Physics Practice Questions Set 14

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A parallel-plate capacitor, with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become
*

1 point

C/7

14C

Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is *

1 point

of variable refractive index

made up of slabs of different refractive indices

homogeneous and transparent

inhomogeneous and transparent

Which one of the following is not a semiconductor?
*

1 point

Silicon

Germanium

Quartz

Gallium arsenide

A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
*

1 point

5/4 R

4/5 R

R/5

Suppose voltage V is applied across a resistance R, The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be ___
*

1 point

P/3

2P/3

The optical phenomenon that is primarily responsible for the observation of a rainbow on a rainy day is
*

1 point

diffraction

interference

dispersion

reflection

When a piece of pure silicon is doped with aluminum, then
*

1 point

the conductivity of the doped silicon piece will remain the same

the doped silicon piece will become n-type

the doped silicon piece will become p-type

the resistivity of the doped silicon piece will increase

For which one of the following does the center of mass lie outside the body?
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1 point

A fountain pen

A cricket ball

A ring

A book

A photon of X-ray has the energy of 1 keV. A photon of visible radiation has an energy of 3 eV. In this context, which one of the following statements is not correct?
*

1 point

The wavelength of an X-ray photon is less than the wavelength of a visible radiation photon.

Both the photons have different energies.

The speeds of both the photons in a vacuum are different.

The frequency of X-ray photons is higher than the frequency of visible radiation photons.

Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm, and 1000 nm. Which wavelength(s) of the following can make a visual sensation to a human eye?
*

1 point

200 nm and 500 nm

500 nm and 1000 nm

500 nm only

200 nm and 1000 nm

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