Chemistry · Science General

States of Matter

2,682 Questions

States of matter questions explore physical changes, evaporation, phase transitions, and the properties of liquids and gases. Topics cover density, cryosurgery, heavy water, and electrolytes. This foundational chemistry topic frequently appears in general science sections of SSC and railway exams.

Phase change mechanismsEvaporation and temperature effectsProperties of liquidsPhysical versus chemical changesElectrolytes and heavy water

States of Matter Questions

Multiple choice

What happens to a candle when a substance is heated on it?

  1. Wax at the outer region of the heated wick melts quickly.

  2. Wax at the inner region of the heated wick melts quickly.

  3. Wax at both the regions melts quickly.

  4. Wax at the outer regions becomes cold.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Wax at the inner regions of the heated wick melts quickly. All waxes are essentially hydrocarbons, which means they are largely composed of hydrogen (H) and carbon (C) atoms. The heat of the flame vaporizes the liquid wax (turns it into a hot gas). These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapor (H2O) and carbon dioxide (CO2). 

Multiple choice

Water is used to extinguish fire because water

  1. raises the ignition temperature of the burning substance

  2. lowers the ignition temperature of the burning substance

  3. cools the burning substance to a temperature below its ignitions temperature

  4. conducts the heat
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When water is poured over the burning substance water absorbs heat from the substance. Because of this the temperature of burning substance falls below its ignition temperature and it stops burning.

Multiple choice

Solubility of gases in water

  1. decreases with rise in temperature

  2. increases with rise in temperature

  3. remains constant with rise in pressure

  4. decreases with rise in pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solubility of gases in water decreases with rise in temperature.

Multiple choice

Solubility of gases in water

  1. decreases with rise in temperature

  2. increases with rise in temperature

  3. remains constant with rise in pressure

  4. decreases with rise in pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solubility of gases in water decreases with rise in temperature.

Multiple choice

When two or more elements join together chemically,

  1. a compound is formed

  2. a heterogeneous mixture is formed

  3. a homogeneous mixture is formed

  4. a colloid is formed
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When two or more elements join together chemically, a compound is formed. 

Multiple choice

Liquid food drinking is

  1. pinocytosis

  2. phagocytosis

  3. imbibition

  4. None of the above

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is a mechanism by which cells ingest extracellular fluid and its contents. It involves the formation of invaginations by the cell membrane. This is also called as cell drinking.

Multiple choice

Which of the following is a physical change?

  1. Glowing of an electric bulb

  2. Respiration

  3. Digestion of food

  4. Burning of wax
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glowing of an electric bulb is a physical change because when electric current is passed through the filament of a bulb, the filament starts glowing and the glow stops as soon as the current is cut off. The chemical composition of tungsten filament does not change.