Polytechnic TRB Physics Model Question Paper with Answer Keys - 5

Question: 21

Telescope are placed in space to view distant galaxies primarily to

(A) avoid steering the telescope against the Earth’s motion

(B) avoid light pollution from the Earth’s populated areas 

(C) avoid the absorption of light or other radiations in the atmosphere of the Earth

(D) get closer to the observed objects

Ans: B

avoid light pollution from the Earth’s populated areas 

Question: 22

The cooling by a desert cooler is based on

(A) Air rehydration

(B) Hot air replacement

(C) Evaporative cooling

(D) Evaporative cooling

Ans: B

Hot air replacement

Question: 23

Domestic electrical wiring is basically a

(A) Parallel connection

(B) Series connection

(C) Combination of series and parallel connections

(D) Series connection within each room and parallel connection elsewhere

Ans: A

Parallel connection

Question: 24

The mass of the body is different from its weight because

(A) mass is a variable quantity, whereas weight is constant

(B) mass is a measure of the quantity of matter, whereas weight is force

(C) mass is constant but weight increases as the body moves from the Poles to the equator

(D) mass varies very little at different places, whereas weight varies a lot

Ans: B

mass is a measure of the quantity of matter, whereas weight is force

Question: 25

Clinical thermometer measure temperature in very short range of

(A) 10°

(B) 15°

(C) 20°

(D) 25°

Ans: A

10°

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