Current Electricity Test

Result

Current Electricity Test - 77

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Weekly Quiz Competition

Question 1
4 / -1

Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.0 mm. Conductor B is a hollow tube of outside diameter 2.0 mm and inside diameter 1.0 mm.The resistance ratio R_A/R_B will be

A
1

B
2

C
3

D
4

Solution
Question 2
4 / -1

A wire has resistance of 24 Ω is bent in the following shape. The effective resistance between A and B is

A
24 Ω

B
10 Ω

C

D
None of these

Solution
Question 3
4 / -1

In the circuit shown in figure, find the current through the branch BD

A
5 A

B
0 A

C
3 A

D
4 A

Solution
Question 4
4 / -1

Electric field (E) and current density (./) have relation

A
E ∝ J^–1

B
E ∝ J

C

D
Question 5
4 / -1

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

A
10¹⁰ m/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 atomic weight = 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 the cross-section of the wire in time from t = 0 to t = 2 sec. is

A
22 C

B
20 C

C
18 C

D
5 C

Solution
Question 8
4 / -1

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

A
10^–6Ω

B
2.5 × 10^–5Ω

C
10^–8Ω

D
5 × 10^–4Ω

Solution
Question 9
4 / -1

The resistivity of iron is 1 × 10^–7 ohm–m. The resistanceof 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
Question 10
4 / -1

The temperature coefficient of resistance for a wire is 0.00125/°C. At 300 K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is

A
1154 K

B
1100 K

C
1400 K

D
1127 K

Solution