Govt Exam — General Science — Physics
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Showing 1–10 of 34 questions
in Physics
Q.1
Easy
Physics
Newton first law also called?
Correct Answer:
C. Law of inertia
Explanation:
First law = Law of Inertia.
Q.2
Easy
Physics
Unit of electric current?
Correct Answer:
C. Ampere
Explanation:
Current measured in Amperes.
Q.4
Easy
Physics
Sound cannot travel through?
Correct Answer:
C. Vacuum
Explanation:
Sound needs medium, not vacuum.
Q.5
Easy
Physics
A body is thrown vertically upward with a velocity of 40 m/s. What is the maximum height reached? (Take g = 10 m/s²)
Correct Answer:
A. 80 m
Explanation:
Using v² = u² - 2gh, where final velocity v = 0, u = 40 m/s, g = 10 m/s². We get h = 1600/20 = 80 m
Q.6
Easy
Physics
Which of the following is NOT a SI base unit?
Correct Answer:
C. Newton
Explanation:
Newton is a derived unit (kg⋅m⋅s⁻²). Ampere, Kelvin, and Mole are SI base units
Q.7
Easy
Physics
A car moving at 20 m/s suddenly applies brakes with deceleration of 5 m/s². How far does it travel before stopping?
Correct Answer:
B. 40 m
Explanation:
Using v² = u² + 2as, where v = 0, u = 20 m/s, a = -5 m/s². We get s = 400/10 = 40 m
Q.8
Easy
Physics
What is the SI unit of pressure?
Correct Answer:
B. Pascal
Explanation:
Pascal (Pa) is the SI unit of pressure, equal to 1 N/m²
Q.9
Easy
Physics
Which phenomenon explains the formation of a rainbow?
Correct Answer:
A. Refraction and dispersion
Explanation:
Rainbows form due to refraction of sunlight entering water droplets and dispersion of different wavelengths
Q.10
Easy
Physics
What is the angle of incidence when light ray falls on a plane mirror and the angle of reflection is 35°?
Correct Answer:
A. 35°
Explanation:
According to law of reflection, angle of incidence equals angle of reflection