# 12th Class Physics MCQS Chapter 2

#### 12th Class Physics MCQS

Semiconductor diodes are called:
Ohmic
none of above
Both a & b
non ohmic

The resistivity of two wires is 1 and ?2 which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:
(
?1/?2
1/?1+ 1/?2
?1+?2/2

Tolerance of “Gold” band.
±20%
±5%
±10%
±15%

106 electrons are moving through a wire per second the current developed is:
1.6 x 10-19 A
1A
106 A
1.6 x 10-13A

When a wire is stretched and its radius becomes r/2, then its resistance will be
0
4 R
2R
16 R

A rheostat can be used as variable resistor as well as a————-
Wheat stone bridge
Potential divider
Power divider
Current divider

In gas the charge carriers are:
None of above
Electrons
Both a & b
Ions

Unit (S.I) of temperature coefficient of resistivity of a material is
K
oC
K-2
K-1

The heat produced by passage of current.
H=IR2T
H=I/Rt
H=I2/Rt
H=I2Rt

The free electrons experience force.
In direction of E
All of the above
In direction of -E
Both A and B

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