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 Physics Questions

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Q:

Air pressure is measured in which of the following units?

A) Steridian B) kg/mts
C) Newton D) Pascal
 
Answer & Explanation Answer: D) Pascal

Explanation:

Pressure = (Net Force) / (Applied area) = Newton / square meters


Measuring units of pressure are:

. Pascal
. Bar
. Torr
. Pounds per square inch (psi)
. Standard atmosphere (atm).

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Q:

The primary agent of contact metamorphism is

A) Temperature B) Pressure
C) Weathering D) Flowing water
 
Answer & Explanation Answer: A) Temperature

Explanation:

The primary agent of contact metamorphism is heat or temperature.

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Q:

Which metal is the best conductor of heat?

A) Silver B) Gold
C) Copper D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Silver is the best conductor of both heat and electricity among metals with a thermal conduction value of about 430 W/(mK).

Gold and copper both come respectably close to silver.

 

Copper being significantly less costly it is often chosen over silver in many applications.

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Q:

Refractive Index of glass with respect to water is

A) 4/3 B) 9/8
C) 2/3 D) 8/9
 
Answer & Explanation Answer: D) 8/9

Explanation:

Refractive Index of glass with respect to water can be calculated by 

(Refractive Index of glass with respect to air) × (1/Refractive Index of water with respect to air)

 

We know that,

Refractive Index of glass with respect to air = 4/3

Refractive index of water with respect to air = 3/2

 

Hence, Refractive Index of glass with respect to water = (4/3) x (2/3) = 8/9.

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Q:

In beta decay what is emitted

A) electron B) proton
C) neutron D) All of the above
 
Answer & Explanation Answer: A) electron

Explanation:
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Q:

What is the heat generated (in J) in a heating element of resistance 900 Ω when a current of 0.3 A passes through it for 10 seconds?

A) 2700 B) 810
C) 405 D) 1350
 
Answer & Explanation Answer: B) 810

Explanation:
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Q:

Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?

A) 200 nm and 500 nm B) 500 nm and 1000 nm
C) 500 nm only D) 200 nm and 1000 nm
 
Answer & Explanation Answer: C) 500 nm only

Explanation:
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.
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Q:

Graphite is a good conductor of electricity.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Graphite is a good conductor of electricity as it contains free electrons to move through the structure of the graphite.

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