HBSE Class 12 Physics MCQ Important Question Answer 2025

Class 12 Physics Important Question Answer solution with pdf. Here We Provides Class 1 to 12 all Subjects NCERT Solution with Notes, Question Answer, CBSE and HBSE Important Questions, MCQ and old Question Papers for Students.

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HBSE ( Haryana Board ) Solution of Class 12 Physics important MCQ Question And Answer solution for 2025 exams.

HBSE Class 12 Physics Important MCQ Question Answer 2025

HBSE Class 12 Physics Chapter 1 Electric Charges and Fields MCQ Important Questions 2024-25

1. SI unit of electric charge is :
(A) Ampere
(B) Coulomb
(C) Volt
(D) None

Ans – (B) Coulomb

2. SI unit of k (proportionality constant in coulomb’s law) is :
(A) N¹C^-2m²
(B) N¹C²m^-2
(C) N¹C²m^-2
(D) N^–¹C^-2m²

Ans – (A) N¹C^-2m²

3. Nature of electric force between two protons is :
(A) Attractive
(B) Neutral
(C) Repulsive
(D) None of the above

Ans – (C) Repulsive

4. SI unit of ε₀ (permittivity of free space) is :
(A) C^-2N¹m^-2
(B) C²N^-1m^-2
(C) N¹C²m^-2
(D) N^-1C²m²

Ans – (B) C²N^-1m^-2

5. Two charges +1μc and + 8μc are situated at a distance in air. The ratio of forces acting on them is : Most Important
(A) 1:8
(B) 8:1
(C) 1:1
(D) 1:16

Ans – (C) 1:1

6. When the distance between two charged particles is made one- fourth, the force between them becomes :
(A) one-fourth
(B) one-third
(C) half
(D) sixteen times.

Ans – (D) sixteen times.

7. When the distance between two charged particles is made one- third, the force between them becomes :
(A) one-third
(B) half
(C) one-fourth
(D) nine times

Ans -(D) nine times

8. When the distance between two charged particles is halved, the force between them becomes :
(A) one-fourth
(B) half
(C) double
(D) four times

Ans – (C) double

9. Ratio of magnitudes of electric force in air and water between an electron and proton is:
(A) K (dielectric constant )
(B) $\displaystyle \frac{1}{K}$
(C) 1
(D) 0

Ans -(C) 1

HBSE Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance MCQ Important Questions 2024-25

1. How much current is flowing through a 3 kΩ resistor when a potential difference of 6V is applied across its ends?
(A) 2 μA
(B) 2 mA
(C) 2 A
(D) 6 A

Ans -(B) 2 mA

2. The electric potential energy of a system of two positive point charges of 1 μc each placed in air 1 metre a part is:
(A) 1 Joule
(B) 1 electron-volt
(C) 9 x 10^-3 Joule
(D) Zero

Ans – (D) Zero

3. Three capacitors of equal capacity C are joined first in parallel and then in series. The ratio of equivalent capacities in both the cases will be:
(A) 9:1
(B) 6:1
(C) 3: 1
(D) 1:9

Ans -(B) 6:1

4. SI unit of electrostatic potential is :
(A) Ohm
(B) Coulomb
(C) Volt
(D) Ampere

Ans -(C) Volt

5. SI unit of capacitance is :
(A) Volt
(B) Ampere
(C) Coulomb
(D) Farad

Ans -(D) Farad

6. On introducing a dielectric material between two positive charges situated in air, the repulsive force between them will be:
(A) increased
(B) decreased
(C) the same
(D) zero

Ans – (B) decreased

7. A potential difference of 12V is applied across the ends of a 4 kΩ resistor. How much current is flowing through it ?
(a) 3 mA
(b) 3 A
(c) 4 A
(d) 48 mA

Ans – (a) 3 mA

HBSE Class 12 Physics Chapter 3 Current Electricity MCQ Important Questions 2024-25

1. The relation between electric current (I) and drift velocity (V_d) is :
(A) I= neV_d
(B) I = neAV_d

(D) $\displaystyle {{V}_{d}}=\frac{{neA}}{I}$

Ans -(B) I = neAV_d

2. The relation between current density (j) and electric current ( I ) is :
(A) j= V_dlA
(B) $\displaystyle j=\frac{A}{I}$
(C) $\displaystyle j=\frac{I}{A}$
(D) j = IA

Ans -(C) $\displaystyle j=\frac{I}{A}$

3. SI unit of electric current is:
(A) Volt
(B) Coulomb
(C) Ampere
(D) Farad

Ans -(C) Ampere

4. The relation between current density (j) and drift velocity (V_d) is :
(A) j = neV_d
(B) j = ne / V_d
(C) j = V_d / ne
(D) j = 1 / neV_d

Ans -(A) j = neV_d

5. “Ohm-metre” is unit of:
(A) Resistance
(B) Current density
(C) Resistivity
(D) Conductivity

Ans -(C) Resistivity

6. How much current is flowing through a 5 kΩ resistor when a potential difference of 5V is applied across its ends?
(A) 1 μA
(B) 1 mA
(C) 1 A
(D) 5 A

Ans -(B) 1 mA

7. How much current is flowing through a 20Ω resistor when a potential difference of 2V is applied across its ends ?
(A) 20 A
(B) 2 A
(C) 0.1 A
(D) 1.0 A

Ans -(D) 1.0 A

8. How much current is flowing through a 1 kΩ resistor when a potential difference of 2V is applied across its end?
(A) 2 μA
(B) 2 mA
(C) 2 A
(D) 1 A

Ans -(B) 2 mA

9. The length of a metallic wire of R ohm resistance is stretched two times its initial length. Its new resistance is :
(A) 2R
(B) 4R
(C) 6R
(D) 8R

Ans -(D) 8R

10. The length of a metallic wire of R ohm resistance is stretched four times its initial length. Its new resistance is:
(A) 8R
(B) 4R
(C) 12R
(D) 16R

