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Quiz 2
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Q.1
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
0.4 ohm
0.6 ohm
0.8 ohm
1.0 ohm
Q.2
Out of the following which is not a poor conductor?
Cast iron
Copper
Carbon
Tungsten
Q.3
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will
Decrease
Increase
Remain constant
None of the above
Q.4
Which of the following quantities remain the same in all parts of a series circuit?
Voltage
Current
Power
Resistance
Q.5
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
400 Q
600 Q
800 Q
1000 Q
Q.6
Conductance is reciprocal of
Resistance
Inductance
Reluctance
Capacitance
Q.7
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains
Length of heating element should be decreased
Length of heating element should be increased
Length of heating element has no effect on heating if water
None of the above
Q.8
A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is
6.4 A, 6.9 A
6.4 A, 9.6 A
4.6 A, 6.9 A
4.6 A, 9.6 A
Q.9
Which of the following statement is true both for a series and a parallel D.C. circuit?
Elements have individual currents
Currents are additive
Voltages are additive
Power are additive
Q.10
International ohm is defined in terms of the resistance of
A column of mercury
A cube of carbon
A cube of copper
The unit length of wire
Q.11
When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is
A.C.
D.C.
Any of above two
None of the above
Q.12
Ohm’s law is not applicable to
vacuum tubes
carbon resistors
high voltage circuits
circuits with low current densities
Q.13
Which of the following statement is true?
A galvanometer with low resistance in parallel is a voltmeter
A galvanometer with high resistance in parallel is a voltmeter
A galvanometer with low resistance in series is an ammeter
A galvanometer with high resistance in series is an ammeter
Q.14
The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?
The current through each bulb in same
The voltage across each bulb is not same
The power dissipation in each bulb is not same
None of the above
Q.15
A substance whose molecules consist of dissimilar atoms is called
Semiconductor
Super-conductor
Compound
Insulator
Q.16
If a parallel circuit is opened in the main line, the current
Increases in the branch of the lowest resistance
Increases in each branch
Is zero in all branches
Is zero in the highest resistive branch
Q.17
The property of a conductor due to which it passes current is called
Resistance
Reluctance
Conductance
Inductance
Q.18
The substances which have a large number of free electrons and offer a low resistance are called
Insulators
Inductors
Semiconductors
Conductors
Q.19
When electric current passes through a metallic conductor, its temperature rises. This is due to
Collisions between conduction electrons and atoms
The release of conduction electrons from parent atoms
Mutual collisions between metal atoms
Mutual collisions between conducting electrons
Q.20
The number of electrons in the outer most orbit of carbon atom is
3
4
6
7
Q.21
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be
160 ohms
80 ohms
20 ohms
10 ohms
Q.22
A glass rod when rubbed with silk cloth is charged because
It takes in proton
Its atoms are removed
It gives away electrons
It gives away positive charge
Q.23
Insulating materials have the function of
Preventing a short circuit between conducting wires
Preventing an open circuit between the voltage source and the load
Conducting very large currents
Storing very high currents
Q.24
A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be
80 m
60 m
40 m
20 m
Q.25
The ratio of mass of proton to that of electron is nearly
1840
1480
30
4
Q.26
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel.
The total resistance of the combination is
5 ohms
10 ohms
15 ohms
55 ohms
Q.27
If I, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to
I²Rt
I²Rt²
I²R²t
I²R²t²
Q.28
What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is
Practically zero
Low
High
Very high
Q.29
The condition for the validity under Ohm’s law is that
resistance must be uniform
current should be proportional to the size of the resistance
resistance must be wire wound type
temperature at positive end should be more than the temperature at negative end
Q.30
The condition for the validity under Ohm's law is that
Resistance must be uniform
Current should be proportional to the size of the resistance
Resistance must be wire wound type
Temperature at positive end should be more than the temperature at negative end
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