cover a distance of  140 metres.

Thus he completes  14040 = 3.5 rounds in 2 min 20 sec.

Hence it is noticed that he will be at the opposite side from where he started.

Now considering two simple cases.

Case (i)

If the man started at a corner of the square street:

In this case, the man would be diagonally opposite to the place from where he started

Displacement = diagonal of square with side 10 metre.

=   102+102−−−−−−−−√

=   100−−−√

=14.1m

Case (ii)

The man started from the middle of the road.

After the end time, he is in the opposite side of the road.

Hence, the displacement is 10 metre.

-Answered by Himanshi Verma On 19 January 2019:04:25:08 PM

  If the plasma membrane ruptures or breakdown then the cell will not be able to exchange material from its surrounding by diffusion or osmosis. Thereafter the protoplasmic material will be disappeared and the cell will die

-Answered by Himanshi Verma On 16 January 2019:05:14:33 PM

 CO2 moves by diffusion and H2O  move by osmosis through cell membrane.

-Answered by Himanshi Verma On 19 January 2019:04:25:30 PM

 a) more than one b) less than one c) equal to one d) zero

-Answered by Himanshi Verma On 20 January 2019:05:18:11 PM

 First increase than decrease

-Answered by Himanshi Verma On 16 January 2019:05:23:43 PM

 Magnesium

-Answered by Himanshi Verma On 16 January 2019:06:03:03 PM

 An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.

-Answered by Himanshi Verma On 19 January 2019:04:34:25 PM

 Joseph john thomson.

-Answered by Prince Rawat On 15 January 2019:10:20:32 AM

   78+273=351 kelvin

-Answered by Akki chauhan On 16 January 2019:10:12:56 AM

   1) scientific name of tiger is panthera tigris and scientific name of lizard is lacertilia. 2) ostrich is multicellular organism.

-Answered by Akki chauhan On 16 January 2019:10:12:35 AM

  NaHCO₃

-Answered by Akki chauhan On 15 January 2019:09:50:05 AM

 Given:  Tortoise moves 100 meters in 15 minutes.

Therefore, Average Speed = 100 meters /15 minutes  

(as Speed = Distance/time)

                                                    = 0.10 Km/ 0.25 hours

 (as 1 Km

= 1000 m and 1 hour = 60 min)

                                                     = 0.4 Km/hour

Answer – The average speed of tortoise is 0.4 Km/hour

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-Answered by Himanshi Verma On 20 January 2019:05:13:43 PM

 The atomicity of iodine is Diatomic. 

-Answered by Akki chauhan On 14 January 2019:09:06:14 AM

   In Steel sound travel fastest.

-Answered by Akki chauhan On 14 January 2019:09:06:39 AM

   1). It is used to detect cracks in metal block in Industries without damaging them.

2). It is used in industries to clean "hard to reach" part of objects such as spiral tubes, odd shaped machine etc.

3). It is used to investigate the internal organs of human body such as liver, gall bladder, kidney, uterus and heart.

-Answered by Himanshi Verma On 16 January 2019:05:15:29 PM

  Mass = 50kg ,   height= 25m  

work done = mg×h

                =50×10×25

                =12500 joule

Time= 10min

change into sec = 10×60

                      =600 sec

power of the machine= work done Time 

                               = 12500600 = 2.08333 watt

-Answered by Akki chauhan On 15 January 2019:09:48:56 AM

 The following two laws of reflection of light are applicable to sound waves as well :-

1. The incident ray, the normal ray to reflecting surface and the reflected ray at the point of incidence ray lie in the same plane. 

2. The angle of incidence ∠i equal to the angle of reflection ∠r. 

-Answered by Shalu Shukla On 16 January 2019:05:52:45 PM

 The full form of AIDS is "Acquired Immune deficiency System".

-Answered by Akki chauhan On 14 January 2019:10:02:47 AM

The series of processes by which nitrogen and its compounds are inter converted in the environment and in living organisms, including nitrogen fixation and decomposition.

-Answered by Rohit Rajput On 13 January 2019:10:25:37 AM

 Kinetic energy : The energy possessed by an object due to its state of motion is called Kinetic energy

The S.I unit is Joule.

Potential energy : The energy of body due to its position or change in shape is known as potential energy.

The S.I unit is Joule.

