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Electric Circuit and Ohms Law
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We have three resistances of values 2 Ω, 3 Ω and 6 Ω. Which of the following combination will give an effective resistance of 4 Ω
6 Ω resistance in series with parallel combination of 2 Ω and 3 Ω resistance
All the three resistances in parallel
3 Ω resistance in series with parallel combination of 2 Ω and 6 Ω resistance
2 Ω resistance in series with parallel combination of 3 Ω and 6 Ω resistance
Three equal resistors connected in series across a source of emf together dissipate 10 watts ofpower.
What would be the power dissipated in the same resistors when they are connected in parallel across the same source of emf
10 watts
90 watts
270 watts
30 watts
Four identical resistors are first connected in parallel and then inseries.
The resultant resistance of the first combination to the second will be
4 times
1 / 16 times
1 / 4 times
16 times
When P = Power, V = Voltage, I = Current, R = Resistance and G = Conductance, which of the following relation is incorrect
V = √ (PR)
P = V2G
I = √ (P / R)
G = P / I2
The resistance of a 100 W, 200 V lamp is
200 ohm
100 ohm
400 ohm
1600 ohm
Which of the following could be the value of resistivity of copper
1.7 x 10-6 ohm-cm
1.7 x 10-8 ohm-cm
1.7 x 10-4 ohm-cm
1.6 x 10-5 ohm-cm
Which of the following is a defined quantity
Length
polarity
Money
Pressure
A copper wire of length l and diameter d has potential difference V applied at its twoends.
The drift velocity is vd. If the diameter of wire is made d/3, then drift velocity becomes
9 vd
vd
vd / 9
vd /3
Two resistances R1 and R2 give combined resistance of 4.5 ohms when in series and 1 ohm when inparallel.
The resistances are
1.5 ohms and 3 ohms
3 ohms and 9 ohms
3 ohms and 6 ohms
1.5 ohms and 0.5 ohms
The unit of electrical conductivity is
mho / metre
ohm / metre
mho / sq.m
ohm / sq.m
Current I in the figure is
0.5A
3.5A
1.5A
2.5A
Which of the following bulbs will have the least resistance
220 V, 100 W
115 V, 60 W
220 V, 60 W
115 V, 100 W
The basic unit for luminous intensity is
candela
Ampere
Radian
coulomb
Twelve wires of same length and same cross-section are connected in the form of a cube as shown in figurebelow.
If the resistance of each wire is R, then the effective resistance between P and Q will be
5 / 6 R
R
4 / 3 R
3 / 4 R
Conductance is expressed in terms of
ohm / m
m / ohm
mho
mho / m
Two 1 kilo ohm, 1/2 W resistors are connected inseries.
Their combined resistance value and wattage will be
l kΩ, 1/2 W
2 kΩ, 1 W
2 kΩ, 1/2 W
2 kΩ, 2 W
The ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly
2
1 / 2
4
1 / 4
1
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