HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions

What is capillarity?

Obtain an expression for the surface tension of a liquid by the capillary rise method.

A capillary of diameter d mm is dipped in water such that the water rises to a height of 30 mm. If the radius of the capillary is made `(2/3)` of its previous value, then compute the height up to which water will rise in the new capillary?

A spherical soap bubble A of radius 2 cm is formed inside another bubble B of radius 4 cm. Show that the radius of a single soap bubble which maintains the same pressure difference as inside the smaller and outside the larger soap bubble is lesser than the radius of both soap bubbles A and B.

Why coffee runs up into a sugar lump (a small cube of sugar) when one corner of the sugar lump is held in the liquid?

Deduce Charles’ law based on kinetic theory.

Deduce Boyle’s law based on kinetic theory.

Deduce Avogadro’s law based on kinetic theory.

A sound wave whose frequency is 5000 Hz travels in air and then hits the water surface. The ratio of its wavelengths in water and air is ______.

What is meant by an echo? Explain.

Write short notes on reflection of sound waves from plane and curved surfaces.

Discuss in detail the energy in simple harmonic motion.

Show that for a particle executing simple harmonic motion.

1. the average value of kinetic energy is equal to the average value of potential energy.
2. average potential energy = average kinetic energy = `1/2` (total energy)

Hint: average kinetic energy = <kinetic energy> = `1/"T" int_0^"T" ("Kinetic energy") "dt"` and

average potential energy = <potential energy> = `1/"T" int_0^"T" ("Potential energy") "dt"`

Write a note on the triangulation method and radar method to measure larger distances.

An object of mass m begins to move on the plane inclined at an angle θ. The coefficient of static friction of inclined surfaces is µ_s. The maximum static friction experienced by the mass is ______

Explain various types of friction.

Suggest a few methods to reduce friction.

State the empirical laws of static and kinetic friction.

A long stick rests on the surface. A person standing 10 m away from the stick. With what minimum speed an object of mass 0.5 kg should he has thrown so that it hits the stick. (Assume the coefficient of kinetic friction is 0.7).

People often say “For every action, there is an equivalent opposite reaction”. Here they meant ‘action of a human’. Is it correct to apply Newton’s third law to human actions? What is mean by ‘action’ in Newton's third law? Give your arguments based on Newton’s laws.