JEE Physics - MCQ Practice Questions

A uniform wire of length L is cut into n equal parts. When connected in parallel, the equivalent resistance is:

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:

Three cells of EMF 2V, 4V, and 3V with negligible internal resistance are connected in series, opposing each other. Net EMF is:

A 100Ω resistor and a 200Ω resistor are connected in parallel, and this combination is in series with a 50Ω resistor. Total resistance is:

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?

In a Wheatstone bridge, if P/Q = R/S, then the current through the galvanometer is:

A cell of EMF E and internal resistance r is connected to an external resistance R. The terminal voltage V is given by:

A potentiometer wire of length 100 cm has resistance 10Ω. A standard cell of EMF 1.5V is balanced at 60 cm. What is the EMF of unknown cell if it balances at 80 cm?

A nichrome wire and a copper wire of same length and area are connected in series. Which experiences greater heat dissipation?

In a meter bridge experiment, the null point is obtained at 40 cm from the left end. If the left resistance is 8Ω, what is the right resistance?

A battery of EMF 10V supplies current to a circuit. If the voltage across external resistance is 9V, what is the internal resistance if external resistance is 90Ω?

In a circuit with capacitors, which quantity is continuous across the capacitor?

Which of the following shows non-ohmic behavior?

In Joule heating, if voltage is doubled and resistance is halved, the power dissipated becomes:

A wire of length L and cross-sectional area A has resistance R. If the wire is stretched to 1.5 times its original length without change in volume, what will be its new resistance?

A heating element rated 1000W, 220V is connected to a 110V supply. The heat produced becomes:

An electron enters a region of uniform magnetic field with velocity v perpendicular to the field. If the magnetic field strength is B, the radius of curvature is:

Two parallel wires carrying currents I₁ and I₂ in opposite directions are separated by distance d. The force between them is: