Electric circuits magnetism light reflection refraction and lenses. - One Line Questions

1. What is the power of a lens with a focal length of -2 meters? — -0.5 D
2. What is the potential difference across a resistor of 10 ohms carrying a current of 2 amperes? — 20 Volts
3. What is the device used to detect the presence and direction of electric current in a circuit? — Galvanometer
4. What is the SI unit of magnetic field strength? — Tesla
5. When light travels from a rarer medium to a denser medium, it bends: — Towards the normal
6. Which type of lens is thicker at the center and thinner at the edges, and converges parallel rays of light? — Convex lens
7. What is the opposition to the flow of electric current called? — Resistance
8. The process by which a neutral object becomes electrically charged is called: — All of the above
9. The ability of a material to resist the flow of electric current is called: — Resistivity
10. In a parallel circuit, the voltage across each component is: — The same
11. A convex lens is also known as a(n): — Converging lens
12. If the resistance in a circuit is doubled, and the voltage remains constant, the current will: — Halve
13. The phenomenon of inducing an electromotive force (EMF) in a circuit due to a change in magnetic flux is called: — Electromagnetic induction
14. The force experienced by a current-carrying conductor placed in a magnetic field is given by: — F = BIL sin θ
15. What is the direction of the magnetic field lines around a bar magnet? — From North to South outside the magnet
16. A device that converts electrical energy into mechanical energy is known as: — Motor
17. Which of the following is an insulator? — Wood
18. Electromagnets are typically made using: — Soft iron
19. A device that converts electrical energy into light energy is a: — Light bulb
20. The phenomenon of light from a source spreading out after passing through a narrow slit is called: — Diffraction
21. What happens to the total resistance in a series circuit when another resistor is added? — It increases
22. The SI unit of electric power is: — Watt
23. 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? — Ohm's Law
24. The law that describes the relationship between the angle of incidence, angle of refraction, and the refractive indices of the two media is: — Snell's Law
25. Which law describes the direction of the induced current in a conductor moving in a magnetic field? — Lenz's Law
26. A device that converts mechanical energy into electrical energy using the principle of electromagnetic induction is a: — Both B and C
27. The direction of the magnetic field produced by a current-carrying solenoid is determined by: — Fleming's Right-Hand Rule
28. A circuit where the components are connected end-to-end in a single path is called a(n): — Series circuit
29. What type of mirror is used as a rearview mirror in vehicles? — Convex mirror
30. The image formed by a plane mirror is always: — Virtual and erect
31. A concave lens always forms an image that is: — Virtual, erect, and diminished
32. Which of the following is a characteristic of the image formed by a convex mirror? — Virtual, diminished, and erect
33. Which color of visible light has the shortest wavelength? — Violet
34. What is the bending of light as it passes from one medium to another called? — Refraction
35. What causes dispersion of white light into its constituent colors when it passes through a prism? — Refraction
36. The phenomenon of light scattering by particles in the atmosphere causing the blue color of the sky is an example of: — Rayleigh scattering
37. Which phenomenon is responsible for the formation of a rainbow? — Dispersion and total internal reflection
38. What is the phenomenon where light bounces off a surface? — Reflection
39. What is the phenomenon of splitting of white light into its constituent colors called? — Dispersion
40. Which of the following materials is a good conductor of electricity? — Copper
41. The SI unit of electrical resistance is: — Ohm
42. The refractive index of a medium is defined as the ratio of the speed of light in vacuum to the: — Speed of light in the medium
43. In a parallel circuit, if one branch is open, the current will: — Continue flowing in the other branches
44. The magnetic field lines around a straight current-carrying wire are: — Circular
45. Which type of magnet retains its magnetism for a long time and is difficult to demagnetize? — Permanent magnet
46. The SI unit of magnetic flux is: — Weber
47. The focal length of a lens is the distance between: — The optical center and the principal focus
48. What is the unit of electric current? — Ampere
49. What is the unit of power of a lens? — Diopter
50. What is the magnetic field inside a long, straight solenoid approximately: — Uniform
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