Current Electricity-Resistances of Different Materials (NEET Physics): Questions 1 - 5 of 5

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Question number: 1

» 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: 2

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

The reading of voltmeter in the following circuit will be-

Circuit Diagram of 20Ω and 80Ω resistors, voltmeter and battery

Circuit Diagram of 20Ω and 80Ω Resistors, Voltmeter and Battery

Here in figure 20Ω and 80Ω resistors and battery connected in series. Voltmeter connected across the 80Ω resistors, internal resistance of voltmeter is also 80Ω.

Choices

Choice (4) Response

a.

0.80 volt

b.

2 volt

c.

1.60 volt

d.

1.33 volt

Question number: 3

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

A voltmeter can measure up to 25 volt and its resistance is 1000 Ω . The resistance required to add with voltmeter to measure up to 250 volt will be

Choices

Choice (4) Response

a.

900 Ω

b.

2500 Ω

c.

1000 Ω

d.

9000 Ω

Question number: 4

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

The shunt required for 10 % of main current to be sent through the moving coil galvanometer of resistance 99 Ω will be

Choices

Choice (4) Response

a.

90 Ω

b.

0.9 Ω

c.

9.9 Ω

d.

11 Ω

Question number: 5

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

A heater coil connected to a supply of a 220 F is dissipating some power P 1. The coil is cut into half and the two halves are connected in parallel. The heater now dissipates a power P 2. The ratio of power P 1: P 2 is

Choices

Choice (4) Response

a.

1: 4

b.

1: 2

c.

2: 1

d.

4: 1

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