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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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:
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?
In a circuit, three resistors of 2Ω, 3Ω, and 6Ω are connected in parallel. The equivalent resistance is:
A battery of EMF 12V and internal resistance 2Ω is connected to an external resistance of 4Ω. The current flowing through the circuit is:
The resistivity of a material depends on:
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:
A light bulb rated 60W, 120V is connected to a 120V supply. The resistance of the bulb is:
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:
In a potentiometer experiment, the balancing length for a cell of EMF E is 75 cm. If another cell of EMF E/2 is used, the balancing length would be: