Physics
Ss1
1. The SI unit of electric current is (a) ampere (b) volts (c) ohms (d) coulomb
2. The SI unit of electric charge is (a) ampere (b) volts (c) ohms (d) coulomb
3. The SI unit of potential difference is (a) ampere (b) volts (c) ohms (d) coulomb
4. The SI unit of resistance is (a) ampere (b) volts (c) ohms (d) coulomb
5. Ohms law states that (a) V=IR (b) Q=It (c) R=IV (d) W=QV
6. If four identical cells each 2volts are connected in series, the equivalent pd is (a) 2v (b) 4v (c) 6v
(d) 8v
7. If four identical cells each 2volts are connected in parallel, the equivalent pd is (a) 2v (b) 4v (c) 6v
(d) 8v
8. If 2Ω, 2Ω, and 1Ω resistors are connected in series the equivalent resistance (a) 5 Ω (b) ½ Ω (c) 4 Ω (d)
2Ω
9. If 2Ω, 2Ω, and 1Ω resistors are connected in parallel the equivalent resistance (a) 5 Ω (b) ½ Ω (c) 4 Ω
(d) 2 Ω
10.Two resistors of resistance 1 Ω are connected in parallel to a 2 Ω resistor, the equivalent resistance is
…….. (a) 4 Ω (b) 3 Ω (c) 2 Ω (d) 1 Ω
11. Electrical energy is measured in (a) watt (b) kilowatt-hour
(c) kilowatt (d) none of the above
12. If a p.d of 240v is applied across a lamp that supplies energy at the rate of 60w
What is the value of current? (a) 0.2A (b)0.25A (c) 0.3A (d) 3A
13. The resistance of the filament in question 2 is ______ (a) 96Ω (b) 48Ω
(c) 960Ω (d) 900Ω
14. Calculate the conductance of a conductor having a resistance of 10Ω
(a) 0.1 (b) 1 (c) 10Ω (d) 0.01Ω
15. The SI unit of resistivity is ____ (a) Ω/M (b)Ω2/M (c) ΩM
(d) none of the above.
16. Fuse is a protective device, design to .. (a) stick (b) melt (c) disappear (d) repel
17. The conductor designed to melt is called . (a) fuse element (b) fuse (c) resistor (d) cartridge fuse
18. The following are examples of fuse except . fuse (a) re-wire able (b) merger (c) cartridge (d) high
breaking capacity
19. Which of the following correctly gives the relationship between linear speed v & angular velocity w
of a body moving uniformly (a) v=w r (b) v=w2r (c) v=wr2 (d) v=w/r
20. The motion of the prongs of a sounding turning fork is (a) random (b) translational (c) rotational (d)
vibratory
1. Define the following terms (a) Electric current (b) Potential difference (c) Internal resistance
2. Describe an experiment to verify ohms law
if 2Ω, 3Ω, and 5Ω resistors are connected in (a) series (b) parallel, calculate the equivalent resistance
(a) RT = 2+3+5 = 10Ω
Define the following terms (a) fuse (b) fuse element (c) current rating of a fuse
Mention four ways of detecting fault in an electric circuit
