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Asked/Added Questions From NCERT: Physics


Question 1. Asked on :22 October 2019:05:39:48 PM

What is spectrum?

-Added by Himanshi Verma Physics » The Human Eye And The Colourful World

Answer:

Rohit Rajput

 The band of seven colours obtained by dispersion of white light is called spectrum.


-Answered by Rohit Rajput On 23 October 2019:10:31:38 AM


Question 2. Asked on :14 October 2019:06:07:24 PM

 first (1st) “Governor general” of india

-Added by Rahul Kumar Physics » Gk

Answer:

Rahul Kumar
Warren Hastings

-Answered by Rahul Kumar On 14 October 2019:06:08:53 PM


Question 3. Asked on :07 October 2019:10:54:51 AM

Will the current flow more easily through  a thick wire or a thin wire of the same material, when connected to the same source? why? 

-Added by Himanshi Verma Physics » Electricity

Answer:

Himanshi Verma

The current flow more easily through a thick wire as compared to thin wire of the same material, when connected to the same source. It is due to the reason that resistance increases with decrease in thickness.

-Answered by Himanshi Verma On 07 October 2019:10:57:13 AM


Question 4. Asked on :07 October 2019:10:40:12 AM

What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

-Added by Himanshi Verma Physics » Electricity

Answer:

Himanshi Verma

Advantages of connecting electrical devices in parallel with the battery are as follows:

1) Voltage across each connecting electrical device is same and device take current as per its resistance.

2) Separate on/off switches can be applied across each device.

3) Total resistance in parallel circuit decreases, hence a great current may be drawn from cell.

4) If one electrical device is damaged, then other devices continue  to work properly.

-Answered by Himanshi Verma On 07 October 2019:10:49:00 AM


Question 5. Asked on :29 August 2019:03:25:08 PM

 The costum of johar prevailed among the woman of 

-Added by Nishant Verma Physics » Gk

Answer:

Rohit Rajput
RAJPUTS.

-Answered by Rohit Rajput On 31 August 2019:09:43:09 AM


Question 6. Asked on :25 August 2019:09:06:06 AM

 what is currency of bhutan?

-Added by Harshita Rathore Physics » Gk

Answer:

Shivang Gupta
 Bhutanese ngutrum. 

-Answered by Shivang Gupta On 25 August 2019:02:44:10 PM


Question 7. Asked on :25 August 2019:09:05:07 AM

 What is currency of Belarus ?

-Added by Harshita Rathore Physics » Gk

Answer:

Shivang Gupta
Belarusian ruble. 

-Answered by Shivang Gupta On 25 August 2019:02:44:21 PM


Question 8. Asked on :21 August 2019:06:06:58 PM

 Write the principle of Electric Motor?

-Added by Himanshi Verma Physics » Magnetic Fields Of Electric Current

Answer:

Himanshi Verma

 An electric motor utilizes the magnetic effect of current. It works on the principle that when a rectangular coil is placed in a magnetic field and current is passed  through it a torque acts on the coil which rotates it continuously. When the coil rotates the shaft to it also rotates and electrical energy supplied to the motor is converted into mechanical energy.

-Answered by Himanshi Verma On 21 August 2019:06:09:13 PM


Question 9. Asked on :19 August 2019:10:59:58 PM

What are solar panels? Write three uses of solar panels.

-Added by Himanshi Verma Physics » Energy

Answer:

Prince Rawat

 A Panel's is designed to absorb the sun's rays as a source of energy for generating electricity or heating.

It is used for 

(i) conduct Electricity.

(ii) To reduce your dependency on the Utility company.

(iii) Absorb heat from the Sun.

-Answered by Prince Rawat On 20 August 2019:09:05:25 AM


Question 10. Asked on :18 August 2019:06:41:48 PM

 What is the Fleming's right hand rule?

-Added by Himanshi Verma Physics » Magnetic Effects Of Electric Current

Answer:

Himanshi Verma

 Stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If fore finger points in the direction of magnetic field, middle finger in the direction of current then thumb will point in the direction of motion or force.

-Answered by Himanshi Verma On 18 August 2019:07:08:32 PM


Question 11. Asked on :18 August 2019:06:40:37 PM

 Which is the better way to connect lights and other appliances in domestic wiring and why?

-Added by Himanshi Verma Physics » Electricity

Answer:

Master Purushottam
Parallel connection is a better way to connect lights and other appliances in domestic circuit.

-Answered by Master Purushottam On 22 August 2019:09:21:10 PM


Question 12. Asked on :18 August 2019:06:37:39 PM

 Why the filament of bulb has high melting point?

-Added by Himanshi Verma Physics » Electricity

Answer:

Akki chauhan

 Because a bulb light up by heating the filament. The heated filament is the source of light, and if the melting of filament of bulb is low. so, it gets melt.

