JEE Physics - MCQ Practice Questions
Practice free JEE Physics multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.
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A wire of resistance R is bent into a square loop. What is the equivalent resistance between two adjacent corners?
The SI unit of electrical conductivity is:
A copper wire and an aluminum wire of the same length and cross-sectional area carry the same current. Which wire has greater power dissipation?
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?
The drift velocity of electrons in a copper wire is approximately:
Two resistances R₁ and R₂ are connected in parallel. If R₁ = 4Ω and R₂ = 6Ω, what is the equivalent resistance?
A battery of EMF 12V with internal resistance 2Ω is connected to an external resistance of 4Ω. What is the terminal voltage?
The color code of a resistor is Brown-Black-Red-Gold. Its resistance value is:
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?
The specific resistance (resistivity) of a conductor depends on:
In a potentiometer experiment, the null point is obtained at 40cm for a cell of EMF E₁. When a resistance of 5Ω is connected in series with the cell, the null point shifts to 30cm. The internal resistance of the cell is:
Three resistors of 2Ω, 3Ω, and 6Ω are connected in parallel. The equivalent resistance is:
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:
The sensitivity of a galvanometer can be increased by:
A wire of length L and cross-sectional area A has resistance R. If the wire is stretched to length 2L without change in volume, the new resistance will be:
The EMF of a cell is 1.5V. When a current of 2A is drawn, the terminal voltage is 1.2V. The internal 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)
Two wires of the same material have lengths in ratio 2:3 and diameters in ratio 1:2. Their resistances are in the ratio?