Current Electricity Test

Result

Current Electricity Test - 153

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Weekly Quiz Competition

Question 1
4 / -1

A 10 ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

A
1310 W

B
670 W

C
810 W

D
1210 W

Solution
Question 2
4 / -1

Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then

A
Both draw the same current

B
A draws more current than B

C
B draws more current than A

D
Current drawn are in the ratio of their resistances

Solution
Question 3
4 / -1

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

A
Zero

B
10 Ω

C
1 Ω

D
0.10 Ω

Solution
Question 4
4 / -1

Two wires \'A\' and ‘B\' of the same material have their lengths in the ratio 1 : 2 and radii in the ratio 2 : 1. The two wires are connected in parallel across a battery. The ratio of the heat produced in \'A\' to the heat produced in ‘B\' for the same time is

A
1 : 2

B
2 : 1

C
1 : 8

D
8 : 1

Solution
Question 5
4 / -1

A heater draws a current of 2A when connected to a 250 V source. The rate of energy dissipation is

A
500 W

B
1000 W

C
250 W

D
125 W

Solution
Question 6
4 / -1

A bulb rated at (100 W - 200 V) is used on a 100V line. The current in the bulb is

A

B

C

D
2 amp

Solution
Question 7
4 / -1

A current i passes through a wire of length l, radius of cross-section r and resistivity ρ. The rate of heat generation is

A

B

C

D

Solution
Question 8
4 / -1

Which of the following is not equal to watt?

A
(Amp)² × ohm

B
Amp/Volt

C
Amp × Volt

D
Joule/sec
Question 9
4 / -1

If three bulbs 60 W, 100 W and 200 W are connected in parallel, then

A
200 W bulb will glow more

B
60 W bulb will glow more

C
100 W bulb will glow more

D
All the bulbs will glow equally

Solution
Question 10
4 / -1

If two wires having resistances R and 2 R both are joined in series and in parallel, then ratio of heat generated in this situation, applying the same voltage is

A
2 : 1

B
1 : 2

C
2 : 9

D
9 : 2

Solution