Physics-Magnetism & Electricity at Work (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 38 - 41 of 46

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Question number: 38

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

The masses of the three wires of copper are in the ratio 5:3:1 and their lengths are in the ratio 1: 3: 5. The ratio of their electrical resistance is

Choices

Choice (4) Response

a.

5:3:1

b.

1:3:5

c.

125:15:1

d.

1:15:125

Question number: 39

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Three equal resistors each equal to “r” are connected as shown in figure. The equivalent resistance between points A and B is

Three resisters connection

Three Resisters Connection

Find equivalent resistance between two points

Choices

Choice (4) Response

a.

r3

b.

r

c.

3r

d.

23 r

Question number: 40

» Physics » Magnetism & Electricity at Work

Assertion-Reason▾

Assertion (Ꭺ)

Net torque in the current carrying loop placed in a uniform magnetic field (pointing inwards) is zero.

A uniform magnetic field

A Uniform Magnetic Field

The current carrying loop placed in a uniform magnetic field.

Reason (Ꭱ)

Magnetic moment (m) is inwards.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

Question number: 41

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

The freezer in a refrigerator is located at the top section so that

Choices

Choice (4) Response

a.

The heat gained from the environment is high

b.

The motor is not heated

c.

The entire chamber of the refrigerator is cooled quickly due to convection

d.

The heat gained from the environment is low

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