Ohms Law Quiz | Ohms Law Objective Type Questions and Answerss

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Questions
21 For a fixed supply voltage the current flowing through a conductor will decrease when
A cross-sectional area of the conductor is increased
B length of the conductor is increased
C length of the conductor is reduced
D cross-sectional area is increased and length is decreased

Answer: length of the conductor is increased
22 A lamp of 100 W at 200 V is supplied current at 100 volts. It will be equivalent to the lamp of
A 50 W
B 40 W
C 25 W
D 10 W

Answer: 25 W
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23 When current flows through heater coil it glows but supply wiring does not glow because
A supply wiring is covered with insulation layer
B current through supply line flows at slower speed
C supply wires arc made of superior material
D resistance of heater coil is more than that supply wires

Answer: resistance of heater coil is more than that supply wires
24 Two electric bulbs of 100 W, 200 V are put in series and the combination is supplied 100 V. The power consumption of each bulb will be
A 100 / 2 W
B 100 / 4 W
C 100 / 16 W
D All of these

Answer: 100 / 16 W
25 Which of the following lamps will have least resistance at room temperature ?
A 200 W, 220 V
B 100 W, 220 V
C 60 W, 220 V
D All of these

Answer: 200 W, 220 V
26 The value of supply voltage for 500 W ,5 ohm load is
A 500 V
B 100V
C 50 V
D None Of The Above

Answer: 50 V
27 100 resistors of 100 ohms each arc connected in parallel. Their equivalent resistances will be
A 10,000 ohms
B 100 ohms
C 1 ohm
D None Of The Above

Answer: 10,000 ohms
28 The ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly
A 4
B 2
C 1 / 2
D 1 / 4

Answer: 4
29 The current carrying capacity of the fuse material depends on
A cross-sectional area
B length
C material
D all of the above

Answer: all of the above
30 Which material is expected to have least resistivity?
A Copper
B Lead
C Mercury
D Zinc

Answer: Copper
31 Consider a circuit with two unequal resistances in parallel, then
A large current flows in large resistor
B current is same in both
C potential difference across each is same
D smaller resistance has smaller conductance

Answer: potential difference across each is same
32 In which of the following cases is Ohm’s law not applicable?
A Electrolytes
B Arc lamps
C Insulators
D None of the above

Answer: Insulators
33 A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is V. If the diameter of wire is made d/4, then drift velocity becomes
A V/16
B 16V
C V
D V/4)

Answer: 16V
34 Ohm’s law is not applicable to
A dc circuits
B high currents
C semi-conductors
D All of these

Answer: semi-conductors
35 Conductance is expressed in terms of
A mho
B mho/m
C ohm/m
D m/ohm

Answer: mho
36 In a current-voltage relationship graph of a linear resistor, the slope of the graph will indicate
A conductance
B resistance
C resistivity
D None of the above

Answer: conductance
37 How many different combinations may be obtained with three resistors, each having the resistance R ?
A 3
B 4
C 5
D 6

Answer: 4
38 Ohm's law is not applicable to
A DC circuits
B high currents
C semi-conductors
D None of the above

Answer: semi-conductors
39 Voltage between point P and Q will be
A 40 V
B 22.5 V
C 20 V
D All Of These

Answer: 22.5 V
40 Least current will flow through
A 25 ohm resistor
B 18 ohm resistor
C 10 ohm resistor
D None Of The Above

Answer: 25 ohm resistor
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