Test : Physics - 3 - NDA MCQ
20 Questions MCQ Test NDA (National Defence Academy) Mock Test Series 2024 - Test : Physics - 3
When a wave goes from one level to another, there is a change in the
(i) Velocity
(ii) Amplitude
(iii) Frequency
(iv) Wavelength
Choose the correct answer
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Consider the following statements: Assertion (A): The velocity of sound in air increases due to the presence of moisture in itReason (R): The presence of moisture in air lowers the density of air of these statements
The velocity of sound is generally greater in solids than in gases because
If a sound travels from air to water, the quantity that remain unchanged is
A gas is a metallic cylinder is suddenly compressed by a piston which is maintained at the same position with the passage of time the pressure of air
A person standing in front of a mirror finds his image thinner but with normal height .This implies that the mirror is
Which one of the following phenomena cannot be attributed to the refraction of light?
To an observer on the lunar surface, during the day time the sky will appear to be
When a stone is dropped on the surface of still water, the waves produced are
There is no net transfer of energy by the particles of the medium in
Which one of the following does TV remote control unit use to operate a TV set?
Which of the following types is used by computed tomography employed for visualisation of the internal structure of human body?
When light waves pass from air to glass, the variables affected are
Consider the following statements(i) Light of longer wavelength is scattered much more than the light of shorter wavelength(ii) The speed of visible light in water is 0.95 times the speed in vacuum(iii) Radio waves are produced by rapidly oscillating electrical currents(iv) To detect the over speeding vehicles, police use the Doppler effect of reflected short radio wavesWhich of these statements are correct?
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1 docs|91 tests
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