class 10 Physics mcq questions pdf For UPSC | SSC | Rail | RRB | State PSC P25

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Page 25

80059241. Speed of sound is the greatest in :

A

Water

B

Air

C

Glass

D

Glycerine

C

Correct Answer: C. Glass

80092242. The term 'Isoneph' indicates the lines of equal

A

cloudiness

B

salinity

C

rainfall

D

pressure

A

Correct Answer: A. cloudiness

80055243. Optic fibers are used in

A

CAT scans

B

X-ray photos

C

Ultrasound scans

D

Endoscopy

D

Correct Answer: D. Endoscopy

80098244. Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are traveling in the opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is :

A

1.0

B

1.2

C

L5

D

2.0

A

Correct Answer: A. 1.0

80072245. The energy stored in a watch spring is

A

kinetic energy

B

potential energy

C

heat energy

D

chemical energy

B

Correct Answer: B. potential energy

80036246. if the length of a simple pendulum is halved then its period of oscillation is

A

doubled

B

halved increased by a factor

C

increased by a factor √2

D

decreased by a factor √2

D

Correct Answer: D. decreased by a factor √2

80090247. The swing of a spinning cricket ball in the air can be explained on the basis of

A

Sudden change in wind direction.

B

Buoyancy of air.

C

Turbulence caused by wind.

D

Bernoulli's theorem.

C

Correct Answer: C. Turbulence caused by wind.

80028248. Flemings right-hand rule is used to find the direction of the

A

Alternate current

B

Direct current

C

Induced current

D

Actual current

C

Correct Answer: C. Induced current

80046249. Lambert's law is related to

A

Reflection

B

Refraction

C

Interference

D

Illumination

D

Correct Answer: D. Illumination

80141250. Which one of the following is used for sunglasses?

A

Pyrex glass

B

Flint glass

C

Crooks glass

D

Crystal glass

C

Correct Answer: C. Crooks glass

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