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Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 18 (60 MCQs)

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1. In a simple circuit, what happens to the current if the resistance increases while the voltage remains constant?
2. What is the relationship between charge, current, and time?
3. Which of the following has negative temperature coefficient of resistance
4. What metal is the best conductor of electrical current?
5. A point charge of +3.0 X 10$^{-7}$ coulomb is placed 2.0 X 10$^{-2}$ meter from a second point charge of +4.0 X 10$^{-7}$ coulomb. What is the magnitude of the electrostatic force on the charges?
6. True or False:In static electricity, charges build up on an object, but they do not flow continuously.
7. Why are humans conductors?
8. Ohm's law is true for
9. The gold color band refers to ..... tolerance.
10. SI unit of voltage is
11. What is an electric cell?
12. An electrical component that we use in electronics circuits to limit current though an active component or to reduce voltage in the circuit.
13. The internal resistance of a 2.1 V cellwhich gives a current of 0.2 A througha resistance of 10 $\Omega$ is
14. A charge of 500 C flows through a bulb for 5 min, then the amount of current flowing through the circuit is
15. A car is moving on a banked track of radius 10m with a constant speed of 10 m/s. The angle of banking is ..... (g = 10 m/s$^{2}$)
16. A way to protect a circuit from dangerous high currents-the strip melts creating an open circuit
17. Current electricity is a form of energy when the charges are the rest.
18. This type of electricity is known as static electricity.
19. To protect wiring from excessive passing of current is
20. Metals are good conductors of electricity.
21. What is static electricity?
22. The graph between resistivity and temperature, for a limited range of temperatures, is a straight line for a material like
23. Nichrome wire is used as the heating element beacause it has
24. A current 1.5 A is drawn by an electric bulb for 10 min, then the amount of electric charge is
25. How does temperature affect the resistivity of conductors?
26. Why copper is a good conductor of electricity?
27. Connects objects to cells separately so there are 2 paths for electricity to flow
28. Which component would you use to indicate that a current may be flowing?
29. Objects that allow thermal and electrical energy to pass through easily.
30. If you take one light bulb out of a parallel circuit, all the lights will go out.
31. Isha was doing an experiment to see how electricity behaves in a magnetic field. She sets up the north pole of one magnet on the right and the south pole of another on the left. This made the magnetic field lines point .....
32. Describe a series circuit.
33. In Physics, an ideal ammeter has .....
34. Which of the following materials is commonly used to make the core of an electromagnet?
35. Plugging too many devices into one circuit can cause too much ..... to go through a .....
36. The type of circuit that requires a circuit breaker and why
37. Two wires of same metal have the same length but their cross-sections are in the ratio 3:1. They are joined in series. The resistance of the thicker wire is 10$\Omega$. The total resistance of the combination in $\Omega$ is:
38. An electrical junction has four wires A, B, C and D connected to it. Wire A carries 7A going in, wire B carries 5 A going out and wire C carries 2 A going in. What does wire D carry?
39. In a circuit the energy flows from which terminal to the rest of the component?
40. What is the formula for calculating the total resistance of resistors in series?
41. The sensitivity of potentiometer can be increased by
42. Common forms include lightning or a shock when you touch a doorknob
43. What are the two types of currents?
44. If one burned out bulb causes all of the lights to fail in a circuit, what might you conclude?
45. If V is the potential difference across the ends of a resistor and I is the current flowing through the resistor, state the formula that can be used to determine the resistance R.
46. To convert a moving coil galvanometer into a voltmeter ..... is connected.
47. The potential difference between the terminals of a 12.0 V battery is 11 V when it is connected with another resistance of 11 $\Omega$ in series. What is the internal resistance of the battery? (Hint-Use Terminal Potential = EMF-Current*Internal Resistance)
48. The voltage difference between the live and neutral wires is about .....
49. The tendency for a material to oppose the flow of electrons$_{}$
50. The potential difference between the terminals of a battery is 10V and internal resistance 1 $\Omega$
51. Which of the following belong to AC current in India?
52. Superposition theorem states that the response in any element is the ..... of the responses that can be expected to flow if each source acts independently of other sources.
53. What is the magnitude of current in our nervous system?
54. Positive Thomson effect is observed in
55. A certain wire has resistance R. Another wire, of the same material, has half the length and half the diameter of the first wire. The resistance of the second wire is:
56. In, current flows more easily because electrons are more loosely bound to
57. Electric force is a type of
58. If 5J of work is required to shift 10 C charge from one place to another place then potential energy difference is
59. The stronger the current, the ..... the bulb.
60. A thicker wire offers
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