Unit II: Current Electricity - Online Test
Q1. The following graph shows
current versus voltage values of some unknown conductor. What is the resistance
of this conductor?
Answer : Option A
Explaination / Solution:
Q2. A wire of resistance 2 ohms
per meter is bent to form a circle of radius 1m. The equivalent resistance
between its two diametrically opposite points, A and B as shown in the figure
is
Answer : Option B
Explaination / Solution:
Q3. A toaster operating at 240
V has a resistance of 120 Ω. The power is
Answer : Option C
Explaination / Solution:
Q4. A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of different colours for its identification. The colour code sequence will be
Answer : Option B
Explaination / Solution:
Q5. What is the value of
resistance of the following resistor?
Answer : Option A
Explaination / Solution:
Q6. Two wires of A and B with
circular cross section made up of the same material with equal lengths. Suppose
RA = 3 RB, then what is the ratio of radius of wire A to
that of B?
Answer : Option C
Explaination / Solution:
Q7. A wire connected to a power
supply of 230 V has power dissipation P1. Suppose the wire is cut
into two equal pieces and connected parallel to the same power supply. In this
case power dissipation is P2. The ratio P2 / P1
is
Answer : Option D
Explaination / Solution:
Q8. In India electricity is
supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the
resistance of a 60W bulb for use in India is R, the resistance of a 60W bulb
for use in USA will be
Answer : Option C
Explaination / Solution:
Q9. In a large building, there
are 15 bulbs of 40W, 5 bulbs of 100W, 5 fans of 80W and 1 heater of 1kW are
connected. The voltage of electric mains is 220V. The minimum capacity
of the main fuse of the building will be
Answer : Option D
Explaination / Solution:
Q10. There is a current of 1.0 A
in the circuit shown below. What is the resistance of P ?
Answer : Option C
Explaination / Solution:
