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Physics 10 Chapter 14 - Current and Electricity - 27
1.
What is true about conductivity of earth?
a) Earth is a fairly good heat conductor
b) Earth is a fairly good electrical conductor
c) Earth is a bad conductor
d) Earth is a bad electrical conductor
2.
What is the method called in which the charge is transferred from the charged body towards the earth by a piece of metal?
a) Conducting
b) Insulating
c) Grounding
d) Batten wiring
3.
What is the round post in the familiar three-prong electric plug in the house connections?
a) Neutral wire
b) Negative wire
c) Live wire
d) Ground connection
4.
What is the amount of energy supplied by current in unit time called?
a) Electric current
b) Resistance
c) Kilowatt-hour
d) Electric power
5.
What is meant by power?
a) Energy supplied by current in unit time
b) Energy supplied by charge in unit time
c) Energy supplied by coulomb's force in unit time
d) Energy supplied by resistance in unit time
6.
What is the formula of electric power?
a) Electric power = Electrical energy x Time
b) Electric power = (Electrical energy)
2
/ Time
c) Electric power = Time / Electrical energy
d) Electric power = Electrical energy / Time
7.
What is the formula of electric power?
a) Electric power = t / I
b) Electric power = I / t
c) Electric power = W / t
d) Electric power = t / W
8.
Which of the following formula is true about electric power?
a) P = I / V
b) P = R x V
c) P = V x I
d) P = I x V
9.
If current I = 10 A and potential difference V = 50 V. Then find the power P?
a) P = 1/5 W
b) P = 500 W
c) P = 5 W
d) P = 60 W
10.
What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A?
a) 14.5 W
b) 30 W
c) 4.8 W
d) 60 W
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