A screw gauge gives the following reading when used to measure the diameter of a wire.
Main scale reading : 0 mm
Circular scale reading : 52 divisions

Given that 1 mm on main scale corresponds to 100 divisions of the circular scale.

What will be the diameter of wire from the above data?

Anonymous User Physics 15 May, 2020 1 Answer 67 views

A thermally insulated vessel contains an ideal gas of molecular mass M and the ratio of specific heats  It is moving with speed v and is suddenly brought to rest. Assuming no heat is lost to the surroundings, its temperature increases by

Anonymous User Physics Thermodynamics 15 May, 2020 1 Answer 66 views

Direction: The question has a paragraph followed by two statements, Statement-1 and Statement-2. Of the given four alternatives after the statements, choose the one that describes the statements.

A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film.

Statement-1: When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of p.

Statement-2: The centre of the interference pattern is dark.

Anonymous User Physics Waves and Sound Waves 15 May, 2020 1 Answer 63 views

Two particles are executing simple harmonic motion of the same amplitude A and frequency w along the x-axis. Their mean position is separated by distance X0 (X0 > A). If the maximum separation between them is (X0 + A), the phase difference between their motion is

Anonymous User Physics Oscillation 15 May, 2020 1 Answer 60 views

Let the x–z plane be the boundary between two transparent media. Medium 1 in z ≥ 0 has a refractive index of 2 and medium with z < 0 has a refractive index of . A ray of light in medium 1 given by the vector is incident on the plane of separation. What will be the angle of refraction in medium 2? 

Anonymous User Physics Ray Optics 15 May, 2020 1 Answer 64 views

A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, what will be the angular speed of the disc? 

Anonymous User Physics Circular and Rotational Motion 15 May, 2020 1 Answer 63 views


A fully charged capacitor C with initial charge q0 is connected to a coil of self-inductance L at t = 0. What is the time at which the energy is stored equally between the electric and the magnetic fields? 

Anonymous User Physics Electromagnetic Induction & Alternating Current 15 May, 2020 1 Answer 115 views


Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance d(d < < l) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the charges approach each other with a velocity v. Then as a function of distance x between them

Anonymous User Physics Electrostatic 15 May, 2020 1 Answer 72 views

Three perfect gases at absolute temperatures T1, T2 and T3 are mixed. The masses of molecules are m1, m2 and m3 and the number of molecules are n1, n2 and n3 respectively. Assuming no loss of energy, the final temperature of the mixture is

Anonymous User Physics Thermodynamics 15 May, 2020 1 Answer 79 views


A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m s-1. The speed of the image of the second car as seen in the mirror of the first one is

Anonymous User Physics Ray Optics 15 May, 2020 1 Answer 73 views





A boat is moving due east in a region where the earth’s magnetic field is 5.0 × 10-5 N A-1m-1due north and horizontal. The boat carries a vertical aerial 2 m long. If the speed of the boat is 1.50 m s-1, what will be the magnitude of the induced emf in the wire of aerial?

Anonymous User Physics Electromagnetic Induction & Alternating Current 15 May, 2020 1 Answer 71 views



A resistor R and 2  capacitor in series is connected through a switch to 200 V direct supply. Across the capacitor is a neon bulb that lights up at 120 V. Calculate the value of R to make the bulb light up 5 s after the switch has been closed. (log102.5 = 0.4)

Anonymous User Physics Electromagnetic Induction & Alternating Current 14 May, 2020 1 Answer 56 views



A mass M, attached to a horizontal spring, executes SHM with an amplitude A1. When the mass M passes through its mean position then a smaller mass m is placed over it and both of them move together with amplitude A2

What is the ratio of ?

Anonymous User Physics Oscillation 14 May, 2020 1 Answer 63 views





The potential energy function for the force between two atoms in a diatomic molecule is approximately given by  where a and b are constants and x is the distance between the atoms. What will be D, if the dissociation energy of the molecule is 

Anonymous User Physics 12 May, 2020 1 Answer 72 views

A point P moves in a counter-clockwise direction on a circular path as shown in the figure. The movement of P is such that it sweeps out a length s = t3 + 5, where s is in meters, and t is in seconds. The radius of the path is 20 m. What will be the acceleration of P when t = 2 s?

Anonymous User Physics Circular and Rotational Motion 12 May, 2020 1 Answer 62 views

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g cm-3, the angle remains the same. If the density of the material of the sphere is 1.6 g cm-3, what is the dielectric constant of the liquid?

Anonymous User Physics Electrostatic 12 May, 2020 1 Answer 82 views

A small particle of mass m is projected at an angle  with the x-axis with an initial velocity v0 in the x-y plane as shown in the figure.

At a time  the angular momentum of the particle is

Note: are unit vectors along x, y and z-axis respectively.

Anonymous User Physics Circular and Rotational Motion 12 May, 2020 1 Answer 72 views