Ans -(D) 16R

11. The unit of Specific resistance is :
(A) ohm-m
(B) ohm-m^-1
(C) ohm^-1-m^-1
(D) ohm^-1-m

Ans -(A) ohm-m

12. The length of a metallic wire of R ohm resistance is stretched n times its initial length. Its new resistance is :
(A) nR
(B) 2nR
(C) n²R
(D) n⁴R

Ans -(C) n²R

13. The best instrument for accurate measurement of emf of a cell is :
(A) Wheatstone bridge
(B) Ammeter
(C) A Potentiometer
(D) Voltmeter

Ans -(C) A Potentiometer

14. With the increase of temperature, the resistivity of a semiconductor:
(A) Decreases
(B) Increases
(C) May increase or decrease
(D) Does not change

Ans -(A) Decreases

15. With the increase in length of a conductor, its resistivity :
(A) Increases
(B) Decreases
(C) May increase or decrease
(D) Does not change

Ans -(D) Does not change

16. With the increase of temperature, the resistivity of a metal :
(A) Increases
(B) Decreases
(C) May increase or decrease
(D) Does not change

Ans -(A) Increases

17. The resistivity of a conductor with increase in temperature:
(A) increases
(B) decreases
(C) may increase or decrease
(D) does not change

Ans -(A) increases

18. With the increase of area of cross-section of a conductor, its resistivity :
(A) Increases
(B) Decreases
(C) May increase or decrease
(D) Does not change

Ans -(D) Does not change

19. With decrease in temperature, the resistivity of a conductor:
(A) increases
(B) decreases
(C) may increases or decreases
(D) does not change

Ans -(B) decreases

20. With increase in temperature the conductivity of a conductor:
(A) remains same
(B) decreases
(C) increases
(D) may increase or decrease

Ans -(C) increases

21. The conductivity of a semi-conductor with increase in temperature:
(A) decreases
(B) increases
(C) remains same
(D) may increase or decrease

Ans – (B) increases

22. With decrease in temperature, the mobility of a conductor:
(A) increases
(B) decreases
(C) may increase or decrease
(D) does not change

Ans -(A) increases

23. With increase in temperature, the mobility of electrons in a conductor :
(A) increases
(B) decreases
(C) may increase or decrease
(D) does not change

Ans -(B) decreases

24. The graph between voltage (v) and current (i) for a conductor is a straight line which makes an angle θ with x-axis (representing i). The resistance of the conductor will be:
(A) tan θ
(B) cot θ
(C) sin θ
(D) cos θ

Ans -(A) tan θ

25. The graph between voltage (v) and current (i) for a conductor is a straight line which makes an angle θ with y-axis (representing i). The resistance of the Conductor will be:
(A) tanθ
(B) cotθ
(C) sinθ
(D) cosθ

Ans -(B) cotθ

26. 1 mA current is flowing through a conductor of 2 kΩ resistance. How much power is lost in it?
(a) 0.2 W
(b) 2 mW
(c) 2 W
(d) 2 kW

Ans – (b) 2 mW

27. The current-voltage (I-V) graph for a given metallic wire at two temperatures T₁and T₂are shown in Figure. Then :
(a) T₁ = T₂
(b) T₁ > T₂
(c) T₂> T₁
(d) None of the above

Ans – (c) T₂> T₁

28. Assertion (A) : The resistivity of a n-type semiconductor decrease with an increase in temperature.
Reason (R) : The rate of collision between free electrons and the ions increase with an increase in temperature.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Both Assertion (A) and Reason (R) are false.

Ans – (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

HBSE Class 12 Physics Chapter 4 Moving Charges and Magnetism MCQ Important Questions 2024-25

1. A moving charge produces :
(A) Electric field only
(B) Magnetic field only
(C) Both Electric and Magnetic fields
(D) None of the fields

Ans -(C) Both Electric and Magnetic fields

2. A proton enters into a uniform magnetic field perpendicularly to it. The path of the proton would be:
(A) Elliptical
(B) Circular
(C) Parabolic
(D) Linear

Ans – (B) Circular

3. An electron enters into a uniform magnetic field perpendicularly to it. The path of the electron would be:
(A) Elliptical
(B) Circular
(C) Parabolic
(D) Linear

Ans -(B) Circular

4. The force (F) acting on a particle of charge q moving with velocity (v) in magnetic field (B) is:
(A) $\displaystyle \frac{q}{{\overrightarrow{v}\times \overrightarrow{B}}}$
(B) $\displaystyle \frac{{\overrightarrow{v}\times \overrightarrow{B}}}{q}$
(C) $\displaystyle q(\overrightarrow{v}\times \overrightarrow{B})$
(D) $\displaystyle \overrightarrow{v}\times \overrightarrow{q}\times \overrightarrow{B}$

Ans -(C) $\displaystyle q(\overrightarrow{v}\times \overrightarrow{B})$

5. The force (F) acting on a particle of charge q moving with velocity ( $\displaystyle \overrightarrow{v}$ ) parallel to magnetic field ( $\displaystyle \overrightarrow{B}$ ) is :
(A) $\displaystyle \frac{q}{{\overrightarrow{v}\times \overrightarrow{B}}}$
(B) $\displaystyle \frac{{\overrightarrow{v}\times \overrightarrow{B}}}{q}$
(C) $\displaystyle q(\overrightarrow{v}\times \overrightarrow{B})$
(D) Zero

Ans -(C) $\displaystyle q(\overrightarrow{v}\times \overrightarrow{B})$

6. The magnetic field at distance r from a straight conductor of infinite length carrying current I, is given by : Most Important

(A) $\displaystyle \frac{{{{\mu }_{0}}I}}{{2\pi r}}$

(B) $\displaystyle \frac{{{{\mu }_{0}}I}}{{2r}}$
(C) μ₀nI
(D) Zero

Ans -(A) $\displaystyle \frac{{{{\mu }_{0}}I}}{{2\pi r}}$

7. The magnetic field at the centre of a circular coil of radius r and carrying current I, is given by: Most Important
(A) Zero
(B) μ₀nI
(C) $\displaystyle \frac{{{{\mu }_{0}}I}}{{2\pi r}}$

