The focal length of a convex mirror is 20 cm, its radius of the curvature will be _____________.

A plane mirror is placed at the bottom of the tank containing a liquid of refractive index J.1.P is a small object at a height h above the mirror, an observer O-vertically above P outside the liquid. See p and its image in the mirror. The apparent distance between these two will be ____________.

A plane mirror produces a magnification of ____________.

A single strand of DNA, the building block of all living things, is about _________ nanometers wide.

In television, blanking pulse is applied to _____________.

In an insulator the energy gap between the conduction band and valence band is of the order of _____________.

A NPN transistor conducts when ________________.

Einstein's photoelectric equation is an equation of a _______

______ theory explains photo electric effect.

The saturation current is proportional to the ________ of the radiation.

Semi-conductor has phosphorous as impurity then it will have ________

The new wave mechanics of particles is called _______ mechanics.

In a video signal for transmission of picture what value of bandwidth is used in communication system?

The frequency of output signal of LC oscillator circuit is 100 Hz with capacitance value 0.1μF. IF value of capacitance is taken as 0.2 μF, the frequency of output signal ______.

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

If γ is the frequency of characteristic X-ray line emitted by a target element of atomic number Z, then Moseley's law is __________________.

The ground state energy of a hydrogen atom is 13.6 eV. The energy needed to ionize H₂ atom from its second excited state ______________.

The materials used in Robotics are _____.

The variation of frequency of carrier wave with respect to the amplitude of the modulating signal is called ______.

The specific characteristic of a common emitter amplifier is _______________.

The half-life period of a radioactive element A is same as the mean life time of another radioactive element B. Initially both have the same number of atoms. Then _____.

The ratio of the wavelengths radiation emitted for the transition from n = 2 to n = 1 in Li⁺⁺, He⁺ and H is _____.

The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is _____.

One of the of Young’s double slits is covered with a glass plate as shown in figure. The position of central maximum will,_____.

A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45^o . The ray can undergo total internal reflection for the following n, ______.