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CBSE

NEET Physics : Electric Charges and Fields

Multiple Choice Questions

31.

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

30^o, 60^o
0^o, 90^o
45^o, 90^o
90^o, 0^o

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 $\vec{E}$ = E₀ $\hat{i}$ and $\vec{B} = B_{0} \hat{i}$ velocity $\vec{v} = v_{0} \hat{j}$ . The speed of the particle will become $\frac{\sqrt{5}}{2} ν_{0}$ after a time

$\frac{m ν_{0}}{q E_{0}}$
$\frac{m ν_{0}}{2 q E_{0}}$
$\frac{\sqrt{3} {mν}_{0}}{2 q E_{0}}$
$\frac{\sqrt{5} {mν}_{0}}{2 q E_{0}}$

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 $\vec{v} = v_{0} \hat{i}$ in the electric field $\vec{E} = E_{0} \hat{j}$ . 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 $α$ -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.

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NEET Physics : Electric Charges and Fields

Multiple Choice Questions