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Q) Which physical quantity is measured in Hertz?
Correct Answer - Option
(B)
Explanation :
Frequency is measured in Hertz (Hz), which represents the number of cycles per second.
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Q) What is the SI unit of electric charge?
Correct Answer - Option
(B)
Explanation :
The SI unit of electric charge is the Coulomb, which is equivalent to one ampere-second.
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Q) Which of the following quantities is a vector?
Correct Answer - Option
(C)
Explanation :
Velocity has both magnitude and direction, making it a vector quantity.
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Q) What is the acceleration due to gravity on the surface of the Earth?
Correct Answer - Option
(B)
Explanation :
The acceleration due to gravity near the Earth's surface is approximately 9.8 m/s².
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Q) Which law states that current is directly proportional to voltage and inversely proportional to resistance?
Correct Answer - Option
(C)
Explanation :
Ohm’s Law states that V = IR, where current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R).
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Q) What is the unit of power?
Correct Answer - Option
(B)
Explanation :
Power is the rate at which work is done, measured in watts (1 watt = 1 joule/second).
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Q) Which physical quantity is measured in Pascal?
Correct Answer - Option
(B)
Explanation :
Pressure is measured in pascals (Pa), where 1 Pa = 1 N/m².
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Q) What happens to the frequency of a wave if its wavelength decreases and speed remains constant?
Correct Answer - Option
(A)
Explanation :
Since wave speed = frequency × wavelength, a decrease in wavelength means frequency must increase if speed is constant.
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Q) Which of the following is a non-renewable source of energy?
Correct Answer - Option
(C)
Explanation :
Coal is a fossil fuel and non-renewable source of energy because it takes millions of years to form.
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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.
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