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Class 12 Physics
Current Electricity
Quiz 3
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An electric heating element consumes 500 W, when connected to a 100 V line. If the line voltage becomes 150 V, the power consumed Will be:
0%
500 W
0%
750 W
0%
1000 W
0%
1125 W
Explanation
750 W
A uniform w ire connected across a supply produces heat H per second. If wire is cut into three equal parts and all the parts are connected in parallel across the same supply, the heat produced per second will be :
0%
\(\frac{H}{9}\)
0%
9 H
0%
3 H
0%
\(\frac{H}{3}\)
Explanation
\(\frac{H}{3}\)
In India electricity is supplied fordomestic use at 220 V. It is supplied at 110 V in U.S.A. If the resistance of a 60 W bulb use in India is R. the resistance of a 60 W bulb for use in USA will be:
0%
2 R
0%
R
0%
R/2
0%
R/4
Explanation
R/4
Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which has higher resistance?
0%
25 W
0%
100 W
0%
both bulbs have equal resistance
0%
resistance of bulbs can not be compared
Explanation
25 W
Potentiometer measures the potential difference more accurately than a voltmeter because:
0%
It has a wire of high resistance
0%
It has a wire of low resistance
0%
It does not draw current from external circuit
0%
It draws heavy current from external circuit
Explanation
It does not draw current from external circuit
In a Wheatstone bridge, the resistance each arm is 10 Ω. If the resistance galvanometers is also 10 Ω, then effective resistance of the bridge will be :
0%
40 Ω
0%
20 Ω
0%
10 Ω
0%
5 Ω
Explanation
10 Ω
The resistance of an aluminium wire is/i. It is stretched to /i times its original length. Its new resistance will be :
0%
nr
0%
n²r
0%
\(\frac{n^2}{r}\)
0%
\(\frac{r}{n^2}\)
Explanation
n²r
A wire P is half the diameter and half the length of a wire Q of similar material. The ratio of resistances of P to that 0 is:
0%
4 : 1
0%
8 : 1
0%
2 : 1
0%
1 : 2
Explanation
2 : 1
What is the resistance across A and B in the network in Fig.?
0%
R
0%
2 R
0%
\(\frac{R}{2}\)
0%
6 R
Explanation
R
When the wires are connected in parallel, the heat produced in the thinner wire is H
1
and that in the thicker wire is H
2
Then:
0%
H
1
= H
2
0%
H
1
< H
2
0%
H
1
> H
2
0%
H
1
≥ H
2
Explanation
H
1
< H
2
Two equal resistors are connected in series across a battery and consume a power of P. If these are connected in parallel, then the' power consumed will be:
0%
2P
0%
4P
0%
\(\frac{p}{4}\)
0%
P
Explanation
4P
Thermo electricity was discovered by:
0%
Joule
0%
Peitier
0%
Thomson
0%
Seebeck
Explanation
Seebeck
Thermo emf is the order of:
0%
10 V
0%
10
-3
V
0%
10
-6
V
0%
10
-12
V
Explanation
10
-6
V
In the following figure represents a balanced Wheatstone bridge circuit. What is the value of X?
0%
15 Ω
0%
20 Ω
0%
25 Ω
0%
30 Ω
Explanation
25 Ω
The charge flowing in a conductor varies with time as :
q = αt \(\frac{1}{2}\) βt² + \(\frac{1}{6}\) γt³
Where α, β, γ are positive constants. Then the initial current (l) is given by the condition :
0%
l = α
0%
l = α²
0%
l = α
-1
0%
None of these
Explanation
l = α
In following figure shows currents in a part of electrical circuit, then the value of/(in ampere) is given by :
0%
0.3 A
0%
0.5 A
0%
1.3 A
0%
None of these
Explanation
0.3 A
In questions 135, when the wires are connected in series, the heat produced in the thinner wire is H
1
and that in the thicker wire is H
2
. Then :
0%
H
1
= H
2
0%
H
1
< H
2
0%
H
1
> H
2
0%
None of the above
Explanation
H
1
> H
2
0 h : 0 m : 1 s
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