JEE Physics - MCQ Practice Questions

A wire of resistance R is bent into a square loop. What is the equivalent resistance between two adjacent corners?

In a balanced Wheatstone bridge, if the resistance of one arm is changed by 10%, by what percentage should another arm be changed to maintain balance?

A battery of EMF 12V with internal resistance 2Ω is connected to an external resistance of 4Ω. What is the terminal voltage?

In an ammeter shunt connection, if the ammeter has resistance 1Ω and we want to measure up to 10A with a galvanometer of range 1mA, what should be the shunt resistance?

A metallic conductor's resistance increases with temperature. This is primarily because:

A heating element rated 1000W, 200V is connected to a 100V supply. The heat generated will be:

In a meter bridge, the null point is found at 60cm from left. If a standard resistance of 15Ω is on the right, the unknown resistance is:

A copper wire of diameter 1 mm carries a current of 5 A. If the drift velocity of electrons is 0.5 mm/s, find the number density of free electrons in copper. (Given: e = 1.6 × 10⁻¹⁹ C)

A potential divider uses a 100 cm wire of total resistance 10Ω. A cell of EMF 2V and negligible internal resistance is connected across it. What is the potential gradient along the wire?

In a meter bridge experiment, when the null point is at 40 cm from the left end, the unknown resistance is found to be 20Ω. What is the standard resistance used?

A battery of EMF E and internal resistance r is connected to an external resistance R. The terminal voltage is:

A cylindrical conductor has resistance R. If it is melted and reformed into a wire of half its original length and half its original cross-sectional area, the new resistance will be:

Two cells of EMF 1.5V each with internal resistances 0.5Ω are connected in series to an external resistance of 2Ω. What is the current in the circuit?

In a potentiometer, if the balancing length for a cell is 60 cm and for standard cell is 50 cm, what is the EMF of the unknown cell? (Standard cell = 1.018V)

A galvanometer with coil resistance 100Ω shows full-scale deflection at 10 mA. What shunt resistance is needed to convert it into an ammeter reading up to 1 A?

A rectangular conductor with dimensions 2cm × 3cm × 10cm is placed such that current flows through the 10cm length. If resistivity is 1.7 × 10⁻⁸ Ω·m, find the resistance:

A copper wire of length L and cross-sectional area A has resistance R. If the wire is stretched to double its length while maintaining the same volume, what is the new resistance?

A wire of resistance 5Ω is bent into a square loop. What is the equivalent resistance between two adjacent corners?

In a Wheatstone bridge at balance, if P = 10Ω, Q = 20Ω, and R = 15Ω, then S equals:

Two resistors R₁ and R₂ are connected in series with a battery. If R₁ = 2R₂ and the voltage across R₁ is 8V, the voltage across R₂ is: