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Physics 10 Chapter 15 - Electromagnetism - 18
1.
Transformers work only with.................?
a) Batteries
b) D.C
c) Thermocouples
d) A.C
2.
Soft iron is used in transformer to.......................?
a) Decrease and increase flux
b) Increase flux
c) Keep same flux
d) Decrease flux
3.
Usage of transformer is common because they change voltage with relatively little loss of................?
a) Power
b) Voltage
c) Energy
d) Current
4.
Why main power is supplied as alternating current?
a) Because transformers work only with D.C
b) Because transformers work only with A.C
c) Because it is easy
d) Because transformers don’t work with A.C
5.
What is the magnetic effect of current called?
a) Basic electronics
b) Electronics
c) Magnet
d) Electromagnet
6.
In which of the following devices, electromagnet is used?
a) (d) Electric bell
b) (b) Relay
c) (a) Both b and d
d) (c) AND gates
7.
What is the device called that is used to control a large current with the help of a small current?
a) AND gate
b) Electric bell
c) Magnets
d) Relay
8.
The relay is used to control a large current with the help of.....................?
a) Small current
b) Large current
c) Large voltage
d) Small voltage
9.
What is used to control a large current with the help of small current?
a) Circuit
b) Relay
c) Capacitor
d) Resistor
10.
The relay is used to control ....................with the help of a small current?
a) Small voltage
b) Large voltage
c) Small current
d) Large current
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