Physics - Questions and Answers, General Study (GK)

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541.

At a point inside a charged conductor, the

(a)Potential is constant

(b)Electric field is zero

(c)Both 1 and 2

(d)Electric field is constant

Comment

Answer is: C

542.

Capacity of a parallel plate condenser can be increased by

(a)Decreasing the thickness of plate

(b)Increase the thickness of plate

(c)Decreasing the distance between the plate

(d)Increasing the distance between plate

Comment

Answer is: C

543.

Current provided by a battery is maximum when

(a)Internal resistance is less than external resistance

(b)Internal resistance is greater than external resistance

(c)Internal resistance is equal to external resistance

(d)None of the above

Comment

Answer is: D

544.

A magnetic needle is kept in non uniform magnetic field. it experiences

(a)A force but not a torque

(b)A force and a torque

(c)A torque but not a force

(d)None of the above

Comment

Answer is: C

545.

A moving charge is subjected to an external magnetic field. The change in the kinetic energy of the particle

(a)Depends upon whether the field is uniform or non-uniform

(b)Is always zero

(c)Increases with the increase in the field strength

(d)Both 1 and 3

Comment

Answer is: A

546.

Dynamo core is laminated because

(a)Magnetic field increases

(b)Magnetic saturation level in core increases

(c)Residual magnetism in core decreases

(d)Loss of energy in core to Eddy currents decrease

Comment

Answer is: D

547.

The resistivity of wire

(a)Increase with the length of wire

(b)Decrease with the area of cross section

(c)Decrease with the length and increase with the cross section of a wire

(d)None of the above

Comment

Answer is: D

548.

The consider of following statements
1. An atom bomb is based upon the principle of nuclear fission.
2. Hydrogen bomb is based upon the principle of nuclear fusion.
3. Nuclear reactor is based upon the principle of controlled nuclear fission.
Which of the statements given is/are correct?

(a)Only 1

(b)Only 3

(d)1, 2 and 3

Comment

Answer is: D

549.

An atomic pile is used for

(a)Producing X-rays

(b)Conducting nuclear fission

(c)Conducting thermonuclear fission

(d)Temperature

Comment

Answer is: B

550.

In black and white televisions, pictures on the screen are produced due to Bombardment of

(a)X rays photons on a white screen

(b)X rays photons on a white fluorescent screen

(c)Electrons on a white screen

(d)Electrons on a fluorescent white screen

Comment

Answer is: D

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Physics - Questions and AnswersPage 55

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