Physics - Questions and Answers, General Study (GK)

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531.

Dispersion can take place for

(a)Transverse waves only but not for longitudinal waves

(b)Longitudinal waves only but not for transverse waves

(c)Both transverse and longitudinal waves

(d)Neither transverse nor longitudinal

Comment

Answer is: D

532.

Consider the following statements
1. Magnetic lines of force are closed curves while Electric lines are not.
2. Electric line of force are closed curves while magnetic lines are not.
3. Both Electric and magnetic lines of force are closed curves.
Which of statements given above is/are correct?

(a)Only 2

(b)Both 1 and 2

(c)Only 1

(d)1, 2 and 3

Comment

Answer is: C

533.

Consider the following statements
A magnetic field
1. Never exerts a force on a charged particle.
2. Always exerts a force on a changed particle.
3. Exerts a force on a charged particle if it is moving across the magnetic lines of force.
4. Exerts a force on a charged particle if it is moving along the magnetic lines of force.
Which of the statements given above is/are correct?

(a)Only 3

(b)Only 4

(c)Both 1 and 2

(d)1, 2, 3 and 4

Comment

Answer is: A

534.

The statement 'algebraic sum of the current meeting at a node zero.

(a)Lenz's law

(b)Kirchoff's law

(c)Ampere's law

(d)Faraday's law

Comment

Answer is: B

535.

When a possibly charged conductor connected to the earth, then

(a)Electrons flow from the conductor to earth

(b)Protons flow from conductor to earth

(c)Electons flow from earth to conductor

(d)No charge flow occurs

Comment

Answer is: C

536.

An electons is projected in the magnetic field along the line of force

(a)The electron speed will decrease but the direction will not change

(b)The electron speed will increase but the direction will not change

(c)There will be no effect on the motion of the electron

(d)None of the above

Comment

Answer is: C

537.

Consider the following statements
1. A galvanometer is converted into ammeter when we connected a low resistance in parallel.
2. A galvanometer is converted into a voltmeter when we connected a high resistance in series.
3. The conductivity of superconductor is infinite.
Which of the statements given is / are correct?

(a)Only 1

(b)Only 2

(d)1, 2 and 4

Comment

Answer is: D

538.

Eddy currents are produced in a material when it is

(a)Placed in electric field

(b)Heated

(c)Placed in a time varying magnetic field

(d)Placed in a uniform magnetic field

Comment

Answer is: C

539.

A charged particle is moving with velocity V in magnetic field of induction B. The force on the particle will be maximum when

(a)V and B are in opposite directions

(b)V and B are perpendicular

(c)V and B are in same phase

(d)None of the above

Comment

Answer is: B

540.

The electric current passing through a metallic wire produces heat because of

(a)Collision of the atoms of the metal with each other

(b)Collision of the conduction electron with the atoms of metallic wire

(c)Collision of conduction electrons with each other

(d)None of the above

Comment

Answer is: C

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Physics - Questions and AnswersPage 54

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