-Answered by Akki chauhan On 13 January 2019:11:28:46 AM

  Mass:-

1. We can measure of an object by its inertia. 

2. The total quantity of matter contained in an object is called mass of an object.

3. Mass of the object remains constant at all the places.

4. Measurement of mass is done by using a pan or beam balance.

5.Mass of a body cannot change even value of g is zero at any place.

Weight:-

1. Weight=mass ×acceleration 

2. The gravitational force by which earth attracts an object is called weight of the object.

3. Weight of the object is different at all different places.

4. Measurement of weight is done by using a spring balance. 

5. Weight of the object becomes zero if g is zero. 

-Answered by Akki chauhan On 14 January 2019:10:02:25 AM

-Answered by Himanshi Verma On 14 January 2019:05:54:06 PM

 Gravitational Constant (G) :-

1. Its value is 6.6734×10^-11 Nm²/Kg².

2. Its value remains constant always and everywhere.

3. Its S.I unit is Nm²/kg².

4. It is Scaler Quantity. 

 Gravitational acceleration (g):-

1. Its value is 9.8 m/s².

2. Its value varies at different Places. 

3. Its unit is m/s².

4. It is a vector Quantity.

-Answered by Akki chauhan On 15 January 2019:09:47:38 AM

   Infectious Disease :-

1. The disease which spread due to infection by microbes are called infectious. 

2. These could be cause due to pathogens like virus, bacteria. 

3. For Ex- Bacteria, Fungi Protozoa etc. 

Non-Infectious Disease :-

1. The disease which does not spread by contact between infected and healthy person through air water is called non infectious disease. 

2. These could be cause due to deficiency cancer, or injuries etc.

3. For ex- Heart Disease, Artritis. 

-Answered by Akki chauhan On 15 January 2019:09:46:41 AM

 Communicable diseases are the diseases which passes from one individual to another individual. They are generally caused by some bacteria, viruses or any other pathogens. For example, malaria, AIDS etc. Non-communicable diseases are the diseases which does not spread from one person to another person. They are generally caused by some nutrient deficiency, allergy etc. Communicable diseases are inheritable compared to non-communicable diseases which can be heritable also. Communicable diseases can be treated by some conventional methods whereas non-communicale diseases needs special treatments. 

-Answered by Akki chauhan On 28 January 2019:10:24:13 AM

 You should know that the mechanical waves are those waves which require a medium for propagation. Sound needs a medium (solids, liquid, or gas) for their propagation and cann't travel without a medium. Therefore, sound wave is a mechanical wave. 

-Answered by Akki chauhan On 15 January 2019:09:46:22 AM

  Mass number is the sum of neutrons and protons. For example no. of protons in hydrogen is 1 and no. of neutrons is 0. So, 0+1=1, the mass of hydrogen is 1.

-Answered by Akki chauhan On 14 January 2019:09:59:13 AM

   Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus with a very small contribution from the orbiting electrons. Neutrons have no charge and protons are positively charged. Because the nucleus is only made up of protons and neutrons it is positively charged.

-Answered by Akki chauhan On 15 January 2019:09:46:08 AM

  An atom according to its atomic number  arranges the electrons in the shells and when all electrons  are arranged then the electron (valence electrons) in the valence shell loses or gains electrons to complete octet and by doing so it gains negative or positive valency.

-Answered by Akki chauhan On 15 January 2019:09:45:48 AM

  Electron=A Electron is a subatomic particle. Electrons have a negative electric charge. It is discovered by J.J Thomson.

Proton= Proton is also a Subatomic Particle which symbol is p with a positive charge. It is discovered by E.Rutherford. 

Neutrons= Neutron is also a subatomic particle which symbol is n with no electric charge and a mass slightly larger than that of proton. 

-Answered by Akki chauhan On 15 January 2019:09:45:31 AM

 Drawbacks of Rutherford’s model of atom

• Rutherford proposed that electrons revolve at a high speed in circular orbits around the positively charged nucleus. When a charged particle i. e. electron revolves around positively charge nucleus, it needs to be accelerated so as to keep it moving in circular orbits. However, according to electromagnetic theory, whenever a charged particle such as an electron is accelerated around another charged center ( nucleus ) which are under force of attraction, there will be continuous radiation of energy. This loss of energy would slow down the speed of the electron. This would reduce the radius of the electron–orbit. Eventually the electron would fall into the nucleus. The result would be that the atom would collapse. But this does not happen. Thus Rutherford’s atom could not explain the stability of the atom. Failure of Rutherford’s model i.e. reduction of radius of orbit is shown below.
• Rutherford proposed that electrons revolve around the nucleus in the fixed orbits. However, he did not specify the orbits and the number of electrons in each orbit.

