Try each question on your own first. Use the Show Answer button only after you have selected your option, then read the explanation and revise the related concept from your chapter notes.
1. Which of the following is considered as matter?
A. Chair
B. Air
C. Cold drink
D. All of the above
Answer: D. All of the above
Explanation: Anything that occupies space and has mass is defined as matter. Chair, air, and cold drink all have mass and volume.
2. What is the SI unit of density?
A. kg/m³
B. g/cm³
C. kg/L
D. g/L
Answer: A. kg/m³
Explanation: Density is defined as mass per unit volume. Mass is measured in kg and volume in m³, so its SI unit is kg/m³.
3. What is the physical state of water at 100°C?
A. Solid
B. Liquid
C. Gaseous (Steam) / Both Liquid and Gas
D. Plasma
Answer: C. Gaseous (Steam) / Both Liquid and Gas
Explanation: At 100°C (the boiling point of water), liquid water transitions into vapor/steam, existing in both liquid and gaseous states during boiling.
4. The process of change of a solid directly into gas without passing through the liquid state is called:
A. Evaporation
B. Sublimation
C. Condensation
D. Fusion
Answer: B. Sublimation
Explanation: Sublimation is the direct conversion of a solid substance into its gaseous state upon heating (e.g., Camphor, Ammonium Chloride).
5. Which factor increases the rate of evaporation?
A. Increase in surface area
B. Increase in temperature
C. Increase in wind speed
D. All of the above
Answer: D. All of the above
Explanation: Increasing surface area, temperature, and wind speed all enhance the rate at which liquid molecules escape into the air.
6. What is the value of 0°C on the Kelvin scale of temperature?
A. 273.15 K
B. 373 K
C. 100 K
D. 0 K
Answer: A. 273.15 K
Explanation: Temperature in Kelvin = Temperature in °C + 273.15 (commonly taken as 273 K).
7. Dry Ice is the solid form of which gas?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Hydrogen
Answer: B. Carbon dioxide
Explanation: Solid Carbon Dioxide (CO₂) is stored under high pressure and is commonly known as Dry Ice.
8. The phenomenon of intermixing of particles of two different types of matter on their own is known as:
A. Diffusion
B. Osmosis
C. Evaporation
D. Transpiration
Answer: A. Diffusion
Explanation: Diffusion is the spontaneous intermixing of particles of two different substances due to their continuous motion.
9. Which state of matter has a fixed volume but no fixed shape?
A. Solid
B. Liquid
C. Gas
D. Plasma
Answer: B. Liquid
Explanation: Liquids take the shape of the container they are poured into, giving them a indefinite shape, but their volume remains fixed.
10. Why does water stored in an earthen pot (matka) remain cool during summer?
A. Due to sublimation
B. Due to evaporation
C. Due to condensation
D. Due to precipitation
Answer: B. Due to evaporation
Explanation: Water seeps through the tiny pores of the earthen pot and evaporates, causing cooling of the remaining water inside.
This page contains a chapter-wise objective practice set. Try the questions without checking the answer first, then use the explanation to understand the point you missed. The current page contains 10 questions, so you can practise in smaller sets when you are revising.
Quick revision tip
After the practice set, write down the question numbers you missed and revise only those concepts once more. This makes MCQ practice more useful than repeatedly attempting the same questions without reviewing mistakes.
