CBSE 12 Physics Question Paper-2020 Set-1 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Physics Question Paper-2020 Set-1
CBSE 12 Physics Question Paper-2020 Set-1

CBSE 12 Physics Question Paper-2020 Set-1

This mock test includes actual CBSE Class 12 Physics board exam questions from the year 2020 set-1, helping students understand exam trends and practice real paper format

2025-08-07
Pavan Pavan
CBSE Class 12 Physics 2020 Grade 12

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

Photons of energies 1 eV and 2 eV are successively incident on a metallic surface of work function 0.5 eV. The ratio of kinetic energy of most energetic photoelectrons in the two cases will be

A
1 : 2
B
1 : 1
C
1 : 3
D
1 : 4

Which of the following statements is not correct according to Rutherford model?

A
Most of the space inside an atom is empty.
B
The electrons revolve around the nucleus under the influence of coulomb force acting on them.
C
Most part of the mass of the atom and its positive charge are concentrated at its centre.
D
The stability of atom was established by the model.

The resolving power of a telescope can be increased by increasing

A
wavelength of light.
B
diameter of objective.
C
length of the tube.
D
focal length of eyepiece.

The magnetic dipole moment of a current carrying coil does not depend upon

A
number of turns of the coil.
B
cross-sectional area of the coil.
C
current flowing in the coil.
D
material of the turns of the coil.

A biconvex lens of glass having refractive index 1.47 is immersed in a liquid. It becomes invisible and behaves as a plane glass plate. The refractive index of the liquid is

A
1.47
B
1.62
C
1.33
D
1.51

For a glass prism, the angle of minimum deviation will be smallest for the light of

A
red colour.
B
blue colour.
C
yellow colour.
D
green colour.

The magnetic dipole moment of a current carrying coil does not depend upon

A
number of turns of the coil.
B
cross-sectional area of the coil.
C
current flowing in the coil.
D
material of the turns of the coil.

The ratio of power dissipated in two resistors R1 and R2 of 4Ξ© and 6Ξ© connected in parallel across a battery is

A
4 : 9
B
3 : 2
C
9 : 4
D
2 : 3

If the net electric flux through a closed surface is zero, then we can infer

A
no net charge is enclosed by the surface.
B
uniform electric field exists within the surface.
C
electric potential varies from point to point inside the surface.
D
charge is present inside the surface.

Which of the following statements is not correct according to Rutherford model?

A
Most of the space inside an atom is empty.
B
The electrons revolve around the nucleus under the influence of coulomb force acting on them.
C
Most part of the mass of the atom and its positive charge are concentrated at its centre.
D
The stability of atom was established by the model.

A point charge is situated at an axial point of a small electric dipole at a large distance from it. The charge experiences a force F. If the distance of the charge is doubled, the force acting on the charge will become

A
2F
B
F/2
C
F/4
D
F/8

In an experiment, two resistors R1 and R2 have resistances of 4Ξ© and 6Ξ© respectively. The ratio of power dissipated in them is

A
4 : 9
B
3 : 2
C
9 : 4
D
2 : 3

The angle of minimum deviation for a glass prism will be smallest for which color?

A
Red
B
Blue
C
Yellow
D
Green

The magnetic dipole moment of a current carrying coil depends on

A
Number of turns of the coil
B
Cross-sectional area of the coil
C
Current flowing in the coil
D
Material of the turns of the coil

Two resistors R1 and R2 of resistances 4Ξ© and 6Ξ© respectively are connected in parallel. The ratio of power dissipated in R1 to R2 is

A
4 : 9
B
3 : 2
C
9 : 4
D
2 : 3

The net electric flux through a closed surface is zero. This implies

A
No net charge is enclosed by the surface.
B
Uniform electric field exists within the surface.
C
Electric potential varies from point to point inside the surface.
D
Charge is present inside the surface.

The refractive index of a liquid in which a biconvex lens of refractive index 1.47 becomes invisible and behaves as a plane glass plate is

A
1.47
B
1.62
C
1.33
D
1.51

For a glass prism, the angle of minimum deviation is smallest for which color of light?

A
Red
B
Blue
C
Yellow
D
Green

Which of the following statements is correct according to Rutherford's model?

A
Most of the space inside an atom is empty.
B
The electrons revolve around the nucleus under the influence of Coulomb force.
C
Most of the mass of the atom and its positive charge are concentrated at its centre.
D
The stability of the atom was established by the model.

In an experiment, photons of energies 1 eV and 2 eV are incident on a metallic surface with a work function of 0.5 eV. What is the ratio of kinetic energy of most energetic photoelectrons in both cases?

A
1 : 2
B
1 : 1
C
1 : 3
D
1 : 4

Which of the following properties is not correct for a biconvex lens of glass refractive index 1.47?

A
It behaves as a plane glass plate when immersed in a liquid with the same refractive index.
B
It becomes invisible when immersed in a liquid.
C
Its focal length is affected by the refractive index of the surrounding medium.
D
It behaves as a normal lens in air.

The force on a point charge placed at a distance from an electric dipole will decrease when

A
The distance between the charge and the dipole is increased.
B
The charge is placed closer to the dipole.
C
The dipole moment increases.
D
The magnitude of the charge increases.

For a current-carrying coil, the magnetic dipole moment depends on

A
Number of turns of the coil.
B
Cross-sectional area of the coil.
C
Current flowing in the coil.
D
All of the above.

The angle of minimum deviation for a prism depends on the refractive index of the material. The smallest deviation occurs for

A
Red light.
B
Blue light.
C
Green light.
D
Yellow light.

The resistance of a wire increases with temperature due to

A
Decreased electron density.
B
Increased electron density.
C
Decreased relaxation time.
D
Increased mean free path.

The ratio of power dissipated in two resistors connected in parallel is proportional to

A
The square of the resistance.
B
The resistance.
C
The square of the current.
D
The voltage.

A point charge experiences a force due to a dipole. If the distance is doubled, the force will

A
Decrease by a factor of 4.
B
Increase by a factor of 2.
C
Increase by a factor of 4.
D
Remain the same.

The electric field inside a conductor in electrostatic equilibrium is

A
Zero.
B
Non-zero.
C
Constant.
D
Varying.

The force experienced by a charge in an electric field depends on

A
The magnitude of the charge.
B
The electric field strength.
C
The distance from the charge.
D
All of the above.

The potential energy of an electric dipole in a uniform electric field is

A
Zero when aligned.
B
Maximum when aligned.
C
Zero when perpendicular.
D
Maximum when perpendicular.