JEE Physics - MCQ Practice Questions

A heat engine operates between two reservoirs at temperatures 500 K and 300 K. What is the maximum theoretical efficiency of this engine?

Three moles of an ideal diatomic gas are heated at constant pressure from 300 K to 600 K. Calculate the heat absorbed by the gas. (R = 8.314 J/mol·K)

A gas expands isothermally from volume V₁ to 3V₁ at temperature T. If the initial pressure is P₁, what is the work done by the gas?

Two point charges of +2 μC and -2 μC are placed 10 cm apart. What is the electric field at a point midway between them?

The electric potential due to a point charge is V = kq/r. If the charge is doubled and distance is halved, the potential becomes:

A conducting sphere of radius 10 cm carries a charge of 5 μC. The electric field at a distance of 5 cm from the center inside the conductor is:

A parallel plate capacitor has plates of area A separated by distance d. If a dielectric of constant K is inserted between the plates, the capacitance becomes:

The electric flux through a closed surface enclosing a net charge of 10 μC is:

An electric dipole with dipole moment p is placed in uniform electric field E at angle θ to the field. The torque on dipole is:

Two identical conducting spheres carry charges Q₁ and Q₂. They are brought in contact and then separated. The final charge on each sphere is:

The electric field inside a uniformly charged spherical shell of radius R and charge Q at a distance r from center (r < R) is:

A uniformly charged infinite plane sheet has surface charge density σ. What is the electric field at a distance d from the sheet?

A point charge q is enclosed by a closed surface. If the surface is deformed without changing the charge enclosed, the electric flux through the surface:

An electron is projected horizontally with velocity v into a uniform electric field E pointing downward. Its trajectory is:

A uniformly charged sphere of radius R and total charge Q has its charge density reduced by half. The electric potential at the surface becomes:

An electric dipole experiences maximum torque when placed in a uniform electric field at angle θ with respect to the field. The value of θ is:

A test charge q is moved from point A to point B in an electric field. The work done by the field is 100 J. If the same charge is moved from B to A, the work done is:

A uniformly charged infinite plane sheet has surface charge density σ. What is the electric field at a distance from the sheet?

An electric dipole with dipole moment p is placed in a non-uniform electric field. Which statement is correct?

The potential at distance r from a point charge Q is V. If the distance is doubled, the new potential is: