# Physics-Magnetism & Electricity at Work (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 20 - 24 of 47

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## Question number: 20

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

Magnetic lines of force due to a bar magnet do not intersect because

### Choices

Choice (4) Response

a.

the lines have similar charges and so repel each other

b.

a point always has a single net magnetic field

c.

the lines always diverge from a single point

d.

All of the above

## Question number: 21

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

Find the current in the given circuit

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

## Question number: 22

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

When the magnet is brought near the iron needle, it act as

### Choices

Choice (4) Response

a.

non-magnetic material

b.

bar-magnetic

c.

temporary magnet

d.

All of the above

## Question number: 23

» Physics » Magnetism & Electricity at Work

Appeared in Year: 2013

MCQ▾

### Question

Three equal resistors connected in series across a source of emf dissipate 10 watts of power. What will be the power dissipated is watts if the same resistors are connected in parallel across the same source of emf?

### Choices

Choice (4) Response

a.

12 W

b.

30W

c.

10W

d.

90W

## Question number: 24

» Physics » Magnetism & Electricity at Work

Appeared in Year: 2013

MCQ▾

### Question

An electric iron draws a current of 15 A from 220V supply. What is the cost of using iron for 30 min every day for 15 days if the cost of unit (1 unit = 1 KW/hr) is 2 rupees?

### Choices

Choice (4) Response

a.

Rs. 60

b.

Rs. 40

c.

Rs. 10

d.

Rs49.5

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