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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The EMF of a cell is 2V and its internal resistance is 0.5Ω. When connected to external resistance, the terminal voltage is 1.8V. The current in the circuit is:
Three identical cells, each of EMF 1.5V and internal resistance 1Ω, are connected in series. The total EMF and internal resistance are:
A rheostat is used in a circuit to:
When a conductor is heated, its resistance increases because:
A copper wire and an aluminum wire of same length and cross-sectional area carry the same current. Which has greater voltage drop?
In a parallel combination of resistors, the voltage across each resistor is:
A heating element of resistance R is connected to a battery of EMF E and internal resistance r. Maximum power is dissipated in R when:
In a circuit with a battery of 10V and total resistance 5Ω, the power dissipated is:
Two resistors of 4Ω and 6Ω are connected in series with a 10V battery. The current through the circuit and power dissipated are respectively:
In a circuit, if the current increases when voltage increases, the resistance must:
A wire of length L and cross-sectional area A has resistivity ρ. If the wire is stretched to double its length, what will be the new resistance?
Which of the following materials has the lowest temperature coefficient of resistance?
In a Wheatstone bridge, if P/Q = R/S, then the galvanometer shows zero deflection. This condition is called:
A battery with EMF E and internal resistance r is connected to an external resistance R. What is the terminal voltage?
Five resistors each of 5Ω are connected in parallel. The equivalent resistance is:
A potentiometer wire of length 100 cm has resistance 10Ω. A standard cell of EMF 1.5V is balanced at 40 cm. What is the EMF of an unknown cell if balanced at 65 cm?
The specific resistance (resistivity) of a material depends on:
In a circuit, the current through a 10Ω resistor is 2A. If this resistor is replaced by 5Ω, and the rest of the circuit remains unchanged, the new current will be:
A uniform wire of length L is cut into n equal parts. When connected in parallel, the equivalent resistance is:
The drift velocity of electrons in a conductor is of the order of: