Model Paper 3 — Physics STD 11 Science — Question

Find the minimum and maximum wavelengths of sound in water that is in the audible range (20-20000Hz) for an average human ear. Speed of sound in water = 1450m/s.

The refractive index of a material changes by 0.014 as the colour of the light changes from red to violet. A rectangular slab of height 2.00cm made of this material is placed on a newspaper. When viewed normally in yellow light, the letters appear 1.32cm below the top surface of the slab. Calculate the dispersive power of the material.

Two equal drops of water are falling through air with a steady velocity v. If the drops coalesce, what will be the new steady velocity?

On what factors does the speed of transverse waves setup in a string depend?

A hydraulic automobile lift is designed to lift cars with maximum mass of 300kg. The area of cross-section of the piston carrying the load is 425cm². What maximum pressure would the smaller piston have to bear?

Can work be done by a system without changing its volume?

A block of mass 2.00kg moving at a speed of 10.0m/s accelerates at 3.00m/s² for 5.00s. Compute its final kinetic energy.

A simple pendulum of length 40cm is taken inside a deep mine. Assume for the time being that the mine is 1600km deep. Calculate the time period of the pendulum there. Radius of the earth = 6400km.

If the frequency of a tuning fork is 400Hz and the velocity of sound in air is 320m/s, find how far does the sound travel when the fork executes 30 vibrations.