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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What is the noise level of normal conversation?

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Answer & Explanation Answer: A) About 60 dB

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As an object falls freely its ___________________.

 

A) kinetic energy gets converted into potential energy B) potential energy gets converted into kinetic energy
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Due to an acceleration of 1  m/s2, the velocity of a body increases from 5 m/s to 10 m/s in a certain period. Find the displacement (in m) of the body in  that period.

 

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Answer & Explanation Answer: B) 37.5

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What is measured with the Nephometer?

 

A) volume of rainfall B) Cloud volume and speed
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Answer & Explanation Answer: B) Cloud volume and speed

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What is the standard room temperature in Kelvin?

 

A) 98 K B) 198 K
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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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Answer & Explanation Answer: C) 32 m/s

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1 watt is equal to 1 ____________

 

A) J s-1   B) J s
C) J s-2 D) J
 
Answer & Explanation Answer: A) J s-1  

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5 23083
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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