Chapter 1: Matter in Our Surroundings — Online MCQ Test
SCIENCE · CLASS 9th · Karnataka State Board
Practice Chapter 1: Matter in Our Surroundings with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers physical nature of matter states of matter interconversion of states evaporation factors affecting evaporation and latent heat..
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Chapter 1: Matter in Our Surroundings — Important Questions & Answers
What is matter?
- A. Anything that has mass and occupies space
- B. Anything that shines in the dark
- C. Anything that produces heat
- D. Anything that is living
Answer: A. Anything that has mass and occupies space
Matter is defined as anything that has mass and occupies space. This is the basic definition used in science.
Matter is defined as anything that has mass and occupies space. This is the basic definition used in science.
Which of the following is a characteristic of particles of matter?
- A. They are motionless
- B. They have spaces between them
- C. They are very large and visible
- D. They do not attract each other
Answer: B. They have spaces between them
Particles of matter have spaces between them. This is one of the important properties of matter.
Particles of matter have spaces between them. This is one of the important properties of matter.
Which of the following does NOT affect the rate of evaporation?
- A. Surface area
- B. Temperature
- C. Wind speed
- D. Colour of the liquid
Answer: D. Colour of the liquid
Colour of the liquid is not a standard factor affecting evaporation in this chapter. Surface area, temperature, and wind speed do affect it.
Colour of the liquid is not a standard factor affecting evaporation in this chapter. Surface area, temperature, and wind speed do affect it.
A wet cloth dries faster on a windy day because:
- A. Wind increases condensation
- B. Wind decreases the rate of evaporation
- C. Wind removes water vapour near the cloth, increasing evaporation
- D. Wind turns water into ice
Answer: C. Wind removes water vapour near the cloth, increasing evaporation
Wind carries away the water vapour near the wet surface. This allows more liquid particles to escape, so evaporation increases.
Wind carries away the water vapour near the wet surface. This allows more liquid particles to escape, so evaporation increases.
Which statement best explains latent heat of vaporisation?
- A. Heat energy needed to change solid into liquid at constant temperature
- B. Heat energy needed to change liquid into gas at constant temperature
- C. Heat energy released when a gas freezes
- D. Heat energy needed to raise the temperature of water by 1°C
Answer: B. Heat energy needed to change liquid into gas at constant temperature
Latent heat of vaporisation is the heat required to convert a liquid into vapour without any rise in temperature. The temperature remains constant during the phase change.
Latent heat of vaporisation is the heat required to convert a liquid into vapour without any rise in temperature. The temperature remains constant during the phase change.