(D) $\displaystyle \frac{{{{\mu }_{0}}I}}{{2r}}$

Ans -(D) $\displaystyle \frac{{{{\mu }_{0}}I}}{{2r}}$

8. Two magnetic lines of forces :
(A) Cut each other at the neutral point
(B) Cut each other near north or south pole
(C) Never cut each other
(D) Cut at the middle of magnet

Ans – (C) Never cut each other

9. Moving coil galvanometer is converted into voltmeter by:
(A) Connecting high resistance in parallel
(B) Connecting low resistance in parallel
(C) Connecting high resistance in series
(D) Connecting low resistance in series

Ans -(C) Connecting high resistance in series

10. Moving coil galvanometer is converted into ammeter by:
(A) Connecting high resistance in parallel
(B) Connecting low resistance in parallel
(C) Connecting high resistance in series
(D) Connecting low resistance in series

Ans -(B) Connecting low resistance in parallel

11. The torque acting on an electric dipole of dipole moment P placed parallel to an electric field E will be:
(A) PE
(B) PE cosθ
(C) Zero
(D) None

Ans -(C) Zero

12. The torque acting on an electric dipole of dipole moment P placed at an angle 90° to the electric field E will be :
(A) PE
(B) PE cosθ
(C) PE / sinθ
(D) Zero

Ans -(D) Zero

13. Direction of Induced Current is given by :
(A) Lenz’s Law
(B) Fleming’s Left Hand Rule
(C) Biot-Savert’s Law
(D) Ampere’s Law

Ans -(A) Lenz’s Law

14. The SI unit of magnetic dipole moment of a bar magnet is :
(a) Am^-2
(b) Am^-1
(c) Am
(d) Am²

Ans – (d) Am²

HBSE Class 12 Physics Chapter 5 Magnetism and Matter MCQ Important Questions 2024-25

1. The magnetic susceptibility of diamagnetic substance is :
(A) small and positive
(B) large and positive
(C) small and negative
(D) large and negative

Ans – (C) small and negative

2. Magnetic susceptibility of a paramagnetic substance is :
(A) small and positive
(B) small and negative
(C) large and positive
(D) large and negative

Ans – (A) small and positive

3. Magnetic susceptibility of a ferromagnetic substance is :
(A) large and negative
(B) large and positive
(C) small and negative
(D) small and positive

Ans – (B) large and positive

4. The tangent to the magnetic field line at a given point represents the direction of the net :
(A) Electric Force (F)
(B) Electric Field (E)
(C) Magnetic Field (B)
(D) Electric Current (I)

Ans – (C) Magnetic Field (B)

5. At a given place the horizontal and vertical components of earth are equal. The angle of dip at that place will be :
(A) 0°
(B) 45°
(C) 60°
(D) 90°

Ans -(B) 45°

6. The horizontal component of Earth’s magnetic field is zero at:
(A) Magnetic poles
(B) Geographic poles
(C) Every Place
(D) Magnetic equatorial

Ans -(A) Magnetic poles

7. The magnetic field lines of a magnet form:
(A) Continuous curve
(B) Continuous closed loops
(C) Like the electric dipole
(D) None of the above .

Ans – (B) Continuous closed loops

8. In the magnetic meridian at a certain location, the horizontal component of earth’s magnetic field is 0.16 G and angle of dip is 60°. The earth’s magnetic field at this location is :
(A) 0.32 G
(B) 0.36 G
(C) 0.18 G
(D) 0.16 G

Ans -(A) 0.32 G

9. In the magnetic meridian at a certain location, earth’s magnetic field is 0.52 G and the angle of dip is 60°. The horizontal component of earth’s magnetic field at this location is:
(A) 0.36 G
(B) 0.52 G
(C) 0.13 G
(D) 0.26 G

Ans -(D) 0.26 G

10. In the magnetic meridian of a certain place, earth’s magnetic field is 0.38 G and the angle of dip is 30°. The horizontal component of earth’s magnetic field at this location is:
(A) 0.19 G
(B) 0.38 G
(C) 0.33 G
(D) 0.57 G

Ans -(C) 0.33 G

11. In the magnetic meridian at a certain place, earth’s magnetic field is 0.32 G and its horizontal component is 0.16 G. The angle of dip of earth’s magnetic field at this location is :
(A) 30°
(B) 60°
(C) 45°
(D) 22°

Ans -(B) 60°

12. The relation between magnetic susceptibility χ and relative permeability μ_rof a magnetic material is :
(a) μ_r= 1 + χ
(b) μ_r= 1 + χ²
(c) μ_r= 1/χ
(d) μ_r= 1 – χ²

Ans – (a) μ_r= 1 + χ

HBSE Class 12 Physics Chapter 6 Electromagnetic Induction MCQ Important Questions 2024-25

1. The magnetic flux threading a wire loop placed in a magnetic field depend upon :
(A) Area of the loop
(B) Magnitude of the field
(C) Orientation of the loop with respect to the field
(D) All of the above

Ans -(D) All of the above

2. The magnetic flux linked with a coil is decreased from 5 Weber to 2 Weber in 1 second. The induced electromotive force in the coil is :
(A) 3 Volt
(B) 30 Volt
(C) 300 Volt
(D) .3 Volt

Ans -(A) 3 Volt

3. The magnetic flux threading a wire loop placed in a magnetic field does not depend upon:
(A) Area of the loop
(B) Magnitude of the field
(C) Orientation of the loop with respect to the field
(D) Shape of the loop

Ans -(D) Shape of the loop

4. The magnetic flux linked with a coil is decreased from 1 Weber to .1 Weber in 1 second. The induced electromotive force in the coil is :
(A) 9 Volt
(B) 90 Volt
(C) .9 Volt
(D) .09 Volt .

