Physics questions
20027 published questions with worked solutions.
- If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the...
- Radiation, with wavelength 6561 Å falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform...
- Two particals of equal mass m have respective initial velocities u i and u ( i + j 2 ). They collide completely inelastically....
- A body A of mass m is moving in a circular orbit of radius R about a planet. Another body B of mass m 2 collides with A with a...
- A quantity f is given by f= hc^5 G where c is speed of light, G universal gravitational constant of light and h is the Planck's...
- A long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic...
- An electric dipole of moment p =(- i -3 j +2 k ) 10^ -29 C.m is at the origin (0, 0, 0). The electric field due to this dipole at...
- A particle moving with kinetic energy E has de Broglie wavelength . If energy E is added to its energy, the wavelength become /2....
- The aperture diameter of a telescope is 5 m. The separation between the moon and the earth is 4 10^5 km. With light of wavelength...
- A vessel of depth 2h is half filled with a liquid of refractive index 2 2 and the upper half with another liquid of refractive...
- Three harmonic waves having equal frequency and same intensity I_0, have phase angles, 0, 4 and - 4 respectively. When they are...
- The electric fields of two plane electromagnetic plane waves in vacuum are given by E _1=E_0 j ( t-kx) and E _2=E_0 k ( t-ky) At...
- The distance x covered by a particle in one dimensional motion varies with time t as x^2 = at^2 + 2bt + c. If the acceleration of...
- A body of mass m = 10 kg is attached to one end of a wire of length 0.3 m. The maximum angular speed (in rad s ^ -1 ) with which...
- In a fluorescent lamp choke (a small transformer) 100 V of reverse voltage is produced with the choke current changes uniformly...
- To raise the temperature of a certain mass of gas by 50ºC at a constant pressure, 160 calories of heat is required. When the same...
- The radius R of a nucleus of mass number A can be estimated by the formula R=(1.3 10^ -15 )A^ 1/3 m., It follows that the mass...
- The mass density of a planet of radius R varies with the distance r from its centre as (r)= _0 (1- r^2 R^2 ). Then the...
- Amount of solar energy received on the earth's surface per unit area per unit time is defined a solar constant. Dimension of...
- A block of mass m attached to a massless spring is performing oscillatory motion of amplitude 'A' on a frictionless horizontal...