Sawaal
2
Q:

Radio waves sent out by a radio stations are reflected by

A) troposphere B) stratosphere
C) mesosphere D) ionosphere

Answer:   D) ionosphere



Explanation:

This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.

Subject: Physics
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As an object falls freely its ___________________.

 

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What is the standard room temperature in Kelvin?

 

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Answer & Explanation Answer: A) 98 K

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An object, starting from rest, moves with constant acceleration of 4 m/s2. After 8 s, its speed is

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1 watt is equal to 1 ____________

 

A) J s-1   B) J s
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Answer & Explanation Answer: A) J s-1  

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Q:

A body is initially moving with a velocity of 10 m/s. It undergoes an acceleration of 2 m/s2 for 5 seconds. Find the displacement (in m) of this body in these 5 seconds.

 

A)  25 B)  37.5
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Answer & Explanation Answer: D)  75

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