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Physics 10 Chapter 15 - Electromagnetism - 13
1.
Why are walk-through metal detectors installed at airports?
a) For hurdles
b) Are not installed at air ports
c) For safety purposes
d) For decoration
2.
Using which law, mutual induction can be described?
a) Pascal’s law of electronics
b) Faraday’s law of electromagnetic induction
c) Newton’s law of gravitation
d) Newton’s third law of motion
3.
The magnetic field of a coil is identical to the field of a ....................shaped permanent magnet?
a) U-shaped
b) Horse shoe magnet
c) Bar magnet
d) Disk
4.
What is the practical application of mutual induction?
a) Electric motor
b) A.C generator
c) Transformer
d) Washing machine motor
5.
Transformer is the practical application of...........................?
a) Electromagnetic induction
b) Mutual induction
c) Electric motor
d) Pascal’s law
6.
What is the use of transformers?
a) They are used only to decrease DC voltages
b) They are used only to decrease AC voltages
c) They are used to increase or decrease DC voltages
d) They are used to increase or decrease AC voltages
7.
In which of the following devices, transformers are used?
a) Game systems
b) All of these
c) Stereos
d) Printers
8.
What is the symbol for representing number of turns on the primary coil?
a) N(s-p)
b) Np
c) N(p-s)
d) Ns
9.
What is the symbol for representing number of turns on the secondary coil?
a) N(p-s)
b) N(s-p)
c) Np
d) Ns
10.
How many coils a transformer has?
a) two
b) Four
c) Three
d) Five
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