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6. Copper wire cannot be used as Fuse wire as 1
a) It takes more time to melt due its melting point
b) It has more resistance.
c) It has less resistance.
d) It is an insulator.
7 Fuse wire is made from an alloy of 1
a) Copper and lead
b) Tin and lead
c) Tin and Chromium
d) Iron and aluminum
8 Choose the odd one out. 1
a) Electric fuse
b) Cartridge fuse
c) MCB
d) Ceramic Fuse
9 Assertion: MCB is used more nowadays. 1
Reason: Fuse is a safety device.
10 Assertion: MCB and Fuse prevents household’s appliances in case of electrical 1
faults.
Reason: They extinguish the fire in house.
Subjective Questions:
11 Write two advantages of MCB over Fuse. 2
12 Define the following: 2
a) Short circuit
b) Overloading
13 Write three factors on which heating effect of current depends. 3
14 a) Define heating effect of current. 3
b) Name two appliances based heating effect of current.
