Science : Ch 12 – Electricity

This test is designed based on NCERT Syllabus for Class 10 Topics : Electricity

Each time random 15 questions will be displaced
So retake the quiz till you have mastered all the questions

1 / 15

The values of mA and µA are:

10^-6 and 10^-9 A respectively

10^-3 and 10^-6 A respectively

10^-3 and 10^-9 A respectively

10^-6 and 10^-3 A respectively

2 / 15

Electrical resistivity of a given metallic wire depends upon:

Its length

Its thickness

Its shape

Nature of the material Explanation:

3 / 15

The resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamp, when not in use?

48 Ω

400 Ω

484 Ω

48.4 Ω

4 / 15

A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is:

2.5 A

5.0 A

7.5 A

10:00 AM

5 / 15

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly

10 to the power of 20

10 to the power of 16

10 to the power of 18

10 to the power of 23

6 / 15

A student drives out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is huge?

R1 = R2 = R3

R1 > R2 > R3

R3 > R2 > R1

R2 > R3 > R1

7 / 15

When electric current is passed, electrons move from:

High potential to low potential

Do not move

Out of the conductor

Low potential to high potential

8 / 15

Ohm’s law express that:

Resistance increases as current increases

Resistance decreases as current increases

Resistance increases as voltage increases

Current increases as voltage increases

9 / 15

The commercial unit of electric energy is

horse power

joule/hour

kilowatt hour

mega-watt hour

10 / 15

The formula which states the relation between potential diference, current and resistance

V = I R

I=VR

R=VI

all of these

11 / 15

The electrical resistance of a conductor having cross-sectional area 1 m² and length 1m

electrical inductivity

electrical resistivity

none

12 / 15

The ammeter is always connected in series because

to measure the current fowing through a circuit.

to measure the voltage fowing through a circuit.

to measure the potential difference fowing through a circuit.

to measure the resistance fowing through a circuit.

13 / 15

S.I unit of resistance

ohm

mho

ohm metre

none

14 / 15

At the time of short circuit, the electric current in the circuit

vary continuously

does not change

reduces substantially

increases heavily

15 / 15

The device used to measure the internal resistance of a cell, to compare the e.m.f. of two cells and potential diference across a resistor

Ammeter

voltmeter

galvanometer

potentiometer

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Science : Ch 12 – Electricity

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