1. Two wires A and B of the same material and length l and 2l have radius r and 2r respectively. The ratio of their resistance will be
a) 1:1
b) 1:2
c) 1:4
d) 1:8
ans: a
2. Pure metals generally have
a) high conductivity and low temperature coefficient
b) high conductivity and large temperature coefficient
c) low conductivity and zero temperature coefficient
d) low conductivity and high temperature coefficient
ans: b
3. The temperature coefficient of resistance of a wire is 0.0008'C. If the resistance of the wire is 8 Ohm at 0'C , what is the resistance of the wire at 100'C?
a) 8.64 Ohm
b) 8.08 Ohm
c) 7.92 Ohm
d) 7.20 Ohm
ans: a
4. The insulation resistance of a cable of length is 1 MegaOhm.For a length of 100 km of same cable, the insulation resistance will be
a) 1 MegaOhm
b) 10 MegaOhm
c) 0.1 MegaOhm
d) 0.01 MegaOhm
ans: c
5. The hot resistance of the filament of a bulb is higher than the cold resistance because the temperature coefficient of the filament is
a) negative
b) infinite
c) zero
d) positive
ans: d
6. Four resistances 80 Ohm, 50 Ohm , 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4 A.Total current of the supply is 10 A. The value of R will be
a) 66.66 Ohm
b) 40.25 Ohm
c) 36.36 Ohm
d) 76.56 Ohm
ans: c
7. Three parallel resistive branches are connected across a DC supply .What will be the ratio of the branch currents I1:I2:I3 if the branch resistances are in the ratio R1:R2:R3::2:4:6 ?
a) 3:2:6
b) 2:4:6
c) 6:3:2
d) 6:2:4
ans: c.
8. Two resistors R1and R2 give combined resistance of 4.5 Ohm when in series and 1 Ohm when in parallel , the resistances are
a) 2 ohm and 2.5 ohm
b) 1 ohm and 3.5 ohm
c) 1.5 ohm and 3 ohm
d) 4 and 0.5 ohm
ans: c
9. How are 500 Ohm resistors connected so as to give an effective resistance of 750 Ohm?
a) Three resistors of 500 Ohm each , in parallel
b) Three resistors of 500 Ohm each , in series
c) Two resistors of 500 Ohm each , in parallel
d) Two resistors of 500 Ohm, each , in parallel and the combination in series with another 500 Ohm resistor.
ans: d
10. Which of the following does not use heating effect of electric current?
a) Electric furnace
b) Geyser
c) Electric Iron
d) Vacuum Cleaner
ans: d
11. Which of the following is not equivalent to Watts?
a) amperes X volts
b) amperes X amperes X volt
c) amperes/ volt
d) joules per second
ans: c
12. A network consists of linear resistors and ideal voltage source. If the value of the resistors are doubled , then voltage across each resistor is
a) halved
b) doubled
c) increased four tines
d) not changed
ans: d
13. Three resistances each of R Ohm are connected to form a triangle. The resistance between any two terminals will be
a) R ohm
b) 3/2 ohm
c) 3R ohm
d) 2/3 ohm
ans: d
14. When an electric current flows through a conductor, its temperature rises. This is because of
a) mutual collisions between metal atoms
b) mutual collisions between conducting electrons
c) collisions between conduction electrons and atoms
d) none of the above
ans: c
15. Two heaters , rated at 1000 W , each 250 V are connected in series across a 250 V , 50 Hz AC mains. The total power drawn from the supply would be
a) 1000 W
b) 500 W
c) 250 W
d) 2000 W
ans: b
16. Two incandescent light bulbs of 40 W and 60 W rating are connected in series across the mains. Then
a) the bulbs together consume 100 W
b) the bulbs together consume 50 W
c) the 60 W bulb glows brighter
d) the 40 W bulb glows brighter
ans : d
17. How many 200 W/ 220 V incandescent lamps connected in series would consume the same total power as a single 100W/ 220V incandescent lamp?
a) not possible
b) 2
c) 3
d) 4
ans: b
18. A 100W bulb burns on an average of 10 hours a day for one week. The weekly consumption of energy will be
a) 7
b) 70
c) 0.7
d) none of the above
ans: a
19. A network has 4 nodes and 3 independent loops. What is the number of branches in the network?
a) 5
b) 6
c) 7
d) none of the above
ans: b
20. An electric circuit with 10 nodes and 7 branches will have
a) 3 loop equations
b) 4 loop equations
c) 7 loop equations
d) none of the above
ans: b
21. A network has 10 nodes and 17 branches. . The number of different node pair voltage would be
a) 7
b) 9
c) 45
d) none of the above
ans: b
a) 1:1
b) 1:2
c) 1:4
d) 1:8
ans: a
2. Pure metals generally have
a) high conductivity and low temperature coefficient
b) high conductivity and large temperature coefficient
c) low conductivity and zero temperature coefficient
d) low conductivity and high temperature coefficient
ans: b
3. The temperature coefficient of resistance of a wire is 0.0008'C. If the resistance of the wire is 8 Ohm at 0'C , what is the resistance of the wire at 100'C?
