PART - 2 CH - 10 Thermal Properties of Matter — Physics STD 11 Science — Question

Which law of motion is involved in rocket propulsion?

Answer the following :
The triple-point of water is a standard fixed point in modern thermometry. Why? What is wrong in taking the melting point of ice and the boiling point of water as standard fixed points (as was originally done in the Celsius scale)?

When 200g mass placed in a cylindrical beaker of base area 'a' is removed, the vertical length comes out of water by 2cm. What is the radius of the cylinder?

At what inclination should a player throw the ball from horizontal so that the ball travels the maximum distance?

What is the efficiency of a Carnot engine operating between boiling and freezing points of water?

Two proton beams going in the same direction repel each other whereas two wires carrying currents in the same direction attract each other. Explain.

Choose the correct alternative :
(a) If the zero of potential energy is as infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy.
(b) The energy required to launch an orbiting satellite out of earth's gravitational influence is more/ less than the energy required to project a stationary object at the same height (as the satellite) out of earth's influence.

Why is the nib of a pen split?

Are all dimensionally correct equations numerically correct? Give one example.

A ball is dropped from a height of 90m on a floor. At each collision with the floor, the ball loses one tenth of its speed. Plot the speed-time graph of its motion between t = 0 to 12s.