Physics - Section 1 (9)

Directions to Solve

Physics - Section 1

65.

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

A.	Pressure and Young's modules
B.	Planck's constant and Angular momentum
C.	Impulse and moment of force
D.	Force and rate of change of linear momentum

Answer: Option C

Explanation:

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66.

Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

A.	will overflow
B.	will not rise
C.	depressed
D.	change its meniscus

Answer: Option B

Explanation:

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67.

Metals are good conductors of electricity because

A.	they contain free electrons
B.	the atoms are lightly packed
C.	they have high melting point
D.	All of the above

Answer: Option A

Explanation:

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68.

Planets do not twinkle because

A.	they emit light of a constant intensity
B.	their distance from the earth does not change with time
C.	they are very far away from the earth resulting in decrease in intensity of light
D.	they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

Answer: Option D

Explanation:

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69.

Pa(Pascal) is the unit for

A.	thrust
B.	pressure
C.	frequency
D.	conductivity

Answer: Option B

Explanation:

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70.

Stars appears to move from east to west because

A.	all stars move from east to west
B.	the earth rotates from west to east
C.	the earth rotates from east to west
D.	the background of the stars moves from west to east

Answer: Option B

Explanation:

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71.

Light from the Sun reaches us in nearly

A.	2 minutes
B.	4 minutes
C.	8 minutes
D.	16 minutes

Answer: Option C

Explanation:

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72.

Mirage is due to

A.	unequal heating of different parts of the atmosphere
B.	magnetic disturbances in the atmosphere
C.	depletion of ozone layer in the atmosphere
D.	equal heating of different parts of the atmosphere

Answer: Option A

Explanation:

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