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Q:

Why does water tank appear shallower when viewed from the top?

A) Due to reflection B) Due to refraction
C) Due to diffraction D) Due to total internal reflection
 
Answer & Explanation Answer: B) Due to refraction

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Q:

If the vector sum of torques acting on a system is zero, then the object is in _______.

A) static equilibrium B) translatory equilibrium
C) linear equilibrium D) rotational equilibrium
 
Answer & Explanation Answer: D) rotational equilibrium

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Q:

The time period of a sound wave is 0.01 seconds. Find its frequency (in Hz).

A) 100 B) 10
C) 50 D) 20
 
Answer & Explanation Answer: A) 100

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Q:

Anemometer is an instrument meant for measuring __________

A) velocity B) air masses
C) wind speed D) temperature
 
Answer & Explanation Answer: C) wind speed

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Q:

In the equation of motion v = u + at, u represents _________________

A) initial velocity B) final velocity
C) kinetic energy D) potential energy
 
Answer & Explanation Answer: A) initial velocity

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Q:

Which electromagnetic wave has the highest frequency?

A) Gamma Rays B) Radio waves
C) X rays D) Microwaves
 
Answer & Explanation Answer: A) Gamma Rays

Explanation:

In all Electromagnetic waves, Gamma Rays have the highest frequency and the lowest wavelength. Whereas Radio ways have lowest Frequency and the highest wavelength. 

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Q:

Which motion has magnitude of static frictional force directly proportional to normal reaction?

A) Impending motion B) Actual motion
C) Both 1 and 2 D) None of the above
 
Answer & Explanation Answer: A) Impending motion

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Q:

During which of the following operating conditions of an automobile, carbon monoxide content in exhaust gas is maximum?

A) Acceleration B) Cruising
C) Idle running D) Deacceleration
 
Answer & Explanation Answer: C) Idle running

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