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Category Archives: Physics

JEE Advanced, Physics

JEE Adv 2018 Torque on Body Problem

May 24, 2018 Manish Verma Leave a comment

Consider a body of mass 1.0 kg at rest at the origin at time t = 0. A force F = alpha.t.i+beta.j is applied on the body, where alpha = 1.0 N/s and beta = 1.0 N. The torque acting on the body about the origin at time t = 1.0 s is tau. Which of the following statements is (are) true?

JEE-Adv-2018-Torque-on-Body-Problem.pdf

JEE Advanced, Physics

JEE Adv. 2018 Intensity of Light Problem

May 23, 2018 Manish Verma Leave a comment

Sunlight of intensity 1.3kW/m^2 is incident normally on a thin convex lens of focal length 20 cm. Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light, in kW/m^2, at a distance 22 cm from the lens on the other side is ___________.

JEE-Adv-2018-Intensity-of-Light-Problem.pdf

Light Intensity
JEE Advanced, Physics

JEE Adv. 2018 Particle Speed Angular Momentum Problem

May 22, 2018 Manish Verma Leave a comment

The potential energy of a particle of mass m at a distance r from a fixed point O is given by V(r) = Kr^2/2, where k is a positive constant of appropriate dimensions. This particle is moving in a circular orbit of radius R about the point O. If v is the speed of the particle and L is the magnitude of its angular momentum about O, which of the following statements is (are) true?

JEE-Adv-2018-Particle-Speed-Angular-Momentum-Problem.pdf

Circular Motion
JEE Main, Physics

JEE Main 2018 Bulk Modulus Problem

May 21, 2018 Manish Verma Leave a comment

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 massless piston of area a floats on the surface of the liquid, covering entire cross section of cylindrical container. When a mass m is placed on the surface of the piston to compress the liquid, the fractional decrement in the radius of the sphere, dr/r is:

JEE-Main-2018-Bulk-Modulus-Problem.pdf

Bulk Modulus
JEE Main, Physics

JEE Main 2018 Parallel Batteries Problem

May 20, 2018 Manish Verma Leave a comment

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 two batteries are 1 Ω and 2 Ω respectively. The voltage across the load lies between:

JEE-Main-2018-Parallel-Batteries-Problem.pdf

Parallel Batteries
JEE Main, Physics

JEE Main 2018 Concentric Metal Shells Potential Problem

May 19, 2018 Manish Verma Leave a comment

Three concentric metal shells A, B and C of respective radii a, b and c (a < b < c) have surface charge densities +sigma, -sigma and +sigma respectively. The potential of shell B is:

JEE-Main-2018-Concentric-Metal-Shells-Potential-Problem.pdf

Electric Potential
JEE Main, Physics

JEE Main 2018 Collinear Collision Problem

May 18, 2018 Manish Verma Leave a comment

In a collinear collision, a particle with an initial speed v_0 strikes a stationary particle of the same mass. If the final total kinetic energy is 50% greater than the original kinetic energy, the magnitude of the relative velocity between the two particles, after collision, is:

JEE-Main-2018-Collinear-Collision-Solution.pdf

Collision

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