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Class 12 Physics
Current Electricity
Quiz 1
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The speed at which tjie current travels in a conductor is nearly:
0%
3 × 10
4
ms
-1
0%
3 × 10
6
ms
-1
0%
3 × 10
8
ms
-1
0%
3 × 10
10
ms
-1
Explanation
3 × 10
4
ms
-1
The resistance of a human body is about:
0%
12 Ω
0%
120 Ω
0%
12 KΩ
0%
120 MΩ
Explanation
12 KΩ
The number of electrons that constitute 1 A of current is:
0%
6.25 × 10
16
0%
6.25 × 10
17
0%
6.25 × 10
18
0%
6.25 × 10
19
Explanation
6.25 × 10
18
How many different resistances are possible with two equal resistors?
0%
2
0%
3
0%
4
0%
5
Explanation
3
Given three equal resistors, how many different combinations (taken all of them together) can be made?
0%
3
0%
4
0%
5
0%
6
Explanation
4
Specific resistance of ali metals is mostly affected by:
0%
temperature
0%
pressure
0%
magnetic field
0%
volume
Explanation
temperature
The example of a non-ohmic resistance is:
0%
copper wire
0%
fi lament lamp
0%
carbon resistor
0%
diode
Explanation
diode
If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area (a) shall respectively be :
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L, 2A
0%
\(\frac{L}{2}\), 2A
0%
2L, 2A
0%
2l, \(\frac{A}{2\)
Explanation
\(\frac{L}{2}\), 2A
The specific resistance of a rod of copper as compared to that of thin wire of copper is :
0%
less
0%
more
0%
same
0%
depends upon the length and area of cross-section of the wire
Explanation
same
A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :
0%
\(\frac{2}{3}\) Ω
0%
\(\frac{3}{2}\) Ω
0%
\(\frac{1}{2}\) Ω
0%
\(\frac{1}{3}\) Ω
Explanation
\(\frac{2}{3}\) Ω
The length of a conductor is halved. Its resistance will be :
0%
halved
0%
doubled
0%
unchanged
0%
quadrupled
Explanation
halved
In the above question, the conductance:
0%
halved
0%
doubled
0%
unchanged
0%
quadrupled
Explanation
doubled
Siemen is the unit of:
0%
resistance
0%
conductance
0%
specific conductance
0%
None of these
Explanation
conductance
How much electric energy is consumed by a 100 W lamp used for 6 hours everyday for 30 days?
0%
18 kJ
0%
18 kWh
0%
1.8 J
0%
None of these
Explanation
18 kWh
Suppose H
1
is the heat generated per second in the filament of a 100 W, 250 V lamp and H
2
is the heat generated in the filament of a 200 W, 250 V lamp. Then H
1
/H
2
is equal to:
0%
1
0%
2
0%
\(\frac{1}{2}\)
0%
\(\frac{1}{4}\)
Explanation
\(\frac{1}{2}\)
Two wires of copper are of the same length but'have different diameters. When they are connected in series across a battery, the heat generated is H
1
When connected in parallel across the same battery, the heat generated during the same time is H
2
Then :
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H
1
= H
2
0%
H
1
< H
2
0%
H
1
> H
2
0%
H
1
> H
2
Explanation
H
1
< H
2
Kirchhoffs first and second laws for electrical circuits are consequences of:
0%
conservation of energy
0%
conservation of electrical charge and energy respectively
0%
conservation of electric charge
0%
neither conservation of energy nor electric charge
Explanation
conservation of electrical charge and energy respectively
A 5 A fuse wire can with stand a maximum power of 1 W in circuit. The resistance of the fuse wire is:
0%
0.2 Ω
0%
5 Ω
0%
0.4 Ω
0%
0.04 Ω
Explanation
0.04 Ω
The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
0%
resistance will be doubled and specific resistance will be halved
0%
resistance will be halved and specific resistance will remain uncharged
0%
resistance will be halved and the specific resistance will be doubled
0%
resistance and specific resistance will both remain uncharged
Explanation
resistance will be halved and specific resistance will remain uncharged
A galvanometer acting as a volt meter will have with its coil.
0%
a high resistance in parallel
0%
a high resistance in series
0%
a low resistance in parallel
0%
a low resistance in series
Explanation
a high resistance in series
0 h : 0 m : 1 s
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