# Current Electricity [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 77

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## Question number: 1

» Current Electricity » Potential Difference and EMF of Cell

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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 then the current would be

### Choices

Choice (4)Response

a.

Greater than 2I

b.

less than I

c.

Greater than I but less than 2I

d.

I

## Question number: 2

» Current Electricity » Resistances of Different Materials

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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: 8

b.

1: 1

c.

1: 2

d.

8: 1

## Question number: 3

» Current Electricity » Potentiometer

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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 of the emf of the two cells is

### Choices

Choice (4)Response

a.

3: 1

b.

4: 1

c.

2: 1

d.

1: 1

## Question number: 4

» Current Electricity » Series and Parallel Combinations of Resistors

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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.

1 and 2

b.

1,2 and 3

c.

2 and 4

d.

1 and 3

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