-Answered by Himanshi Verma On 02 February 2019:01:52:05 PM

 The tissue which is responsible for movement in our body is Muscular Tissue.

-Answered by Akki chauhan On 14 January 2019:09:57:12 AM

  Bricks are assembled to make a building. Similarly Cells are assembled to make our body of every organism. The brick is unit part of the building. Thus, Cells make tissue together the body so, we can say that cells are the basic structural unit of life of organism. 

-Answered by Akki chauhan On 15 January 2019:08:41:19 AM

  The number of electrons lost or gained by an element in achieving 8 electrons in its outermost shell will be called its valency. The valency of silicon is 4 and oxygen is 2.

-Answered by Akki chauhan On 14 January 2019:09:56:30 AM

  It is not possible to see an atom with naked eyes because all matter are made up very tiny particles called atom. And atom is undivisible particle which can not be divide by or hand.

-Answered by Akki chauhan On 14 January 2019:09:56:03 AM

  Mixtures are constituted by more than one kind of pure form of matter,known as a substance.

-Answered by Akki chauhan On 16 January 2019:10:11:56 AM

  He has work done work because a coolie carries luggage along a long platform and there is displacement so, here  work is done.

-Answered by Akki chauhan On 14 January 2019:09:55:33 AM

 Four times of its initial value of kinetic energy.

-Answered by Rohit Rajput On 12 January 2019:10:37:14 AM

 The four forms of energy are as follows:-

1. Kinetic Energy                       2. Potential Energy 

3. Light Energy                          4. Electrical Energy 

and, 5. Solar Energy  

-Answered by Akki chauhan On 14 January 2019:09:55:11 AM

  Himanshi Verma

 The relation between kilowatt hour and and joule is 

1KWH =3600000 Joule

and   1KWH=3.6Mj (Mega Joule )

                                     OR

We Know that KWH is a commercial unit 1KWH=1KW*1H

    1000W*1H 

    1Watt*sec =1Joule 

    1KWH=3600000 joule

-Answered by Akki chauhan On 14 January 2019:09:54:46 AM

  Work is said to be negative if force is acting opposite to the displacement. 

Examples= 1. Work done by a man while descending through   a staircase is negative. Man applies a force in vertically upward direction to balance his weight but displacement is in downward direction and work is negative.

2. Work done by force of friction on moving vehicles is negative. 

-Answered by Akki chauhan On 15 January 2019:08:40:30 AM

Example: (i) A person climbing upward on a ladder (or staircase) does positive work against the force of gravity.

(ii) work done by horse while pulling a cart is positive work against the force of friction.  

-Answered by Rohit Rajput On 12 January 2019:10:30:14 AM

 The conditions for work done can be zero are as follows

1. There is no net force applied to the object.

2. Force is being applied but it does not cause any displacement.

-Answered by Akki chauhan On 14 January 2019:09:53:57 AM

 The potential energy to raise the water 

 =  mass of water (500kg, 1 liter of water is 1 kg) x gravitational pull(10m/s) x height (40m)

   500kg x 10m/s x 40m= 200000 joules (work, potential energy)

.Power = work / time

Therefore time = work 200000joules/power 1kw= 1000joules/s)

             time =  200000joules/1000joulse/s

                     = 200000/1000 s

                     = 200 s

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-Answered by Himanshi Verma On 16 January 2019:05:59:15 PM

 Energy : The capacity of doing work is known as energy . its S.I unit is joule.

Work :

-Answered by Akki chauhan On 12 January 2019:10:17:03 AM

 The mammal give egg and milk is  Duck billed platypus.

-Answered by Akki chauhan On 11 January 2019:09:19:56 AM

 Junglefowl

-Answered by Rohit Rajput On 11 January 2019:08:43:53 AM

 The full form of STD is sexually transmitted diseases.

-Answered by Akki chauhan On 11 January 2019:09:11:24 AM

 The branch of science that classify living organisms among different categories or group is called the taxonomy. It is the science of identifying and naming species into system of classification.

-Answered by Akki chauhan On 10 January 2019:10:48:10 AM

 The law of gravitation states that the force of attraction between any two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them. The law applies to objects anywhere in the universe. Such a law is said to be universal.

