Current Electricity (AIIMS Physics): Questions 6 - 10 of 11

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Question number: 6

» Current Electricity » Electric Cell and Its Internal Resistance

Appeared in Year: 2004

Assertion-Reason▾

Assertion (Ꭺ)

A larger dry cell has higher emf.

Reason (Ꭱ)

The emf of a dry cell is proportional to its size.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

Question number: 7

» Current Electricity » Electric Current

MCQ▾

Question

A current of 1.34A exists in a copper wire of cross - section 1.0mm2 . Assuming each copper atom contributes one free electron. Calculate the drift speed of the free electrons in the wire. The density of copper is 8990kgm3 and atomic mass =63.50 .

Choices

Choice (4) Response

a.

2×104ms

b.

104ms

c.

105ms

d.

2×105ms

Question number: 8

» Current Electricity » Electric Current

MCQ▾

Question

The current through a wire depends on time as I=(5+8t+3t2)A . Calculate the charge crossed through a cross section of the wire in 4s .

Choices

Choice (4) Response

a.

112C

b.

148C

c.

73C

d.

176C

Question number: 9

» Current Electricity » Electric Current

MCQ▾

Question

The number of electron passing through a heater wire in 30 seconds, if it carries a current of 10 A is approximately –

Choices

Choice (4) Response

a.

1×1022

b.

1×1021

c.

2×1021

d.

2×1022

Question number: 10

» Current Electricity » Electric Cell and Its Internal Resistance

MCQ▾

Question

A cell of emf E is first connected to 10Ω and then connected to resistance 40Ω . If heat produced in both cases is same then, what is internal resistance of cell?

Choices

Choice (4) Response

a.

30Ω

b.

40Ω

c.

5Ω

d.

20Ω

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