Force and Laws of Motion — Science STD 9 — Question

When the frequency of the sound is increased, the wavelength __________. (Increases, Decreases, Remains constant)

In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called _________.

An echo is simply a ______ Sound.

Gases can be liquefied by applying ________ and lowering Temperature. (Pressure, Surface tension, Volume)

The slope of a distance-time graph indicates __________ of a moving body. (Speed, Acceleration, Force)

Sublimation is the change of gaseous state directly to solid state without going through the ________ state. (Liquid, Gas, Vapour)

1 mole contains __________ atoms, molecules or ions of a substance. (Avogadro's number, Mole number, Atomic mass)

In order for the force of gravitation between two bodies to become noticeable and cause motion, one of the bodies must have an extremely large __________. (Mass, Speed, Volume)