Physics questions
20027 published questions with worked solutions.
- To find the distance d over which a signal can be seen clearly in foggy conditions, a railways engineer uses dimensional analysis...
- A galvanometer gives full scale deflection with 0.006 A current. By connecting it to a 4990 Ω resistance, it can be converted...
- Parallel rays of light of intensity I = 912 W m⁻² are incident on a spherical black body kept in surroundings of temperature 300...
- A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons...
- If _ Cu is the wavelength of K_ X-ray line of copper (atomic number 29) and _ Mo is the wavelength of the K_ X-ray line of...
- A planet of radius R = 1 10 (radius of Earth) has the same mass density as Earth. Scientists dig a well of depth R 5 on it and...
- A bullet is fired vertically upwards with velocity v from the surface of a spherical planet. When it reaches its maximum height,...
- Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 10^4 times the power...
- A nuclear power plant supplying electrical power to a village uses a radioactive material of half life T years as the fuel. The...
- Consider a Vernier callipers in which each 1 cm on the main scale is divided into 8 equal divisions and a screw gauge with 100...
- Planck's constant h, speed of light c and gravitational constant G are used to form a unit of length L and a unit of mass M. Then...
- A container of fixed volume has a mixture of one mole of hydrogen and one mole of helium in equilibrium at temperature T....
- The energy of a system as a function of time t is given as E(t)=A^2 (- t), where =0.2 s ^ -1 . The measurement of A has an error...
- The densities of two solid spheres A and B of the same radii R vary with radial distance r as _A(r)=k ( r R ) and _B(r)=k ( r R...
- Four harmonic waves of equal frequencies and equal intensities I_0 have phase angles 0, /3, 2 /3 and . When they are superposed,...
- For a radioactive material, its activity A and rate of change of its activity R are defined as A=- dN dt and R=- dA dt , where...
- In terms of potential difference V, electric current I, permittivity _0, permeability _0 and speed of light c, the dimensionally...
- A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the...
- A fission reaction is given by ^ 236 _ 92 U ^ 140 _ 54 Xe + ^ 94 _ 38 Sr +x+y, where x and y are two particles. Considering ^ 236...
- In a historical experiment to determine Planck's constant, a metal surface was irradiated with light of different wavelengths....