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WorksheetsElectricity Quiz
Total questions: 20
Worksheet time: 16mins
1. An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
0.92 A
2.9 A
9.2 A
92 A
2. When a 4 Ω resistor is connected across the terminals of a 2 V battery, the amount of charge passing through the resistor per second is:
0.5
1
2
4
Keeping the potential difference constant, the resistance of the circuit is halved. The current will become:
A. One-fourth
B. Four times
C. Half
D. Double
If in the given arrangement, the three resistors are to be replaced by a single resistor. What will be the value of this resistor?
4Ω
6Ω
9Ω
18Ω
The potential difference across the 3 Ω resistor in the following diagram is:
1/9V
1/2V
2V
1V
V1, V2 and V3 are the potential differences across the 1Ω, 2Ω and 3Ω resistors in the following diagram, and the current is 5A. Which of the following shows the correct values of V1, V2 and V3 measured in volts?
A. V1 =1, V2 = 2 and V3 = 3
B. V1 =5, V2 = 10 and V3 = 15
C. V1 =5, V2 = 2.5 and V3 = 1.6
D. V1 =4, V2 = 3 and V3 = 2
A wire of resistance R1 is cut into 3 equal pieces. These 3 pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio R1/ R2 is:
1/9
1/3
3
9
A wire of length ‘l’, made of material having resistivity ‘ρ’ is cut into two equal parts. The resistivity of the
two parts are equal to,
ρ
ρ/2
2ρ
4ρ
When a current 'I' flows through a resistance 'R' for time 't' the electrical energy spent is given by
A. IRt
B. I2Rt
C. IR2t
D. I2R/t
Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them is in the ratio.
A. 2:1
B. 1:2
C. 4:1
D. 1:1
At a given time, a house is supplied with 100 A at 220 V. How many 110 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?
A. 200
B. 193
C. 293
D. 393
If the current flowing through a fixed resistor is halved, the heat produced in it will become:
One-fourth
One-half
Double
Four times
In the given figure, the resistors.
6 Ω, 3 Ω and 9 Ω are in series
9 Ω and 6 Ω are in parallel and the combination is in series with 3 Ω
3 Ω, 6 Ω and 9 Ω are in parallel
3 Ω and 6 Ω are in parallel and the combination is in series with 9 Ω
A boy records that 4000 J of work is required to transfer 10 C of charge between two points of a resistor of 50 Ω. The current passing through it i
2 A
4 A
8 A
16 A
A cell, a resistor, a key, and an ammeter are arranged as shown in the circuit diagrams. The current recorded in the ammeter will be
maximum in (i)
maximum in (ii)
maximum in (iii)
same in all the cases
Calculate the current flows through the 10 Ω resistor in the following circuit.
1.2 A
0.6 A
0.2 A
2.0 A
A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is
2.5 A
5.0 A
7.5 A
10 A
A student carries out an experiment and plots the I-V graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is true?
(a) R1 = R2 = R3
(b) R1 > R2 > R3
(c) R3 > R2 > R1
(d) R2 > R3 > R1
A wire of length l is drawn to a length ‘2l’, then its resistivity
(a) increases by 4 times
(b) decreases by ¼ th of original value
(c) increases 2 times
(d) will not change
A: The value of current in ammeter is same independent of its position in the series electric circuit.
R: In a series combination of resistors current is same in every part of the circuit.
a) Both A and R are true, and R is the correct explanation of the assertion.
b) Both A and R are true, but R is not the correct explanation of the assertion.
c) A is true, but R is false.
d) A is false, but R is true
