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Published on: 29/08/2019
Electricity
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Questions + Answers key
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1.
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly
1020
1016
1018
1023
2.
Electrical resistivity of a given metallic wire depends upon
its length
its thickness
its shape
nature of the material
3.
The commonly used safety fuse wire is made of
Lead
Copper
Nickel
An alloy of tin and lead
4.
1 kilowatt hour (kWh) is equal to
3.6 \(\times\)106J
3.6 \(\times\)108J
3.6 \(\times\)102J
3.6 \(\times\)105J
5.
The unit of specific resistance is
Ohm per meter
Ohm
Ohm per second
Ohm meter
6.
How is ammeter and voltmeter connected in a circuit?
7.
Give the S.I. unit of electric current?
8.
What is an ammeter?
9.
Why is the series arrangement not used for connecting domestic electric appliances in a circuit?
10.
What is meant by the statement, "Potential difference between points A and B in an electric field is 1 volt"?
1.
(a)
1020
2.
(d)
nature of the material
3.
(a)
Lead
4.
(d)
3.6 \(\times\)105J
5.
(d)
Ohm meter
6.
Ammeter is connected in series and voltmeter is connected in parallel.
7.
Ampere (A)
8.
A measuring instrument used to measure electric current.
9.
In a domestic circuit, parallel connection of devices is preferable for several reasons:
a. In series connection, if one of the devices is defective, if one of the devices is defective, then the current of the entire circuit is cut off. As a result, all the devices stop working. In parallel connection, even if one device is defective, the others continue working.
b. In series connection, selective operation of devices is not possible, but this is not so in the case of parallel connection.
c. In series connection, the same current passes through all the devices, regardless of the fact that different devices require different values of current to operate. In parallel connection, different values of current can be obtained for different devices according to their requirements.
10.
It means that 1 joule of work will be done in order to move 1 coulomb of charge from point A to B.
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CBSE 10th Standard CBSE Subjects
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