What is the maximum resistance which can be made using five resistors each of $\frac{1}{5}\Omega$?
- A$\frac{1}{5}\Omega$
- B$10\Omega$
- C$5\Omega$
- ✓$1\Omega$
Answer: D.
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Electricity question types
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Sample Questions
Electricity questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
A student carries out an experiment and plots the $V-I$ graph of three samples of nichrome wire with resistances $R_1, R_2$ and $R_3$ respectively $($Figure$)$. Which of the following is true?
- A$R_1 = R_2 = R_3$
- B$R_1 > R_2 > R_3$
- ✓$R_3 > R_2 > R_1$
- D$R_2 > R_3 > R_1$
Answer: C.
View full solution →In an electrical circuit three incandescent bulbs A, B and C of rating 40W, 60W and 100W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
- ABrightness of all the bulbs will be the same.
- BBrightness of bulb A will be the maximum.
- ✓Brightness of bulb B will be more than that of A.
- DBrightness of bulb C will be less than that of B.
Answer: C.
View full solution →What is the minimum resistance which can be made using five resistors each of $\frac{1}{5}\Omega$?
- A$\frac{1}{5}\Omega$
- ✓$\frac{1}{25}\Omega$
- C$\frac{1}{10}\Omega$
- D$25\Omega$
Answer: B.
View full solution →A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be:
- AMaximum in (i).
- BMaximum in (ii).
- CMaximum in (iii).
- ✓The same in all the cases.
Answer: D.
View full solution →What is the commercial unit of electrical energy? Represent it in terms of joules.
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.
Should the resistance of an ammeter be low or high? Give reason.
How does use of a fuse wire protect electrical appliances?
A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5Ω when connected to a 10V battery. Calculate the resistance of the electric lamp.
Now if a resistance of 10Ω is connected in parallel with this series combination, what change (if any) in current flowing through 5Ω conductor and potential difference across the lamp will take place? Give reason.
Now if a resistance of 10Ω is connected in parallel with this series combination, what change (if any) in current flowing through 5Ω conductor and potential difference across the lamp will take place? Give reason.
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2Ω in series with a combination of two resistors (4Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2Ω resistor be the same as that across the parallel combination of 4Ω resistors? Give reason.
What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?
Why is parallel arrangement used in domestic wiring?
What is electrical resistivity of a material? What is its unit? Describe an experiment to study the factors on which the resistance of conducting wire depends.
Three $2\Omega$ resistors, A, B and C, are connected as shown in Figure. Each of them dissipates energy and can withstand a maximum power of 18W without melting. Find the maximum current that can flow through the three resistors?
View full solution →State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
$B_1, B_2$ and $B_3$ are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3 A is recorded by the ammeter A
.
i. What happens to the glow of the other two bulbs when the bulb $B_1$ gets fused?
ii. What happens to the reading of $A_1, A_2, A_3$ and $A$ when the bulb $B_2$ gets fused?
iii. How much power is dissipated in the circuit when all the three bulbs glow together?
View full solution →.
i. What happens to the glow of the other two bulbs when the bulb $B_1$ gets fused?
ii. What happens to the reading of $A_1, A_2, A_3$ and $A$ when the bulb $B_2$ gets fused?
iii. How much power is dissipated in the circuit when all the three bulbs glow together?
What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.
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