# 12th Class Physics MCQS Chapter 4

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Lenz’s law presented in
1934
1834
1826
1836

Commutator was invented by:
William tells
William Sturgeon
William bills
William Gates

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?
15 V
90 V
45 V
300 V

Energy density of an inductor is:
Um = 2??/B
Um = 2B2/??
UM=1/2??/B2
UM = 1/2B2/??

A current generator device converts:
Both b and c
Mechanical energy into chemical energy
Chemical energy into electrical energy
Mechanical energy into electrical energy

If the north pole of a magnet moves away from a metallic ring
First clockwise and then anticlockwise
Clockwise
Anticlockwise
None of above

The unit of induced emf is
Ampere
Volt
Both (b) and (c)
Joule/coulomb

The magnitude of back emf:
Remains same
Decreases with speed of motor
Increases with sped of motor
None of above

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:
First anticlockwise and then Clockwise
Antoclockwise
First Clockwise and then Antoclockwise
Clockwise

Which of the following quantities remain constant in step up transformer?
Power
Current
Heat
Voltage

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