Ans -(C) .9 Volt

5. Lenz’s law is a consequence of the law of conservation of :
(A) Charge
(B) Momentum
(C) Energy
(D) Mass

Ans -(C) Energy

6. On what factor does the coefficient of mutual inductance of two coils not depend?
(A) Filled with medium inside solenoid
(B) Separation between coils
(C) Their relative orientation
(D) Their resistances

Ans -(D) Their resistances

7. For a coil having self-inductance 3 mH current flows at a rate of 10³ ampere/sec. in it. The emf induced in it is :
(A) 1 Volt
(B) 2 Volt
(C) 3 Volt
(D) 4 Volt

Ans -(C) 3 Volt

8. For a coil-having self Inductance 2 mH, current 10³ ampere/sec in it. The emf induced in it is :
(A) 1 volt
(B) 2 volt
(C) 3 volt
(D) 4 volt

Ans -(B) 2 volt

HBSE Class 12 Physics Chapter 7 Alternating Current MCQ Important Questions 2024-25

1. An alternating current i = I₀ sin (ωt + π/2) is flowing in a circuit. The r.m.s. value of this current is:
(A) I₀
(B) I₀/ω
(C) I₀/√2
(D) ωI₀

Ans -(C) I₀/√2

2. An alternating current i= I₀ sin(ωt-π/2) is flowing in a circuit. The r.m.s. value of this current is:
(A) I₀
(B) I₀/ω
(C) I₀/√2
(D) ωI₀

Ans -(C) I₀/√2

3. An alternating current i = I₀sinωt is flowing in a circuit. The r.m.s. value of this current is:
(A) I₀/√2
(B) 2I₀
(C) I₀
(D) √2 I₀

Ans -(A) I₀/√2

4. The voltage across the ends of a resistor is v=V₀ sin wt. The r.m.s. value of this voltage is :
(A) V₀
(B) 2 V₀
(C) V₀/√2
(D) √2 V₀

Ans -(C) V₀/√2

5. An ac source is connected to a capacitor. The phase difference between applied voltage and the current flowing through it is :
(A) 0°
(B) 90°
(C) 180°
(D) 45°

Ans -(B) 90°

6. Phase difference between voltage and current when an ac source is connected to inductor is :
(A) 0°
(B) 90°
(C) 45°
(D) 180°

Ans -(B) 90°

7. An ac source is connected to a resistor. The phase difference between applied voltage and the current flowing through it is:
(A) 0°
(B) 45°
(C) 90°
(D) 180°

Ans -(A) 0°

8. The power factor for a purely capacitive circuit is :
(A) 1
(B) √2
(C) $\displaystyle \frac{1}{{\sqrt{2}}}$
(D) Zero

Ans -(D) Zero

9. The power factor for a purely inductive ac circuit is :
(A) 1
(B) Zero
(C) $\displaystyle \frac{1}{{\sqrt{2}}}$
(D) √2

Ans -(B) Zero

10. The path difference equivalent to π/4 phase difference is :
(A) λ
(B) λ/2
(C) λ/4
(D) λ/8

Ans -(C) λ/4

11. Two electric bulbs of 40 watt each are connected in series. The power consumed by the combination will be:
(A) 20 watt
(B) 60 watt
(C) 80 watt
(D) 100 watt

Ans -(C) 80 watt

12. For an alternating current i = I₀ sinωt passing through a resistor R, how much is the average power loss due to Joule heating ?
(a) I₀²R
(b) 1/2 I₀²R
(c) 4 I₀²R
(d) 2 I₀²R

Ans – (b) 1/2 I₀²R

13. What is the value of resonant frequency ω₀of a series LCR circuit ?
(a) LC
(b) 1 / LC
(c) √LC
(d) 1 / √LC

Ans – (d) 1 / √LC

HBSE Class 12 Physics Chapter 8 Electromagnetic Waves MCQ Important Questions 2024-25

1. In the electromagnetic wave, the phase difference between electric field and magnetic field is :
(A) 0
(Β) π/4
(C) π/2
(D) π

Ans -(A) 0

2. Microwaves are the electromagnetic waves with frequency in the range of:
(A) Micro hertz
(B) Mega hertz
(C) Giga hertz
(D) Hertz

Ans -(C) Giga hertz

3. Which of the following electromagnetic waves has smaller wavelengths?
(A) X-rays
(B) Microwaves
(C) γ-rays
(D) Radiowaves

Ans -(A) X-rays

4. Which of the following are electromagnetic waves ?
(A) Sound waves
(B) α-rays
(C) B-rays
(D) γ-rays

Ans -(D) γ-rays

5. Which of the following are not electromagnetic waves ?
(A) Gamma-rays
(B) B-rays
(C) X-rays
(D) Infrared-rays

Ans -(B) B-rays

6. Which of the following has highest frequency ?
(A) Ultraviolet rays
(B) Long radio waves
(C) Gamma rays
(D) X-rays

Ans – (C) Gamma rays

7. Which of the following has lowest wave-length ?
(A) Gamma rays
(B) X-rays
(C) Infrared rays
(D) Short radio waves

Ans – (A) Gamma rays

8. Which of the following has highest wave- length ?
(A) Gamma rays
(B) X-rays
(C) Ultraviolet rays
(D) Radio waves

Ans -(D) Radio waves

9. Which of the following has lowest frequency?
(A) Ultraviolet rays
(B) Long radio waves
(C) Gamma rays
(D) X-rays

Ans – (B) Long radio waves

10. What is the value of speed of γ-rays in vacuum?
(A) 2c
(B) c
(c) $\displaystyle \frac{c}{2}$
(D) $\displaystyle \frac{c}{{\sqrt{2}}}$

Ans -(B) c (Here c is speed of light in vaccum)

11. What is the value of speed of X-rays in vacuum?
(A) 2 c
(B) c
(C) $\displaystyle \frac{c}{2}$
(D) $\displaystyle \frac{c}{{\sqrt{2}}}$

