Physics questions
20027 published questions with worked solutions.
- A particle is moving with a uniform speed in a circular orbit of radius R in a central force inversely proportional to the n^ th...
- A solid sphere of radius r made of a soft material of bulk modulus K is surrounded by a liquid in a cylindrical container. A...
- The mass of a hydrogen molecule is 3.32 10^ -27 kg. If 10^ 23 hydrogen molecules strike, per second, a fixed wall of area 2 cm²...
- A silver atom in a solid oscillates in simple harmonic motion in some direction with a frequency of 10^ 12 /sec. What is the...
- A granite rod of 60 cm length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is...
- Three concentric metal shells A, B and C of respective radii a, b and c (a < b < c) have surface charge densities + , - and +...
- A parallel plate capacitor of capacitance 90 pF is connected to a battery of emf 20 V. If a dielectric material of dielectric...
- In an a.c. circuit, the instantaneous e.m.f. and current are given by e = 100 30t, i = 20 (30t - 4 ) In one cycle of a.c., the...
- Two batteries with e.m.f. 12 V and 13 V are connected in parallel across a load resistor of 10 Ω. The internal resistances of the...
- An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii r_e, r_p, r_...
- The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is B_1. When the...
- An EM wave from air enters a medium. The electric fields are E _1 = E_ 01 x [2 ( z c -t ) ] in air and E _2 = E_ 02 x [k(2z-ct)]...
- Unpolarized light of intensity I passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The...
- The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 µm. The slit is...
- An electron from various excited states of hydrogen atom emit radiation to come to the ground state. Let _n, _g be the de Broglie...
- It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is...
- On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their series...
- A heating element has a resistance of 100 Ω at room temperature. When it is connected to a supply of 220 V, a steady current of 2...
- Two particles of the same mass are moving in circular orbits because of force, given by f(r) = -16 r - r^3 The first particle is...
- At some instant, a radioactive sample S_1 having an activity 5 µCi has twice the number of nuclei as another sample S_2 which has...