-Answered by Akki chauhan On 10 January 2019:10:50:58 AM

   The group of living organisms is Protista kingdom which have the cilia and flagella like structure for the moving around.

-Answered by Akki chauhan On 11 January 2019:09:06:19 AM

  The organisms which are out side of the classification are virus and prions.

-Answered by Rohit Rajput On 11 January 2019:08:45:05 AM

 serpentes

-Answered by Rohit Rajput On 11 January 2019:08:33:31 AM

 Carolus Linnaeus

-Answered by Akki chauhan On 10 January 2019:10:52:50 AM

 Leucoplasts lack pigments and so they are not green. They are located in roots and non-photosynthetic tissues of plants. They can become specialized for bulk storage of starch, lipid or protein and are then known as amyloplasts, elaioplasts, or proteinoplasts, respectively.

-Answered by Himanshi Verma On 02 February 2019:01:53:02 PM

 Aves: (i) These are warm blooded animals.

          (ii) They have four-chambered heart.

          (iii) They lay eggs.

          (iv) They Breathe through lungs.

Mammals: (i) Mammals are warm blooded animals.

                  (ii) They have four-chambered heart.

                  (iii) Most mammals familiar to us produce live young ones.

                  (iv) A few of them, like the platypus and the echidna lay eggs.

-Answered by Rohit Rajput On 12 January 2019:09:59:33 AM

 The planet cut the axis of the earth is Thia.

-Answered by Akki chauhan On 10 January 2019:09:52:55 AM

 The joule's law of heating implies that heat produced in a resistor is

(i) directly proportional to the square of current for a given resistance, 

(ii) directly proportional to resistance for a given current, and 

(iii) directly proportional to the time for which the current flows through the resistor.

This law is known as joule's law of heating.

-Answered by Akki chauhan On 10 January 2019:10:55:38 AM

    Negative acceleration is called retardation.

-Answered by Akki chauhan On 10 January 2019:10:56:09 AM

 S.I unit is joule.

-Answered by Akki chauhan On 10 January 2019:10:56:31 AM

 When two or more are grown in the same field in definite pattern is called inter- cropping.

-Answered by Akki chauhan On 10 January 2019:10:44:57 AM

-Answered by Jyoti Srivastva On 30 January 2019:04:39:24 PM

 Three characteristics of colloids are -

(i) They do not settle down when left undisturbed, that is, a colloid is quite stable.

(ii) They show tyndall effects. 

(ii) Colloidal particles can not be seperated by the process of filteration. 

-Answered by Akki chauhan On 10 January 2019:10:58:39 AM

 The process in which solids convert directly into gases and gases convert into solid is called sublimation.

-Answered by Akki chauhan On 14 January 2019:09:52:57 AM

 All acids have H+ ions. H+ ion is a chemical properties of acid. 

-Answered by Akki chauhan On 14 January 2019:09:52:42 AM

 Ameter measures the amount of current in a cunductor while galvanometer detects the current.

-Answered by Akki chauhan On 14 January 2019:09:52:22 AM

 प्रायः किसी पदार्थ के घनत्व को पानी के घनत्व की तुलना में व्यक्त करना सुविधजनक होता है।

किसी पदार्थ का आपेक्षिक घनत्व उस पदार्थ का घनत्व व पानी के घनत्व का अनुपात है।

चूँकि आपेक्षिक घनत्व समान राशियों का एक अनुपात है, अतः इसका कोई मात्राक नहीं होता।

-Answered by Akki chauhan On 14 January 2019:09:51:56 AM

 It is a device to detect current in an electric circuit.

-Answered by Akki chauhan On 14 January 2019:09:51:32 AM

 Use of cancave mirror; 

(i)    Concave mirrors are commonly used in torches, search-lights and vehicles headlights to get powerful parallel beams of light.

(ii)    They are often used as shaving mirrors to see a larger image of the face.

(iii)   Concave mirrors are used to see large images of the teeth of patients by the dentists.

(iv)   Large concave mirrors are used to concentrate sunlight to produce  heat in solar furnaces.

-Answered by Akki chauhan On 14 January 2019:09:51:10 AM

 Ernest Rutherford discovered the nucleus of an atom

-Answered by Akki chauhan On 14 January 2019:09:50:50 AM

  Cells perform all basic functions at cell label and also form the basic structure of body, that is why cell is called the structural and functional unit of body. 

-Answered by Akki chauhan On 01 March 2019:01:00:16 PM