1. . The resistance of a conductor is calculated by:
(A) ๐น = ๐๐ฅ / ๐
(B) ๐ = ๐ / ๐
(C) ๐ = ๐๐ฅ / ๐
(D) ๐ = ๐ฅ / ๐
2. . The law of resistance is defined as:
(A) ๐ = ๐๐ฅ / ๐
(B) ๐ = ๐ / ๐
(C) ๐ = ๐๐ฅ / ๐
(D) ๐ = ๐ฅ / ๐
3. . The resistance of the material depends on:
(A) Temperature
(B) length of conductor
(C) Area of cross-section
(D) All the above
4. . The resistivity of a wire depends on:
(A) Length
(B) material
(C) cross section area
(D) none of the above
5. . The SI unit of electrical resistance is:
(A) Ampere
(B) Volt
(C) Ohm
(D) Watt
6. . The inverse quantity of resistance is called:
(A) Voltage
(B) Power
(C) Impedance
(D) Conductance
7. . If resistance decreases, then current will:
(A) Decrease
(B) increase
(C) Remain the same
(D) double
8. . Current in series circuit will:
(A) Different
(B) same
(C) zero
(D) high
9. . Voltage in parallel circuit will:
(A) Different
(B) same
(C) zero
(D) high
10. . In parallel circuits:
(A) I = I1 = I2 = I3 โฆ = In
(B) I = I1 โ I2 โ I3 โฆ โ In
(C) I = I1 + I2 + I3 โฆ + In
(D) All of these
11. . In which circuit, the total resistance is greater than the largest resistance in the circuit:
(A) Series
(B) Parallel
(C) Either series or parallel
(D) neither series nor parallel
12. . Two resistors of 4 and 6 ohms are connected in series, the total resistance is:
(A) 10 ohms
(B) 6 ohms
(C) 4 ohms
(D) 24 ohms
13. . When some different valued resistance are connected in series, the voltage drop across each of the resistors is:
(A) Proportional to resistance
(B) Proportional to current
(C) Proportional to the square of the current
(D) Equal
14. . In which circuit, the total resistance is smaller than the smallest resistance in the circuit:
(A) Series
(B) Parallel
(C) Either series or parallel
(D) neither series nor parallel
15. . Two resistances R1 and R2 are connected in parallel, the formula for the total resistance is:
(A) RT = (R1 + R2) รท (R1R2)
(B) RT = (R1R2) รท (R1 + R2)
(C) RT = R1 + R2
(D) RT = R1R2
16. . The rated current for a 100W, 220V lamp is:
(A) 0.225 Ampere
(B) 0.454 Ampere
(C) 0.954 Ampere
(D) 0.754 Ampere
17. . Two lamps of the same rating connected in series will give light:
(A) High
(B) dim
(C) no light
(D) one high and one dim
18. . Two lamps of the same rating connected in parallel will give light:
(A) No light
(B) dim
(C) same
(D) one high and one dim
19. . Which of the following is not an expression of power:
(A) P = VI
(B) P = IยฒR
(C) P = Vยฒ / R
(D) P = I / R
20. . A 250V bulb passes a current of 0.3A. Calculate the power in the lamp:
(A) 75 W
(B) 50 W
(C) 25 W
(D) 90 W