Ans -(B) c

12. The wavelength of a wave with frequency 3×10⁹Hz will be:
(A) 0.1 m
(B) 1 m
(C) 10⁹ m
(D) 10^-2 m

Ans -(A) 0.1 m

13. The wavelength of a wave having frequency 3×10¹² Hz will be:
(A) 3×10⁸ m
(B) 3×10⁴ m
(C) 10^-4m
(D) 10⁴ m

Ans -The wavelength of a wave having frequency 3×10¹² Hz will be:

14. Which of the following have lowest wavelength in vaccum?
(a) Infrared waves
(b) X – rays
(c) Visible light waves
(d) Radio waves

Ans – (b) X – rays

HBSE Class 12 Physics Chapter 9 Ray Optics and Optical Instruments MCQ Important Questions 2024-25

1. The angle of minimum deviation for a prism is 30° and the angle of prism is 60°. The refractive index of the material of the prism is :
(A) 2
(B) √2
(C) 1.5
(D) 1/√2

Ans -(B) √2

2. For yellow light incident on a prism of angle 60°, the angle of minimum deviation is 30°. The angle of incidence in this situation is :
(A) 30°
(B) 45°
(C) 60°
(D) 75°

Ans -(B) 45°

3. For a normal human eye the least distance of distinct vision is:
(A) 1 cm
(B) 2.5 cm
(C) 50 cm
(D) 25 cm

Ans -(D) 25 cm

4. Speed of Light in air is 3×10⁸ m/s. For the water of refractive Index 4/3, the speed of light will be:
(A) 1.5 x 10⁸ m/s
(B) 2×10⁸m/s
(C) 1×10⁸ m / s
(D) 2.25×10⁸ m/s

Ans – (D) 2.25×10⁸ m/s

5. Speed of light in air is 3 x 10⁸ m/s. For the glass of refractive index 1.5, speed of light in glass will be:
(A) 1.5 x 10⁸ m/s
(B) 2 x 10⁸ m/s
(C) 1 x 10⁸ m/s
(D) 2.5 x 10⁸ m/s

Ans – (B) 2 x 10⁸ m/s

6. Condition of minimum deviation for a Prism is:
(A) Angle of Incidence > Angle of Emergence
(B) Angle of Incidence = Angle of Emergence
(C) Angle of Incidence < Angle of Emergence
(D) None of the above

Ans -(B) Angle of Incidence = Angle of Emergence

7. Prism designed to bend light by 90° or 180° make use of :
(A) dispersion
(B) total internal reflection
(C) reflection
(D) diffraction

Ans -(B) total internal reflection

8. For small angle A prism (Refractive Index n), angle of Minimum deviation D_m is :
(A) $\displaystyle {{D}_{m}}=\frac{{n-1}}{A}$

(B) D_m = (n-1) A

(D) D_m =n-1

Ans -(B) D_m = (n-1) A

9. The angle of minimum deviation for a prism is δm and the angle of prism is A. The refractive index of the material of the prism is :

(A) $\displaystyle \sin \left( {\frac{{A+\delta m}}{2}} \right)$

(B) $\displaystyle \sin \frac{A}{2}$

(D) $\displaystyle \frac{{\sin \left( {\frac{{A+\delta m}}{2}} \right)}}{{\sin A/2}}$

Ans -(C) $\displaystyle \frac{{\sin A/2}}{{\sin \left( {\frac{{A+\delta m}}{2}} \right)}}$

10. The working of a totally reflecting prism is based upon :
(A) Total internal reflection
(B) Reflection
(C) Refraction
(D) None of these

Ans -(A) Total internal reflection

11. Optical fibres works on the phenomenon of:
(A) Dispersion
(B) Refraction
(C) Scattering
(D) Total Internal Reflection

Ans -(D) Total Internal Reflection

12. Mirage is a phenomena due to:
(A) Reflection
(B) Dispersion
(C) Scattering
(D) Total Internal Reflection

Ans – (D) Total Internal Reflection

13. Two lens of power 5D and – 3D are placed in contact. Focal length of the combination will be:
(A) 50 cm
(B) – 50 cm
(C) 25 cm
(D) – 25 cm

Ans -(A) 50 cm

14. The focal length of a lens of power +2D is :
(A) + 50cm
(B) – 50cm
(C) + 2 cm
(D) – 2 cm

Ans -(A) + 50cm

15. Two lens of power 8D and – 4D are placed in contact. Focal length of the combination will be:
(A) 50cm
(B) -50 cm
(C) 25 cm
(D) – 25cm

Ans -(C) 25 cm

16. The two Surfaces of a bi-convex Lens have equal radii of curvature R and its refractive Index n is 1.5. The focal Length of the Lens will be:
(A) R/2
(B) R
(C) -R
(D) 2R

Ans – (B) R

17. A thin convex lens of focal length 15 cm is placed in contact with a thin concave lens of focal length 15 cm. What is the power of the combination ?
(A) 0 D
(B) ∞ D
(C) 3D
(D) 6 D

Ans – (A) 0 D

18. A thin convex lens of focal length 10 cm is placed in contact with a thin concave lens of focal length 10 cm. What is the power of the combination ?
(A) ∞ D
(B) +5 D
(C) 0 D
(D) −5 D

Ans -(A) ∞ D

19. A thin convex lens of focal length 15 cm is placed in contact with a thin concave lens of focal length 10 cm. What is the focal length of the combination ?
(A) + 25 cm
(B) +5 cm
(C) – 30 cm
(D) – 5 cm

Ans – (C) – 30 cm

20. Double-convex lenses are to be manufactured from a glass of refractive index 1.5, with both faces of the same radius of curvature. If the focal length is to be 20 cm, radius of curvature required is:
(A) 10cm
(B) 15 cm
(c) 20 cm
(D) 30cm

Ans -(c) 20 cm

21. A thin convex lens of focal length 30 cm is placed in contact with a thin concave lens of focal length 20 cm. What is the focal length of the combination ?
(A) +50 cm
(B) -60 cm
(C) +10 cm
(D) -10 cm

Ans – (B) -60 cm

22. The focal length of a lens of power +4D is :
(A) – 25cm
(B) + 25 cm
(C) – 4 cm
(D) + 4 cm

Ans -(A) + 25cm

23. The focal length of a lens of power -4D is :
(A) + 25 cm
(B) + 4 cm
(C) – 25cm
(D) – 4 cm

Ans -(C) – 25cm

24. The refractive index of a medium having critical angle of 60° is :
(a) √3 / 2
(b) 2 / √3
(c) 1 / 3
(d) 1 / √2

Ans – (b) 2 / √3

25. Assertion (A) : When a narrow beam of white light passes through a glass prism, it undergoes dispersion.
Reason (R) : The refractive index of medium for different wavelengths (colours) is different.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Both Assertion (A) and Reason (R) are false.

