Physics Questions

Q:

Filament of electric bulb is made of _____.

A) Magnesium B) Lead
C) Tin D) Tungsten
 
Answer & Explanation Answer: D) Tungsten

Explanation:
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Q:

The strength of a force is usually expressed by its __________.

A) Motion B) Direction
C) Interaction D) Magnitude
 
Answer & Explanation Answer: D) Magnitude

Explanation:
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Q:

If price of an article decreases from Rs 240 to Rs 220, when quantity demanded increases from 200 units to 210 units. Find point elasticity of demand?

A) 0.6 B) -1.8
C) -0.6 D) 1.8
 
Answer & Explanation Answer: C) -0.6

Explanation:
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Q:

Which determines the frequency of a sound wave?

A) Amplitude B) Speed
C) Source D) Medium
 
Answer & Explanation Answer: A) Amplitude

Explanation:

The frequency of a sound wave is determined by the amplitude of the wave. As amplitude of the wave is high the frequency of the wave will also be high.

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Q:

Heat transfer by conduction occurs when molecules

A) Collide B) Combine
C) Heated D) None of the above
 
Answer & Explanation Answer: A) Collide

Explanation:

Conduction is the movement of heat through a substance by the collision of molecules. It occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature.

Heat_transfer_by_conduction_occurs_when_molecules1560488148.jpg image

 

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Q:

One billionth of a second is called

A) microsecond B) picoseconds
C) millisecond D) nanosecond
 
Answer & Explanation Answer: D) nanosecond

Explanation:

A nanosecond (ns) is an SI unit of time equal to one thousand-millionth of a second or one billionth of a second.

 

  • That is, 1/1,000,000,000 of a second, or 10^−9 seconds.
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Q:

Which of these instruments is used to measure the wind speed?

A) Anemometer B) Inclinometer
C) Fathometer D) Calorimeter
 
Answer & Explanation Answer: A) Anemometer

Explanation:

Anemometer is the instrument that is used for measuring the speed of wind or any gas currents.

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Q:

Gravitational force is maximum at which place

A) Poles B) Tropic of cancer
C) Tropic of capricorn D) Equator
 
Answer & Explanation Answer: A) Poles

Explanation:

Gravitational force is the force that binds everything at the surface of the earth. Gravitational force is maximum at Poles.

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