Chemistry ยท Science General

States of Matter

2,382 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

When an object cools down the molecules

  1. get farther apart from each other and go faster

  2. get closer together and go faster

  3. get farther apart and go slower

  4. get closer together and go slower
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As temperature decreases, the kinetic energy of molecules decreases, causing them to move more slowly. Consequently, they occupy less space and move closer together.

Multiple choice

"Sugar Pot" showed us

  1. that sometimes experiments don't work as planned

  2. that sugar does not dissolve

  3. that sugar can be dissolved into any liquid

  4. that sugar doesn't have surface tension
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Science experiments often serve to demonstrate that variables affect outcomes, and sometimes results do not align with initial expectations. This is a fundamental lesson in the scientific method.

Multiple choice

"Juicy" showed us

  1. that adding heat makes an object freeze

  2. that adding or removing heat can change the state of an object

  3. that heat doesn't affect objects

  4. that sugar does not freeze
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Adding heat increases molecular motion, which can cause a solid to melt into a liquid or a liquid to evaporate into a gas. Removing heat causes the reverse process.

Multiple choice

The melting point of an object is

  1. the temperature at which a substance changes from a solid to a liquid

  2. the temperature at which a substance changes from a liquid to a solid

  3. the temperature at which a substance changes from a gas to plasma

  4. the temperature at which a substance changes from a plasma to a solid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The melting point is defined as the specific temperature at which a substance transitions from a solid state to a liquid state.

Multiple choice

The 4 states of matter we have talked about in class are

  1. solid, liquid, gas, phases

  2. solid, semi-solid, liquid, gas

  3. solid, liquid, gas, plasma

  4. there are only three states of matter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The four fundamental states of matter commonly taught in science are solid, liquid, gas, and plasma.

Multiple choice

Addition of non-volatile solute in water results in:

  1. an increase in melting point of the liquid

  2. a decrease in the boiling point of the liquid.

  3. a decrease in the vapour pressure of the liquid

  4. no change in the boiling point of the liquid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adding a non-volatile solute lowers the vapor pressure of the solvent because the solute particles occupy space at the surface, reducing the rate of evaporation.

Multiple choice

What state of matter is Petroleum?

  1. Solid

  2. Liquid

  3. Gas

  4. plasma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Petroleum in its natural, unrefined state is a viscous liquid found in underground reservoirs. It is not a solid, gas, or plasma under standard extraction conditions.

Multiple choice

What is particulate matter?

  1. a mixture of solid and liquid particles in the air

  2. specific forms of matter

  3. an odorless gas

  4. only water suspended in the air
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Particulate matter (PM) refers to a complex mixture of extremely small particles and liquid droplets suspended in the air, including dust, dirt, soot, and smoke.

Multiple choice

An electrolyte is a

  1. metal

  2. a liquid that conducts current

  3. non-metal

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water.

Multiple choice

Freezing, melting, and boiling are examples of a...

  1. Chemical reactions

  2. Solidiohypermorphology

  3. Physical reactions

  4. Phase changes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Freezing, melting, and boiling are changes in the state of matter, not changes in chemical composition. These are classified as physical changes or phase changes.

Multiple choice

When a substance cools down it has...

  1. No kinetic energy

  2. Less molecules

  3. More kinetic energy

  4. Less kinetic energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kinetic energy is the energy of motion. As a substance cools, its particles move more slowly, resulting in less kinetic energy.

Multiple choice

This state of matter has no definite shape or volume.

  1. Solid

  2. Gas

  3. Liquid

  4. What is definite?
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gases have particles that are far apart and move freely in all directions, allowing them to expand to fill any container, meaning they have neither a definite shape nor a definite volume.