Physics questions
20027 published questions with worked solutions.
- A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method....
- The ratio of the weights of a body on the Earth's surface to that on the surface of a planet is 9 : 4. The mass of the planet is...
- Two particles are projected from the same point with the same speed u such that they have the same range R, but different maximum...
- A particle of mass m and charge q has an initial velocity v =v_0 j . If an electric field E =E_0 i and magnetic field B =B_0 i...
- An emf of 20 V is applied at time t = 0 to a circuit containing in series 10 mH inductor and 5 resistor. The ratio of the...
- In a Young's double slit experiment, the separation between the slits is 0.15 mm. In the experiment, a source of light of...
- A box weighs 196 N on a spring balance at the north pole. Its weight recorded on the same balance if it is shifted to the equator...
- Mass per unit area of a circular disc of radius a depends on the distance r from its centre as (r) = A + Br. The moment of...
- In a building there are 15 bulbs of 45W, 15 bulbs of 100 W, 15 small fans of 10 W and 2 heaters of 1 kW. The voltage of electric...
- A stationary observer receives sound from two identical tuning forks, one of which approaches and the other one recedes with the...
- Two ideal Carnot engines operate in cascade (all heat given up by one engine is used by the other engine to produce work) between...
- The activity of a radioactive sample falls from 700 s ^ -1 to 500 s ^ -1 in 30 minutes . Its half life is close to -
- The electric field of a plane electromagnetic wave is given by – E =E_0 i + j 2 (kz+ t) At t = 0, a positively charged particle...
- An elevator in a building can carry a maximum of 10 person, with the average mass of each person being 68 kg. The mass of the...
- A planar loop of wire rotates in a uniform magnetic field. Initially, at t = 0, the plane of the loop is perpendicular to the...
- An electron (of mass m) and a photon have the same energy E in the range of a few eV. The ratio of the de-Broglie wavelength...
- An ideal fluid flows (laminar flow) through a pipe of non-uniform diameter. The maximum and minimum diameters of the pipes are...
- The dimension of B^2 2 _0 , where B is magnetic field and _0 is the magnetic permeability of vaccum, is :
- A thin lens made of glass (refractive index = 1.5) of focal length f = 16 cm is immersed in a liquid of refractive index 1.42. If...
- A mass of 10 kg is suspended by a rope of length 4m, from the ceiling, A force F is applied horizontally at the mid-point of the...