HSC Science Class 11 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

If the Earth has no tilt, what happens to the seasons of the Earth?

An unknown planet orbits the Sun with a distance twice the semi-major axis distance of the Earth’s orbit. If the Earth’s time period is T₁, what is the time period of this unknown planet?

Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual gravitational attraction. Calculate the speed of each particle.

A small sphere of radius 2 cm falls from rest in a viscous liquid. Heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to

With an increase in temperature, the viscosity of liquid and gas, respectively will __________.

In a horizontal pipe of non-uniform cross-section, water flows with a velocity of 1 ms⁻¹ at a point where the diameter of the pipe is 20 cm. The velocity of water (1.5 ms⁻¹) at a point where the diameter of the pipe is (in cm)

Define the coefficient of viscosity of a liquid.

Distinguish between streamlined flow and turbulent flow.

What is Reynold’s number? Give its significance.

Define terminal velocity.

Write down the expression for Stoke’s force and explain the symbols involved in it.

Two streamlines cannot cross each other. Why?

Derive the expression for the terminal velocity of a sphere moving in a high viscous fluid using stokes force.

Derive Poiseuille’s formula for the volume of a liquid flowing per second through a pipe under streamlined flow.

A block of Ag of mass x kg hanging from a string is immersed in a liquid of relative density 0.72. If the relative density of Ag is 10 and tension in the string is 37.12 N then compute the mass of Ag block.

Why two holes are made to empty an oil tin?

An ideal gas passes from one equilibrium state (P₁, V₁, T₁, N) to another equilibrium state (2P₁, 3V₁, T₂, N). Then

A hot cup of coffee is kept on the table. After some time it attains a thermal equilibrium with the surroundings. By considering the air molecules in the room as a thermodynamic system, which of the following is true

Identify the state variables given here?

What is a thermodynamic system? Give examples.