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 ______.

(a)

14 A

(b)

8 A

(c)

10 A

(d)

12 A

There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?

(a)

1.5 Ω

(b)

2.5 Ω

(c)

3.5 Ω

(d)

4.5 Ω

The colour code on a carbon resistor is red - red - black. The resistance of the resistor is ___________.

(a)

\(2.2\Omega \)

(b)

\(22\Omega \)

(c)

\(220\quad 2.2\Omega \)

(d)

\(2.2k\Omega \)

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?

(a)

1.4 mm

(b)

2.8 mm

(c)

4.2 mm

(d)

5.6 mm

Five 3 resistances are arranged in a polygon (5 sides). What is the resistance between any two corners?

(a)

\(2.4\Omega \)

(b)

\(3\Omega \)

(c)

\(9\Omega \)

(d)

\(5\Omega \)

Kirchoff's I law i.e, \(\Sigma i=0\) at a junction, deals with the conservation of ______________.

(a)

charge

(b)

energy

(c)

momentum

(d)

angular momentum

Peltier effect is the converse of _____________.

(a)

Joule effect

(b)

Raman effect

(c)

Thomson effect

(d)

Seebeck effect

Nichrome wire is used as the heating element because it has _____________.

(a)

low specific resistance

(b)

low melting point

(c)

high specific resistance

(d)

high specific resistance

The equivalent resistance between A and B in the figure is

(a)

\(15\Omega \)

(b)

\(7.5\Omega \)

(c)

\(25\Omega \)

(d)

\(30\Omega \)

For which of the following substances, resistance decreases with temperature?

(a)

copper

(b)

platinum

(c)

mercury

(d)

carbon

The direction of conventional current is taken as the direction of flow of

(a)

positive charges

(b)

same direction of flow of electron

(c)

opposite to positive charges

(d)

all of these

The resistance of mercury is "0" when its temperature is reduced to_____

(a)

4.2°C

(b)

2.4°K

(c)

4.2 K

(d)

-268.8 K

2A and 3A currents are passed through the heating element of an electrical iron box. The ratio of quantity of heat evolved is_________

(a)

2:3

(b)

3:2

(c)

4:9

(d)

9:4

The tolerance of sliver ring in resistors is_________

(a)

5%

(b)

10%

(c)

20 %

(d)

2 %

How many electrons constitute current of one ampere?

(a)

6.35 x 10^-19

(b)

6.28 x 10¹⁸

(c)

6.28 x 10²⁰

(d)

6.25 x 10¹⁸

The unit of current density is________

(a)

Am^-2

(b)

Am²

(c)

A²m-²

(d)

A^-2m^-2

The specific resistance of silver is________

(a)

1.7 x 10^-8\(\Omega m\)

(b)

1.8 x 10^-7\(\Omega m\)

(c)

1.6 x 10⁸\(\Omega m\)

(d)

16 x 10^-9\(\Omega m\)

The electrical resistivity drops to zero for__________

(a)

conductors

(b)

insulators

(c)

super conductors

(d)

semiconductors

For super conductors, the magnetic flux lines are________

(a)

included

(b)

excluded

(c)

0

(d)

maximum

Super conductors can be used as storage elements in_________

(a)

TV

(b)

camera

(c)

computers

(d)

computers

The tolerance of the resistors are represented by______

(a)

Silver - 10%, Gold - 5%, Red - 2%, Brown - 1%

(b)

Silver - 1%, Gold - 2%, Red - 5%, Brown - 10%

(c)

Silver - 1%, Gold - 10%, Red - 5%, Brown - 2%

(d)

Both (a) and (c)

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____________

(a)

0.1\(\Omega \)

(b)

1\(\Omega \)

(c)

2\(\Omega \)

(d)

1.33\(\Omega \)

Ohm's law is applicable only for_______________

(a)

complicated circuits

(b)

primary circuits

(c)

simple circuits

(d)

secondary circuits

In the case of Wheatstone's Bridge the bridge balance condition will be obtained only when____

(a)

the current through the galvanometer is maximum

(b)

the current through the galvanometer is minimum

(c)

the current through the galvanometer is zero

(d)

the current through the galvanometer is infinity

In the case of meter bridge manganin wire is used because it has_________

(a)

low temperature coefficient of resistance

(b)

high temperature coefficient of resistance

(c)

temperature coefficient of resistance is zero

(d)

temperature coefficient of resistance is maximum