﻿ Medical Entrance Exam Question and Answers | Electric Charges and Fields - Zigya

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# Electric Charges and Fields

#### Multiple Choice Questions

31.

The angle of dip at the poles and the equator respectively are

• 30o, 60o

• 0o, 90o

• 45o, 90o

• 90o, 0o

32.

Assertion:  The conductivity of an electrolyte is very low as compared to a metal at room temperature.

Reason:  The number density of free ions in electrolyte is much smaller as compared to the number density of free electrons in metals. Further, ions drift much more slowly, being heavier.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

33.

A particle of charge q and mass m starts moving from the origin under the action of an electric field $\stackrel{\to }{\mathrm{E}}$ = E0$\stackrel{^}{\mathrm{i}}$  and  velocity  . The speed of the particle will become  after a time

34.

Assertion:  Magnetic lines forms closed loops in nature.

Reason: Mono-magnetic pole does not exist in nature.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

35.

An electron projected with velocity  in the electric field . Trace the path followed by the electron E0.

• Parabola

• Circle

• Straight line in + y direction.

• Straight line in -y direction

36.

Assertion:  Magnetic force is always perpendicular to the magnetic field.

Reason:  Electric force is along the direction of electric field.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

37.

Assertion: A charged particle can be accelerated in a cyclotron by the alternate distribution of the field.

Reason: Energy of the charged particle is increased by the field applied.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

38.

Assertion:  At rest, radium is decayed into Radon and an $\mathrm{\alpha }$-particle. They both moves back to back of each other.

Reason: Splitting of radioactive particle is based on conservation of linear momentum.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

39.

Assertion: Gauss's law shows diversion when inverse square law is not obeyed.

Reason: Gauss's law is a consequence of conservation of charges.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

40.

Assertion:  Gauss's law can't be used to calculate electric field near electric an electric dipole.

Reason: Electric dipole don't have symmetrical charge distribution.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not correct explaination of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.