Current Electricity Test

Result

Current Electricity Test - 149

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Weekly Quiz Competition

Question 1
4 / -1

If current in an electric bulb changes by 1%, then the power will change by

A
1%

B
2%

C
4%

D

Solution
Question 2
4 / -1

Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance R = 0.5 ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is

A
1.28 watt

B
2.0 watt

C
8/9 watt

D
3.2 watt

Solution
Question 3
4 / -1

A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire

A
Will be doubled

B
Will be halved

C
Will remain the same

D
Will be quadrupled

Solution
Question 4
4 / -1

The heating coils rated at 220 volt and producing 50 cal/sec heat are available with the resistances 55Ω, 110Ω, 220Ω and 440Ω. The heater of maximum power will be of

A
440Ω

B
220Ω

C
110Ω

D
55Ω

Solution
Question 5
4 / -1

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use

A
400Ω

B
200Ω

C
40Ω

D
20Ω

Solution
Question 6
4 / -1

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

A
One fourth

B
Halved

C
Doubled

D
Four times

Solution
Question 7
4 / -1

An electric heater kept in vacuum is heated continuously by passing electric current. Its temperature

A
Will go on rising with time

B
Will stop after sometime as it will loose heat to the surroundings by conduction

C
Will rise for sometime and there after will start falling

D
Will become constant after sometime because of loss of heat due to radiation
Question 8
4 / -1

Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to

A

B

C
R

D

Solution
Question 9
4 / -1

A coil takes 15 min to boil a certain amount of water, another coil takes 20 min for the same process. Time taken to boil the same amount of water when both coils are connected in series

A
5 min

B
8.6 min

C
35 min

D
30 min

Solution
Question 10
4 / -1

An electric bulb of 100 watt is connected to a supply of electricity of 220 V . Resistance of the filament is

A
484Ω

B
100Ω

C
22000Ω

D
242Ω

Solution