1 |
Heat sensitive resistors are called. |
resistors
Capacitor
Thermistors
Inductors
|
2 |
A rheostat can operate as. |
Amplifier
Potential divider
Oscillator
Transformer
|
3 |
The thermistors convert changes of temperature into. |
Light energy
Electric voltage
Heat
Sound
|
4 |
Resistance tolerance for gold colour is. |
50%
30%
20%
5%
|
5 |
If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be. |
600 Ohm
550 Ohm
450 Ohm
400 Ohm
|
6 |
In carbon resistors, then value of Blue colour is. |
6
7
8
9
|
7 |
Colour codes are used to calculate the. |
Nature of resistor
Numerical value of resistance
Potential difference
Current
|
8 |
A certain wire has a resistance R, the resistivity of an other wire of an identical material with the first, except for twice its diameter is. |
1/4 R
4R
2R
Same as R
|
9 |
A substance having the negative temperature co efficient of resistivity out of the following is. |
Carbon
Iron
Tungsten
Gold
|
10 |
Resistivity at a given temperature depends upon. |
Area of cross section
Length
Nature of material of conductor
Both length and area
|
11 |
The SI unit of resistivity is. |
Ohm m-2
Ohm m-1
Ohm m
Ohm
|
12 |
mho -m-1 is the unit of. |
Resistance
Resistivity
Conductance
Conductivity
|
13 |
The reciprocal of resistance is called. |
Capacitance
Resistance
Conductance
Inductance
|
14 |
The unit of temperature co efficient of resistivity is. |
Ohm -m
K-1
K
Ohm
|
15 |
Specific resistance of a material depends upon. |
Length
Area
Temperature
Both A and B
|
16 |
When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part. |
is doubled
Remains the same
Is halved
Is one fourth
|
17 |
The current through a resistance of 100 Ohm when connecting across a source of 220 V is. |
22000 A
22 A
2.2 A
0.45 A
|