Physics Test - ...

Directions: The following question has four choices, out of which one or more can be correct.

The coordinates of a particle moving in a plane are given by:

x(t) = a cos (pt) and y(t) = b sin (pt), where a, b (< a) and p are positive constants of appropriate dimensions.

Which of the following statements is/are correct ?

Directions: Mark the correct statements.

Directions: The following question has four choices, out of which ONE or MORE can be correct.

Two blocks A and B, each of mass m, are connected by a massless spring of natural length L and spring constant k. The blocks are initially resting on a smooth horizontal floor with the spring at its natural length, as shown in the figure. A third identical block C, also of mass m, moves on the floor with a speed v along the line joining A and B, and collides elastically with A. Then,

In YDSE, the source S is not symmetrically placed from the slits S1 and S2 (in figure). 


If the separation between slits and screen is D (d < < D), then

Directions: The following question has four choices, out of which ONE or MORE can be correct.

A simple pendulum of length L and mass (bob) M is oscillating in a plane about a vertical line between angular limits -Φ and +Φ. For an angular displacement  (θ|θ| <Φ ), the tension in the string and the velocity of the bob are T and v, respectively. The relation(s) that hold(s) good under the above conditions is/are:

Consider a flat car of mass m0 on a smooth horizontal plane, that starts moving to right under action of constant horizontal force F, which starts acting at t = 0. At the same instant, sand starts spilling on the flat car from moving hopper as shown in the given figure. The velocity of hopper is constant and is equal to v0 and is acting in direction apposite to F. The velocity of loading is constant and is equal to μ kg/s. Which of the following statements based on the above information is/are correct?

A stepped cylinder, with thread wound around smaller diametre, is released from rest and the cylinder moves down. Then,

For Fresnel type of diffraction, the wave front required is:

The first law of thermodynamics represents conservation of:

Comets move around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet’s velocity in general. Yet the work done by the gravitational force over every orbit of the comet is zero. Why?