Physics Mock Te...

When a transistor is used in common emitter configuration, the variation of the _____________ voltage is called the output characteristic.

The area of the plates of a parallel plate capacitor is A. If the capacitor is having a charge Q, then the force between the plates is:

Choke coil:

Which among the following is not related to the conservation of charge?

Angular momentum of an electron revolving in 2nd orbit of radius r:

A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio 8 : 1. The ratio of radii of the fragments is

All capacitors used in the diagram are identical and each is of capacitance C. Then the effective capacitance between the point A and B is_______

Which one of the following circuit elements is an active component?

According to Bohr's model, the radius of the second orbit of the helium atom is

Which of the following statement is true about de-Broglie wavelength of moving ball in cricket:

A thin spherical conducting shell has charge Q on it. The potential inside the conductor has a constant value throughout. The electric field inside the conductor is?

To a fish under water viewing obliquely a fisherman standing on the bank of a lake, the man looks

Our sky looks like red at the time of sunrise and sunset because in this position the scattering will be

An electron in a TV tube has a speed of 6 × 10⁷ m/s. What is the de Broglie wavelength associated with the electron (m = 9.11 × 10^-31 kg)?

Experimental observation in a single slit experiment show that the intensity has a central maximum at θ = 0 and other secondary maxima at θ = ______________. (where 'θ' is the angle between the central line and the line joining the midpoint of the slit of width 'a' to any point 'P' on the screen, 'λ' is the wavelength of the light and where n = ±1, ±2, ±3, ....)

Nature of electromagnetic waves is transverse. Evidence of this is given by 

The device used for converting AC to DC is called __________?

The phenomenon utilized in an optical fibre is

Which is the best device to measure e.m.f. of a cell:

Radioactive polonium ²¹⁴Po, decays by alpha emission to

Volt per ampere is also called

A particle having a charge of 15 µC is brought from infinity to a point P by doing a work of 3.0 mJ. The potential at point P is ________.

Two charges +2q and -6q are placed at a distance r from each other. Another charge Q is placed at the midpoint between the two charges such that the resultant force on the charge -6q is zero, then the charge Q will be equal to:

Light from a point source in air falls on a spherical glass surface (n = 1.5 c and radius of curvature = 10 cm). The distance of the light source from the glass surface is 50 cm. At what position the image is formed?

Potential at a point due to a point charge is V. The charge is doubled and also the distance of the point from the charge is doubled. The new potential is

Which of the following statement is correct regarding the eddy current?

The magnetic field lines:

The emitter of a transistor is ______ doped

Which waves are produced by using a magnetron valve?

The magnetic field strength of a current carrying wire at a particular distance from the axis of the wire

In an LC oscillation circuit the capacitance of the capacitor is 40 μF and the self inductance of the inductor is 100 mH. Find the natural frequency of the circuit.

In photo electric effect, the maximum initial velocity of emitted electrons depends upon

The direction of wave front of a wave with the direction of propagation of wave is:

If the series arrangement of two similar cells of emf E and internal resistance r is connected to a load of resistance R, then find the current in the load resistance.

If R1 = 2Ω, R2 = 4Ω, R3 = 6Ω, determine the electric current that flows in the circuit below.

Which of the following statements are true about image formation in a plane mirror?

A. The image is larger in size than the object.

B. The image is formed at the same distance as the object.

C. The image is laterally inverted.

D. The image is virtual

When the angle of incidence on the surface of a transparent material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is:

The drift velocity of electrons (v) in a current-carrying conductor is related to its electric field (E) as:

Which characteristic of X-ray spectra does not change when the target material is changed?

The magnetic flux threading a coil changes from 12 × 10^-3 Wb to 6.0 × 10^-3 Wb in 0.01s. Calculate the induced emf.

If a free electron is placed in the path of a plane electromagnetic wave, it will start moving

An electric current is passed through a circuit. The circuit has two wires of the same material that are connected in parallel. If the lengths and radii of the wires are in the ratio 4 : 3 and 2 : 3 respectively, then the ratio of the currents passing through the wire will be-

Which of the following statement is/are incorrect?

Which of the following produces magnetic field?

Uniformly charged spherical shell having the radius R. Electric field at a distance r (r < R) from the center?

Total internal reflection takes place when the angle of incidence is..

The image formed by a plane mirror is

What is the linear magnification m, for the image formed at the near point D, by a simple microscope equal to? (f is focal length)

An electric dipole is placed in the uniform electric field. The torque experienced by the dipole will be maximum when the angle between the dipole and the electric field is:

When a current I flows through the coil of area A of a moving coil Galvanometer a torque equal to ________ acts on it.