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Q:

Definition of Force can be stated from:

A) Newton's second law of motion B) Newton's first law of motion
C) Newton's third law of motion D) Newton's law of gravitation
 
Answer & Explanation Answer: D) Newton's law of gravitation

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Q:

A particle experiences constant acceleration for 20 s after starting from rest. If it travels a distance X1, in the first 10 s and distance X2 in the remaining 10 s, then which of the following is true?

 

A) X2 = 2X1 B) X1 = 3X2
C) X2 = X1 D) X2 = 3X1
 
Answer & Explanation Answer: D) X2 = 3X1

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Q:

A good cricket fielder while catching a fast moving ball moves his hand along with the ball because ___.

A) He decreases the time of contact therefore increasing the force of contact B) He increases the time of contact thereby reducing the force of contact
C) He is afraid to take the ball and thus takes his hand out. D) He decreases the time of contact therefore reducing the force of contact
 
Answer & Explanation Answer: B) He increases the time of contact thereby reducing the force of contact

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Q:

One horse power is

A) 68 watts B) 746 watts
C) 786 watts D) 764 watts
 
Answer & Explanation Answer: B) 746 watts

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Q:

In which of the following activities is work NOT done?

A) Ashwin is standing on the platform B) Ashwin is running
C) Ashwin is walking D) Ashwin is climbing a bus
 
Answer & Explanation Answer: A) Ashwin is standing on the platform

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Q:

The speed of light in vacuum is estimated as ___ meters/second.

A) 3.00 x 108 B) 3.10 x 108
C) 3.12 x 108 D) 3.15 x 108
 
Answer & Explanation Answer: A) 3.00 x 108

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Q:

____ is used in periscope.

A) Plane mirror B) Prism
C) Concave lens D) Convex lens
 
Answer & Explanation Answer: A) Plane mirror

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Q:

Why does a sprinter keep running even after crossing the finishing line?

A) He wants to make sure that he crosses the line B) Inertia of rest takes some time to make him stop
C) Inertia of motion keeps him moving D) Friction between his shoes and the ground causes him to move beyond the line
 
Answer & Explanation Answer: C) Inertia of motion keeps him moving

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