Work and Energy — Science STD 9 — Question

For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.

Which of the following do not exhibit Tyndall effect?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.

What are the various letters used by Bohr to represent electron shells in an atom?

Name two units of power bigger than watt.

Name any two solid substances whose mixture can be separated by sublimation.

What do you understand by the kinetic energy of a body?

Which would have a greater effect on the kinetic energy of an object: doubling the mass or doubling the velocity?

Which of the two produces ultrasonic waves: porpoise or whale?

An element has atomic number 13 and an atomic mass of 27.
How are these electrons distributed in the various energy levels?

Name the device or machines which convert:
Light energy into heat energy.