Soaps clean surfaces on the principle based on?
viscosity
floatation
elasticity
surface tension
Correct answer is D
Since the surface tension forces become smaller as the distance between water molecules increases, the intervening soap molecules decrease the surface tension.
I only
I, II and IV
I and II only
I, II, III, and IV
Correct answer is D
- Calcium trioxocarbonate (IV) occurs abundantly in earth's crust as limestone, chalk and marble
- Eggshell is made almost entirely of calcium carbonate (CaCO3) crystals.
James Chadwick
Ernest Rutherford
J.J Thompson
John Dalton
Correct answer is A
- Sir James Chadwick, was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
- Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.
- Sir Joseph John Thomson was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered.
- John Dalton was an English chemist, physicist and meteorologist. He is best known for introducing the atomic theory into chemistry
The maximum electron in N shell is?
2
8
18
32
Correct answer is D
The N shell is the fourth orbit with 32 max number of electrons using 2n\(^2\)
Sublimation
Evaporation
Diffusion
Radiation
Correct answer is A
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.
Familiar substances that sublime readily include iodine, dry ice, menthol, and camphor.