PG TRB Physics Model Question Paper with Answer - 4

Question: 16

In a transistor

(A) Both the emitter and the collector are equality doped

(B) Emitter is more heavily doped than the collector

(C) The base is made very thin and is lightly doped

(D) Both (b) and (c)

Ans: D

Both (b) and (c)

Question: 17

Microwave oven consumes less power due to

(A) Large frequency as well as wavelength of radiation

(B) Small frequency as well as wavelength of radiation

(C) Small frequency of radiation

(D) Short wavelength of radiation

Ans: D

Short wavelength of radiation

Question: 18

Soap helps in the cleaning of cloths because

(A) of some other reason

(B) it absorbs the dirt

(C) it reduces surface tension

(D) it increases surface tension

Ans: C

it reduces surface tension

Question: 19

A digital signal possesses

(A) Only four discrete values

(B) Continuously varying values

(C) Only two discrete values

(D) None of the above

Ans: C

Only two discrete values

Question: 20

By increasing the number of turns in the coil, the strength of the magnetic field

(A) Remains unchanged

(B) Decreases

(C) Increases

(D) First increases than decreases

Ans: C

Increases

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