JEE Physics - MCQ Practice Questions
Physics is where JEE ranks are usually won or lost, since a single conceptual slip changes the whole answer. Questions here span mechanics, rotational motion, thermodynamics, waves and oscillations, electrostatics, current electricity, magnetism, optics, and modern physics. Numerical problems carry full derivations so you can see which step you skipped, not just which option was right.
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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?
In a Wheatstone bridge, if the four resistances are P, Q, R, and S connected in order, and the galvanometer shows zero deflection, which condition is satisfied?
An ideal ammeter connected in series with a circuit has resistance of:
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?
A battery of EMF E and internal resistance r is connected to an external resistance R. The terminal voltage is:
In carbon resistors, color bands are used for identification. What does the third band represent?
The internal resistance of a Leclanche cell is approximately:
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)
An electric heater rated 500W, 250V is used for 4 hours daily. The energy consumed in one day is:
The equivalent resistance between two opposite corners of a cube made of 12 wires of 1Ω each is:
If the cross-sectional area of a wire is doubled while keeping length and material constant, how does resistivity change?
The temperature coefficient of resistance for a conductor is positive. This means:
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?
In a circuit with pure resistance, the phase difference between voltage and current is:
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: