Current Electricity Test

Result

Current Electricity Test - 151

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Weekly Quiz Competition

Question 1
4 / -1

The value of internal resistance of an ideal cell is

A
Zero

B
0.5 Ω

C
1 Ω

D
Infinity
Question 2
4 / -1

Electric power is transmitted over long distances through conducting wires at high voltage because

A
High voltage travels faster

B
Power loss is large

C
Power loss is less

D
Generator produce electrical energy at a very high voltage

Solution
Question 3
4 / -1

A coil develops heat of 800 cal/sec. When 20 volts is applied across its ends. The resistance of the coil is (1 cal = 4.2 joule)

A
1.2 Ω

B
1.4 Ω

C
0.12 Ω

D
0.14 Ω

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

The internal resistance of a primary cell is 4 ohm. It generates a current of 0.2 amp in an external resistance of 21 ohm. The rate at which chemical energy is consumed in providing the current is

A
0.42 J/s

B
0.84 J/s

C
5 J/s

D
1 J/s

Solution
Question 6
4 / -1

A heating coil is labelled 100 W, 220 V. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is

A
200 J

B
400 J

C
25 J

D
50 J
Question 7
4 / -1

Which of the following is not a correct statement

A
Resistivity of electrolytes decreases on increasing temperature

B
Resistance of mercury falls on decreasing its temperature

C
When joined in series a 40 W bulb glows more than a 60 W bulb

D
Resistance of 40 W bulb is less than the resistance of 60 W bulb
Question 8
4 / -1

Three electric bulbs with same voltage ratings of 110 volts but wattage ratings of 40, 60 and 100 watts respectively are connected in series across a 220 volt supply line. If their brightness are B₁, B₂, B₃ respectively, then

A
B₁ > B₂ > B₃

B
B₁ > B₂ < B₃

C
B₁ = B₂ = B₃

D
Bulbs will burn out due to the high voltage supply

Solution
Question 9
4 / -1

An electric iron draws 5 amp, a TV set draws 3 amp and refrigerator draws 2 amp from a 220 volt main line. The three appliances are connected in parallel. If all the three are operating at the same time, the fuse used may be of

A
20 amp

B
5 amp

C
15 amp

D
10 amp
Question 10
4 / -1

Two bulbs of 500 watt and 200 watt are manufactured to operate on 220 volt line. The ratio of heat produced in 500 W and 200 W, in two cases, when firstly they are joined in parallel and secondly in series, will be

A

B

C

D

Solution