a) 8.64 Ohm
b) 8.08 Ohm
c) 7.92 Ohm
d) 7.20 Ohm
ans: a
4. The insulation resistance of a cable of length is 1 MegaOhm.For a length of 100 km of same cable, the insulation resistance will be
a) 1 MegaOhm
b) 10 MegaOhm
c) 0.1 MegaOhm
d) 0.01 MegaOhm
ans: c
5. The hot resistance of the filament of a bulb is higher than the cold resistance because the temperature coefficient of the filament is
a) negative
b) infinite
c) zero
d) positive
ans: d
6. Four resistances 80 Ohm, 50 Ohm , 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4 A.Total current of the supply is 10 A. The value of R will be
a) 66.66 Ohm
b) 40.25 Ohm
c) 36.36 Ohm
d) 76.56 Ohm
ans: c
7. Three parallel resistive branches are connected across a DC supply .What will be the ratio of the branch currents I1:I2:I3 if the branch resistances are in the ratio R1:R2:R3::2:4:6 ?
a) 3:2:6
b) 2:4:6
c) 6:3:2
d) 6:2:4
ans: c.
8. Two resistors R1and R2 give combined resistance of 4.5 Ohm when in series and 1 Ohm when in parallel , the resistances are
a) 2 ohm and 2.5 ohm
b) 1 ohm and 3.5 ohm
c) 1.5 ohm and 3 ohm
d) 4 and 0.5 ohm
ans: c
9. How are 500 Ohm resistors connected so as to give an effective resistance of 750 Ohm?
a) Three resistors of 500 Ohm each , in parallel
b) Three resistors of 500 Ohm each , in series
c) Two resistors of 500 Ohm each , in parallel
d) Two resistors of 500 Ohm, each , in parallel and the combination in series with another 500 Ohm resistor.
ans: d
10. Which of the following does not use heating effect of electric current?
a) Electric furnace
b) Geyser
c) Electric Iron
d) Vacuum Cleaner
ans: d
11. Which of the following is not equivalent to Watts?
a) amperes X volts
b) amperes X amperes X volt
c) amperes/ volt
d) joules per second
ans: c
12. A network consists of linear resistors and ideal voltage source. If the value of the resistors are doubled , then voltage across each resistor is
a) halved
b) doubled
c) increased four tines
d) not changed
ans: d
13. Three resistances each of R Ohm are connected to form a triangle. The resistance between any two terminals will be
a) R ohm
b) 3/2 ohm
c) 3R ohm
d) 2/3 ohm
ans: d
14. When an electric current flows through a conductor, its temperature rises. This is because of
a) mutual collisions between metal atoms
b) mutual collisions between conducting electrons
c) collisions between conduction electrons and atoms
d) none of the above
ans: c
15. Two heaters , rated at 1000 W , each 250 V are connected in series across a 250 V , 50 Hz AC mains. The total power drawn from the supply would be
a) 1000 W
b) 500 W
c) 250 W
d) 2000 W
ans: b
16. Two incandescent light bulbs of 40 W and 60 W rating are connected in series across the mains. Then
a) the bulbs together consume 100 W
b) the bulbs together consume 50 W
c) the 60 W bulb glows brighter
d) the 40 W bulb glows brighter
ans : d
17. How many 200 W/ 220 V incandescent lamps connected in series would consume the same total power as a single 100W/ 220V incandescent lamp?
a) not possible
b) 2
c) 3
d) 4
ans: b
18. A 100W bulb burns on an average of 10 hours a day for one week. The weekly consumption of energy will be
a) 7
b) 70
c) 0.7
d) none of the above
ans: a
19. A network has 4 nodes and 3 independent loops. What is the number of branches in the network?
a) 5
b) 6
c) 7
d) none of the above
ans: b
20. An electric circuit with 10 nodes and 7 branches will have
a) 3 loop equations
b) 4 loop equations
c) 7 loop equations
d) none of the above
ans: b
21. A network has 10 nodes and 17 branches. . The number of different node pair voltage would be
a) 7
b) 9
c) 45
d) none of the above
ans: b
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ReplyDelete7. Three parallel resistive branches are connected across a DC supply .What will be the ratio of the branch currents I1:I2:I3 if the branch resistances are in the ratio R1:R2:R3::2:4:6 ?
a) 3:2:6
b) 2:4:6
c) 6:3:2
d) 6:2:4
ans: c.
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thanq sir.
Plzz explain the answers sir am Swathi.
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