Practice questions
88551 published questions with worked solutions.
- 50 W/m^2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is...
- A moving coil galvanometer has a coil with 175 turns and area 1 cm^2. It uses a torsion band of torsion constant 10^ -6 N-m/rad....
- Two coils 'P' and 'Q' are separated by some distance. When a current of 3 A flows through coil 'P' a magnetic flux of 10^ -3 Wb...
- A particle of mass 'm' is moving with speed '2v' and collides with a mass '2m' moving with speed 'v' in the same direction. After...
- A wooden block floating in a bucket of water has 4 5 of its volume submerged. When certain amount of an oil is poured into the...
- The position of a particle as a function of time t, is given by x(t) = at + bt^2 - ct^3 where a, b and c are constants. When the...
- A thin smooth rod of length L and mass M is rotating freely with angular speed _0 about an axis perpendicular to the rod and...
- Moment of inertia of a body about a given axis is 1.5 kg m^2. Initially the body is at rest. In order to produce a rotational...
- The parallel combination of two air filled parallel plate capacitors of capacitance C and nC is connected to a battery of...
- The resistance of a galvanometer is 50 ohm and the maximum current which can be passed through it is 0.002 A. What resistance...
- The position vector of a particle changes with time according to the relation r(t) = 15t^2 i + (4 - 20t^2) j. What is the...
- A massless spring (k = 800 N/m) attached with mass (500 g) is completely immersed in 1 kg of water. The spring is stretched by 2...
- Two cars A and B are moving away from each other in opposite directions. Both the cars are moving with a speed of 20 ms^ -1 with...
- Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600 nm coming from a distant object, the limit...
- The specific heats, C_P and C_V of a gas of diatomic molecules, A, are given (in units of J mol^ -1 K^ -1 ) by 29 and 22,...
- In a conductor, if the number of conduction electrons per unit volume is 8.5 10^ 28 m^ -3 and mean free time is 25 fs (femto...
- Four point charges −q, +q, +q and −q are placed on y-axis at y = −2d, y = −d, y = +d, y = +2d, respectively. The magnitude of the...
- A particle 'P' is formed due to a completely inelastic collision of particles 'x' and 'y' having de-Broglie wavelengths ' _x' and...
- A string 2.0 m long and fixed at its ends is driven by a 240 Hz vibrator. The string vibrates in its third harmonic mode. The...
- A test particle is moving in a circular orbit in the gravitational field produced by a mass density (r) = K r^2 . Identify the...