CBSE Class 12 Physics Questionbank

The charge on any body is always an integral multiple of the elementary charge. This is known as:

A current of 2 A flows through a $5\ \Omega$ resistor. Find the power dissipated (in W).

A charged particle moving parallel to a uniform magnetic field experiences a force of:

Lenz's law is a direct consequence of the conservation of:

The peak value of an AC source is $10\sqrt{2}$ V. Find its rms voltage (in V).

A convex lens has focal length 25 cm. Its power is:

In Young's double-slit experiment, the slit separation d is doubled while everything else is fixed. The fringe width will:

Assertion: The photocurrent increases when the intensity of incident light is increased.

Reason: Intensity of light is proportional to the number of photons incident per second.

According to Bohr's model, the radius of the electron orbit in the first excited state ($n = 2$) of hydrogen is:

A radioactive sample has an initial mass of 8 g. Find the mass remaining (in g) after two half-lives.

Doping silicon with a trivalent impurity such as boron produces a:

When a dielectric slab of constant K is inserted fully between the plates of an isolated charged capacitor, its capacitance:

Electromagnetic waves are:

Find the work done (in J) in moving a charge of 2 C through a potential difference of 10 V.

A diamagnetic material placed in an external magnetic field is:

The Balmer series of atomic hydrogen lies in which region of the electromagnetic spectrum?