Q.1
Which of the following can have negative temperature coefficient?
Q.2
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be
Q.3
When one leg of parallel circuit is opened out the total current will
Q.4
All good conductors have high
Q.5
What will be energy used by the battery if the battery has to drive 6.28 x 10¹⁸ electrons with potential difference of 20 V across the terminal ?
Q.6
Ohm's law is not applicable to
Q.7
Switching of a lamp in house produces noise in the radio. This is because switching operation produces
Q.8
You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect
Q.9
Which of the following materials has a negative temperature coefficient of resistance?
Q.10
Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
Q.11
In a series circuit with unequal resistances
Q.12
Which one of the following does not have negative temperature coefficient?
Q.13
Two resistors are said to be connected in series when
Q.14
Resistance of a tungsten lamp as applied voltage increases
Q.15
Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?
Q.16
Which is the best conductor of electricity?
Q.17
Heat in a conductor is produced on the passage of electric current due to
Q.18
Resistance of carbon filament lamp as the applied voltage increases.
Q.19
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes
Q.20
Bulbs in street lighting are all connected in
Q.21
Nichrome wire is an alloy of
Q.22
Resistance of 220 V, 100 W lamp will be
Q.23
Which of the following materials has the least resistivity ?
Q.24
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open
Q.25
Which of the following material has nearly zero temperature coefficient of resistance?
Q.26
Conductance: mho ::
Q.27
The resistance of a conductor varies inversely as
Q.28
A resistance having rating 10 ohms, 10 W is likely to be a
Q.29
An electric filament bulb can be worked from
Q.30
With rise in temperature the resistance of semiconductors
0 h : 0 m : 1 s