# Physics-Magnetism & Electricity at Work (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 5 - 8 of 10

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## Question number: 5

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

In an experiment, it was observed that when the length of a wire in an electrical circuit is doubled, everything else remaining same, the current becomes half. On the other hand, if the thickness (diameter) of the wire is doubled, the current becomes 4 times. Two wires W1 and W2 of the same metal have the same current passing through them. The thickness of wire W2 is twice that of W1, then the length of the wire W2 is

### Choices

Choice (4) Response

a.

two times that of wire W1

b.

four times that of wire W1

c.

sixteen times that of wire W1

d.

same as that of wire W1

## Question number: 6

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

Which one of the following statements is wrong?

### Choices

Choice (4) Response

a.

Ammeter is placed in parallel

b.

Voltmeter should have high resistance

c.

Ammeter should have low resistance

d.

Voltmeter is placed in parallel across the conductor in a circuit

## Question number: 7

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 Ω, the electrical resistivity of the material is

### Choices

Choice (4) Response

a.

b.

0.22×10 - 6Ω. m

c.

d.

## Question number: 8

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combination would be

### Choices

Choice (4) Response

a.

1: 4

b.

1: 2

c.

4: 2

d.

2: 2

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