Check Your Progress
A. Multiple Choice Questions
(a) Bulb
(b) Switch
(c) Wire
(d) Electric cell
Ans: (b) Switch
2. Which of the following components is used to provide resistance?
(a) Heat
(b) Energy
(c) Product
(d) Resistor
Ans: (d) Resistor
3. Frequency (f) of alternating current is ____ hertz in India.
(a) 45
(b) 60
(c) 50
(d) 55
Ans: (c) 50
4. In a series circuit, current remains ______ and voltage is ______
(a) divided, same
(b) same, same
(c) divided, divided
(d) same, divided
Ans: (d) same, divided
5. In a parallel circuit, current remains ______ and voltage is ______
(a) divided, same
(b) same, same
(c) divided, divided
(d) same, divided
Ans: (a) divided, same
6. Amount of work in one second is known as
(a) power
(b) current
(c) voltage
(d) charge
Ans: (a) power
7. Ohm's law states that
(a) voltage is directly proportional to the applied voltage
(b) voltage is directly proportional to the applied current
(c) current is directly proportional to the applied voltage
(d) current is directly proportional to the applied current
Ans: (c) current is directly proportional to the applied voltage
8. The amount of charge flowing through a point in one second is called
(a) voltage
(b) current
(c) power
(d) charge
Ans: (b) current
9. The amount of work required to move a unit coulomb charge from point A to point B is called
(a) current
(b) charge
(c) voltage
(d) power
Ans: (c) voltage
10. What are the basic components of all matter?
(a) Electrons, neutrons, and protons
(b) Electrons, proton and ions
(c) Neutrons, protons and ions
(d) Electrons, neutrons and charged ions
Ans: (a) Electrons, neutrons, and protons
11. Electric charge can be produced by
(a) sticking
(b) rubbing
(c) oiling
(d) passing AC current
Ans: (b) rubbing
12. An electron has ______ charge.
(a) positive
(b) negative
(c) zero
(d) both (a) and (b)
Ans: (b) negative
13. A proton has ______ charge.
(a) positive
(b) negative
(c) zero
(d) both (a) and (b)
Ans: (a) positive
14. A neutron has ______ charge.
(a) positive
(b) negative
(c) zero
(d) both (a) and (b)
Ans: (c) zero
15. Unit of electric current is
(a) Ampere
(b) Volt
(c) Watt
(d) Joule
Ans: (a) Ampere
16. The unit of electrical power is
(a) Volt
(b) Watt
(c) Joule
(d) Ampere
Ans: (b) Watt
17. The term used to designate electrical pressure is
(a) Voltage
(b) Watt
(c) Joule
(d) Ampere
Ans: (a) Voltage
18. The statement which correctly represents Ohm's law is
(a) V = IR
(b) V = R / I
(c) R = VI
(d) I = R / V
Ans: (a) V = IR
19. If V = 50V and I = 5A then R =
(a) 50 Ω
(b) 5 Ω
(c) 10 Ω
(d) 2 Ω
Ans: (c) 10 Ω
20. If P = 50 watt and R = 2 Ω, then I =
(a) 50 A
(b) 5 A
(c) 10 A
(d) 5 A
Ans: (b) 5 A
21. A current of 3A flows through a conductor whose ends are at a potential difference of 6V. Calculate the resistance of the conductor.
(a) 4 Ω
(b) 5 Ω
(c) 2 Ω
(d) 2 Ω
Ans: (c) 2 Ω
22. Combination of three resistances in a series is given as
(a) R¹ + R² + R³
(b) 1/R¹ + 1/R² + 1/R³
(c) R¹ × R² × R³
(d) R¹ + R² × R³
Ans: (a) R¹ + R² + R³
23. A current of 2A flows through a 12V bulb. Calculate the resistance.
(a) 6 Ω
(b) 16 Ω
(c) 24 Ω
(d) 20 Ω
Ans: (a) 6 Ω
24. Conductors which do not obey Ohm's law are called
(a) un-ohmic conductor
(b) non-ohmic conductor
(c) low-ohmic conductor
(d) less-ohmic conductor
Ans: (b) non-ohmic conductor
25. A complete electric circuit is called
(a) open
(b) close
(c) incomplete
(d) complete
Ans: (d) complete
26. Copper wires are used as connecting wires because of
(a) low resistivity
(b) low conductivity
(c) high resistivity
(d) none of the above
Ans: (a) low resistivity
27. Electrical conductors are materials which contain
(a) only positive charge
(b) movable electric charge
(c) only negative charge
(d) None of the above
Ans: (b) movable electric charge
28. How many terminals does an electric cell consist of?
(a) One
(b) Three
(c) Two
(d) Four
Ans: (c) Two
29. Electric cell converts _____ energy into _____ energy.
(a) electrical, mechanical
(b) mechanical, electrical
(c) chemical, electrical
(d) electrical, chemical
Ans: (c) chemical, electrical
30. Battery is used in the circuit to
(a) measure current
(b) maintain potential difference
(c) oppose the current
(d) measure potential
Ans: (b) maintain potential difference
B. Fill in the Blanks
1. In _____ circuit, current remains same and voltage divides.
Ans: series
2. In _____ circuit, current divides and voltage remains same.
Ans: parallel
3. Amount of _____ in one second is known as _____
Ans: work, power
4. A component which is used to close or break a circuit is _____
Ans: switch
5. Proton has _____ charge.
Ans: positive
6. Unit of electrical _____ is watt.
Ans: power
7. Current is directly proportional to the applied voltage is a law given by _____
Ans: Ohm
8. 1 kWh = _____ watt x second
Ans: 3,600,000
9. Switch is used for _____ and _____ of circuit.
Ans: opening, closing
10. Electrons have _____ charge.
Ans: negative
C. State whether True or False
1. Frequency (f) of alternating current is 60 hertz in India.
Ans: False
2. Electrons are electrically neutral.
Ans: False
3. Due to rubbing of two bodies, electric charge is produced.
Ans: True
4. Kirchhoff's law states the relation between voltage, current and resistances.
Ans: True
5. Unit of current is ampere.
Ans: True
6. A resistor easily passes current.
Ans: False
7. Unit of voltage is watt.
Ans: False
8. Unit of power is joule/second.
Ans: True
9. Current in a circuit is instantly established.
Ans: True
10. 1kWh = 1000 watt x 3600 seconds.
Ans: True
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