The SI unit of resistivity is:
- A$\Omega / m$
- BΩ
- ✓Ωm
- DΩm²
Answer: C.
View full solution →Question types
Current Electricity question types
148 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
148
Questions
6
Question groups
5
Question types
01
M.C.Q (1 Marks)
37 Q→021 Marks Question
47 Q→032 Marks Questions
36 Q→043 Marks Question
16 Q→05Case study (4 Marks)
3 Q→06Fill in the blanks.
9 Q→Sample Questions
Current Electricity questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In the given figure, if the Wheatstone bridge is in balanced condition, then the value of resistance 'S' will be
- A12 Ω
- B9 Ω
- C3.0 Ω
- ✓6 Ω
Answer: D.
View full solution →Electron and proton beams are travelling parallel to each other in the same direction. There will be ___________ between them.
- Aforce of attraction
- ✓force of repulsion
- Cneither attraction nor repulsion
- Dattractive or repulsive forces depends on the motion of the beams
Answer: B.
View full solution →In a sensitive Wheatstone bridge, current in the galvanometer in the state of slight deflection from the position of balance is:
- Azero
- ✓more
- Cless
- Dnegligible
Answer: B.
View full solution →Two similar cells, whether joined in series or in parallel, same current flows in external resistance of 2. The internal resistance of each cell is:
- A1 ohm
- ✓2 ohm
- C0.15 ohm
- D10 ohm
Answer: B.
View full solution →Draw a graph between potential difference (V) and current (I) according Ohm's law.
Write difference between terminal voltage and electromotive force of a cell.
What is internal resistance of a cell?
Electromotive forces of two cells are $\varepsilon_1$ and $\varepsilon_2$ and their internal resistances are $r_1$ and $r_2$ Both cells are joined in lateral combination. Write equivalent electromotive force of this combination.
View full solution →V-I graph of wire of any metal at two different temperatures $T _1$ and $T _2$ are shown in the given figure. Which of the two temperatures is higher and why?
View full solution →If 12 resistances each of $12 \Omega$ resistance are joined in a cubical network, then calculate the equivalent resistance at the corners opposite to diagonals of this network.
View full solution →In the given figure, point A is at zero potential. Use Kirchhoff's rules to find out the potential at B.
Calculate the magnitude of equivalent resistance across the points $a$ and $b$ in the network shown in the given figure.
View full solution →Calculate the value of $i$ as shown in the figure.
View full solution →In the given figure, if the Wheatstone Bridge is balanced, then find the magnitude of unknown resistance $X$. 
View full solution →Obtain essential expression for balanced position of Wheatstone Bridge.###Explain the principle of Wheatstone Bridge. How can we find the resistance of any resistor using this principle?
Write first rule of Kirchhoff (junction rule).By drawing circuit diagram of Wheatstone Bridge, obtain condition for zero deflection in the bridge.
State Kirchhoff's laws and explain them by giving examples.###Explain that first law of Kirchhoff is equivalent to law of conservation of charge and the second law is a descriptive form of Ohm's law.###For a current carrying conductor, write Kirchhoff's laws of charge and energy conservation.
What is an electric cell? Describe its construction. How many types of electric cells are there? By defining electromotive force of a cell, establish an expression for internal resistance of cell in any circuit and state factors on which internal resistance depends.
(i) What is meant by electric power? Prove that $P=\frac{V^2}{R}$ or $P=I^2 R$. Define one-watt electric power.(ii) Define electric energy. Prove that $P = I ^2 R \Delta t$
View full solution →In the given figure, a part ABC of electric circuit is shown. The magnitudes of potentials at points $A, B$ and $C$ are and respectively, then find the value of potential at point $O$.
View full solution →A thick wire of $15 \Omega$ is stretched to three times its original length. Assuming that the density of the wire remains unchanged, calculate the resistance of the new wire.
View full solution →A wire is stretched to reduce its diameter to half. What will be the magnitude of its new resistance?
The magnitude of drift velocity of electron per unit electric field is called $...............$
View full solution →Kirchhoff's loop rule is result of conservation of $...............$
View full solution →Kirchhoff's current rule is as a result of conservation of $...............$
View full solution →According to Kirch off's law, the $...............$ of all currents meeting at a junction is zero.
View full solution →Internal resistance of the cell depends on electrolyte and $...............$
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