Physics-Magnetism & Electricity at Work (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 13 - 19 of 46

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Question number: 13

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Above the Curie temperature, the susceptibility of a ferromagnetic substance varies

Choices

Choice (4) Response

a.

directly as the absolute temperature

b.

inversely as the square of absolute temperature

c.

inversely as the absolute temperature

d.

directly as the square of absolute temperature

Question number: 14

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

A current flows in a conductor from East to West. The direction of the magnetic field at a point above the conductor is

Choices

Choice (4) Response

a.

towards South

b.

towards North

c.

towards East

d.

towards West

Question number: 15

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

In a transformer, number of turns in the primary are 140 and that in secondary are 280. If current in primary is 4 A, then current in secondary is

Choices

Choice (4) Response

a.

4A

b.

10A

c.

2A

d.

6A

Question number: 16

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Which of the following is the most suitable material for making permanent magnet?

Choices

Choice (4) Response

a.

Steel

b.

Soft iron

c.

Copper

d.

Nickel

Question number: 17

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Given three equal resistors, how many different combinations of all three resistors can be made?

Choices

Choice (4) Response

a.

Six

b.

Three

c.

Four

d.

Five

Question number: 18

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Hysteresis loss for steel is……that for iron.

Choices

Choice (4) Response

a.

greater than

b.

equal to

c.

less than

d.

None of the above

Question number: 19

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

A plane mirror reflects a pencil of light to form a real image. Then, the pencil of light incident on the mirror is

Choices

Choice (4) Response

a.

convergent

b.

divergent

c.

parallel

d.

Question does not provide sufficient data or is vague

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