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 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:
If the length of a conductor is doubled and the diameter is also doubled, what happens to its resistance?
A 60W bulb and a 100W bulb are connected in series across a 200V supply. Which bulb glows brighter?
An ammeter has a low resistance and a voltmeter has a high resistance. This is because:
Which of the following best explains why semiconductor resistance decreases with increase in temperature?
Three cells of EMF 2V, 4V, and 3V with negligible internal resistance are connected in series, opposing each other. Net EMF is:
A battery of EMF 12V and internal resistance 2Ω is connected to a load resistance R. For maximum power transfer, R should be:
The electric field inside a copper conductor carrying current is approximately:
A 100Ω resistor and a 200Ω resistor are connected in parallel, and this combination is in series with a 50Ω resistor. Total resistance is:
The resistance of a wire at 0°C is R₀. If its temperature coefficient is α, its resistance at temperature T is:
When a superconductor is cooled below its critical temperature, its resistance becomes zero. What is the effect on current flowing through it when connected to a constant voltage source?
A wire of length L and cross-sectional area A has resistivity ρ. If the wire is stretched to 2L without change in volume, what will be its new resistance?
Two resistances of 3Ω and 6Ω are connected in parallel. The equivalent resistance is:
In a Wheatstone bridge, if P/Q = R/S, then the current through the galvanometer is: