Physics Practice Questions Set 15

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For India's Top Government Exams

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The joule-Thomson process is extremely useful and economical for attaining low temperatures. The process can be categorized as ___
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1 point

isobaric process

isoenthalpic process

adiabatic process

isochoric process

After using it for some time, big transformers get heated up. This is due to the fact that

1. current produces heat in the transformers
2. hysteresis loss occurs in the transformers
3. liquid used for cooling gets heated
Select the correct answer using the code given below.

1 point

1 only

2 and 3 only

1 and 2 only

1, 2 and 3

Infrared, visible, and ultraviolet radiations/light have different properties. Which one of the following statements related to these radiations/light is not correct?
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1 point

The wavelength of infrared is more than that of ultraviolet radiation.

The wavelength of ultraviolet is smaller than that of visible light.

The photon energy of visible light is more than that of infrared light.

The photon energy of ultraviolet is lesser than that of visible light.

A ray of light is incident on a plane mirror at an angle of 40 with respect to the surface normal. When it gets reflected in the mirror, it undergoes a deviation of ___
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1 point

40°

100°

90°

80°

Which one of the following types of glasses are used for making optical instruments?
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1 point

Pyrex glass

Soft glass

Hard glass

Flint glass

The wires are made having the same length 1 and area of cross-section A. Wire 1 is made of copper and wire 2 is made of aluminum. It is given that the electrical conductivity of copper is more than that of aluminum. In this context, which one of the following statements is correct?
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1 point

The resistance of wire 1 will be higher than that of wire 2.

The resistance of wire 2 will be higher than that of wire 1.

The resistance of both the wires will be the same.

If the same current is flown through both the wires, the power dissipated in both the wires will be the same.

Ultrasonic waves are produced by making use of
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1 point

ferromagnetic material

ferrimagnetic material

piezoelectric material

pyroelectric material

A person is standing on frictionless horizontal ground. How can he move by a certain distance on this ground?
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1 point

By sneezing

By jumping

By running

By rolling

Which one of the following statements is not correct? *

1 point

The cathode rays originate from the cathode and proceed towards the anode in a cathode-ray discharge tube.

he television picture tubes are nothing but cathode-ray tubes.

The cathode rays themselves are not visible.

The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube.

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