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Q) Which mirror is used in car headlights?
Correct Answer - Option
(B)
Explanation :
Concave mirrors are used in headlights because they converge light rays into a strong, parallel beam.
38500+ Important MCQs for AFCAT
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Learn AFCAT MCQs with answers [Page 4943 ]
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Q) What type of lens is used to correct myopia (short-sightedness)?
Correct Answer - Option
(B)
Explanation :
A concave lens diverges light rays, helping the image form correctly on the retina for people with myopia.
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Q) Which of the following is not a scalar quantity?
Correct Answer - Option
(B)
Explanation :
Velocity is a vector quantity because it has both magnitude and direction.
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Q) Which instrument is used to measure electric current?
Correct Answer - Option
(B)
Explanation :
An ammeter measures electric current and is connected in series with the circuit.
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Q) Who discovered the law of universal gravitation?
Correct Answer - Option
(B)
Explanation :
Sir Isaac Newton formulated the law of universal gravitation describing the attraction between two masses.
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Q) Which property of light proves that it travels in a straight line?
Correct Answer - Option
(C)
Explanation :
Rectilinear propagation explains that light travels in straight lines, proven by the formation of shadows.
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Q) Which of the following is an example of periodic motion?
Correct Answer - Option
(B)
Explanation :
A pendulum’s motion repeats at regular intervals, making it periodic motion.
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Q) What type of energy transformation occurs in an electric iron?
Correct Answer - Option
(B)
Explanation :
In an electric iron, electrical energy is converted into heat energy for ironing clothes.
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Q) Which phenomenon explains the twinkling of stars?
Correct Answer - Option
(B)
Explanation :
Twinkling occurs due to atmospheric refraction — light from stars bends as it passes through layers of air.
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Q) Which of the following devices converts sound energy into electrical energy?
Correct Answer - Option
(B)
Explanation :
A microphone converts sound (mechanical vibrations) into electrical signals.
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