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

Series circuit with two resister and two batteries

Series Circuit With Two Resister and Two Batteries

Find the current flowing in the circuit

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

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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