Improvement in Food Resources — Science STD 9 — Question

The state of matter called ________ makes a fluorescent tube (or neon sign bulb) glow. (Plasma, Gas, Liquid)

Cells were discovered by Robert Hooke in ________. (1665, 1750, 1802)

When a stationary car starts suddenly, the passengers are jerked _________.

60g of carbon element are ____________ moles of carbon atoms. (5, 1, 10)

In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ______. (Law of Conservation of Mass, Law of Constant Proportion, Law of Multiple Proportions)

1 mole contains __________ atoms, molecules or ions of a substance.

Both stretched spring and compressed spring have __________ energy. (Elastic potential, Kinetic, Mechanical)

When v - t graph has negative slopes, acceleration is __________. (Zero, Positive, Negative)

The process of getting pure solid by cooling a hot saturated solution is called ________. (Crystallization, Sedimentation, Filtration)

An echo is simply a ______ Sound.