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Published on: 05/11/2019
Current Electricity
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
In the case of meter bridge manganin wire is used because it has_________
low temperature coefficient of resistance
high temperature coefficient of resistance
temperature coefficient of resistance is zero
temperature coefficient of resistance is maximum
2.
In the case of Wheatstone's Bridge the bridge balance condition will be obtained only when____
the current through the galvanometer is maximum
the current through the galvanometer is minimum
the current through the galvanometer is zero
the current through the galvanometer is infinity
3.
Ohm's law is applicable only for_______________
complicated circuits
primary circuits
simple circuits
secondary circuits
4.
A cell of emf 2.2V sends a current of 0.2A through a resistance of 10 n. The internal resistance of the cell is____________
0.1\(\Omega \)
1\(\Omega \)
2\(\Omega \)
1.33\(\Omega \)
5.
The tolerance of the resistors are represented by______
Silver - 10%, Gold - 5%, Red - 2%, Brown - 1%
Silver - 1%, Gold - 2%, Red - 5%, Brown - 10%
Silver - 1%, Gold - 10%, Red - 5%, Brown - 2%
Both (a) and (c)
6.
Super conductors can be used as storage elements in_________
TV
camera
computers
computers
7.
For super conductors, the magnetic flux lines are________
included
excluded
0
maximum
8.
The electrical resistivity drops to zero for__________
conductors
insulators
super conductors
semiconductors
9.
The specific resistance of silver is________
1.7 x 10-8\(\Omega m\)
1.8 x 10-7\(\Omega m\)
1.6 x 108\(\Omega m\)
16 x 10-9\(\Omega m\)
10.
The unit of current density is________
Am-2
Am2
A2m-2
A-2m-2
11.
How many electrons constitute current of one ampere?
6.35 x 10-19
6.28 x 1018
6.28 x 1020
6.25 x 1018
12.
The tolerance of sliver ring in resistors is_________
5%
10%
20 %
2 %
13.
2A and 3A currents are passed through the heating element of an electrical iron box. The ratio of quantity of heat evolved is_________
2:3
3:2
4:9
9:4
14.
The resistance of mercury is "0" when its temperature is reduced to_____
4.2°C
2.4°K
4.2 K
-268.8 K
15.
The direction of conventional current is taken as the direction of flow of
positive charges
same direction of flow of electron
opposite to positive charges
all of these
16.
For which of the following substances, resistance decreases with temperature?
copper
platinum
mercury
carbon
17.
The equivalent resistance between A and B in the figure is
\(15\Omega \)
\(7.5\Omega \)
\(25\Omega \)
\(30\Omega \)
18.
Nichrome wire is used as the heating element because it has _____________.
low specific resistance
low melting point
high specific resistance
high specific resistance
19.
Peltier effect is the converse of _____________.
Joule effect
Raman effect
Thomson effect
Seebeck effect
20.
Kirchoff's I law i.e, \(\Sigma i=0\) at a junction, deals with the conservation of ______________.
charge
energy
momentum
angular momentum
21.
Five 3 resistances are arranged in a polygon (5 sides). What is the resistance between any two corners?
\(2.4\Omega \)
\(3\Omega \)
\(9\Omega \)
\(5\Omega \)
22.
A square aluminum rod is 1 m long and 5 mm on edge. What must be the radius of another aluminum rod whose length is 1 m and which has the same resistance as that of square Aluminum rod?
1.4 mm
2.8 mm
4.2 mm
5.6 mm
23.
The colour code on a carbon resistor is red - red - black. The resistance of the resistor is ___________.
\(2.2\Omega \)
\(22\Omega \)
\(220\quad 2.2\Omega \)
\(2.2k\Omega \)
24.
There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?
1.5 Ω
2.5 Ω
3.5 Ω
4.5 Ω
25.
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW are connected. The voltage of electric mains is 220 V. The maximum capacity of the main fuse of the building will be ______.
14 A
8 A
10 A
12 A
1.
(c)
temperature coefficient of resistance is zero
2.
(c)
the current through the galvanometer is zero
3.
(c)
simple circuits
4.
(b)
1\(\Omega \)
5.
(a)
Silver - 10%, Gold - 5%, Red - 2%, Brown - 1%
6.
(c)
computers
7.
(b)
excluded
8.
(c)
super conductors
9.
(d)
16 x 10-9\(\Omega m\)
10.
(a)
Am-2
11.
(d)
6.25 x 1018
12.
(b)
10%
13.
(c)
4:9
14.
(c)
4.2 K
15.
(a)
positive charges
16.
(d)
carbon
17.
(b)
\(7.5\Omega \)
18.
(c)
high specific resistance
19.
(d)
Seebeck effect
20.
(a)
charge
21.
(a)
\(2.4\Omega \)
22.
(b)
2.8 mm
23.
(b)
\(22\Omega \)
24.
Rs = 3 + 2.5 + P = 5.5 + P
V = 9 V, I = 1.0 A
Rs = \(\frac{V}{I}=\frac{9}{1}= 9 \Omega\)
∴ 9 = 5.5 + P
∴ P = 9 - 5.5 = 3.5 Ω
25.
Total power = 15 x 40 + 5 x 100 + 5 x 80 + 1000
= 600 + 500 + 400 + 1000
= 2500 W
P = VI, V = 220 V
\(I=\frac{P}{V}=\frac{2500}{220}=11.363 \ A\)
≃ 12 A
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