CLASS XII Physics MCQs

Class 10 Physics MCQs

Here are 30 Multiple Choice Questions (MCQs) for Class 10 Physics based on the NCERT syllabus. These questions cover topics from Light – Reflection and Refraction, Human Eye and the Colorful World, Electricity, and Magnetic Effects of Electric Current.

Light – Reflection and Refraction

1. The image formed by a plane mirror is:

a) Real and inverted

b) Virtual and erect

c) Real and erect

d) Virtual and inverted

2. The focal length of a concave mirror is 20 cm. Its radius of curvature is:

a) 10 cm

b) 20 cm

c) 40 cm

d) 5 cm

3. A concave mirror forms a real and inverted image of an object at a distance of 40 cm from the mirror. If the object is placed at 20 cm from the mirror, the image will be:

a) Real and inverted

b) Virtual and erect

c) Real and erect

d) Virtual and inverted

4. The refractive index of water is 1.33. The speed of light in water is:

a) \( 2.25 \times 10^8 \, \text{m/s} \)

b) \( 3 \times 10^8 \, \text{m/s} \)

c) \( 1.33 \times 10^8 \, \text{m/s} \)

d) \( 2.5 \times 10^8 \, \text{m/s} \)

5. A convex lens of focal length 10 cm forms a real image at a distance of 20 cm from the lens. The object distance is:

a) 10 cm

b) 20 cm

c) 30 cm

d) 40 cm

Human Eye and the Colorful World

6. The defect of vision in which a person cannot see distant objects clearly is called:

a) Myopia

b) Hypermetropia

c) Presbyopia

d) Astigmatism

7. The splitting of white light into its constituent colors is called:

a) Reflection

b) Refraction

c) Dispersion

d) Scattering

8. The color of the sky appears blue due to the phenomenon of:

a) Reflection

b) Refraction

c) Dispersion

d) Scattering

9. The power of a lens is +2.0 D. Its focal length is:

a) 50 cm

b) 100 cm

c) 200 cm

d) 20 cm

10. The far point of a myopic eye is 80 cm. The power of the lens required to correct this defect is:

a) -1.25 D

b) -2.5 D

c) -0.8 D

d) -1.5 D

Electricity

11. The SI unit of electric current is:

a) Volt

b) Ampere

c) Ohm

d) Watt

12. The resistance of a conductor is inversely proportional to its:

a) Length

b) Area of cross-section

c) Temperature

d) Material

13. Ohm's law is given by:

a) \( V = IR \)

b) \( I = VR \)

c) \( R = VI \)

d) \( V = I/R \)

14. The equivalent resistance of two resistors \( R_1 \) and \( R_2 \) connected in parallel is:

a) \( R_1 + R_2 \)

b) \( \frac{R_1 R_2}{R_1 + R_2} \)

c) \( \frac{R_1 + R_2}{R_1 R_2} \)

d) \( R_1 - R_2 \)

15. The heating effect of electric current is used in:

a) Electric bulb

b) Electric heater

c) Electric iron

d) All of the above

Magnetic Effects of Electric Current

16. The direction of the magnetic field around a current-carrying conductor is given by:

a) Fleming's left-hand rule

b) Fleming's right-hand rule

c) Right-hand thumb rule

d) Left-hand thumb rule

17. The device used to convert mechanical energy into electrical energy is called:

a) Electric motor

b) Electric generator

c) Transformer

d) Galvanometer

18. The magnetic field inside a long straight solenoid carrying current is:

a) Zero

b) Uniform

c) Non-uniform

d) Circular

19. The strength of the magnetic field produced by a current-carrying solenoid depends on:

a) Number of turns in the solenoid

b) Strength of the current

c) Nature of the core material

d) All of the above

20. The phenomenon of electromagnetic induction is used in:

a) Electric motor

b) Electric generator

c) Transformer

d) Both (b) and (c)

Mixed Questions

21. The power of a lens is -2.5 D. The lens is:

a) Convex lens

b) Concave lens

c) Plane lens

d) Bifocal lens

22. The resistance of a wire is \( R \). If its length is doubled and area of cross-section is halved, its new resistance will be:

a) \( R \)

b) \( 2R \)

c) \( 4R \)

d) \( R/2 \)

23. The magnetic field lines around a current-carrying straight conductor are:

a) Straight lines

b) Concentric circles

c) Elliptical

d) Parabolic

24. The far point of a hypermetropic eye is 1 m. The power of the lens required to correct this defect is:

a) +1 D

b) -1 D

c) +2 D

d) -2 D

25. The phenomenon of scattering of light is responsible for:

a) Blue color of the sky

b) Red color of the sun at sunrise and sunset

c) Both (a) and (b)

d) None of the above

26. The resistance of a conductor increases with:

a) Increase in temperature

b) Decrease in temperature

c) Increase in cross-sectional area

d) Decrease in length

27. The magnetic field inside a current-carrying solenoid can be increased by:

a) Increasing the number of turns

b) Increasing the current

c) Using a soft iron core

d) All of the above

28. The power of a lens is +4 D. Its focal length is:

a) 25 cm

b) 50 cm

c) 100 cm

d) 200 cm

29. The resistance of a wire of length \( L \) and cross-sectional area \( A \) is given by:

a) \( R = \rho \frac{L}{A} \)

b) \( R = \rho \frac{A}{L} \)

c) \( R = \frac{L}{\rho A} \)

d) \( R = \frac{A}{\rho L} \)

30. The direction of the induced current in a coil is given by:

a) Fleming's left-hand rule

b) Fleming's right-hand rule

c) Right-hand thumb rule

d) Left-hand thumb rule

Answers

1. b) Virtual and erect

2. c) 40 cm

3. b) Virtual and erect

4. a) \( 2.25 \times 10^8 \, \text{m/s} \)

5. b) 20 cm

6. a) Myopia

7. c) Dispersion

8. d) Scattering

9. a) 50 cm

10. a) -1.25 D

11. b) Ampere

12. b) Area of cross-section

13. a) \( V = IR \)

14. b) \( \frac{R_1 R_2}{R_1 + R_2} \)

15. d) All of the above

16. c) Right-hand thumb rule

17. b) Electric generator

18. b) Uniform

19. d) All of the above

20. d) Both (b) and (c)

21. b) Concave lens

22. c) \( 4R \)

23. b) Concentric circles

24. a) +1 D

25. c) Both (a) and (b)

26. a) Increase in temperature

27. d) All of the above

28. a) 25 cm

29. a) \( R = \rho \frac{L}{A} \)

30. b) Fleming's right-hand rule