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Q) What type of lens is used to correct myopia (short-sightedness)?
(A) Convex lens
(B) Concave lens
(C) Cylindrical lens
(D) Plano-convex lens
Correct Answer - Option
(B)
Explanation :
A concave lens diverges light rays, helping the image form correctly on the retina for people with myopia.
Q) Which of the following is not a scalar quantity?
(A) Mass
(B) Velocity
(C) Temperature
(D) Energy
Correct Answer - Option
(B)
Explanation :
Velocity is a vector quantity because it has both magnitude and direction.
Q) Which instrument is used to measure electric current?
(A) Voltmeter
(B) Ammeter
(C) Galvanometer
(D) Ohmmeter
Correct Answer - Option
(B)
Explanation :
An ammeter measures electric current and is connected in series with the circuit.
Q) Who discovered the law of universal gravitation?
(A) Albert Einstein
(B) Isaac Newton
(C) Galileo Galilei
(D) Niels Bohr
Correct Answer - Option
(B)
Explanation :
Sir Isaac Newton formulated the law of universal gravitation describing the attraction between two masses.
Q) Which property of light proves that it travels in a straight line?
(A) Reflection
(B) Refraction
(C) Rectilinear propagation
(D) Interference
Correct Answer - Option
(C)
Explanation :
Rectilinear propagation explains that light travels in straight lines, proven by the formation of shadows.
Q) Which of the following is an example of periodic motion?
(A) A ball rolling on a floor
(B) A pendulum swinging
(C) A car moving on a road
(D) A stone dropped from a height
Correct Answer - Option
(B)
Explanation :
A pendulum’s motion repeats at regular intervals, making it periodic motion.
Q) What type of energy transformation occurs in an electric iron?
(A) Mechanical to electrical
(B) Electrical to heat
(C) Heat to electrical
(D) Chemical to heat
Correct Answer - Option
(B)
Explanation :
In an electric iron, electrical energy is converted into heat energy for ironing clothes.
Q) Which phenomenon explains the twinkling of stars?
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
Correct Answer - Option
(B)
Explanation :
Twinkling occurs due to atmospheric refraction — light from stars bends as it passes through layers of air.
Q) Which of the following devices converts sound energy into electrical energy?
(A) Speaker
(B) Microphone
(C) Amplifier
(D) Transistor
Correct Answer - Option
(B)
Explanation :
A microphone converts sound (mechanical vibrations) into electrical signals.
Q) Which color of light has the highest frequency?
(A) Red
(B) Yellow
(C) Violet
(D) Green
Correct Answer - Option
(C)
Explanation :
Among visible light, violet has the shortest wavelength and thus the highest frequency.
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