A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is at a distance of 60 cm from the mirror, its velocity is 9 cm/ sec. what is the velocity of the image at that instant?

A diminished virtual image can be formed only in ______________.

A ray of light is incident normally on a lane mirror. The angle of reflection will be _____________.

Muscle wires can contract by _________ when electric current is passed through them.

The cause of potential barrier in a p-n diode is ________________.

______ theory explains photo electric effect.

When the momentum of a particle increases the de Broglie wavelength is ______________.

The radio waves of frequency 30 MHz to 300 MHz belong to _______________.

Stopping potential of emitted photo electrons is given by (where ф = hv₀) _____________.

The behaviour of Ge as semi-conductor is due to width of ___________.

The ground-state energy of hydrogen atom is ____________ eV

An oil drop carrying a charge q has a mass of m kg. It is falling freely in the air with terminal speed v. The electric field required to make the drop move upwards with the same speed is ______________.

________ radiations are used to study atomic structure.

A red flower seen in the light of mercury vapour lamp through a green filter will appear ________________.

The electric and magnetic field of an EM wave are _____________.

Torque acting on a coil is maximum when the coil is ______

The elements having Thomson positive effect are ________

An α-particle enters a magnetic field of 1T with a velocity 10⁶ m/s in a direction perpendicular to the field. The force on α-particle is _____________________.

The angular momentum of an electron revolving in second order (n = 2) is _________________.

In a tangent galvanometer a current 1A, produces deflection of 30° the current required to produce a deflection of 60° is ______________________.

A 110 W, 220 V bulb draws a current _______________.

Graph of force per unit length between long parallel current-carrying conductors, and the distance between them is ______________.

Flux loss can be minimized using ________ core.

The most suitable metal for permanent magnet is ______________.

In a carbon resistor, the third ring represents___________

The magnitude of the induced emf in a conductor depends on the _______________.

Thermo electric generators are used in power plants to convert_________ into electricity.

Which material is having a small value of temperature coefficient of resistance?

A bird sitting on an insulated wire carrying a current feels quite safe because ____________.

Two charged bodies of charges +q, -3q are brought in contact and separated. The charges prossed by each body after separation.

For continuous charge distributions, _____ methods can be used.

If the specific resistance of a potentiometer wire is 10^-7 Om and current flowing through it is 0.1 amp, cross-sectional area of wire is 10^-6 m², then potential gradient will be ________________.

Two charges are kept at a distance in air what should be the relative permittivity of the medium in which the two charges should be kept at the same distance so that they experience half of the force which they experienced in air?

The force experienced by a unit charge is called ____________

The relative permittivity of water is _______.