-Answered by Akki chauhan On 19 August 2019:09:38:00 AM


Question 13. Asked on :18 August 2019:06:26:53 PM

 Calculate the energy transferred by a 5A current flowing through a resistor of 2ohms for 30 Minutes.

-Added by Himanshi Verma Physics » Electricity

Answer:

priyanshu kumar
Calculate the energy transferred by a 5 A current flowing through a resistor of 2 ohm for 30 minutes.

-Answered by priyanshu kumar On 06 October 2019:09:35:50 AM


Question 14. Asked on :18 August 2019:06:24:41 PM

 What is solenoid? Where the magnetic field is uniform in solenoid? 

-Added by Himanshi Verma Physics » Magnetic Effects Of Electric Current

Answer:

priyanshu kumar

 A solenoid is a tightly is a tightly wound helical coil of wire whose diameter is small compared to its length.the magnetic field gencrated in the cuntre or core of a curret carrying solenoid is essentially uniform is directed along the axis of the solenoid.

-Answered by priyanshu kumar On 19 August 2019:09:58:38 AM


Question 15. Asked on :26 July 2019:07:52:37 PM

Why the electrons drift away from the negative terminal and toward the positive terminal?

-Added by Shalu Shukla Physics » Electricity

Answer:

Himanshi Verma

 The electrons are repelled by the negative charge at the negative terminal of the battery and attracted by the positive charge at the positive terminal. Therefore the electrons drift away from the negative terminal and toward the positive terminal.

-Answered by Himanshi Verma On 26 July 2019:07:54:53 PM


Question 16. Asked on :26 July 2019:07:49:10 PM

 What is frictional electricity?

-Added by Himanshi Verma Physics » Electicity

Answer:

Himanshi Verma

 The electricity developed by rubbing or friction is called frictional electricity.

-Answered by Himanshi Verma On 26 July 2019:07:50:38 PM


Question 17. Asked on :18 July 2019:07:21:33 PM

 What is Galvanometer ?

-Added by Shalu Shukla Physics » Magnetic Effects Of Electricity

Answer:

Himanshi Verma

 Galvanometer is an instrument that can detect the presence of a current in a circuit. The pointer remains at zero for zero current flowing through it. 

-Answered by Himanshi Verma On 18 July 2019:07:22:40 PM


Question 18. Asked on :18 July 2019:07:10:55 PM

 What is armature in an Electric Motor?

-Added by Himanshi Verma Physics » Magnetic Effects Of Electricity

Answer:

Shalu Shukla

 The soft iron core, on which the coil is wound plus the coils is called armature.

-Answered by Shalu Shukla On 18 July 2019:07:12:05 PM


Question 19. Asked on :18 July 2019:07:09:27 PM

 What is the role of the split ring in an electric current ?

-Added by Himanshi Verma Physics » Magnetic Effects Of Electricity

Answer:

Master Mind

Split ring works as commutator in a electric motor. 

-Answered by Master Mind On 18 July 2019:07:21:34 PM


Question 20. Asked on :18 July 2019:07:09:27 PM

 What is the role of the split ring in an electric current ?

-Added by Himanshi Verma Physics » Magnetic Effects Of Electricity

Answer:

Shalu Shukla

 Split ring work as a commutator, that is direction of flow of current through a circuit.

-Answered by Shalu Shukla On 18 July 2019:07:25:16 PM


Question 21. Asked on :18 July 2019:07:04:16 PM

What is the Right Hand Thumb Rule ?

-Added by Shalu Shukla Physics » Magnetic Effects Of Electricity

Answer:

Himanshi Verma

 If you holding current carrying conductor in your right hand such that the thumb points towards the direction of current then fingers will show the direction of current. This is known as the Right hand thumb rule.

-Answered by Himanshi Verma On 18 July 2019:07:07:17 PM


Question 22. Asked on :08 July 2019:05:03:29 PM

 Why don't two magnetic lines of force intersected each other ?

-Added by Himanshi Verma Physics » Magnetic Effects Of Electric Current

Answer:

Nishant Nishant

 Ans. If magnetic field lines intersect each other then the magnetic field (magnetic field lines) will have two different directions at that point. This is not possible. So they don't intersect.Feb 4, 2018

-Answered by Nishant Nishant On 12 July 2019:06:19:14 PM


Question 23. Asked on :06 July 2019:07:20:04 PM

 An lamp whose resistance is 20Ω and a conductor of resistance are connected to 6V battery. calculate the total resistance?

-Added by Khushi Chauhan Physics » Electricity

Answer:

Harshita Rathore

Rasistence

-Answered by Harshita Rathore On 24 August 2019:02:57:23 PM


Question 24. Asked on :22 March 2019:04:54:54 PM

 What is critical Angle? 

-Added by Rohit rajput Physics » Science

Answer:

Himanshi Verma

 The angle of incidence in a denser medium for which the angle of refraciton in rarer medium becomes 90° is called the critical angle.

-Answered by Himanshi Verma On 23 March 2019:05:32:30 PM


 

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