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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:

During uniform motion of an object along a straight line, the ________ remains constant with time.

A) Time B) Velocity
C) Acceleration D) Distance
 
Answer & Explanation Answer: B) Velocity

Explanation:
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Q:

If the radius of the earth decreases and its mass remains the same, then the value of "acceleration due to gravity" will _____ .

A) decrease B) increase
C) remain the same D) become zero
 
Answer & Explanation Answer: B) increase

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Q:

The first equation of motion gives the relation between

A) position and time B) position and velocity
C) velocity and time D) velocity and acceleration
 
Answer & Explanation Answer: C) velocity and time

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Q:

Who discovered theory of relativity?

A) Isaac Newton B) Albert Einstein
C) Niel Bohr D) Michael Faraday
 
Answer & Explanation Answer: B) Albert Einstein

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Q:

In a sound wave compressions are regions where density _________________________

A) as well as pressure is high B) as well as pressure is low
C) is high and pressure is low D) is low and pressure is high
 
Answer & Explanation Answer: A) as well as pressure is high

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Q:

Mohan, having a mass of 40 kg, runs up a staircase of 50 steps in 10 s. If the height of each step is 15 cm, then what is his power?

A) 300 W B) 200 W
C) 100 W D) 400 W
 
Answer & Explanation Answer: A) 300 W

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Q:

If ice floating on water in a vessel melts, the water level in the vessel _______.

A) increases B) does not change
C) first increases before decreasing D) decreases
 
Answer & Explanation Answer: B) does not change

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