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 Physics Questions

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Q:

Which of the following is not a unit of energy?

A) Calorie B) Joule
C) electron volt D) Watt
 
Answer & Explanation Answer: D) Watt

Explanation:

The watt(symbol: W) is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second, and is used to quantify the rate of energy transfer. In dimensional analysis it is described by

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Q:

If an electron and a photon have the same wavelength, then they will have the same

A) velocity B) linear momentum
C) angular momentum D) energy
 
Answer & Explanation Answer: B) linear momentum

Explanation:
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Q:

For every action, there is an equal and opposite reaction, is Newton's

A) First law B) Second law
C) Third law D) Fourth law
 
Answer & Explanation Answer: C) Third law

Explanation:
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Q:

What is the resistance (in ohm) of an electrical component if a current of 0.5 A passes through it on application of 20 V of potential difference across it?

A) 10 B) 20
C) 80 D) 40
 
Answer & Explanation Answer: D) 40

Explanation:
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Q:

Transformer is a device to convert

A) D.C. to A.C. B) Low voltage D.C. into high voltage D.C.
C) Low voltage A.C. into high voltage A.C. D) Mechanical energy into Electrical energy
 
Answer & Explanation Answer: A) D.C. to A.C.

Explanation:
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Q:

Steel is more elastic than Rubber. True or False?

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Elasticity is measured as ratio of stress to strain. For a given amount of stress, the strain produced in the steel is comparatively smaller than the strain produced in the rubber.


 


Therefore, with the help of Young's modulus, it can be concluded that steel has greater elasticity than rubber.

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Q:

The numerical value of a physical quantity is its _______________.

A) vector B) magnitude
C) direction D) property
 
Answer & Explanation Answer: B) magnitude

Explanation:
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Q:

Which of the following describes an electric motor?

A) Is found in many appliances with moving parts, like a vacuum cleaner or a blender. B) Changes electric energy to mechanical energy.
C) Uses the interaction between a spinning coil of wire and magnet. D) Can be powered by a hand crank.
 
Answer & Explanation Answer: B) Changes electric energy to mechanical energy.

Explanation:

An electric motor is an electrical machine that converts electrical energy into mechanical energy.

                                   Which_of_the_following_describes_an_electric_motor1596165769.jpg image

Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. 

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