Class 9 Science — Chapter 1: Matter in Our Surroundings
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 9 Science, Chapter 1 (Matter in Our Surroundings). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.
Sample questions
Diffusion is fastest in which state of matter?
Gas particles have the largest inter-particle spaces and highest kinetic energy, so diffusion is fastest in gases.
Convert 25 °C to the Kelvin scale.
K = °C + 273.15 ≈ °C + 273. So 25 + 273 = 298 K.
Which of the following does NOT undergo sublimation?
Common salt (NaCl) is an ionic compound with a very high melting point and does not sublime under ordinary conditions. Camphor, iodine and NH₄Cl readily sublime.
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