Chapter Exam

Chapter 1 PHYSICAL SCIENCE : Matter in Our Surroundings — Online MCQ Test

Q: What is the SI unit of temperature?

Answer: B. Kelvin — The SI unit of temperature is Kelvin, where 0 degrees Celsius equals 273.15 Kelvin.

Q: Which of the following is NOT a state of matter?

Answer: D. Vacuum — Matter is anything that has mass and occupies space; vacuum is the absence of matter.

Q: Which factor decreases the rate of evaporation?

Answer: B. Increase in humidity — Increased humidity means more water vapor is already in the air, which slows down the rate of evaporation.

Q: During the conversion of ice to water, the temperature remains constant because:

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.

SCIENCE · CLASS 9th · Andhra State Board

Practice Chapter 1 PHYSICAL SCIENCE : Matter in Our Surroundings with a free chapter-wise online MCQ test for Andhra State Board CLASS 9th SCIENCE. This chapter covers: This chapter covers physical nature of matter states of matter interconversion of states evaporation factors affecting evaporation and latent heat.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 1 PHYSICAL SCIENCE : Matter in Our Surroundings — Important Questions & Answers (FAQ)

Frequently asked questions from Andhra State Board CLASS 9th SCIENCE — Chapter 1 PHYSICAL SCIENCE : Matter in Our Surroundings, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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.

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.

Next Chapter →

Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure?