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
