Physics - Section 1 (3)

Directions to Solve

Physics - Section 1

17.

One watt-hour is equivalent to

A.	6.3 x 10 3 J
B.	6.3 x 10-7 J
C.	3.6 x 10 3 J
D.	3.6 x 10-3 J

Answer: Option C

Explanation:

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18.

Isotopes of an element contain

A.	the same number of protons but different number of neutrons
B.	the same number of neutrons but different number of protons
C.	equal number of protons and electrons
D.	equal number of nucleons

Answer: Option A

Explanation:

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19.

Solar eclipse will take place when

A.	the sun is between the moon and the earth
B.	the earth is between the moon and the sun
C.	the moon is between the sun and the earth
D.	the moon does not lie on the line joining the sun and the earth

Answer: Option C

Explanation:

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20.

ML2T-2 is the dimensional formula for

A.	moment of inertia
B.	pressure
C.	elasticity
D.	couple acting on a body

Answer: Option D

Explanation:

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21.

Stars which appear single to the naked eye but are double when seen through a telescope are

A.	novas and supernovas
B.	binaries
C.	asteroids
D.	quasars

Answer: Option B

Explanation:

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22.

Rainbow is due to

A.	absorption of sunlight in minute water droplets
B.	diffusion of sunlight through water droplets
C.	ionisation of water deposits
D.	refraction and reflection of sunlight by water droplets

Answer: Option D

Explanation:

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23.

On a stationary sail boat, air is blown from a fan attached to the boat. The boat

A.	moves in opposite direction in which the air is blown
B.	does not move
C.	moves in the same direction in which air blows
D.	spins around

Answer: Option B

Explanation:

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24.

Mach number is used in connection with the speed of

A.	sound
B.	aircraft
C.	spacecraft
D.	ships

Answer: Option B

Explanation:

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