Last updated on August 30th, 2023 at 01:45 am
Class 9 Matter in our Surroundings MCQ
According to ancient Indian philosophers, what were the five basic elements that made up everything?
- a) Air, earth, fire, sky, and water
- b) Metal, wood, water, fire, and earth
- c) Oxygen, carbon, hydrogen, nitrogen, and sulfur
- d) Gold, silver, copper, iron, and zinc
Answer: a) Air, earth, fire, sky, and water
What are the two characteristics that all things in the universe possess?
- a) Mass and weight
- b) Volume and weight
- c) Mass and density
- d) Mass and volume
Answer: d) Mass and volume
What happens to the kinetic energy of particles as the temperature increases?
- a) It decreases
- b) It remains constant
- c) It fluctuates
- d) It increases
Answer: d) It increases
What is diffusion?
- a) The movement of particles in a straight line
- b) The separation of particles in a substance
- c) The intermixing of particles of different types of matter
- d) The transformation of matter from solid to gas
Answer: c) The intermixing of particles of different types of matter
What effect does heating have on the speed of diffusion?
- a) It slows down diffusion
- b) It has no effect on diffusion
- c) It stops diffusion completely
- d) It increases the speed of diffusion
Answer: d) It increases the speed of diffusion
Which factor determines the rate of diffusion?
- a) Temperature
- b) Volume
- c) Mass
- d) Density
Answer: a) Temperature
What is the main cause of diffusion?
- a) Gravity
- b) Chemical reactions
- c) Particle size
- d) Random motion of particles
Answer: d) Random motion of particles
What happens to the kinetic energy of particles in a solid as the temperature increases?
- a) It decreases
- b) It remains constant
- c) It fluctuates
- d) It increases
Answer: d) It increases
What effect does an increase in kinetic energy have on the particles in a solid?
- a) They move slower
- b) They vibrate more slowly
- c) They leave their fixed positions and move more freely
- d) They become tightly packed
Answer: c) They leave their fixed positions and move more freely
What is the minimum temperature at which a solid melts to become a liquid called?
- a) Boiling point
- b) Freezing point
- c) Melting point
- d) Condensation point
Answer: c) Melting point
What causes a solid to melt and become a liquid?
- a) Decrease in temperature
- b) Increase in pressure
- c) Increase in kinetic energy of particles
- d) Decrease in volume
Answer: c) Increase in kinetic energy of particles
What happens to the temperature of a system during the process of melting?
- a) It decreases
- b) It remains constant
- c) It fluctuates
- d) It increases
Answer: b) It remains constant
Where does the heat energy go when a solid melts and its temperature remains constant?
- a) It is released into the surroundings
- b) It is converted into kinetic energy of the particles
- c) It is used to overcome the forces of attraction between the particles
- d) It is lost and cannot be accounted for
Answer: c) It is used to overcome the forces of attraction between the particles
What is the term used to describe the heat energy absorbed during the process of melting without causing a rise in temperature?
- a) Hidden heat
- b) Sensible heat
- c) Latent heat
- d) Thermal energy
Answer: c) Latent heat
What does the latent heat of fusion represent?
- a) The amount of heat energy required to change the state of a substance from solid to gas
- b) The amount of heat energy required to change the state of a substance from liquid to gas
- c) The amount of heat energy required to change 1 kg of a solid into a liquid at atmospheric pressure at its melting point
- d) The amount of heat energy required to change the state of a substance from gas to solid
Answer: c) The amount of heat energy required to change 1 kg of a solid into a liquid at atmospheric pressure at its melting point
What happens to the particles of water when heat energy is supplied to it?
- a) They slow down
- b) They stop moving
- c) They start moving faster
- d) They change their shape
Answer: c) They start moving faster
At what point do the particles of a liquid have enough energy to break free from the forces of attraction and change into a gas?
- a) Freezing point
- b) Melting point
- c) Boiling point
- d) Condensation point
Answer: c) Boiling point
What is the temperature at which a liquid starts boiling at atmospheric pressure called?
- a) Melting point
- b) Freezing point
- c) Boiling point
- d) Condensation point
Answer: c) Boiling point
What are substances called that change directly from a solid state to a gaseous state without going through the liquid state?
- a) Volatile substances
- b) Non-volatile substances
- c) Sublimation substances
- d) Fusion substances
Answer: c) Sublimation substances
At a given temperature, what is the state of motion of particles in any gas, liquid, or solid?
- a) They are at rest
- b) They move in a straight line
- c) They vibrate in fixed positions
- d) They are always moving
Answer: d) They are always moving
What is the process called when a liquid changes into vapor at any temperature below its boiling point?
- a) Condensation
- b) Sublimation
- c) Evaporation
- d) Fusion
Answer: c) Evaporation
Does evaporation occur only at the boiling point of a liquid?
- a) Yes, evaporation can only occur at the boiling point.
- b) No, evaporation can occur at any temperature.
- c) Evaporation occurs only in gases, not in liquids.
- d) Evaporation is not a natural process.
Answer: b) No, evaporation can occur at any temperature.
Which factor has the greatest influence on the rate of evaporation?
- a) Surface area
- b) Temperature
- c) Humidity
- d) Wind speed
Answer: b) Temperature
What happens when acetone (nail polish remover) is poured on the palm?
- a) The particles gain energy from the palm and evaporate, causing the palm to feel cool.
- b) The palm absorbs energy from the acetone, causing the palm to feel warm.
- c) The acetone absorbs energy from the surroundings, causing the palm to feel cool.
- d) The particles gain energy from the surroundings and condense on the palm, causing the palm to feel cool.
Answer: a) The particles gain energy from the palm and evaporate, causing the palm to feel cool.
Why do people sprinkle water on the roof or open ground after a hot sunny day?
- a) To conserve water
- b) To attract birds
- c) To increase humidity in the surroundings
- d) To take advantage of the cooling effect of evaporation due to the high latent heat of vaporization of water
Answer: d) To take advantage of the cooling effect of evaporation due to the high latent heat of vaporization of water
Why should we wear cotton clothes in summer?
- a) Cotton clothes are fashionable and trendy.
- b) Cotton clothes help in conserving water.
- c) Cotton clothes absorb sweat and facilitate evaporation, keeping the body cool.
- d) Cotton clothes prevent evaporation and retain heat.
Answer: c) Cotton clothes absorb sweat and facilitate evaporation, keeping the body cool.
Which state of matter has the maximum forces of attraction between particles?
- a) Solid
- b) Liquid
- c) Gas
- d) Plasma
Answer: a) Solid
In which state of matter are the spaces between particles and kinetic energy maximum?
- a) Solid
- b) Liquid
- c) Gas
- d) Plasma
Answer: c) Gas
What is the process called when a solid changes directly into a gas without going through the liquid state?
- a) Melting
- b) Boiling
- c) Sublimation
- d) Evaporation
Answer: c) Sublimation
What is the process called when a gas changes directly into a solid without going through the liquid state?
- a) Melting
- b) Boiling
- c) Sublimation
- d) Deposition
Answer: d) Deposition
What is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point called?
- a) Latent heat of fusion
- b) Latent heat of vaporization
- c) Specific heat capacity
- d) Heat of combustion
Answer: b) Latent heat of vaporization
What is the heat energy required to change 1 kg of solid into liquid at its melting point called?
- a) Latent heat of fusion
- b) Latent heat of vaporization
- c) Specific heat capacity
- d) Heat of combustion
Answer: a) Latent heat of fusion
