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

N tuning forks are arranged in order of increasing frequency and any two successive tuning forks give n beats per second when sounded together. If the last fork gives double the frequency of the first (called as octave), Show that the frequency of the first tuning fork is f = (N – 1)n.

A sound source and listener are both stationary and a strong wind is blowing. Is there a Doppler effect?

How do animals sense impending danger of hurricane?

If the temperature and pressure of a gas is doubled the mean free path of the gas molecules ____________.

Define mean free path and write down its expression.

List the factors affecting the mean free path.

What is the reason for the Brownian motion?

Derive the expression for the mean free path of the gas.

Calculate the mean free path of air molecules at STP. The diameter of N₂ and O₂ is about 3 × 10⁻¹⁰ m

Describe the Brownian motion.

A living organism is differentiated from a nonliving structure based on ______.

Who coined the term biodiversity?

Why elephants and other wild animals are entering into human living area?

What is the difference between a Zoo and wild life sanctuary?

The symmetry exhibited in cnidarians is ______.

Which of the following animals has a true coelom?

In Pheretima locomotion occurs with the help of ______.

Which of the following have the highest number of species in nature? 

Which of the following is a crustacean?

Lateral line sense organs occur in ______.