Physics Mock Te...

Rain drops are spherical in shape because of - 

In nuclear reaction \({_{90}^{237}Th} \longrightarrow {_{91}^{237}Pa} + X\) : Here particle X is

Junction transistors are of bipolar type because ________

The process of superimposing signal frequency ( i.e. audio wave) on the carrier wave is known as 

The mutual inductance between two coils is 1.25 henry. If the current in the primary coil changes at the rate of 80 amperes/second, then induced e.m.f. in the secondary coil is 

Find value of R in the following circuit diagram. 

The function of LC tuned circuit used in a receiver is used –

An observer looks at a tree of height 15 m. with a telescope of magnifying power 10. To him the tree appears

The force acting between two protons in a nucleus is:

Which waves are produced by using a magnetron valve?

Two long wires A and B are placed parallel to each other. If the ratio of current in the wire A to wire B is 1 : 2, then the ratio of the force per unit length on wire A to wire B is:

A charged conductor is placed in an external electric field. The electric field inside the conductor is

Consider a beam of light is incident on a glass slap of refractive index 1.54 is reflected from the surface with an angle of incidence 33°. Now if the reflected ray is passed through a polaroid as shown below, in such case which of the following statement is correct?

(Given tan 57° = 1.54)

A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an upright image of the object coincident with it -

The magnetic flux linked with a coil in weber is given by the equation ϕ = 6t² + 3t + 2. Then the magnitude of induced emf in the coil at t = 3 sec will be:

In deriving DC equivalent circuit for an amplifier circuit we open circuit _____

In Binary Algebra, A + B can be implemented by:

Arrange metal, non- metal and semiconductor on the basis of resistance?

For the arrangement of capacitors as shown in the circuit, the effective capacitance between the points A and B is (capacitance of each capacitor is 4 μF)

The magnetic moment (m) of a current loop = _________. ('I' is the current in the loop and 'A' is the area of the rectangular loop)

The core of a transformer is laminated to:

The center of curvature of a small aperture concave mirror is 20 cm. If the required magnification of the image is 3 times the object and the image should be straight, then where the object should be kept ahead of the mirror?

Which of the following option gives the correct formula for energy stored in a capacitor?

In total internal reflection when the angle of inclination is equal to the critical angle for the pair of media in contact, what will be the angle of reflection?

With rise of temperature the coefficient of electrical resistance

AC, voltage 100 V, 50 Hz is applied to the ends of a choke of L = 2 Henry. What current will flow through it (in amperes) ?

The electric flux from a cube of side ‘a’ is ‘Φ’. What will be its value if the side of the cube is made ‘2a’ and the charge enclosed is made half?

Which of the following obeys inverse square law?

The value of equivalent resistance between the points X and Y in the given circuit is

The magnitude of the two charges are 6μC and -3μC and the distance between them is 9 cm. Then the force between the two charges will be:

A current is flowing in a long straight conductor; the magnetic field of intensity is 0.5 × 10^-4 T at 0.4 m from the conductor. Then find the current in the conductor and the magnetic field intensity at 1 m from the conductor.

The quantity of a charge that will be transferred by a current flow of 20 A over 1 hour 30 minutes period is

The decreasing order of band gap energy is:

In a series LCR circuit, the rms voltage across R, L and C is 10 V each. The rms value of applied emf is

Which of the following gates are called universal gates?

Which of the following is the best source of light that consumes the least amount of energy?

During electromagnetic induction, the direction of the induced current is given by

The ratio of potential difference across the terminals of a conductor to the current flowing through it is the:

Unpolarized light of intensity I passes through polaroid P₁ and then through polaroid P₂ kept at an angle θ with P₁. The intensity of final wave is 

The diamagnetic susceptibility of a diamagnetic material is:

What happens to the angular width of central fringe of a single slit diffraction if the slit width is doubled?

Which metal is used to connect solar cell to solar panels?

In the voltage regulator shown in the figure, the load current can vary from 100 mA to 500 mA. Assuming that the Zener diode is ideal (i.e. The Zener knee current is negligibly small and Zener resistance is Zero in the breakdown region), the value of R is

The angle of dip at a point is 30° and the magnetic field of earth is 16 T. find the vertical component of earth’s magnetic field at that point.

The correct representation of de-Broglie wavelength λ of matter is

A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight 40 days earlier?

__________ principle says that each point of the wavefront is the source of a secondary disturbance and the wavelets emanating from these points spread out in all directions with the speed of the wave.

The best material to make permanent magnets is

Find the angular frequency of the oscillation for the circuit shown in the figure:

For a system of two separately placed coaxial lenses having the focal lengths f₁ and f₂ and equal deflection ability to be achromatic, separation must be