Chapter 1 PHYSICAL SCIENCE : Matter in Our Surroundings — Online MCQ Test
SCIENCE · CLASS 9th · Andhra State Board
Practice Chapter 1 PHYSICAL SCIENCE : 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 PHYSICAL SCIENCE : Matter in Our Surroundings — Important Questions & Answers
What is the SI unit of temperature?
- A. Celsius
- B. Kelvin
- C. Fahrenheit
- D. Pascal
Answer: B. Kelvin
The SI unit of temperature is Kelvin, where 0 degrees Celsius equals 273.15 Kelvin.
The SI unit of temperature is Kelvin, where 0 degrees Celsius equals 273.15 Kelvin.
Which of the following is NOT a state of matter?
- A. Solid
- B. Liquid
- C. Gas
- D. Vacuum
Answer: D. Vacuum
Matter is anything that has mass and occupies space; vacuum is the absence of matter.
Matter is anything that has mass and occupies space; vacuum is the absence of matter.
Which factor decreases the rate of evaporation?
- A. Increase in surface area
- B. Increase in humidity
- C. Increase in temperature
- D. Increase in wind speed
Answer: B. Increase in humidity
Increased humidity means more water vapor is already in the air, which slows down the rate of evaporation.
Increased humidity means more water vapor is already in the air, which slows down the rate of evaporation.
During the conversion of ice to water, the temperature remains constant because:
- A. Heat is lost to the surroundings
- B. Heat is used to break intermolecular forces
- C. No energy is supplied
- D. The process is exothermic
Answer: B. Heat is used to break intermolecular forces
The supplied heat is consumed as latent heat to overcome the forces of attraction between particles.
The supplied heat is consumed as latent heat to overcome the forces of attraction between particles.
Consider a substance 'X' that sublimes. If you place it in a closed container, what happens?
- A. It turns into liquid
- B. It remains solid
- C. It reaches a dynamic equilibrium between solid and gas
- D. It disappears completely
Answer: C. It reaches a dynamic equilibrium between solid and gas
In a closed system, the vapor molecules will return to the solid phase as fast as they escape, reaching equilibrium.
In a closed system, the vapor molecules will return to the solid phase as fast as they escape, reaching equilibrium.