Current Electricity Test

Result

Current Electricity Test - 148

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Weekly Quiz Competition

Question 1
4 / -1

How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)

A
1500

B
5000

C
15

D
150

Solution
Question 2
4 / -1

Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be

A
20 watt

B
60 watt

C
80 watt

D
100 watt

Solution
Question 3
4 / -1

A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across a 220 volt lines. Which electric bulb will glow more brightly?

A
25 watt bulb

B
100 watt bulb

C
First 25 watt and then 100 watt

D
Both with same brightness
Question 4
4 / -1

A resistor R₁ dissipates power P when connected to a certain generator. If the resistor R₂ is put in series with R₁, the power dissipated by R₁

A
Decreases

B
Increases

C
Remains the same

D
Any of the above depending upon the relative values of R₁ and R₂

Solution
Question 5
4 / -1

An electric fan and a heater are marked as 100 watt, 220 volt and 1000 watt, 220 volt respectively. The resistance of the heater is

A
Zero

B
Greater than that of the fan

C
Less than that of the fan

D
Equal to that of the fan

Solution
Question 6
4 / -1

According to Joule\'s law, if the potential difference across a conductor having a material of specific resistance remains constant, then the heat produced in the conductor is directly proportional to

A

B

C

D

Solution
Question 7
4 / -1

Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then

A
X will glow brighter

B
Resistance of Y is greater than X

C
Heat produced in Y will be greater than X

D
Voltage drop in X will be greater than Y

Solution
Question 8
4 / -1

Two identical heaters rated 220 volt, 1000 watt are placed in series with each other across 220 volt lines. If resistance does not change with temperature, then the combined power is

A
1000 watt

B
2000 watt

C
500 watt

D
4000 watt

Solution
Question 9
4 / -1

A railway compartment is lit up by thirteen lamps each taking 2.1 amp at 15 volts. The heat generated per second in each lamp will be

A
4.35 cal

B
5.73 cal

C
7.5 cal

D
2.5 cal

Solution
Question 10
4 / -1

A 5.0 amp current is setup in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by

A
1.08 × 10⁴ J

B
1.08 × 10^–4 volt

C
1.8 × 10⁴ J

D
1.8 × 10⁴ volt

Solution