Practice questions
88551 published questions with worked solutions.
- For a plane electromagnetic wave, the magnetic field at a point x and time t is B (x,t)= [1.2 10^ -7 (0.5 10^3x+1.5 10^ 11 t) k...
- A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a...
- A circuit to verify Ohm's law uses ammeter and voltmeter in series or parallel connected correctly to the resistor. In the...
- Consider the force F on a charge 'q' due to a uniformly charged spherical shell of radius R carrying charge Q distributed...
- Given the masses of various atomic particles m_p = 1.0072u, m_n = 1.0087u, m_e = 0.000548u, m_v = 0, m_d = 2.0141u, where p ≡...
- Two identical electric point dipoles have dipole moments p_1 =p i and p_2 =-p i and are held on the x axis at distance 'a' from...
- The linear mass density of a thin rod AB of length L varies from A to B as (x)= _0 (1+ x L ), where x is the distance from A. If...
- When a particle of mass m is attached to a vertical spring of spring constant k and released, its motion is described by y(t) =...
- In a dilute gas at pressure P and temperature T, the mean time between successive collisions of a molecule varies with T as :
- A fluid is flowing through a horizontal pipe of varying cross-section, with speed v ms ^ -1 at a point where the pressure is P...
- Assuming the nitrogen molecule is moving with r.m.s. velocity at 400 K, the de-Broglie wavelength of nitrogen molecule is close...
- Particle A of mass m_1 moving with velocity ( 3 i + j ) ms ^ -1 collides with another particle B of mass m_2 which is at rest...
- A charged particle going around in a circle can be considered to be a current loop. A particle of mass m carrying charge q is...
- A square loop of side 2a and carrying current I is kept in xz plane with its centre at origin. A long wire carrying the same...
- When a car is at rest, its driver sees rain drops falling on it vertically. When driving the car with speed v, he sees that rain...
- The centre of mass of a solid hemisphere of radius 8 cm is X cm from the centre of the flat surface. Then value of x is ________ .
- In a series LR circuit, power of 400 W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit is 0.8. In...
- A Young's double-slit experiment is performed using monochromatic light of wavelength . The intensity of light at a point on the...
- The value of K_C is 64 at 800 K for the reaction N_2(g)+3H_2(g) 2NH_3(g) . The value of K_C for the following reaction is :...
- The element that can be refined by distillation is :Not in JEE Main or NEET syllabus