3
Q:

A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A) a parabola B) a circle
C) a horizontal straight line D) a vertical straight line

Answer:   A) a parabola



Explanation:

Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So by Newton's first law, it continues its motion horizontally with that velocity. But then, it is also pulled down by earth's gravity continuously. In this situation its horizontal motion gives way to the parabolic motion until it reaches the ground.

Subject: Physics
Q:

According to _____, pressure is equal to the force divided by the area on which it acts.

 

A) Hooke's Law B) Newton's Law
C) Pascal's Law D) Stefan-Boltzmann Law
 
Answer & Explanation Answer: C) Pascal's Law

Explanation:
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Q:

Which instrument is used to measure the intensity of light produced by an unknown source in terms of a standard source?

 

A) Dynamometer B) Calipers
C) Photometer D) Ammeter
 
Answer & Explanation Answer: C) Photometer

Explanation:
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Q:

Identify the unit of measuring intensity of sound.

 

A) Decibels B) Knots
C) Candela D) Ampere
 
Answer & Explanation Answer: A) Decibels

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Q:

Which instrument is used to measure blood pressure?

 

A) Sphygmomanometer B) Lactometer
C) Thermometer D) Glucometer
 
Answer & Explanation Answer: A) Sphygmomanometer

Explanation:
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Q:

The term ______ is prefixed to scientific terms to describe something that is constant.

 

A) Photo B) Iso
C) Mega D) Quasi
 
Answer & Explanation Answer: B) Iso

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Q:

1 horsepower = approximately _____ watts.

 

A) 746 B) 764
C) 647 D) 674
 
Answer & Explanation Answer: A) 746

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Q:

Which law of physics states that the force between the two electric charges reduces to a quarter of its former value when the distance between them is doubled?

 

A) Coulomb’s Law B) Stefan's Law
C) Pascal's Law D) Hooke's Law
 
Answer & Explanation Answer: A) Coulomb’s Law

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Q:

What is the unit of measure of a magnetic field?

A) Cobalt B) Ohm
C) Tesla D) Ampere
 
Answer & Explanation Answer: C) Tesla

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