Physics Questions

Q:

Diamond does not conduct electricity, because

A) It's structure is very compact B) It is of crystalline nature
C) There are only carbon atoms present in it D) No free electrons are present in it
 
Answer & Explanation Answer: D) No free electrons are present in it

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Q:

Find the acceleration (in m/s2) produced in a body of mass 4 kg when a force of 24 N is applied on it.

A) 96 B) 6
C) 12 D) 48
 
Answer & Explanation Answer: B) 6

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Q:

_______________ states that the ratio of the potential difference across a conductor to the current flowing through it, is a constant, provided that its physical conditions, such as temperature, remain constant.

A) Lenz's Law B) Hooke's Law
C) Ohm's Law D) The coulomb's law
 
Answer & Explanation Answer: C) Ohm's Law

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Q:

If a current of 1.5 A is maintained in a resistor of 10 ohm, then the energy dissipated in the resistor in 1 minute will be 

 

 

A) 15 W  B) 22.5 W 
C) 135 W  D) 1350 W
 
Answer & Explanation Answer: D) 1350 W

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Q:

Which type of electromagnetic radiation has the shortest wavelength?

A) Gamma rays B) X-rays
C) Radio waves D) Infrared rays
 
Answer & Explanation Answer: A) Gamma rays

Explanation:

The order of wavelengths of electromagnetic spectrum is as follows ::

(Shortest to Longest) - Gamma, X-Rays, UV, Visible, Infrared, Microwaves, Radio Waves.

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Q:

If the initial velocity of a car is 5 m/s, and the final velocity is 10 m/s in 5s, then the acceleration is ___.

A) 10 m/s2 B) 0.1 m/s2
C) 1 m/s2 D) 5 m/s2
 
Answer & Explanation Answer: C) 1 m/s2

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Q:

When the car takes a bend, the force that pushes us to the outside of the curve is the

A) Centripetal Force B) Centrifugal Force
C) Frictional Force D) Tension Force
 
Answer & Explanation Answer: B) Centrifugal Force

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Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is double that of earth and radius is same as that of earth is _________________.

A) 2g B) g
C) g/2 D) 4g
 
Answer & Explanation Answer: A) 2g

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