Important Questions (1 Mark): Electricity

# Important Questions (1 Mark): Electricity - Class 10

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## 25 Questions MCQ Test Science Class 10 - Important Questions (1 Mark): Electricity

Important Questions (1 Mark): Electricity for Class 10 2023 is part of Science Class 10 preparation. The Important Questions (1 Mark): Electricity questions and answers have been prepared according to the Class 10 exam syllabus.The Important Questions (1 Mark): Electricity MCQs are made for Class 10 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions (1 Mark): Electricity below.
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Important Questions (1 Mark): Electricity - Question 1

### Time rate of work done or electrical energy developed or consumed by a generator or appliance, is called electrical

Detailed Solution for Important Questions (1 Mark): Electricity - Question 1

Time rate of work done or electric energy develop or consumed by generator or appliance, is called electric power. We know, that the rate of work done per unit Time is known as power. So, here is some change ie., in terms of electricity Time rate of work done is known as electric power.

Important Questions (1 Mark): Electricity - Question 2

### The power of the battery in the resistor appears as

Detailed Solution for Important Questions (1 Mark): Electricity - Question 2

Firstly, you get shorter battery life simply because your average energy consumption is increased over the peak period.A battery generates power when it powers a light bulb. It dissipates power when it is being charged.

Important Questions (1 Mark): Electricity - Question 3

### In series combination of electrical appliances, total electrical power

Detailed Solution for Important Questions (1 Mark): Electricity - Question 3

Power is directly proportional to the potential difference and potential difference is directly proportional to the Current. In a series combination, Resistance is increased and thus the flow of current decreases Power is directly proportional to current therefore power decreases.

Important Questions (1 Mark): Electricity - Question 4

The rate of flow of an electric charge is known as :

Detailed Solution for Important Questions (1 Mark): Electricity - Question 4

As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit decreases and the total current of the circuit increases.Therefore the power decreases.

Important Questions (1 Mark): Electricity - Question 5

Power voltage rating of an electric bulb is 100 W 200 V. Current drawn by it will be

Detailed Solution for Important Questions (1 Mark): Electricity - Question 5

Power  =  voltage * current
Here, power = 100 W, voltage = 200 V
P  = V*I
Therefore, 100  = 200  * I
I   = 100/200 A
I   =  0.5 A

Important Questions (1 Mark): Electricity - Question 6

The total work done by an electrical appliance during its operation, is called electrical

Detailed Solution for Important Questions (1 Mark): Electricity - Question 6

Energy is the ability to do work, where work is done when a force moves an object. We need and we use energy every day, and energy is available in all different forms. Electrical energy is energy that is stored in charged particles within an electric field.

Important Questions (1 Mark): Electricity - Question 7

The unit of electrical energy is

Detailed Solution for Important Questions (1 Mark): Electricity - Question 7

Joule is the unit of work or energy; it is equal to the work done by a force of one newton acting through one meter. It was named in honor of the English physicist James Prescott Joule. It equals 107 ergs, or approximately 0.7377 foot-pounds. In electrical terms, the joule equals one watt-second—i.e., the energy released in one second by a current of one ampere through a resistance of one ohm.

Important Questions (1 Mark): Electricity - Question 8

Number of joules in 1 kWh is

Important Questions (1 Mark): Electricity - Question 9

When electric current flows through a conductor the conductor becomes

Important Questions (1 Mark): Electricity - Question 10

When electric current flows through a conductor

Important Questions (1 Mark): Electricity - Question 11

Heating of a current carrying conductor is due to

Detailed Solution for Important Questions (1 Mark): Electricity - Question 11

When electrons starts drifting into lower potential to higher potential then it get collision with their atoms. Due to which electron loses their kinetic energy and cause heat effect of current.

Important Questions (1 Mark): Electricity - Question 12

Out of the following which is an insulating material ?

Important Questions (1 Mark): Electricity - Question 13

Rate of energy transferred if a current of 0.5 A passes through a bulb connected across a battery of 6 V for 20 s is

Detailed Solution for Important Questions (1 Mark): Electricity - Question 13

Energy = v × i × t = 6 × 0.5 × 20 = 60J

Important Questions (1 Mark): Electricity - Question 14

In electric heating appliances the material of the heating element is

Important Questions (1 Mark): Electricity - Question 15

In domestic electric circuits, the cheapest appliance used is

Detailed Solution for Important Questions (1 Mark): Electricity - Question 15

In domestic electric circuits, the cheapest appliance used is fuse bulb .
An electric fuse is used as a safety device for the protection of electric circuits and appliances due to short - Circuiting or overloading of the electric circuits.

Important Questions (1 Mark): Electricity - Question 16

An ammeter has 20 divisions between mark 0 and mark 2 on its scale. The least count of the ammeter is

Detailed Solution for Important Questions (1 Mark): Electricity - Question 16

20 Divisions are equal to the 2A
1 division is equal to 2/20 = 0.1 A
therefore Least count of the Ammeter is 0.1 A.

Important Questions (1 Mark): Electricity - Question 17

In a voltmeter, there are 20 divisions between the 0 mark and 0.5 V mark. The least count of the voltmeter is

Detailed Solution for Important Questions (1 Mark): Electricity - Question 17

Least count L. C = 0.5 / No. of divisions
Least count of voltmeter L. C = 0.5/20
=> 0.025

Important Questions (1 Mark): Electricity - Question 18

Which two circuit components are connected in parallel in the following circuit diagram ? Detailed Solution for Important Questions (1 Mark): Electricity - Question 18

We know that the voltmeter is always connected in parallel across the resistance to measure voltage across the resistance. So, option ( b) is the correct answer.

Important Questions (1 Mark): Electricity - Question 19

Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

Detailed Solution for Important Questions (1 Mark): Electricity - Question 19

Resistance ‘R = 6ohm’ is related to length ‘L’, area of cross-section ‘A’ and resistivity ‘ρ’ as,

R = ρL/A

When L is doubled ,

As we know that the volume of the wire remains same.

old volume = new volume

AL = A'L' ....(i) ( as volume = area x length )

L' = 2L

So, from (i)

A' = A/2

So the new resistance is ,

R' = ρL'/A'

or

R' = ρ(2L)/(A/2) = 4 (ρL/A)

=> R' = 4R

thus, correct answer is option (b).

Important Questions (1 Mark): Electricity - Question 20

Electric pressure is also called

Detailed Solution for Important Questions (1 Mark): Electricity - Question 20

I = 180mA = 180 /1000 =b0.18A and the V = 1.8V.
So, R= V / I = 0.181.8 = 10 ohms.
Hence, the resistance in the circuit is 10 ohms.

Important Questions (1 Mark): Electricity - Question 21

Substances whose atoms have no free electrons, are called

Important Questions (1 Mark): Electricity - Question 22

Substances whose atoms have only few free electrons, are called

Important Questions (1 Mark): Electricity - Question 23

A neutral body has

Detailed Solution for Important Questions (1 Mark): Electricity - Question 23

Electrically neutral atoms simply possess the same number of electrons as protons. This gives the object a balance of both type of charge.

Important Questions (1 Mark): Electricity - Question 24

A body gets positively charged by losing

Important Questions (1 Mark): Electricity - Question 25

A body gets negatively charged by gaining

Detailed Solution for Important Questions (1 Mark): Electricity - Question 25

Electrons have negative energy. When the number of electrons and protons are equal the charge is neutral but if electron is added to it then the negative charge dominates which gives it negative charge.

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## Science Class 10

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