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Q:

What happens to the Potential and Kinetic energies of a body as it falls down from a height?

A) Its Potential energy decreases while its Kinetic energy increases B) There is no change in its Potential or Kinetic energy
C) Its Potential and Kinetic energies decrease D) Its Potential energy increases while its Kinetic energy decreases
 
Answer & Explanation Answer: A) Its Potential energy decreases while its Kinetic energy increases

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Q:

What is not true with CT Scan?

A) Combines many X-ray images B) Scanning is often painful
C) Generates 3-D cross-sectional views D) Identifies normal and abnormal structures
 
Answer & Explanation Answer: B) Scanning is often painful

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Q:

What is the amount of work done when a body moves under a force of 1 N at a distance of 1 meter in the direction of the force?

A) 1 Joule B) 0.01 Joules
C) 100 Joules D) 10 Joules
 
Answer & Explanation Answer: A) 1 Joule

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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:

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:

____ 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:

Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line?

A) Force B) Mass
C) Momentum D) Inertia
 
Answer & Explanation Answer: A) Force

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