Current Electricity (NEET Physics): Questions 1 - 4 of 75

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Question number: 1

» Current Electricity » Potential Difference and EMF of Cell

MCQ▾

Question

When a cell of emf E and internal resistance r, is connected to the ends of a resistance R, then current through resistance is I. If the same cell is connected to the ends of a resistance R2 then the current would be

Choices

Choice (4) Response
a.

less than I

b.

I

c.

Greater than I but less than 2I

d.

Greater than 2I

Question number: 2

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

Two wires of same material have length L and 2L and cross-sectional areas 4A and A respectively. The ratio of their specific resistance would be

Choices

Choice (4) Response
a.

1: 2

b.

1: 8

c.

1: 1

d.

8: 1

Question number: 3

» Current Electricity » Potentiometer

MCQ▾

Question

In a potentiometer experiment two cells of emf E1 and E 2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E 2 is reversed, then the balancing length becomes 29 cm.

The ratio E1E2 of the emf of the two cells is

Choices

Choice (4) Response
a.

4: 1

b.

1: 1

c.

2: 1

d.

3: 1

Question number: 4

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

An electric kettle has two heating coils. When one of the coils is switched on, the water begins to boil in 6 minutes. When the other is switched on, the boiling begins in 8 minutes. The time when the boiling begins if both coils are switched on simultaneously is (i) in series (ii) in parallel. (Specific heat of the water is 4.2 joules/gram 0 C)

Select the correct answers and mark it according to the following codes:

  1. 14 min in series
  2. 3.43 min in parallel
  3. 3.43 min in series
  4. 14 min in parallel

Choices

Choice (4) Response
a.

2 and 4

b.

1 and 3

c.

1, 2 and 3

d.

1 and 2

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