Basic electrical MCQ #8
1) The number of electrons in the outer most orbit of carbon atom is___________?
(a) 3
(b) 4
(c) 6
(d) 7
2) Sparking occurs when a load is switched off because the circuit has high_________?
(a) capacitance
(b) inductance
(c) resistance
(d) impedance
3) Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
(a) 40 W lamp will glow brighter
(b) 100 W lamp will glow brighter
(c) Both lamps will glow equally bright
(d) 40 W lamp will fuse
4) A glass rod when rubbed with silk cloth is charged because__________?
(a) it takes in proton
(b) it gives away electrons
(c) its atoms are removed
(d) it gives away positive charge
ANSWER: | 1-b | 2-b | 3-a | 4-b |
5) If the efficiency of a machine is to be high, what should be low __________?
(a) Input power
(b) kWh consumed
(c) True component of power
(d) Losses
6) Resistance of a material always decreases if___________?
(a) temperature of material is increased
(b) temperature of material is decreased
(c) number of free electrons available become more
(d) none of the above is correct
7) Electric current passing through the circuit produces_____________?
(a) thermal effect
(b) luminous effect
(c) magnetic effect
(d) chemical effect
8) An electric filament bulb can be worked from____________?
(a) AC supply only
(b) Battery supply only
(c) DC supply only
(d) All above
ANSWER: | 5-d | 6-c | 7-a | 8-d |
9) Which of the following quantities remain the same in all parts of a series circuit ____________?
(a) Voltage
(b) Current
(c) Power
(d) Resistance
10) A closed switch has a resistance of__________?
(a) about 500 ohms
(b) about 50 ohms
(c) zero
(d) infinity
11) If a wire conductor of 0.2-ohm resistance is doubled in length, its resistance becomes____________?
(a) 0.4 ohm
(b) 0.6 ohm
(c) 0.8 ohm
(d) 1.0 ohm
12) Insulating materials have the function of___________?
(a) preventing a short circuit between conducting wires
(b) storing very high currents
(c) conducting very large currents
(d) preventing an open circuit between the voltage source and the load
ANSWER: | 9-b | 10-c | 11-a | 12-b |
(a) 3
(b) 4
(c) 6
(d) 7
2) Sparking occurs when a load is switched off because the circuit has high_________?
(a) capacitance
(b) inductance
(c) resistance
(d) impedance
3) Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
(a) 40 W lamp will glow brighter
(b) 100 W lamp will glow brighter
(c) Both lamps will glow equally bright
(d) 40 W lamp will fuse
4) A glass rod when rubbed with silk cloth is charged because__________?
(a) it takes in proton
(b) it gives away electrons
(c) its atoms are removed
(d) it gives away positive charge
ANSWER: | 1-b | 2-b | 3-a | 4-b |
5) If the efficiency of a machine is to be high, what should be low __________?
(a) Input power
(b) kWh consumed
(c) True component of power
(d) Losses
6) Resistance of a material always decreases if___________?
(a) temperature of material is increased
(b) temperature of material is decreased
(c) number of free electrons available become more
(d) none of the above is correct
7) Electric current passing through the circuit produces_____________?
(a) thermal effect
(b) luminous effect
(c) magnetic effect
(d) chemical effect
8) An electric filament bulb can be worked from____________?
(a) AC supply only
(b) Battery supply only
(c) DC supply only
(d) All above
ANSWER: | 5-d | 6-c | 7-a | 8-d |
9) Which of the following quantities remain the same in all parts of a series circuit ____________?
(a) Voltage
(b) Current
(c) Power
(d) Resistance
10) A closed switch has a resistance of__________?
(a) about 500 ohms
(b) about 50 ohms
(c) zero
(d) infinity
11) If a wire conductor of 0.2-ohm resistance is doubled in length, its resistance becomes____________?
(a) 0.4 ohm
(b) 0.6 ohm
(c) 0.8 ohm
(d) 1.0 ohm
12) Insulating materials have the function of___________?
(a) preventing a short circuit between conducting wires
(b) storing very high currents
(c) conducting very large currents
(d) preventing an open circuit between the voltage source and the load
ANSWER: | 9-b | 10-c | 11-a | 12-b |
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