CBSE Class X – Science Physics Exam (Full Syllabus)

This test is designed based on NCERT Syllabus for Class 10 Topics of Science – Physics

Each time random 25 questions will be displaced from the question bank of 500 + Questions
So we recommend you to retake the quiz till you have mastered all the questions

1 / 25

Magnetic effect of current was identified by:

Oersted

Faraday

Bohr

Ampere

2 / 25

A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid:

will decrease

will remains same

will increase

will become zero

3 / 25

A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference:

more in (ii) than in (i) case

same in both

can’t say

4 / 25

The commercial motors use a soft iron core on which the coil is wound because

to increase the power of the electric motor

to decrease the power of the electric motor

to reduce the power of the electric motor.

none

5 / 25

An electron moves with a speed v along positive direction of the x-axis. If a magnetic feld B acts along the positive y-direction, then the force on the electron will act along

x axis

y axis

–ve z-direction

+ve z-direction

6 / 25

The deflection of the galvanometer becomes zero the moment the motion of

magnet stops.

magnet starts

magnet remains constant

none of these

7 / 25

A device that can convert electrical energy into mechanical energy is

Galvanamoter

electric motor

ammeter

voltmeter

8 / 25

When a strong bar magnet is pushed into a coil of insulated copper wire connected to a galvanometer, we will observe a deflection in the galvanometer in

unidirection

bidirection

multidirection

none

9 / 25

A cell, a resistor, a key, and an ammeter are arranged as shown in the circuit diagrams. The current recorded in the ammeter will be:

maximum in (i)

maximum in (ii)

maximum in (iii)

same in all the cases

10 / 25

True test of charge is

Attraction only

Repulsion only

Both attraction and repulsion

None of the above

11 / 25

The condition for the credibility of Ohm’s law is that the

Temperature should remain constant

Current should be proportional to voltage

Resistance must be wire wound type

All of the above

12 / 25

Copper is not approved to make fuse wire because it:

is a good conductor of electricity

has a low melting point

has a high melting point

is not easily available

13 / 25

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

electrical inductivity

electrical resistivity

none

14 / 25

S.I unit of resistance

ohm

mho

ohm metre

none

15 / 25

The equivalent resistance of a series combination of two resistances is X Ohm. If the resistance are of 10 Ohm and 40 Ohm respectively, the value of X will be:

50 ohm

20 ohm

10 ohm

40 ohm

16 / 25

An ideal ammeter is one which has

infinite resistance

zero resistance

finite resistance

no resistance

17 / 25

The instrument used for measuring electric current is

Ammeter

voltmeter

galvanometer

potentiometer

18 / 25

At noon, the Sun looks white as:

light is least scattered

all the colours of the white light are scattered away

blue colour is scattered the most

red colour is scattered the most

19 / 25

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

is scattered the most by smoke or fog

is scattered the least by smoke or fog

is absorbed the most by smoke or fog

moves the fastest in air

20 / 25

The sun appears red at sunset or sunrise. Choose the incorrect statement from the following

Light from the sun near the horizon passes through the layers of air.

Light from the sun near the horizon travels larger distance in the earth’s atmosphere before reaching our eyes. (c)

Most of the blue light and longer wavelengths are scattered away by the particles.

Most of the blue light and shorter wavelengths are scattered away by the

21 / 25

Milk is a colloid that contains globules of fat and protein. When a beam of light is directed at a glass of milk the light is scattered. That is a great example

Tyndall effect

Dispersion of light

Scattering of light

Reflection of light

22 / 25

When a fine beam of sunlight enters a smoke filled room, smoke particles become visible due to scattering of light by these particles

Tyndall effect

Dispersion of light

Scattering of light

Reflection of light

23 / 25

Power of a lens is

1/f

1/T

1/fT

none

24 / 25

Effect produced by scattering of light by the atmosphere.

Refraction effect

Tyndal effect

Dispersion

all of these

25 / 25

The splitting of light into its component colours is called

Dispersion of light

Scattering of light

Refraction of light

Reflection of light

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CBSE Class X – Science Physics Exam (Full Syllabus)

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