2. 1. Electric current originates from which part of an atom?
a. Nucleus
b. Entire atom acting as a unit
c. Positively charged protons
d. Negatively charged electrons
3. 2. When a person combs her hair, static electricity is
sometimes generated by what process?
a. Friction between the comb and hair transfers electrons.
b. Induction between the comb and hair.
c. Deduction between the comb and hair.
d. Contact between the comb and hair results in a charge.
4. 3. Which of the following is a pentavalent impurity?
a. Boron
b. Phosphorus
c. Aluminium
d. Indium
5. 4. A hole in a semiconductor is defined as:
a. A free electron
b. A free proton
c. The incomplete part of a electron bond pair
d. None of the above
6. 5. If the number of valence electrons in an atom is less than 4, what is
the substance called?
a. Conductor
b. Insulator
c. Neutral
d. Semiconductor
7. 6. Which of the following is NOT a true difference between EMF and
Potential Difference (PD)?
a. EMF refers to the source of electrical energy, while PD exists
between any points in a circuit.
b. EMF is measured in an open circuit whereas PD is measured in a
closed circuit.
c. PD is a cause of current flow, while EMF is the effect.
d. PD is always less than EMF.
8. 7. Two electric field lines due to a point charge
a. Never intersect
b. May intersect near the charge
c. Always intersect
d. None of the above
9. 8. If the direction of two electric field lines due to two unlike point
charges is from left to right, then
a. Positive charge is at left and negative charge is at right
b. Positive charge is at right and negative charge is at left
c. Both charges are at left
d. Both charges are at right
10. 9. Expanding and Cooling of hot air results in
a. Condensation
b. Vapourisation
c. Hail Storm
d. None of the above
11. 10. “A good absorber of heat is a good emitter of heat also” is
a. Stefan’s law
b. Plank’s law
c. Kirchoff’s law
d. Biot-Savart law
12. 11. The heat transfer in a light bulb takes place due to:
a. Conduction
b. Convection
c. Radiation
d. Both option 2 and 3 are correct
13. 12. What is the international color code of active, neutral and earthed
wires?
a. Red is active, black is neutral and yellow/green is earth.
b. Red is active, yellow/green is neutral and black is earth.
c. Black is active, red is neutral and yellow/green is earth.
d. Black is active, yellow/green is neutral and red is earth.
14. 13. The unit of capacitance is
a. Farad
b. Volt
c. Ampere
d. None of the above.
15. 14. The minimum number of diodes required in the full wave rectifier
is
a. 3
b. 1
c. 4
d. 2
16. 15. The DC output voltage of a full-wave rectifier is ______ the DC
output voltage of a half-wave rectifier.
a. Double
b. Half
c. Equal
d. Not related
17. 16. A step-up transformer converts _____ into ______.
a. Low voltage at low current, high voltage at high current
b. High voltage at low current, low voltage at high current
c. High voltage at high current, low voltage at low current
d. Low voltage at high current, high voltage at low current
18. 17. A single winding transformer is called:
a. A power transformer
b. An autotransformer
c. A distribution transformer
d. A welding transformer
19. 18. From the V-I graph given for three resistors R1, R2 and R3, it may
be concluded that:
a. R1>R2>R3
b. R3>R2>R1
c. R1=R2=R3
d. More than one of the above
20. 19. Two resistors one of 8 Ω and one of 24 Ω are connected in
parallel. This combination is connected in series with a 14 Ω
resistor and a 12V battery. The current in the 8 Ω resistor is
a. 0.45 A
b. 0.30 A
c. 0.15 A
d. None of the above
21. 20. The amplification produced by a triode is due to the action of
a. Filament
b. Cathode
c. Grid
d. plate
