7000+ TNPSC Group 4 General Science Study Materials Pdf - 1

Question: 1

Which device is used to change the direction of the current in electric motor?

(A) Carbon brush

(B) Coil

(C) Split ring commutator

(D) Permanent magnet

Ans: C

Split ring commutator

Question: 2

The space around a magnet where its influence can be felt is called

(A) Magnetic field

(B) Gravitational field

(C) Electric field

(D) Thermal field

Ans: A

Magnetic field

Question: 3

Which one of the following is not a fundamental unit?

(A) Ampere

(B) Newton

(C) Candela

(D) Second

Ans: B

Newton

Question: 4

Heating effect of current is called

(A) Voltage heating

(B) Coulomb heating

(C) Ampere heating

(D) Joule heating

Ans: D

Joule heating

Question: 5

The size of an air bubble rising up in water

(A) Increases

(B) Decreases

(C) May increase or decrease

(D) Remains same

Ans: A

Increases

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