Physics Mock Te...

Emission of an alpha particle leads to a:

Optical communication using fibers is performed in the frequency range of:

The number of electrons contained in 1 coulomb of charge is

According to Huygens' principle secondary wavelets ___________.

The magnetic flux through a 50-turn coil increases at the rate of 0.05 Wb/s. What is the induced emf between the ends of the coil?

The resistance of the bulb filament is 100 Ω at a temperature of 100 °C, its temperature co-efficient of resistance be 0.005 per °C. its resistance will become 200 Ω at a temperature.

In a coil current changes from 2A to 4A in 0.05 second. If the average induced e.m.f. is 8 volt, then coefficient of self inductance is:

The angular frequency of the charged particle in a cyclotron is

Objects at different distances are seen by the eye. In this process which one of the following remains constant?

Two current carrying long wires are placed parallel to each other and separated by a distance d. If the force on the segment of the wires is F, then the force F is related to d as:

When unpolarised light of intensity I is incident on a system of two polariser A followed by B, the intensity of emergent light is I/8. Find the angle between the polarisers A and B.

When a magnet is moved towards a coil, the induced e.m.f. in a coil is independent of the:

An electromagnet is

In a Young's double slit experiment, the intensity at the central maximum is I₀. The intensity at a distance β/4 from the central maximum is (β is fringe width)

Three charges +2q, +q, and Q are placed as shown in the figure. For the net force on +q to be zero, the charge on Q must be

Which of the following statements is NOT true regarding the infrared radiation?

Out of the following particles moving with the same velocity, _________ has the longest wavelength.

A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1·5. The focal length of the lens is:

A potential difference 'V' is applied across a conducting wire of diameter 'd' and length 'L'. When the diameter is doubled, the drift velocity-

Total internal reflection is possible when light travels from

The intrinsic semiconductor becomes an insulator at:

Which one of the following sets of properties are relevant for an electrical fuse wire needed for normal applications?

A typical cell develops a voltage of 0.5-1 V and can produce about ______ of electricity when exposed to the Sun.

Which among the following is an electromagnetic wave ?

Which of the following is not correct about the Biot-Savart’s law?

A charge of magnitude Q is placed at a distance \(\dfrac{R}{3}\) from the center of a spherical shell of radius R, uniformly charged to the charge density σ. The electrostatic force on Q is: 

Electric field strength due to a dipole of moment p at a distant point r along the axis of the dipole is:

The masses of two particles having same kinetic energy are in the ratio of 2 ∶ 1. Their de Broglie wavelengths are in the ratio

If the permittivity of the medium is ϵ then the dielectric constant of the medium is:

A horizontal metal wire is carrying an electric current from the north to the south. Using a uniform magnetic field, it is to be prevented from falling under gravity. The direction of this magnetic field should be towards the_______

When the transistor is used in the cut-off or saturation state, it acts as?

The electric field intensity at a point due to point charge of 25 × 10^-3 µC is 100 N/C. Calculate the electric potential at that point.

Find the equivalent capacitance between PQ:

Which of the following process is used for the retrieval of information from the carrier wave at the receiver?

The wavelength of the incident photons for a photoelectric emission process is increased then the photoelectric current will-

Three similar capacitors of capacitance 4 μF each are connected together in which of the following manner that the equivalent capacitance is equal to 6 μ F?

The direction of current in the circular current loop is in anticlockwise direction. Then the top face of the coil will behave as

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:

The ratio of magnetic field due to a bar magnet on the axis and on the equator is-

⁸⁶Kr₃₆ and ⁸⁶Sr₃₈ are examples of?

Meter bridge can be used to find resistance of 

Which of the following electromagnetic waves has the highest wavelength?

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is

A magnetic dipole is freely suspended in a constant magnetic field of strength B. How much torque will be acted on the dipole if it is placed in such a way that the angle between plane of dipole and magnetic field is 0°?

The coil of the inductor element of 0.5 H is connected to an alternating source of frequency 50 Hz and its impedance will be -

The quality factor 'Q' equal to _________ and it is an indicator of the sharpness of the resonance in a RLC circuit.

Two lights waves having intensities in the ratio of 9 : 4, produce interference. Then the ratio of maximum to minimum intensities in the resulting interference pattern will be

The focal length of a concave mirror is f in air. Its focal length in water (retractive index 4/3) will be 

In a A.C. circuit V = 100 sin ωt V and \(I=100 \sin \left(100t + \dfrac{\pi}{3}\right) A\), then average power loss will be:

Which of the following is the correct sequence of electromagnetic waves arranged in their increasing order of wavelengths?