Current Electricity Test

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Current Electricity Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Therefore, the red colour will emerge first after travelling through the slab.

A
0.75 V

B
1.25 V

C
2.0 V

D
0.50 V

Solution

The cells support each other. E_eq = E₁ + E₂ = 1.25 + 0.75 = 2.0V
Question 2
1 / -0

Potentiometer measures the potential difference more accurately than a voltmeter, because

A
it has a wire of low resistance.

B
it has a wire of high resistance

C
it has a wire of high resistance

D
It does not draw current from external circuit.

Solution

Potentiometer measures the potential difference using null deflection method, where no current is drawn from the cell; whereas voltmeter needs a small current to show deflection. So, accurate measurement of p.d is done using a potentiometer.
Question 3
1 / -0

Kirchhoff’s second law is a consequence of

A
Law of conservation of charge

B
Law of conservation of angular momentum

C
Law of conservation of energy

D
Law of conservation of momentum

Solution

Work done in moving a charge in a closed circuit is zero, therefore the algebraic sum of potential differences in a closed circuit is zero.
Question 4
1 / -0

Fuse wire is an alloy of

A
aluminium and tin

B
tin and lead

C
gold and silver

D
None of these
Question 5
1 / -0

A parallel combination of two resistors, of 1 ohm each, is connected in series with a 1.5 ohm resistor. The total combination is connected across a 10 V battery. The current flowing in the circuit is

A
5 A

B
20 A

C
0.2 A

D
0.4 A
Question 6
1 / -0

The sensitivity of the potentiometer can be increased by:

A
increasing the e.m.f. of primary cell.

B
decreasing the length of potentiometer wire.

C
increasing the potential gradient.

D
increasing the length of potentiometer wire.

Solution

A potentiometer is considered to be sensitive if the potential gradient (dV/dl) is low. Such a potentiometer can measure very small changes in potential difference. Increasing the length of the potentiometer wire decreases the potential gradient. Its sensitivity increases. Increasing potential gradient decreases the sensitivity. increasing the emf of the primary cell and by decreasing the length, potential gradient increases.
Question 7
1 / -0

The following question has four choices out of which ONLY ONE is correct.

Melting point of fuse wire should be

A
high

B
low

C
very high

D
none of these
Question 8
1 / -0

Two wires with the same dimensions and resistivities ρ₁ and ρ₂ are connected in series. The equivalent resistivity of the combination is

A
ρ₁₊ρ₂/ 2

B
ρ₁₊ρ₂

C
2(ρ₁₊ρ₂)

D
√ρ₁ρ₂

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Current Electricity Test - 3

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Current Electricity Test - 3

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Question 1

0.75 V

1.25 V

2.0 V

0.50 V

Solution

Question 2

it has a wire of low resistance.

it has a wire of high resistance

it has a wire of high resistance

It does not draw current from external circuit.

Solution

Question 3

Law of conservation of charge

Law of conservation of angular momentum

Law of conservation of energy

Law of conservation of momentum

Solution

Question 4

aluminium and tin

tin and lead

gold and silver

None of these

Question 5

5 A

20 A

0.2 A

0.4 A

Question 6

increasing the e.m.f. of primary cell.

decreasing the length of potentiometer wire.

increasing the potential gradient.

increasing the length of potentiometer wire.

Solution

Question 7

high

low

very high

none of these

Question 8

ρ1+ρ2 / 2

ρ1+ρ2

2(ρ1+ρ2)

√ρ1ρ2

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ρ₁₊ρ₂/ 2

ρ₁₊ρ₂

2(ρ₁₊ρ₂)

√ρ₁ρ₂