Current Electricity Test

Result

Current Electricity Test - 154

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Weekly Quiz Competition

Question 1
4 / -1

Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5 W. The rate of heat dissipation in A is

A
10 W

B
5 W

C
20 W

D
None of these

Solution
Question 2
4 / -1

An electric bulb is designed to draw power P₀ at voltage V₀. If the voltage is V it draws a power P. Then

A

B

C

D

Solution
Question 3
4 / -1

An external resistance R is connected to a battery of e.m.f. V and internal resistance r. The joule heat produced in resistor R is maximum when R is equal to

A
r

B

C
2r

D
Infinitely large
Question 4
4 / -1

The amount of heat produced in a resistor when a current is passed through it can be found using

A
Faraday's Law

B
Kirchhoff's Law

C
Laplace's Law

D
Joule's Law
Question 5
4 / -1

Two wires having resistance of 2 Ω and 4 Ω are connected to same voltage. Ratio of heat dissipated at resistance is

A
1 : 2

B
4 : 3

C
2 : 1

D
5 : 2

Solution
Question 6
4 / -1

n identical bulbs, each designed to draw a power p from a certain voltage supply, are joined in series across that supply. The total power which they will draw is

A
p/n²

B
p/n

C
p

D
np
Question 7
4 / -1

If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be

A
9 : 4

B
4: 3

C
3 : 8

D
3 : 2

Solution
Question 8
4 / -1

A fuse wire with radius 1 mm blows at 1.5 amp. The radius of the fuse wire of the same material to blow at 3 A will be

A
4^1/3 mm

B
3^1/4 mm

C
2^1/2 mm

D
3^1/2 mm

Solution
Question 9
4 / -1

Two bulbs of 100 W and 200 W working at 220 volt are joined in series with 220 volt supply. Total power consumed will be approximately

A
65 watt

B
33 watt

C
300 watt

D
100 watt

Solution
Question 10
4 / -1

How many calories of heat will be produced approximately in a 210 watt electric bulb in 5 minutes

A
80000 cal

B
63000 cal

C
1050 cal

D
15000 cal

Solution