Ans – (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

HBSE Class 12 Physics Chapter 10 Wave optics MCQ Important Questions 2024-25

1. The ratio of the intensities of two light waves is 16 : 9. The ratio of maximum and minimum intensities in their interference pattern will be:
(A) 4:3
(B) 49:1
(C) 25:7
(D) 256 : 81

Ans -(A) 4:3

2. In Young’s double slit experiment, the screen is moved away from the plane of the slits, angular separation of the Fringes:
(A) remain constant
(B) increases
(C) decreases
(D) interference pattern disappears

Ans -(C) decreases

3. In Young’s double slit experiment, the monochromatic source is replaced by another monochromatic source of shorter wavelength, then actual separation of the Fringes : Most Important
(A) remain constant
(B) increases
(C) decreases
(D) None of the above

Ans -(C) decreases

4. Which phenomenon illustrates particle nature of light waves?
(A) Interference
(B) Diffraction
(C) Polarization
(D) None of the above

Ans -(B) Diffraction

5. Which phenomenon illustrates the nature of light waves?
(A) Interference
(B) Diffraction
(C) Polarization
(D) None of the above

Ans -(A) Interference

6. Phenomenon of splitting of light into its constituent colours is known as:
(A) Scattering
(B) Diffraction
(C) Refraction
(D) Dispersion

Ans – (D) Dispersion

7. Two light waves of equal amplitude and wave length are super imposed. The amplitude of the resultant wave will be maximum when the phase difference between them is :
(A) Zero
(B) π/2
(C) π
(D) π/4

Ans -(A) Zero

HBSE Class 12 Physics Chapter 11 Dual Nature of Radiations and Matter MCQ Important Questions 2024-25

1. The charge on an electron is:
(A) 0 C
(B) 1 C
(C) -2.6 x 10^-19 C
(D) -1.6 x 10^-19 C

Ans -(D) -1.6 x 10^-19 C

2. The charge on an Proton is :
(A) 0 C
(B) 1 C
(C) – 2.6 × 10⁺¹⁹ C
(D) + 1.6 x 10^-19 C

Ans – (D) + 1.6 x 10^-19 C

3. In 1905, which scientist proposed a radically new picture of electromagnetic radiation to explain photoelectric effect?
(A) Millikan
(B) Einstein
(C) Rutherford
(D) Compton

Ans – (B) Einstein

4. Which scientist verified Einstein’s photoelectric equation with great precision, for a number of alkali metals over a wide range of radiation frequencies?
(A) Millikan
(B) Einstein
(C) Rutherford
(D) Compton

Ans – (A) Millikan

5. Awarded the Nobel prize in physics for his contribution to theoretical physics and the photoelectric effect in 1921 was :
(A) Millikan
(B) Einstein
(C) Rutherford
(D) Compton

Ans – (B) Einstein

6. The stopping potential for photoelectrons depends upon :
(A) Frequency of incident light only
(B) Material of the cathode only
(C) Both the frequency of incident light and the material of the cathode
(D) Intensity of incident light

Ans -(A) Frequency of incident light only

7. Electron emission from a metallic surface is possible only, when Frequency of the incident Light is :
(A) Less Then threshold Frequency
(B) Half of the Threshold Frequency
(C) Greater than the Threshold Frequency
(D) No effect of Frequency

Ans -(C) Greater than the Threshold Frequency

8. Electron emission from a metallic surface is possible only, when wavelength of the incident light is:
(A) less than threshold wavelength
(B) twice of the threshold wavelength
(C) greater than the threshold wavelength
(D) no effect of wavelength

Ans -(A) less than threshold wavelength

9. Which of the following has minimum stopping potential?
(A) Blue
(B) Yellow
(C) Voilet
(D) Red

Ans -(D) Red

10. For which of the following stopping potential required is maximum ?
(A) Red
(B) Green
(C) Yellow
(D) Blue

Ans -(D) Blue

11. The electrons ejected from metals due to effect of light are called:
(A) Primary electrons
(B) Secondary electrons
(C) Photo electrons
(D) Thermions.

Ans -(C) Photo electrons

12. K is the kinetic energy of a moving particle of mass m. The de-Broglie wavelength λ associated with this particle is :
(a) h / K
(b) h / 2K
(c) 2h / √2mk
(d) h / √2mk

Ans – (d) h / √2mk

13. Assertion (A) : The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.
Reason (R) : Work function is the least energy required by an electron to come out of the metal.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Both Assertion (A) and Reason (R) are false.

