Class-10,Electricity

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Name of Student *

Contact No. *

Q1) Which of the following is/are good conductor(s) of electricity? *

1 point

Mica, Quartz

Metals, Mica

Metals, Rubber

Metals, Quartz

Q2) When a steady current flows through a conductor, the electrons in it move with certain average speed known as: *

1 point

Root mean square speed

Drift speed

Accelerated speed

Average velocity

Q3) The function of rheostat in an electrical circuit is to: *

1 point

Increase the resistance in the circuit.

Decrease the resistance in the circuit.

Change the resistance in the circuit.

None of these

Q4) Which of the following is incorrect about the heat produced in a resistor? *

1 point

Directly proportional to the time for which the current flows through the resistors.

Directly proportional to the resistance for a given current.

It is directly proportional to the square of the current.

None of these

Q5) ‘Electrons are consumed in an electric circuit’.The above statement is: *

1 point

True

Partially true

False

Partially false

Q6) Which of the following fuse should be used for an electric iron of 1 kW when operated at 220 V? *

1 point

3 A

7 A

1 A

5 A

Q7) In an electric circuit, the direction of electric current is: *

1 point

from the negative terminal to the negative terminal.

from the positive terminal to the negative terminal.

from the negative terminal to the positive terminal.

from the positive terminal to the positive terminal.

Q8) Calculate the resistance of a conductor if the current flowing through it is 0.2 A, when potential difference applied is 0.8 V. *

1 point

(d) 0.25Ω

(b) 3Ω

(a) 4Ω

Q9) Why is tungsten used exclusively for the filament of an incandescent lamp? *

1 point

The melting point of tungsten is very high.

Tungsten can be drawn into thin wires which in turn offers high resistance.

Tungsten has a fairly good resistivity.

All of these

Q10) 0.5 coulombs of charge flows through a conductor in 2 seconds. What is the magnitude of the current flowing through the conductor? *

1 point

1 A

0.2 A

0.25 A

0.5 A

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