Physics - Questions and Answers, General Study (GK)

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Physics - Questions and AnswersPage 27

261.

When a temperature is gradually decreased, the specific heat of substance is

(a)increased

(b)decreased

(c)remain unchanged

(d)none of the above

Comment

Answer is: CNA

262.

Which one of the following substances has greatest specific heat?

(a)Water

(b)Mercury

(c)Iron

(d)Copper

Comment

Answer is: ANA

263.

A liquid boils when its vapour pressure equals

(a)the atmosphere pressure

(b)the pressure of 76.0 cm column of mercury

(c)the critical pressure

(d)the dew point of the surroundings

Comment

Answer is: ANA

264.

Dry ice is

(a)ice cube

(b)sodium chloride

(c)liquid nitrogen

(d)solid carbon dioxide

Comment

Answer is: DNA

265.

When we rub our palms they gets heated but to a maximum temperature because

(a)heat is absorbed by our palm

(b)heat is lost in the environment

(c)produced of heart is stopped

(d)none of these

Comment

Answer is: BNA

266.

Which of the following has maximum specific heat?

(a)Water

(b)Alcohol

(c)Glycerine

(d)Oil

Comment

Answer is: ANA

267.

Expansion during heating

(a)occurs only in solids

(b)increases the weight of a material

(c)decrease the density of a material

(d)occurs of the same rate after liquids and solids

Comment

Answer is: CNA

268.

Mud houses are cooler in summer and warmer in winter because

(a)Mud is superconductor of heat

(b)Mud is good conductor of heat

(c)Mud is bad conductor of heat

(d)none of the above

Comment

Answer is: CNA

269.

A body, which emits radiations of all possible wavelengths is known as

(a)good conductor

(b)partial radiator

(c)absorber of photons

(d)perfectly black body

Comment

Answer is: DNA

270.

When red glass is heated in dark room will seem?

(a)Green

(b)Purple

(c)Black

(d)Yellow

Comment

Answer is: ANA

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Physics - Questions and AnswersPage 27

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