Ans – (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

HBSE Class 12 Physics Chapter 12 Atoms MCQ Important Questions 2024-25

1. The energy of an atom in ground state is -4.9 eV. The ionisation energy of this atom is :
(A) 2.45 eV
(B) 13.6 eV
(C) 9.8 eV
(D) 4.9 eV

Ans -(D) 4.9 eV

2. Whose model of atom is also called nuclear model of atom ?
(A) Thomson
(B) Rutherford
(C) de Broglie
(D) Bohr

Ans – (B) Rutherford

3. The charge on an atom is :
(A) 0 C
(B) 1 C
(C) – 1.6 x 10⁺¹⁹ C
(D) 1.6 × 10^-19 C

Ans – (A) 0 C

4. According to Rutherford’s experiments, the size of nucleus is about:
(A) 10^-11 m to 10^-10 m
(B) 10^-13 m to10^-12 m
(C) 10^-15 m to10^-14 m
(D) 10^-12 m to10^-11 m

Ans – (C) 10^-15 m to 10^-14 m

5. In hydrogen atom, the potential energy of electron in an orbit of radius r is given by :

(A) $\displaystyle -\frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{r}$

(B) $\displaystyle \frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{{2r}}$

(D) $\displaystyle -\frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{{2r}}$

Ans -(A) $\displaystyle -\frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{r}$

6. In hydrogen atom, the Kinetic energy of electron in an orbit of radius r is given by:

(A) $\displaystyle -\frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{r}$

(B) $\displaystyle \frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{{2r}}$

(D) $\displaystyle -\frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{{2r}}$

Ans -(B) $\displaystyle \frac{1}{{4\pi {{\in }_{0}}}}.\frac{{{{e}^{2}}}}{{2r}}$

7. The total energy of an electron in the first excited state of the hydrogen atom is about -3.4 eV. Kinetic energy of the electron in this state is :
(A) -3.4 eV
(B) 6.8 eV
(C) -6.8 eV
(D) 3.4 eV

Ans -(D) 3.4 eV

8. The total energy of an electron in the first excited state of the hydrogen atom is about -3.4 eV. Potential energy of the electron in this state is :
(A) – 3.4 eV
(B) 6.8 eV
(C) -6.8 eV
(D) -1.7 eV

Ans -(C) -6.8 eV

9. The ground state total energy of hydrogen atom is about -13.6 eV. Kinetic energy of the electron in this state is:
(A) – 13.6 eV
(B) 13.6 eV
(C) – 27.2 eV
(D) 27.2 eV

Ans -(B) 13.6 eV

10. The ionization energy of hydrogen atom is:
(A) 13.6 J
(B) 13.6 eV
(C) 1 eV
(D) 10.2 eV

Ans -(B) 13.6 eV

11. Which spectral series of hydrogen atom lies in the ultraviolet region ?
(A) Lyman
(B) Balmer
(C) Paschen
(D) Brackett

Ans -(A) Lyman

12. Which spectral series does not lie in the spectrum of hydrogen atom ?
(A) Special
(B) Lyman
(C) Balmar
(D) Paschen

Ans -(A) Special

13. Which spectral series of hydrogen atom lie in the visible region? Most Important
(A) Lyman
(B) Paschen
(C) Pfund
(D) Balmer

Ans -(D) Balmer

14. Which spectral series of hydrogen atom lie in the infrared region ?
(A) Lyman
(B) Paschen
(C) Balmer
(D) None of these

Ans -(B) Paschen

15. The de-Broglie wavelength associated with a moving particle is :
(A) directly proportional to its mass
(B) inversely proportional to its mass
(C) directly proportional to its energy
(D) directly proportional to its momentum

Ans -(D) directly proportional to its momentum

16. Who discovered the nucleus ?
(A) Thomson
(B) Bohr
(C) Rutherford
(D) de Broglie

Ans – (C) Rutherford

17. Which model of atom suggests that atom is a spherical cloud of positive charges with electrons embedded in it ?
(A) Rutherford model
(B) Bohr model
(C) Thomson model
(D) de Broglie

Ans – (C) Thomson model

18. de-Broglie wavelength associated with an electron, accelerated through a potential difference of V volt is:
(A) (1227/ √V) Å
(B) ( 1.227/ √V ) Å
(C) ( 12.27 /√V ) Å
(D) ( 122.7 /√V ) Å

Ans -(C) ( 12.27 /√V ) Å

19. A de-Broglie wavelength associated with an electron, accelerated through a potential difference of 100 Volt is :
(A) 1.127 Å
(B) 11.27 Å
(C) 12.27 Å
(D) 1.227 Å

Ans -(D) 1.227 Å

20. de-Broglie wavelength associated with an electron, accelerated through a potential difference of 100 Volt is :
(A) .1127 nm
(B) 1.127 nm
(C) .127 nm
(D) .1227 nm

Ans -(D) .1227 nm

21. The de Broglie wavelength associated with an electron accelerated through a potential difference of 64 V is:
(A) 1.227 nm
(B) 0.153 nm
(C) 1.53 nm
(D) 12.27 nm

Ans -(B) 0.153 nm

22. The de Broglie wavelength associated with an electron accelerated through a potential difference of 121 V is:
(A) 1.227 nm
(B) 12.270 nm
(C) 0.112 nm
(D) 11.200 nm

Ans -(C) 0.112 nm

23. An electron is moving under a potential difference of 1 volt, what will be the de-Broglie wavelength?
(A) 1 m
(B) 1.227 m
(C) 12.27 Å
(D) 1.227 Å

Ans -(C) 12.27 Å

24. What is the de-Broglie wavelength associated with an electron moving under a potential difference of 10⁴ volts will be :
(A) 1m
(B) 12.27 Å
(C) 0.1227 Å
(D) 1.227 m

Ans -(C) 0.1227 Å

25. de-Broglie wavelength associated with an electron moving under a potential difference of 150 volts will be:
(A) 12.27 Å
(B) 1 Å
(C) 1.227 Å
(D) 1 m

Ans -(C) 1.227 Å

HBSE Class 12 Physics Chapter 13 Nuclei MCQ Important Questions 2024-25

1. A positively charged body has in it:
(A) Excess of Neutrons
(B) Excess of Electrons
(C) Deficiency of Electrons
(D) Deficiency of Protons.

