Electric Current and Its Effects (CBSE Class-7 Science): Questions 14 - 17 of 17

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Question number: 14

» Electric Current and Its Effects » Heating Effect of Electric Current » Miniature Circuit Breaker

MCQ▾

Question

MCB is better than fuse because:

Choices

Choice (4) Response

a.

It exceeds the specified maximum limit

b.

It automatically stops the current

c.

It does not have to be replaced

d.

All a. , b. and c. are correct

Question number: 15

» Electric Current and Its Effects » Heating Effect of Electric Current » Electric Iron and Heater

MCQ▾

Question

Heating devices contain wire in the form of a coil is called as:

Choices

Choice (4) Response

a.

Key

b.

Switch

c.

Element

d.

Ammeter

Question number: 16

» Electric Current and Its Effects » Symbols of Electric Components » Symbols for Some Electric Circuit Components

MCQ▾

Question

In the open circuit the flow of current is obstructed by:

Choices

Choice (4) Response

a.

Insulator

b.

Air & Insulator

c.

Air

d.

Conductor

Question number: 17

» Electric Current and Its Effects » Heating Effect of Electric Current » Electric Iron and Heater

MCQ▾

Question

Wattage is defined as:

Choices

Choice (4) Response

a.

Amount of current sufficient to run the appliance

b.

A coil of wire

c.

Unit of electricity

d.

Question does not provide sufficient data or is vague

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