Current Electricity Test

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Current Electricity Test - 87

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Weekly Quiz Competition

Question 1
4 / -1

What is the resistance of a carbon resistance which has bands of colours brown, black and brown?

A
100 Ω

B
1000 Ω

C
10 Ω

D
1 Ω

Solution
Question 2
4 / -1

The lead wires should have

A
Larger diameter and low resistance

B
Smaller diameter and high resistance

C
Smaller diameter and low resistance

D
Larger diameter and high resistance
Question 3
4 / -1

The alloys constantan and manganin are used to make standard resistance because they have

A
Low resistivity

B
High resistivity

C
Low temperature coefficient of resistance

D
Both (b) and (c)
Question 4
4 / -1

When a potential difference is applied across the ends of a linear metallic conductor

A
The free electrons are accelerated continuously from the lower potential end to the higher potential end of the conductor

B
The free electrons are accelerated continuously from the higher potential end to the lower potential end of the conductor

C
The free electrons acquire a constant drift velocity from the lower potential end to the higher potential end of the conductor

D
The free electrons are set in motion from their position of rest
Question 5
4 / -1

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then

A
The resistance will be doubled and the specific resistance will be halved

B
The resistance will be halved and the specific resistance will remain unchanged

C
The resistance will be halved and the specific resistance will be doubled

D
The resistance and the specific resistance, will both remain unchanged

Solution
Question 6
4 / -1

A wire of diameter 0.02 metre contains 10²⁸ free electrons per cubic metre. For an electrical current of 100 A, the drift velocity of the free electrons in the wire is nearly

A
1 × 10^–19 m/s

B
5 × 10^–10 m/s

C
2 × 10^–4 m/s

D
8 × 10³ m/s

Solution
Question 7
4 / -1

The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance?

A
Length = 50 cm, diameter = 0.5 mm

B
Length = 100 cm, diameter = 1 mm

C
Length = 200 cm, diameter = 2 mm

D
Length = 300 cm, diameter = 3 mm

Solution
Question 8
4 / -1

The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is

A
21 × 10³ ± 10%

B
23 × 10¹ ± 10%

C
21 × 10³ ± 5%

D
12 × 10³ ± 5%

Solution
Question 9
4 / -1

A colour coded carbon resistor has the colours orange, blue, green and silver. Its resistance value and tolerancepercentage respectively are

A
36 × 10⁵Ω and 10%

B
36 × 10⁴Ω and 5%

C
63 × 10⁵Ω and 10%

D
36 × 10⁶Ω and 5%

Solution
Question 10
4 / -1

The tolerance level of a resistor with the colour code red, blue, orange, gold is

A
± 5%

B
± 10%

C
± 20%

D
± 40%

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Re-Attempt Weekly Quiz Competition

Current Electricity Test - 87

Result

Current Electricity Test - 87

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SHARING IS CARING

Question 1

100 Ω

1000 Ω

10 Ω

1 Ω

Solution

Question 2

Larger diameter and low resistance

Smaller diameter and high resistance

Smaller diameter and low resistance

Larger diameter and high resistance

Question 3

Low resistivity

High resistivity

Low temperature coefficient of resistance

Both (b) and (c)

Question 4

The free electrons are accelerated continuously from the lower potential end to the higher potential end of the conductor

The free electrons are accelerated continuously from the higher potential end to the lower potential end of the conductor

The free electrons acquire a constant drift velocity from the lower potential end to the higher potential end of the conductor

The free electrons are set in motion from their position of rest

Question 5

The resistance will be doubled and the specific resistance will be halved

The resistance will be halved and the specific resistance will remain unchanged

The resistance will be halved and the specific resistance will be doubled

The resistance and the specific resistance, will both remain unchanged

Solution

Question 6

1 × 10–19 m/s

5 × 10–10 m/s

2 × 10–4 m/s

8 × 103 m/s

Solution

Question 7

Length = 50 cm, diameter = 0.5 mm

Length = 100 cm, diameter = 1 mm

Length = 200 cm, diameter = 2 mm

Length = 300 cm, diameter = 3 mm

Solution

Question 8

21 × 103 ± 10%

23 × 101 ± 10%

21 × 103 ± 5%

12 × 103 ± 5%

Solution

Question 9

36 × 105Ω and 10%

36 × 104Ω and 5%

63 × 105Ω and 10%

36 × 106Ω and 5%

Solution

Question 10

± 5%

± 10%

± 20%

± 40%

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1 × 10^–19 m/s

5 × 10^–10 m/s

2 × 10^–4 m/s

8 × 10³ m/s

21 × 10³ ± 10%

23 × 10¹ ± 10%

21 × 10³ ± 5%

12 × 10³ ± 5%

36 × 10⁵Ω and 10%

36 × 10⁴Ω and 5%

63 × 10⁵Ω and 10%

36 × 10⁶Ω and 5%