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Q:

Which best describes how air moves during convection?

A) cool air falls down B) warm air falls down
C) cool air is replaced by warm air D) air always falls down

Answer:   A) cool air falls down



Explanation:

During convection, cool and dense air falls through the warmer and less dense air. The warm air having less mass is being displaced by the cooler which is much heavy. Convection always involves the air rising through the atmosphere.

 

Subject: Physics
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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

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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

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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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