🎯 Knowledge Check

Physics — Electricity

50 Questions Class 10 MCQs
1
The SI unit of electric current is:
2
The rate of flow of electric charge is called:
3
Potential difference between two points is:
4
Ohm’s law is represented by:
5
The SI unit of resistance is:
6
Which device measures electric current?
7
A voltmeter is connected in:
8
The commercial unit of electrical energy is:
9
Resistivity depends on:
10
The filament of an electric bulb is made of:
11
The heating effect of current is governed by:
12
Which connection ensures equal voltage across components?
13
When length of a wire is doubled, resistance becomes:
14
Resistance decreases when:
15
A fuse wire is made of:
16
Power consumed by a device is:
17
In parallel circuits, total resistance is:
18
Unit of charge is:
19
Electric current in metals is due to movement of:
20
The device used to vary current in a circuit is:
21
The relation between energy and power is:
22
If current is doubled, heat produced becomes:
23
Pure water is:
24
The resistance of a conductor depends on:
25
Which is a good conductor?
26
Drift velocity refers to:
27
EMF of a cell refers to:
28
Household mains supply in India is:
29
Frequency of AC supply in India is:
30
A short circuit occurs when:
31
Overloading occurs when:
32
Which quantity is scalar?
33
If V = 10 V and R = 5 O, current is:
34
Heat generated in a resistor depends on:
35
Resistivity decreases for:
36
A high resistance wire is:
37
Fuse protects appliances from:
38
A series circuit has:
39
A parallel circuit has:
40
Power rating on devices indicates:
41
SI unit of power is:
42
The formula for electrical energy is:
43
Which of the following decreases resistance?
44
A device that opens or closes a circuit is:
45
Electric power can also be written as:
46
A material with extremely low resistivity is:
47
Which circuit is used in homes?
48
Joule’s law states heat depends on:
49
A device that prevents electric shock is:
50
A household meter measures:
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Frequently Asked Questions

Electricity is the flow of electric charge (usually electrons) through a conductor due to a potential difference.

Electric current is the rate of flow of charge through a conductor.

Ampere (A).

A current of 1 A flows when 1 coulomb of charge passes through a conductor in 1 second.

\(( I = \frac{Q}{t} \) where \(I\) = current, \(Q\) = charge, \(t\) = time.

It is the work done to move a unit charge between two points in an electric circuit.

Volt (V).

\( V = \frac{W}{Q} \)

A device used to measure potential difference in a circuit.

Always in parallel with the component.

A device used to measure current in a circuit.

Always in series with the component.

Resistance is the opposition offered by a conductor to the flow of electric current.

Ohm (O).

At constant temperature, the current through a conductor is directly proportional to the potential difference across it: ( V \propto I ).

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