Current Electricity Test

Result

Current Electricity Test - 34

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Weekly Quiz Competition

Question 1
4 / -1

In the absence of applied potential, the electric current flowing through a metallic wire is zero because

A
The electrons remain stationary

B
The electrons are drifted in random direction with a speed of the order of 10^–2cm/s

C
The electrons move in random direction with a speed of the order close to that of velocity of light

D
Electrons and ions move in opposite direction
Question 2
4 / -1

Dimensions of a block are 1 cm × 1 cm × 100 cm. If specific resistance of its material is 3 × 10^–7ohm-m, then the resistance between the opposite rectangular faces is

A
3 × 10^–9Ω

B
3 × 10^–7Ω

C
3 × 10^–5Ω

D
3 × 10^–3Ω

Solution
Question 3
4 / -1

In the above question, the resistance between the square faces is

A
3 × 10^–9Ω

B
3 × 10^–7Ω

C
3 × 10^–5Ω

D
3 × 10^–3Ω

Solution
Question 4
4 / -1

When an electrical appliance is switched on, it responds almost immediately, because

A
The electrons in the connecting wires move with the speed of light

B
The electrical signal iscarried by electromagnetic waves moving with the speed of light

C
The electrons move with speed which is close to but less than speed of light

D
The electron are stagnant
Question 5
4 / -1

The resistance of a wire of uniform diameter d and length L is R. The resistance of another wire of the same material but diameter 2d and length 4L will be

A
2R

B
R

C
R/2

D
R/4

Solution
Question 6
4 / -1

It is easier to start a car engine on a hot day than on a cold day. This is because the internal resistance of the car battery

A
Decreases with rise in temperature

B
Increases with rise in temperature

C
Decreases with a fall in temperature

D
Does not change with a change in temperature

Solution
Question 7
4 / -1

5 ampere of current is passed through a metallic conductor. The charge flowing in one minute in coulomb will be

A
5

B
12

C
1/12

D
300

Solution
Question 8
4 / -1

A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it

A
Increases, thermal velocity of the electron increases

B
Decreases, thermal velocity of the electron increases

C
Increases, thermal velocity of the electron decreases

D
Decreases, thermal velocity of the electron decreases

Solution
Question 9
4 / -1

An electric wire is connected across a cell of e.m.f. E. The current I is measured by an ammeter of resistance R. According to ohm\'s law

A
E = I²R

B
E = IR

C
E = R/I

D
E = I/R
Question 10
4 / -1

The resistances of a wire at temperatures t° C and 0° C are related by

A

B

C

D