Ans -(C) Deficiency of Electrons

2. A negatively charged body has in it:
(A) Excess of Neutrons
(B) Excess of Electrons
(C) Deficiency of Electrons
(D) Excess of Protons

Ans -(B) Excess of Electrons

3. Number and type of nucleons in the nucleus of Deuterium (₁H²) will be:
(A) 2 protons
(B) 1 proton and 1 neutron
(C) 2 neutrons
(D) 1 proton and 1 electron

Ans – (B) 1 proton and 1 neutron

4. Two atoms have the same atomic number but different atomic mass. They will be:
(A) Isotopes
(B) Isobaric
(C) Isotones
(D) None of these

Ans -(A) Isotopes

5. All nuclides with same mass number A are called:
(A) Isobars
(B) Isotones
(C) Isotopes
(D) All of the above.

Ans -(A) Isobars

6. All nuclides with same Atomic number Z are called:
(A) Isobars
(B) Isotones
(C) Isotopes
(D) None of the above.

Ans -(C) Isotopes

7. Nuclides with same neutron number N but different atomic number Z are called :
(A) Isobars
(B) Isotones
(C) Isotopes
(D) None of the above

Ans -(B) Isotones

8. Number and type of nucleons in the nucleus of Helium ( ₂He⁴ ) will be :
(A) 2 protons
(B) 2 protons and 2 neutrons
(C) 2 protons and 2 electrons
(D) 2 neutrons

Ans -(B) 2 protons and 2 neutrons

9. The charge on a neutron is:
(A) 0 C
(B) 1.6 x 10^-19 C
(C) – 1.6 x 10^-19 C
(D) 1 C

Ans – (A) 0 C

10. The net charge on an atom of atomic number Z as a whole is :
(a) +Ze
(b) -Ze
(c) Zero
(d) +(Z – 1)e

Ans – (c) Zero

11. One atomic unit (1u) equals :
(a) 1.660539 x 10^-27Kg
(b) 1.660539 x 10^-23Kg
(c) 1.660539 x 10^-17Kg
(d) 1.660539 x 10^-13Kg

Ans – (a) 1.660539 x 10^-27Kg

HBSE Class 12 Physics Chapter 14 Semiconductor Electronics : Materials, Devices and Simple Circuits MCQ Important Questions 2024-25

1. At absolute zero temperature, a crystal of pure germanium behaves as:
(A) a perfect conductor
(B) a perfect insulator
(C) a semiconductor
(D) None of these

Ans -(B) a perfect insulator

2. In intrinsic semiconductor at room temperature, the numbers of electrons and holes are :
(A) Equal
(B) Zero
(C) Unequal
(D) Infinite

Ans -(A) Equal

3. In a p-type semiconductor the minority charge carriers are:
(A) Electron
(B) Hole
(C) Electron and Hole
(D) None of these

Ans -(A) Electron

4. Which dopant cannot be used to make silicon (Si) a p-type semi-conductor ?
(A) In
(B) Al
(C) B
(D) P

Ans – (D) P

5. Which dopant cannot be used to make Germanium (Ge) a p-type semiconductor?
(A) P
(B) In
(C) B
(D) Al

Ans -(B) In

6. In a n-type Semi Conductor the minority charge carriers are:
(A) Electron
(B) Hole
(C) Electron and hole
(D) None of these

Ans -(B) Hole

7. Which dopant cannot be used to make Germanium (Ge) an n-type semiconductor ?
(A) P
(B) In
(C) As
(D) Sb

Ans -(B) In

8. Which dopant cannot be used to make silicon (Si) an n-type semi-conductor ?
(A) B
(B) As
(C) P
(D) Sb

Ans -(A) B

9. When a forward biased is applied to a p-n junction, it :
(A) Raises the potential barrier
(B) Reduces the majority carrier current to zero
(C) Lowers the potential barrier
(D) None of the above

Ans -(C) Lowers the potential barrier

10. When a reverse biased is applied to a p-n junction, it :
(A) Raises the potential barrier
(B) Increases the majority carrier current
(C) Lowers the potential barrier
(D) None of the above.

Ans -(A) Raises the potential barrier

11. In an unbiased p-n junction, holes diffuse from the p-region to n-region, because :
(A) Free electron in the n-region attract them
(B) They move across the junction by the potential difference
(C) Hole concentration in p-region is more as compared to n-region
(D) All of the above

Ans -(C) Hole concentration in p-region is more as compared to n-region

12. Energy band of substance shown in the figure where V is valence band and C is conduction band:

Substance is : Most important
(A) Metal
(B) Semiconductor
(C) Insulator
(D) None of the above

Ans -(C) Insulator

13. Energy band of a substance is shown in Figure. Where V is valence band and C is conduction band.

This substance is :
(A) Conductor
(B) Semi conductor
(C) Insulator
(D) Diamond

Ans -(B) Semi conductor

14. Carbon, silicon and germanium have four valence electrons each. These are characterized by valence band and conduction bands separated by energy band gap respectively equal to (E_g)_c , (E_g)_si and (E_g)_Ge . Which of the following statement is true?
(A) (E_g) si < ((E_g)_Ge < (E_g)_c
(B) (E_g)_c < (E_g)_Ge > (E_g)_si
(C) (Eg)_c > (E_g)_si > (E_g)_Ge
(D) (E_g)_c = (E_g)_si = (E_g)_Ge

Ans – (C) (Eg)_c > (E_g)_si > (E_g)_Ge

15. Assertion (A) : The electrical conductivity of an intrinsic semiconductor increases on doping.
Reason (R) : Doping always increases the number of free electrons in a pure semiconductor.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Both Assertion (A) and Reason (R) are false.

Ans – (c) Assertion (A) is true, but Reason (R) is false.

HBSE Class 12 Physics MCQ Important Question Answer 2025

HBSE Class 12 Physics Important MCQ Question Answer 2025

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HBSE Class 12 Physics Important MCQ Question Answer 2025

HBSE Class 12 Physics Chapter 1 Electric Charges and Fields MCQ Important Questions 2024-25

HBSE Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance MCQ Important Questions 2024-25

HBSE Class 12 Physics Chapter 3 Current Electricity MCQ Important Questions 2024-25

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HBSE Class 12 Physics Chapter 13 Nuclei MCQ Important Questions 2024-25

HBSE Class 12 Physics Chapter 14 Semiconductor Electronics : Materials, Devices and Simple Circuits MCQ Important Questions 2024-25

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