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NEET Physics Solved Question Paper 2016

Multiple Choice Questions

31.

Two charged spheres separated by a distance 'd' exert some force on each other. If they are immersed in a liquid of dielectric constant 2, then what is the force exerted, if all other conditions are same?

32.

A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor?

Electric field
Drift velocity
Current
Current density

33.

The angle of dip at a certain place where the horizontal and vertical components of the earth's magnetic field are equal is

30^o
75^o
60^o
45^o

34.

A series resonant LCR circuit has a quality factor ( Q-factor) 0.4. If R = 2 kΩ, C = 0.1 μF, then the value of inductance is

0.1 H
0.064 H
2 H
5 H

35.

On increasing the temperature of a conductor, its resistance increases because the

relaxation time increases
electron density decreases
relaxation time decreases
relaxation time remains constant

36.
The magnetic field at the centre O of the arc shown in the figure is

2 $I (\sqrt{2} + π) \times \frac{10^{- 7}}{r}$

2 $I (\sqrt{2} + \frac{π}{4}) \times \frac{10^{- 7}}{r}$

$I (\sqrt{2} + π) \times \frac{10^{- 7}}{r}$

$I (\sqrt{2} + \frac{π}{4}) \times \frac{10^{- 7}}{r}$

2 $I (\sqrt{2} + \frac{π}{4}) \times \frac{10^{- 7}}{r}$

Here, a = $\frac{r}{\sqrt{2}}$

Magnetic field at point O due to AB is

B₁ = $\frac{μ_{0}}{4 π} \frac{I}{a}$

= $\frac{μ_{0} I}{4 π (\frac{r}{\sqrt{2}})}$

Magnetic field at point O due to BCD is

B₂ = $\frac{μ_{0} I}{4 π a} (\frac{π}{2})$

Magnetic fieid at point O due to DE is

B₃ = $\frac{μ_{0} I}{4 π α}$

B₃ = $\frac{μ_{0} I}{4 π (\frac{r}{\sqrt{2}})}$

Resultant magnetic field at point O is

B = B₁ + B₂+ B₃

= $\frac{μ_{0} I}{4 π (\frac{r}{\sqrt{2}})} + \frac{μ_{0} I}{4 πr} (\frac{π}{2}) + \frac{μ_{0} I}{4 π (\frac{r}{\sqrt{2}})}$

= $\frac{μ_{0} I}{4 πr} (\sqrt{2} + \frac{π}{2} + \sqrt{2})$

B = $\frac{μ_{0} I}{4 πr} (2 \sqrt{2} + \frac{π}{2})$

= $\frac{μ_{0} 2 I}{4 πr} (\sqrt{2} + \frac{π}{4})$

B = $\frac{10^{- 7} \times 2 I}{r} (\sqrt{2} + \frac{π}{4})$ .... $[∵ \frac{μ_{0}}{4 π} = 10^{- 7}]$

37.

Assertion: In water, value of magnetic field decreases.

Reason: Water is a diamagnetic substance

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: The electromagnetic waves are transverse in nature.

Reason: Waves of wavelength 10 µm are radiowave and microwave.

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: Lines of force are perpendicular to conductor surface.

Reason: Generally electric field is perpendicular to equipotential surface.

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: Magnetic field is useful in producing parallel beam of charged particle.

Reason: Magnetic field inhibits the motion of
charged particle moving across it.

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.