Current Electricity Test

Result

Current Electricity Test - 85

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Weekly Quiz Competition

Question 1
4 / -1

At room temperature, copper has free electron density of 8.4 × 10²⁸ per m³. The copper conductor has across-section of 10^–6 m² and carries a current of 5.4 A.The electron drift velocity in copper is

A
400 m/s

B
0.4 m/s

C
0.4 m/s

D
72 m/s

Solution
Question 2
4 / -1

The resistance of a 5 cm long wire is 10 Ω. It is uniformly stretched so that its length becomes 20 cm. The resistance of the wire is

A
160 Ω

B
80 Ω

C
40 Ω

D
20 Ω

Solution
Question 3
4 / -1

In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is

A
2.2 k Ω

B
3.3 k Ω

C
5.6 k Ω

D
9.1 k Ω

Solution
Question 4
4 / -1

By increasing the temperature, the specific resistance of a conductor and a semiconductor

A
Increases for both

B
Decreases for both

C
Increases, decreases

D
Decreases, increases
Question 5
4 / -1

Which of the following is vector quantity?

A
Current density

B
Current

C
Wattless current

D
Power
Question 6
4 / -1

A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second [ e = 1.6 × 10^–19Coulomb] ?

A
6.25 × 10¹⁹

B
6.25 × 10¹⁵

C
6.25 × 10³¹

D
6.25 × 10⁸

Solution
Question 7
4 / -1

The drift velocity of free electrons in a conductor is ‘v’ when a current i is flowing in it. If both the radius and current are doubled, then drift velocity will be

A
v

B
v/2

C
v/4

D
v/8

Solution
Question 8
4 / -1

If σ₁, σ₂ and σ₃ are the conductance’s of three conductors, then their equivalent conductance, whenthey are joined in series, will be

A

B

C

D
None of these

Solution
Question 9
4 / -1

The resistance of a conductor increases with

A
Increase in length

B
Increase in temperature

C
Decrease in cross-sectional area

D
All of the above
Question 10
4 / -1

Two wires that are made up of two different materials whose specific resistance are in the ratio 2 : 3, length 3 : 4 and area 4 : 5. The ratio of their resistances is

A
6 : 5

B
6 : 8

C
5 : 8

D
1 : 2

Solution