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Q:

When body is accelerated

A) its velocity never changes B) its speed always changes
C) its direction always changes D) its speed may or maynot change
 
Answer & Explanation Answer: D) its speed may or maynot change

Explanation:
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Q:

Erg cross Sec is the unit of

A) Angular momentum B) Linear Momentum
C) Planck's constant D) Energy
 
Answer & Explanation Answer: C) Planck's constant

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33 10890
Q:

The Capacity of a Communication Channel is Measured in

A) Band rate B) Band width
C) Data flow D) Bit capacity
 
Answer & Explanation Answer: B) Band width

Explanation:

The path that data takes from source to destination is called a Channel. A channel is a communication medium. A channel has a certain capacity for transmitting information. 

 

The "capacity" of a channel is the theoretical upper-limit to the bit rate over a given channel that will result in negligible errors. Channel capacity is often measured by its Bandwidth in Hz or its data rate in bits per second.

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Q:

Light from the sun reaches us in nearly

A) 5 min B) 4.30 hrs
C) 8 min D) 5.30 hrs
 
Answer & Explanation Answer: C) 8 min

Explanation:

The light from the sun takes about 8 minutes to reach the Earth after it has been emitted from the sun's surface.

 

The time it takes for light to reach planets in our Solar System varies from about 3 minutes for Mercury to about 5.3 hours for Pluto.

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20 10783
Q:

According to Rutherford the radius of the nucleus is about ______ than the radius of the atom.

 

A)  105 times greater B) 105 times lesser
C) 109 times greater D) 107 times greater
 
Answer & Explanation Answer: B) 105 times lesser

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Q:

Which of the following electromagnetic waves has minimum wavelength?

 

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

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Q:

Find the acceleration (in m/s2) of a body which accelerates from 15 m/s to 40 m/s in 2 seconds.

 

A) 12.5 B) 27.5  
C) 25 D) 55
 
Answer & Explanation Answer: A) 12.5

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Q:

What will be the acceleration produced when a force of 21 N is applied on an object of mass 3 kg?

 

A) 0.7 m/s2 B) 7 m/s2
C) 0.007 m/s2 D) 70 m/s2
 
Answer & Explanation Answer: B) 7 m/s2

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