Physics-Magnetism & Electricity at Work (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 7 - 12 of 46

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Question number: 7

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Consider the following facts regarding electrons and identify the incorrect statements.

Choices

Choice (4) Response
a.

Relative charge of an electron is -1

b.

Electron was named by stoney

c.

Mass of an electron is 9.11 x 10- 27 g

d.

Charge of an electron is -1.6 × 10 -19 C

Question number: 8

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

A permanent magnet

Choices

Choice (4) Response
a.

attracts magnetic substances and repels all non-magnetic substances

b.

attracts all substances

c.

attracts only magnetic substances

d.

attracts non-magnetic substances and repels magnetic substances

Question number: 9

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

If in the circuit, power dissipation is 150 W, then R is

The image display is power circut.

The Image Display Is Power Circut.

Find the value of one resistance in a Parallel circuit

Choices

Choice (4) Response
a.

4 Ω

b.

6 Ω

c.

5 Ω

d. None of the above

Question number: 10

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

On applying an external magnetic field to a ferromagnetic substance domains

Choices

Choice (4) Response
a.

align in the direction opposite to magnetic field

b.

remains unaffected

c.

align in the direction of magnetic field

d. All of the above

Question number: 11

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

A current of 0.5 A is drawn by a filament of an electric bulb for half an hour. What is the amount of electric charge that flows through the circuit?

Choices

Choice (4) Response
a.

900°C

b.

9°C

c.

5°C

d.

600°C

Question number: 12

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

A water heater marked 2 kW, 220 V is connected to a 220 V supply. How long will it take to heat 20 kg of water from 10°C to 30°C? Assume that all the heat is taken up by the water, (specific heat of water = 4200 J kg- 2 C- 2)

Choices

Choice (4) Response
a.

14min

b.

28 min

c.

41 min

d.

20min

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