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Q:

As water is cooled from 4 deg C to 0 deg C, its density

A) increases B) decreases
C) remains same D) None of the above

Answer:   B) decreases



Explanation:

As water is cooled from 4 deg C to 0 deg C, the water reaches its freezing point and starts forming ice crystals. Then the volume of that ice cubes increases and its density decreases. Hence, it is the reason that ice will float on water as ice has less density than the water.

Subject: Physics
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Q:

Air is said to be saturated when

A) its pressure is minimum B) it contains the maximum content of water vapour
C) its thickness is maximum D) it blows over the barren land
 
Answer & Explanation Answer: B) it contains the maximum content of water vapour

Explanation:

Air is said to be saturated when it contains the maximum content of water vapour.

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1 51
Q:

Which waves cannot be transmitted through vacuum?

A) Electromagnetic B) Light
C) Sound D) Heat
 
Answer & Explanation Answer: C) Sound

Explanation:

Sound waves cannot be transmitted through vacuum. 

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2 43
Q:

when an atom loses an electron it becomes

A) neutron B) negative ion
C) positive ion D) none of the above
 
Answer & Explanation Answer: C) positive ion

Explanation:

If it loses an electron it becomes a positive ion

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1 24
Q:

which of the following has the longest wavelength

A) Infrared radiation B) γ-radiation
C) Ultraviolet radiation D) Visible radiation
 
Answer & Explanation Answer: A) Infrared radiation

Explanation:

Infrared radiation

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1 37
Q:

What factors contribute to global winds?

A) Coriolis Effect B) Convection Cells
C) Uneven warming of the earth by the sun D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

All of the factors that contribute to global winds are 

1) Uneven warming of the earth by the sun
2) Coriolis Effect
3) Convection Cells

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0 54
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:

Tensional forces normally cause which one of the following?

A) normal faults B) strike-slip faults
C) thrust faults D) reverse faults
 
Answer & Explanation Answer: A) normal faults

Explanation:

Tensional forces normally cause normal faults.

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1 59
Q:

In human relations, the irritation threshold is the

A) length of time an annoying behavior continues B) action that causes an annoyance
C) frequency of the annoying behavior D) point at which a person notices something and becomes annoyed
 
Answer & Explanation Answer: D) point at which a person notices something and becomes annoyed

Explanation:
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