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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