1. Matter in Our Surroundings Class 9 Science [LATEST] Solutions Additional -Questions 2 in English - CBSE Study
NCERT Solutions for Class 9 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 1. Matter in Our Surroundings with detailed explanations and step-by-step answers for better exam preparation. Each Additional -Questions 2 is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 9 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 9 English Medium Science All Chapters:
1. Matter in Our Surroundings
4. Additional -Questions 2
Questions-Answers (page 6) NCERT BOOK
Q1. The mass per unit volume of a substance is called density.
(density = mass/volume).
Arrange the following in order of increasing density –
air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Q2. (a) Tabulate the differences in the characterisitcs of states of matter.
(b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.
Q3. Give reasons
(a) A gas fills completely the vessel in which it is kept.
(b) A gas exerts pressure on the walls of the container.
(c) A wooden table should be called a solid.
(d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
Q4. Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why?
Questions-Answers (page 9) NCERT BOOK
Q1. Convert the following temperature to celsius scale:
a. 300 K b. 573 K.
Q2. What is the physical state of water at:
a. 250ºC b. 100ºC
Q3. For any substance, why does the temperature remain constant during the change of state?
Q4. Suggest a method to liquefy atmospheric gases.
Questions-Answers (page 10) NCERT BOOK
Q1. Why does a desert cooler cool better on a hot dry day?
Q2. How does the water kept in an earthen pot (matka) become cool during summer?
Q3. Why does our palm feel cold when we put some acetone or petrol or perfume on it?
Q4. Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
Q5. What type of clothes should we wear in summer?
Exercise:
Q1. Convert the following temperatures to the Celsius scale.
(a) 300 K (b) 573 K.
Q2. Convert the following temperatures to the Kelvin scale.
(a) 25°C (b) 373°C.
Q3. Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several metres away.
Q4. Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.
Q5. What is the physical state of water at—
(a) 25°C (b) 0°C (c) 100°C ?
Q6. Give two reasons to justify—
(a) water at room temperature is a liquid.
(b) an iron almirah is a solid at room temperature.
Q7. Why is ice at 273 K more effective in cooling than water at the same temperature?
Q8. What produces more severe burns, boiling water or steam?
Q9. Name A,B,C,D,E and F in the following diagram showing change in its state
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