Q.1
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
Q.2
Out of the following which is not a poor conductor?
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
Q.4
Which of the following quantities remain the same in all parts of a series circuit?
Q.5
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
Q.6
Conductance is reciprocal of
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
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
Q.9
Which of the following statement is true both for a series and a parallel D.C. circuit?
Q.10
International ohm is defined in terms of the resistance of
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
Q.12
Ohm’s law is not applicable to
Q.13
Which of the following statement is true?
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?
Q.15
A substance whose molecules consist of dissimilar atoms is called
Q.16
If a parallel circuit is opened in the main line, the current
Q.17
The property of a conductor due to which it passes current is called
Q.18
The substances which have a large number of free electrons and offer a low resistance are called
Q.19
When electric current passes through a metallic conductor, its temperature rises. This is due to
Q.20
The number of electrons in the outer most orbit of carbon atom is
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
Q.22
A glass rod when rubbed with silk cloth is charged because
Q.23
Insulating materials have the function of
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
Q.25
The ratio of mass of proton to that of electron is nearly
Q.26
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel.
The total resistance of the combination is
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
Q.28
What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is
Q.29
The condition for the validity under Ohm’s law is that
Q.30
The condition for the validity under Ohm's law is that
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