CBSE Class 9 Chemistry Chapter 1 Matter in Our Surroundings — 20 MCQs with Answers

Matter is defined as anything that has mass and occupies space. The first set of MCQs tests your grasp of this definition and your ability to distinguish matter from non-matter entities like light and sound. NCERT emphasizes that light and sound do not have mass or volume, so they are not classified as matter. These questions also check your understanding of the three states of matter and the particle model that underpins them. Recall that solids have tightly packed particles in fixed positions, liquids have particles that slide past each other, and gases have particles far apart moving randomly. Mastering these basics is crucial before tackling more advanced questions on state change and evaporation.

This section focuses on the unique characteristics of each state. Solids resist compression because particles are tightly packed; liquids flow and take the shape of their container because particles can slide; gases expand to fill any container because particles move independently. NCERT explains that the kinetic energy of particles increases from solid to liquid to gas. These MCQs test your ability to apply these ideas to everyday situations — why a gas cylinder can be compressed, why water spills but a wooden block does not, and why gases have no fixed volume. Understanding these properties is essential for the board exam and for Chapter 2 (Is Matter Around Us Pure) where mixtures and solutions are discussed.

Change of state is a physical change in which matter converts from one state to another without altering its chemical composition. NCERT defines six types: melting (solid to liquid), freezing (liquid to solid), evaporation (liquid to gas below boiling point), boiling (liquid to gas at boiling point), condensation (gas to liquid), and sublimation (solid directly to gas). Energy in the form of heat drives these changes. Adding heat increases particle kinetic energy, causing melting or evaporation. Removing heat decreases kinetic energy, leading to freezing or condensation. These MCQs test your ability to identify the correct term for a given process and to predict what happens when heat is added or removed.

Evaporation is the surface phenomenon in which liquid particles with high kinetic energy escape into the air as gas, even below the boiling point. NCERT identifies four main factors affecting evaporation rate: temperature (higher means faster), surface area (larger means faster), humidity (lower means faster), and wind speed (higher means faster). Evaporation is a cooling process because the high-energy particles leave, reducing the average kinetic energy (temperature) of the remaining liquid. This is why we feel cool after sweating or after a bath. These MCQs test your ability to apply these principles to real-world scenarios like drying clothes, cooling water in earthen pots, and using fans.

CBSE papers often include assertion-reason type questions that test deeper understanding. You are given two statements: Assertion (A) and Reason (R). You must decide if both are true, if one is true, and if R correctly explains A. NCERT concepts like latent heat (hidden heat absorbed or released during state change without temperature change) and the cooling effect of evaporation are commonly tested in this format. These questions require you to connect cause and effect, not just recall facts. Practicing these sharpens your analytical skills and prepares you for the tougher 1-mark questions in board exams. Pay close attention to the wording — sometimes both statements are true but R does not explain A.

Some MCQs test your ability to apply NCERT concepts to everyday life or interpret simple numerical data. For example, understanding that the boiling point of water is 100°C at standard atmospheric pressure but changes with altitude, or knowing that density is mass per unit volume and using it to compare substances. NCERT does not give complex calculations in Chapter 1, but you should be comfortable with the density formula and the idea of latent heat. These questions often appear in board exams as 1-mark MCQs that separate students who understand concepts from those who memorize. Practice helps you recognize patterns and avoid common traps.

MCQs seem simple, but careless mistakes cost marks. Here is a proven strategy for CBSE Class 9 Chemistry MCQs based on Chapter 1. First, read the question stem carefully — underline keywords like 'NOT', 'increase', 'decrease'. Many students lose marks by missing a negative word. Second, try to answer the question in your head before looking at the options; this prevents confusion from distractors. Third, eliminate obviously wrong options first — often two choices are clearly incorrect, leaving you a 50-50 guess if needed. Fourth, for assertion-reason questions, evaluate each statement separately, then check if R explains A. Fifth, manage your time: do not spend more than 30-40 seconds per MCQ in a 40-question paper. Sixth, if stuck, mark the question and move on — return during revision time. Seventh, review NCERT definitions verbatim; CBSE often uses exact NCERT language in correct answers. Eighth, practice MCQs from previous years and NCERT exemplar. Finally, avoid changing answers unless you are very sure — your first instinct is often correct. CBSETUTOR.ai offers unlimited AI-powered MCQ practice with instant feedback and photo-based doubt solving at just ₹999/month (one price for Classes 6-12), with a 3-day free trial. Students report 15-20 percent improvement in MCQ accuracy after two weeks of daily practice on the platform.