Current Electricity Test

Result

Current Electricity Test - 31

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Weekly Quiz Competition

Question 1
4 / -1

The wire used in the arrangement shown in fig. has a resistance r ohm per metre. The equivalent resistance between points A and B if radius of circle is 1 m is

A

B

C

D

Solution
Question 2
4 / -1

In the circuit shown Fig. potential difference between X and Y will be

A
zero

B
20 V

C
60 V

D
120 V

Solution
Question 3
4 / -1

A beam of electrons emitted from the electron gun G is accelerated by an electric field E. The area of cross- section of the beam remains constant. As the beam moves away from G

A
the speed of the electrons increases

B
the current constituted by beam increases

C
the number of electrons per unit volume in the beam decreases

D
the number of electrons per unit volume in the beam increases.
Question 4
4 / -1

When the current i is flowing through a conductor, the drift velocity is v. If 2i current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be

A
v/4

B
v/2

C
v

D
4v

Solution
Question 5
4 / -1

When current flows through a conductor, then the order of drift velocity of electrons will be

A
10¹⁰ cm/sec

B
10^–2 cm/sec

C
10⁴ cm/sec

D
10^–1 cm/sec

Solution
Question 6
4 / -1

Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (Density of copper = 9 × 10³ kg m^–3 and atomicweight = 63)

A
0.3 mm/sec

B
0.1 mm/sec

C
0.2 mm/sec

D
0.2 cm/sec

Solution
Question 7
4 / -1

The current flowing through a wire depends on time as I = 3t² + 2t + 5. The charge flowing through thecross-section of the wire in time from t = 0 to t = 2 secis

A
22 C

B
20 C

C
18 C

D
5 C

Solution
Question 8
4 / -1

Resistance of wire at 20°C is 20 Ω and at 500°C is 60 Ω. At what temperature its resistance is 25 Ω?

A
160° C

B
250° C

C
100° C

D
80° C

Solution
Question 9
4 / -1

The specific resistance of manganin is 50 × 10^–8ohm × m. The resistance of a cube of length 50 cm will be

A
10^–6 ohm

B
2.5 × 10^–5 ohm

C
10^–8Ω

D
5 ×10^–4 ohm

Solution
Question 10
4 / -1

The resistivity of iron is 1 × 10^–7 ohm-m. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm-m will be

A
1 × 10^–7

B
2 × 10^–7

C
4 × 10^–7

D
8 × 10^–7