12th Class Physics MCQS Chapter 2

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12th Class Physics MCQS


Calculate current in 2 2R /4? resistor.
1:00 AM
2R /3?
R/3?
2R /4?

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:
2
4
1
1

Thermistor with high – ve temperature coefficient are very accurate for measuring low temperature especially near is.
200 kelvin
70 kelvin
10 kelvin
35 kelvin

The Kirchhoff 1st rule is manifestation of:
Law of conservation of energy
None of above
Law of Conservation of charge
Law of conservation of mass

Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is:
4.5?
4?
5?
3?

Thermosouple is an arrangement of two different metals:
To convert electrical energy into heat energy
Two convert heat energy into electrical energy
To convert heat energy into chemical energy
To produce more heat

Magnetic effect of current is used
To detect a current
To measure a current
In electric motor
All of above

e.m.f is the conversion of ————— energy into electrical energy
None of these
Solar
Chemical
Light

The product of resistance and conductance is
Resistivity
1
Zero
Conductance

For non-ohmic devices, the graph between V and I is
Not a straight line
A curve
A straight line
All of above

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