Physics Mock Te...

The magnitude of the energy gap for an insulator is

Two point charges of +3q and -q are placed inside a cube of side x. The total electric flux through the cube is _________.

The level of atmosphere which transmits radio waves is

If the refractive index of glass is 1, find Brewster’s angle –

The ____________ Circuital Law states that, the line integral of the magnetic field around some closed loop is equal to 'μ₀' times the algebraic sum of the currents which pass through the loop. ('μ_o' is the permeability of free space)

Which of the following is not being used for long range communication? 

What is the force between two small charged spheres having charges of 2 × 10^-7 C and 3 × 10^-7 C placed 30 cm apart in the air?

The plate area of a parallel-plate capacitor is 0.01 m². The distance between the plates is 2.5 cm. If the insulating medium is air, its capacitance will be _________.

A bulb is marked with 60 W/240 V. The resistance when lighted at 240 V is -

The working of Nicol prism is based on the optical phenomenon of _____________.

Radii of curvature of a converging lens are in the ratio 1 : 2. Its focal length is 6 cm and refractive index is 1.5. Then its radii of curvature are _______ respectively.

Two-point charges of +5μC and +5μC are placed 8 cm apart in the air. Find the distance at which the resultant electric field is zero.

When a beam of ordinary light is passed through a calcite crystal, the light splits into O-ray and E-ray inside the crystal.

What is the value of the collector current of a bipolar junction transistor having a current gain (β) of 200 and the base current of 50 μA?

Same amount of charges are given to two capacitors A and B from the sources of emfs 100V and 150V, respectively, then the ratio of their capacitances is_______.

The net electric flux through a spherical surface having 10 μC charge at the centre is

In the given circuit, current through 10 Ω resistor is:

In a bi-prism experiment, the interference pattern is observed at a distance of 15 cm from the source and the wavelength of light is 400 nm. The distance between two virtual sources is 2 mm. Find the fringe width of pattern.

A coil of an area of 2 m² is placed in a magnetic field that changes from 4 wb/m² to 8 wb/m² in 2 seconds. Find the induced emf in the coil.

Half-life of a radioactive element is 30 days, then the remaining amount after 90 days:

The transistor amplifier in the following configuration is called emitter follower

In the figure with Zener diode, the currents through the series resistance and load resistance are respectively

In a RLC circuit Inductance is 20 mH and capacitance is 200 micro Farad. Find the resonance frequency of the circuit.

The maximum possible mutual inductance between the coils have self inductance L₁ = 4 H and L₂ = 16 H is ______.

Two long straight parallel conductors of length 'L', separated by a distance 'd' and each carrying a current 'I' attract each other with a force equal to
___________.

The magnification of a convex mirror is +2. If the height of the object is 10 cm, then height of the image will be-

If kinetic energy of two electrons is in the ratio of 4 : 1, find the ratio of associated de-Broglie wavelength respectively.

Which of the following device is not a part of detector system of amplitude modulated wave?

Magnetic moment of a current carrying loop can be increased by which of the following?

Arrange paramagnetic, diamagnetic, and ferromagnetic material on the order of susceptibility?

Five cells, each with an e.m.f. of 2V and internal resistance of 0.5 Ω are connected in series. The resulting battery will have

Which is the correct graph for reverse bias current through a photodiode?

²⁰⁹Bi₈₃ → ^ATi₈₁ + α particle. What is the value of 'A'?

When glass rod is rubbed with silk, the charge on silk cloth by convention 

In forward region of its characteristics, a diode appears as

Which of the following graph follows Ohm's law

Why can't we explain the photoelectric effect by the wave theory of light?

At a certain place, the horizontal component of the earth's magnetic field is √3 times the vertical component. The angle of dip at that place is

Which of the following is Incorrect regarding the laws of reflection?

Which of the following device converts non electrical signal into electrical form in a communication system?

The sky appears blue due to ________.

For a two-input logic gate, the output is "Low"  when at least one of the Input is "Low". The logic gate is:−

Which of the following is the best choice for permanent magnets?

X-rays discovered by whom?

Which colour of light will have more resolving power for a telescope?

Two masses of 1 kg and 4 kg have same Kinetic energy. What is the ratio of their momenta

The process in which the low frequency message signal is superimposed on a high frequency wave is called:

By which law, the direction of induced emf will be identified

In Huygens principle, the relation between wavefront and the ray of light is-

If P, Q, R and S represents resistances of 4 arms of the Wheatstone's bridge, then the sensitivity of Wheatstone's bridge will be maximum when