TNTET Paper 2 - Electric circuits magnetism light reflection refraction and lenses. Online Test (MCQ Quiz)

1. What is the unit of electric current?

A) Volt B) Ohm C) Ampere D) Watt

2. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them?

A) Joule's Law B) Faraday's Law C) Ohm's Law D) Ampere's Law

3. What is the opposition to the flow of electric current called?

A) Conductance B) Resistance C) Capacitance D) Inductance

4. A device that converts electrical energy into mechanical energy is known as:

A) Generator B) Motor C) Transformer D) Resistor

5. What is the SI unit of magnetic field strength?

A) Ampere per meter B) Tesla C) Gauss D) Weber

6. The phenomenon of inducing an electromotive force (EMF) in a circuit due to a change in magnetic flux is called:

A) Electromagnetic induction B) Electrostatic induction C) Magnetic resonance D) Magnetic saturation

7. Which type of magnet retains its magnetism for a long time and is difficult to demagnetize?

A) Temporary magnet B) Electromagnet C) Permanent magnet D) Induced magnet

8. What is the bending of light as it passes from one medium to another called?

A) Reflection B) Diffraction C) Refraction D) Dispersion

9. The law that describes the relationship between the angle of incidence, angle of refraction, and the refractive indices of the two media is:

A) Law of Reflection B) Snell's Law C) Huygens' Principle D) Doppler Effect

10. What is the phenomenon where light bounces off a surface?

A) Refraction B) Diffraction C) Reflection D) Interference

11. Which type of lens is thicker at the center and thinner at the edges, and converges parallel rays of light?

A) Concave lens B) Convex lens C) Plano-concave lens D) Plano-convex lens

12. A concave lens always forms an image that is:

A) Real, inverted, and magnified B) Virtual, erect, and diminished C) Real, erect, and diminished D) Virtual, inverted, and magnified

13. The focal length of a lens is the distance between:

A) The optical center and the pole B) The optical center and the principal focus C) The pole and the principal focus D) The center of curvature and the pole

14. What causes dispersion of white light into its constituent colors when it passes through a prism?

A) Reflection B) Refraction C) Diffraction D) Polarization

15. Which color of visible light has the shortest wavelength?

A) Red B) Violet C) Green D) Blue

16. The SI unit of electrical resistance is:

A) Siemens B) Farad C) Henry D) Ohm

17. A circuit where the components are connected end-to-end in a single path is called a(n):

A) Parallel circuit B) Series circuit C) Combination circuit D) Open circuit

18. What happens to the total resistance in a series circuit when another resistor is added?

A) It decreases B) It increases C) It remains the same D) It becomes zero

19. In a parallel circuit, the voltage across each component is:

A) Different B) The same C) Zero D) Variable

20. The magnetic field lines around a straight current-carrying wire are:

A) Straight lines B) Circular C) Elliptical D) Spiral

21. A device that converts mechanical energy into electrical energy using the principle of electromagnetic induction is a:

A) Motor B) Generator C) Dynamo D) Both B and C

22. The direction of the magnetic field produced by a current-carrying solenoid is determined by:

A) Ohm's Law B) Fleming's Right-Hand Rule C) Coulomb's Law D) Snell's Law

23. What is the phenomenon of splitting of white light into its constituent colors called?

A) Refraction B) Reflection C) Dispersion D) Diffraction

24. The image formed by a plane mirror is always:

A) Real and inverted B) Virtual and erect C) Real and erect D) Virtual and inverted

25. Which of the following is a characteristic of the image formed by a convex mirror?

A) Real, magnified, and inverted B) Virtual, diminished, and erect C) Real, diminished, and erect D) Virtual, magnified, and inverted

26. The refractive index of a medium is defined as the ratio of the speed of light in vacuum to the:

A) Speed of light in the medium B) Speed of sound in the medium C) Speed of light in air D) Speed of light in glass

27. What is the power of a lens with a focal length of -2 meters?

A) 0.5 D B) -0.5 D C) 2 D D) -2 D

28. Which of the following materials is a good conductor of electricity?

A) Rubber B) Glass C) Copper D) Plastic

29. What is the potential difference across a resistor of 10 ohms carrying a current of 2 amperes?

A) 5 Volts B) 20 Volts C) 0.5 Volts D) 12 Volts

30. The SI unit of magnetic flux is:

A) Tesla B) Weber C) Gauss D) Ampere

31. Which law describes the direction of the induced current in a conductor moving in a magnetic field?

A) Lenz's Law B) Faraday's Law C) Ampere's Law D) Biot-Savart Law

32. Electromagnets are typically made using:

A) Hard iron B) Soft iron C) Steel D) Aluminum

33. The phenomenon of light scattering by particles in the atmosphere causing the blue color of the sky is an example of:

A) Reflection B) Refraction C) Dispersion D) Rayleigh scattering

34. A convex lens is also known as a(n):

A) Diverging lens B) Converging lens C) Spherical lens D) Cylindrical lens

35. When light travels from a rarer medium to a denser medium, it bends:

A) Away from the normal B) Towards the normal C) Parallel to the normal D) Does not bend

36. What is the unit of power of a lens?

A) Watt B) Joule C) Diopter D) Ohm

37. Which of the following is an insulator?

A) Gold B) Silver C) Wood D) Copper

38. If the resistance in a circuit is doubled, and the voltage remains constant, the current will:

A) Double B) Halve C) Remain the same D) Become zero

39. What is the magnetic field inside a long, straight solenoid approximately:

A) Zero B) Uniform C) Variable D) Zero at the center and increases outwards

40. The force experienced by a current-carrying conductor placed in a magnetic field is given by:

A) F = BIL sin θ B) F = qvB C) V = IR D) E = mc²

41. What is the device used to detect the presence and direction of electric current in a circuit?

A) Ammeter B) Voltmeter C) Galvanometer D) Ohmmeter

42. The phenomenon of light from a source spreading out after passing through a narrow slit is called:

A) Interference B) Diffraction C) Polarization D) Refraction

43. What type of mirror is used as a rearview mirror in vehicles?

A) Plane mirror B) Concave mirror C) Convex mirror D) Parabolic mirror

44. The ability of a material to resist the flow of electric current is called:

A) Conductivity B) Resistivity C) Permittivity D) Permeability

45. The SI unit of electric power is:

A) Joule B) Watt C) Volt D) Ampere

46. What is the direction of the magnetic field lines around a bar magnet?

A) From South to North outside the magnet B) From North to South outside the magnet C) They do not form closed loops D) They start from the center and go outwards

47. The process by which a neutral object becomes electrically charged is called:

A) Conduction B) Induction C) Friction D) All of the above

48. Which phenomenon is responsible for the formation of a rainbow?

A) Reflection only B) Refraction only C) Dispersion and total internal reflection D) Diffraction

49. A device that converts electrical energy into light energy is a:

A) Heater B) Motor C) Light bulb D) Speaker

50. In a parallel circuit, if one branch is open, the current will:

A) Stop flowing in all branches B) Continue flowing in the other branches C) Increase in the other branches D) Decrease in the other branches

Electric circuits magnetism light reflection refraction and lenses. - Online Test

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