1. The SI unit of electrical resistance is:
2. According to Ohm’s law, the current flowing through a conductor is directly proportional to the:
3. What is the total resistance when three resistors of 2 Ω, 3 Ω and 5 Ω are connected in series?
4. Which of the following materials is most likely a good electrical conductor?
5. If a 60 W bulb is switched ON for 2 hours, the energy consumed is:
6. When resistors are connected in parallel, the equivalent resistance is always:
7. The colour bands on a resistor indicate its:
8. A short circuit in an electrical circuit is dangerous because:
9. Which device is commonly used to protect household circuits from excessive current?
10. In which of the following combinations of materials will they conduct electricity (at room temperature)?
11. In air, violet light bends _________ when passing into glass compared to red light.
12. The phenomenon due to which white light splits into its constituent colours when passing through a prism is called:
13. When you look at yourself in a plane mirror, the image appears:
14. The laws governing reflection of light from a plane mirror are:
15. What is the speed of light in vacuum?
16. What happens to the refracted light when it goes from air into water?
17. The phenomenon that keeps a diamond shiny even when it is immersed in water is:
18. The refractive index of a medium is defined as the ratio of:
19. The splitting of white light into colours by water droplets causing a rainbow is due to:
20. Why does a stick partially immersed appear bent at the water surface?
21. Sound travels fastest in which of the following media?
22. The human ear can hear frequencies in the range of approximately:
23. Which of the following phenomena causes echo?
24. Which property of sound determines its loudness?
25. When the source of sound approaches a listener, the apparent frequency heard by the listener:
26. Which colour of light undergoes the least deviation when passing through a prism?
27. The image formed by a plane mirror is always at a distance from the mirror equal to:
28. What is the phenomenon responsible for the “twinkling” of stars?
29. Why do distant mountains appear bluish?
30. Which phenomenon is used in optical fibres to transmit light over long distances?
31. Electrical devices in our homes are connected in:
32. Which of the following is not a cause of scattering of light in the atmosphere?
33. When a sound wave travels from air into water, which of the following changes?
34. Which property of a medium affects the speed of sound in it?
35. For safe electrical wiring, the insulation used should be:
36. If the current through a conductor doubles, and its resistance remains the same, then the power dissipated will:
37. Which of the following correctly states the relationship between the speed v of light in vacuum, its wavelength λ, and frequency f?
38. The characteristic of a sound wave which determines its pitch is its:
39. In which of the following cases no refraction of light will occur when light travels from medium 1 to medium 2?
40. Which among the following is not a transverse wave?
41. A resistor of 10 Ω carries a current of 2 A. The power dissipated will be:
42. Which part of the human ear receives the vibrations from eardrum and transmits to the inner ear?
43. If 2 identical bulbs each of 100 W are connected in series to a 220 V supply, the power consumed by each bulb will be:
44. The ratio of speed of light in vacuum to speed in glass is called:
45. What phenomenon causes red sunrise and sunset?
46. In which medium does sound travel slowest?
47. The amplitude of a wave is related to its _________.
48. If you double the voltage across a fixed resistor (keeping resistance constant), the current through it will:
49. A wave that does not require a medium to travel is:
50. Which of the following is not a form of electromagnetic radiation?