Physics questions
20027 published questions with worked solutions.
- The intensity of the light from a bulb incident on a surface is 0.22 W/m^ 2 . The amplitude of the magnetic field in this...
- A body is performing simple harmonic with an amplitude of 10 cm. The velocity of the body was tripled by air Jet when it is at 5...
- 300 cal. of heat is given to a heat engine and it rejects 225 cal. of heat. If source temperature is 227°C, then the temperature...
- d _ 1 and d _ 2 are the impact parameters corresponding to scattering angles 60° and 90° respectively, when an particle is...
- A parallel beam of light is allowed to fall on a transparent spherical globe of diameter 30 cm and refractive index 1.5. The...
- Consider a star of mass m_2 kg revolving in a circular orbit around another star of mass m_1 kg with m_1 m_2. The heavier star...
- A positive point charge of 10^ -8 C is kept at a distance of 20 cm from the center of a neutral conducting sphere of radius 10...
- The efficiency of a Carnot engine operating with a hot reservoir kept at a temperature of 1000 K is 0.4. It extracts 150 J of...
- A hydrogen atom, initially at rest in its ground state, absorbs a photon of frequency _1 and ejects the electron with a kinetic...
- A geostationary satellite above the equator is orbiting around the earth at a fixed distance r_1 from the center of the earth. A...
- A projectile of mass 200 g is launched in a viscous medium at an angle 60° with the horizontal, with an initial velocity of 270...
- A source supplies heat to a system at the rate of 1000 W. If the system performs work at a rate of 200 W. The rate at which...
- The number of air molecules per cm^3 increased from 3 10^ 19 to 12 10^ 19 . The ratio of collision frequency of air molecules...
- The induced emf can be produced in a coil by A. moving the coil with uniform speed inside uniform magnetic field B. moving the...
- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: When a body is...
- A small block of mass 100 g is tied to a spring of spring constant 7.5 N/m and length 20 cm. The other end of spring is fixed at...
- Two resistance are given as R_1 = (10 0.5) and R_2 = (15 0.5) . The percentage error in the measurement of equivalent resistance...
- A monochromatic light wave with wavelength _1 and frequency _1 in air enters another medium. If the angle of incidence and angle...
- A small ball of mass M and density is dropped in a viscous liquid of density _0. After some time, the ball falls with a constant...
- For the plane electromagnetic wave given by E = E_0 ( t-kx) and B = B_0 ( t-kx), the ratio of average electric energy density to...