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Quiz 2
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When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be:
0%
20 W
0%
60 W
0%
180 W
0%
10 W
Explanation
20 W
n resistances, each of R Ω, are connected in parallel gives an equivalent resistance of R Ω. If these resistances were , connected in series, the combination would have a resistance in Ω is equal to
0%
n²R
0%
R/n²
0%
R/n
0%
nR
Explanation
n²R
Why is the Wheatstone bridge more accurate than other methods of measuring resistances:
0%
It is a null method
0%
It is based on Kirchhoffs laws
0%
It has four resistances
0%
It does not involve ohm's law
Explanation
It is a null method
A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :
0%
20 A
0%
5 A
0%
0.2 A
0%
None of these
Explanation
20 A
Ohm's law is valid when the temperature of conductor is :
0%
very low
0%
very high
0%
varying
0%
constant
Explanation
constant
The emf of a car battery is about:
0%
2.5 V
0%
4.5 V
0%
8.6 V
0%
12 V
Explanation
12 V
Emf is measured in :
0%
joule
0%
joule/coulomb
0%
joule-coulombs
0%
joule/coulomb/metre
Explanation
joule/coulomb
1 kilowatt hour is commonly known as :
0%
unit
0%
1 faraday
0%
1 curie
0%
None of these
Explanation
unit
How many joules are equal to I kWh?
0%
3.6 × 10
4
0%
3.6 × 10
5
0%
3.6 × 10
6
0%
None of these
Explanation
3.6 × 10
6
The temperature coefficient of resistance is expressed in :
0%
°C
0%
°C
-1
0%
m°C
-1
0%
None of these
Explanation
°C
-1
Copper wire is used as connecting wire because :
0%
copper has high electrical resistivity
0%
copper has low electrical resistivity
0%
copper has low electrical conductivity
0%
copper has high value of elasticity
Explanation
copper has low electrical resistivity
The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :
0%
resistor
0%
super-conductor
0%
thermocouple
0%
thermistor
Explanation
thermistor
The phenomenon of super-conductivity was discovered by :
0%
Ohm
0%
Onnes
0%
Edison
0%
None of these
Explanation
Onnes
The specific resistance of a conductor increases with :
0%
increase in temperature
0%
increase in cross-sectional area
0%
decrease in length
0%
decrease in cross-sectional area
Explanation
increase in temperature
In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :
0%
4 Ω
0%
2 Ω
0%
1 Ω
0%
\(\frac{1}{2}\) Ω
Explanation
2Ω
Two conductors of equal length and radii the ratio of 2 : 3 are; connected in parallel the source of electricity. The ratio of the velocity of electrons in the conductor be :
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2 : 3
0%
4 : 9
0%
1 : 1
0%
3 : 2
Explanation
1 : 1
In questions 38, the maximum value of current (l
max
) is given by the condition :
0%
l
max
= α - \(\frac{β^2}{2γ}\)
0%
l
max
= α - \(\frac{β^2}{2α}\)
0%
l
max
= α - \(\frac{γ^2}{2β}\)
0%
None of these
Explanation
l
max
= α - \(\frac{β^2}{2γ}\)
In questions 38, the line (t) after which the value of current reaches a maximum values given by :
0%
t = \(\frac{α}{β}\)
0%
t = \(\frac{β}{α}\)
0%
t = \(\frac{β}{γ}\ )
0%
t = \(\frac{γ}{β}\)
Explanation
t = \(\frac{α}{β}\)
The smallest resistance that can be obtained by the combination of n resistors each resistance r is :
0%
\(\frac{r}{n}\)
0%
nr
0%
\(\frac{n}{r}\)
0%
n²r
Explanation
\(\frac{r}{n}\)
Which of the following has a negative temperature coefficient of resistance?
0%
Tungsten
0%
Carbon
0%
Nichrome
0%
Platinum
Explanation
Carbon
0 h : 0 m : 1 s
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