Current Electricity Test

Result

Current Electricity Test - 32

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

When the length and area of cross-section both are doubled, then its resistance

A
Will become half

B
Will be doubled

C
Will remain the same

D
Will become four times

Solution
Question 2
4 / -1

The resistance of a wire is 20 ohm. It is so stretched that the length becomes three times, then the newresistance of the wire will be

A
6.67 ohm

B
60.0 ohm

C
120 ohm

D
180.0 ohm

Solution
Question 3
4 / -1

The resistivity of a wire

A
Increases with the length of the wire

B
Decreases with the area of cross-section

C
Decreases with the length and increases with the cross-section of wire

D
None of the above statement is correct
Question 4
4 / -1

Ohm\'s law is true

A
For metallic conductors at low temperature

B
For metallic conductors at high temperature

C
For electrolytes when current passes through them

D
For diode when current flows
Question 5
4 / -1

Drift velocity v_d varies with the intensity of electricfield as per the relation

A

B

C

D

Solution
Question 6
4 / -1

Which of the following statement is correct?

A
Electric field is zero on the surface of currentcarrying wire

B
Electric field is non-zero on the axis of hollow current carrying wire

C
Surface integral of magnetic field for any closed surface is equal to μ₀ times of total algebraic sum of current which are crossing through the closed surface.

D
None of the above
Question 7
4 / -1

In a conductor 4 coulomb of charge flows for 2 seconds. The value of electric current will be

A
4 volt

B
4 ampere

C
2 ampere

D
2 volt

Solution
Question 8
4 / -1

The specific resistance of a wire is ρ, its volume is 3m³ and its resistance is 3 ohm, then its length will be

A

B

C

D

Solution
Question 9
4 / -1

62.5 × 10¹⁸ electrons per second are flowing through awire of area of cross-section 0.1 m², the value of current flowing will be

A
1A

B
0.1 A

C
10 A

D
0.11 A

Solution
Question 10
4 / -1

In a closed circuit, the current I (in ampere) at an instant of time t (in second) is given by I = 4 – 0.08t. The number of electrons flowing in 50 s through thecross-section of the conductor is

A
1.25 × 10¹⁹

B
6.25 × 10²⁰

C
5.25 × 10¹⁹

D
2.55 × 10²⁰

Solution