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39000+ Important MCQs for BANK PO
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Q) Which phenomenon explains the bending of light as it passes from one medium to another?
(A) Reflection
(B) Diffraction
(C) Refraction
(D) Interference
Correct Answer - Option
(C)
Explanation :
Refraction occurs due to the change in the speed of light as it enters a different medium.
Q) Which device converts electrical energy into mechanical energy?
(A) Electric motor
(B) Electric generator
(C) Transformer
(D) Battery
Correct Answer - Option
(A)
Explanation :
An electric motor works on the principle of electromagnetic induction to convert electrical energy into mechanical energy.
Q) Which of the following has the lowest temperature?
(A) 0°C
(B) 0°F
(C) 100°C
(D) 273 K
Correct Answer - Option
(B)
Explanation :
0°F is equivalent to -17.78°C, which is lower than 0°C or 273 K.
Q) What is the acceleration due to gravity on Earth?
(A) 8.9 m/s²
(B) 9.8 m/s²
(C) 10.8 m/s²
(D) 7.9 m/s²
Correct Answer - Option
(B)
Explanation :
The acceleration due to gravity (g) on the surface of Earth is approximately 9.8 m/s².
Q) Which type of mirror is used in torches and headlights?
(A) Plane mirror
(B) Concave mirror
(C) Convex mirror
(D) Parabolic mirror
Correct Answer - Option
(B)
Explanation :
Concave mirrors focus light rays into a beam, making them useful in torches and headlights.
Q) Which color of light has the longest wavelength?
(A) Red
(B) Blue
(C) Green
(D) Violet
Correct Answer - Option
(A)
Explanation :
Red light has the longest wavelength and the lowest frequency among visible light colors.
Q) What is the unit of electric charge?
(A) Ampere
(B) Coulomb
(C) Volt
(D) Ohm
Correct Answer - Option
(B)
Explanation :
The SI unit of electric charge is the Coulomb (C), defined as the charge transported by 1 Ampere in 1 second.
Q) Which physical quantity is measured in Hertz?
(A) Speed
(B) Frequency
(C) Power
(D) Energy
Correct Answer - Option
(B)
Explanation :
Frequency is measured in Hertz (Hz), which represents the number of cycles per second.
Q) What is the SI unit of electric charge?
(A) Volt
(B) Coulomb
(C) Ohm
(D) Ampere
Correct Answer - Option
(B)
Explanation :
The SI unit of electric charge is the Coulomb, which is equivalent to one ampere-second.
Q) Which of the following quantities is a vector?
(A) Speed
(B) Work
(C) Velocity
(D) Energy
Correct Answer - Option
(C)
Explanation :
Velocity has both magnitude and direction, making it a vector quantity.
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