CBSE Important Questions Class 9 Science Chapter 1 PDF Download
Ananya Gupta25 Oct, 2024
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CBSE Important Questions Class 9 Science Chapter 1: Here are the important questions for Chapter 1 Matter in Our Surroundings. Practicing these questions will help reinforce your understanding of key concepts such as the states of matter, their properties and the differences between physical and chemical changes.
Solving these questions enhances problem-solving skills and prepares you for exams. Moreover, they provide a solid foundation for more advanced topics in science. Make sure to review and practice regularly for the best results.CBSE Important Questions Class 9 Science Chapter 1 Overview
These questions for Class 9 Science Chapter 1 Matter in Our Surroundings has been created by subject experts of Physics Wallah. By focusing on these important questions, learners can strengthen their foundational knowledge and enhance their exam preparation ultimately improving their grasp of scientific principles.CBSE Important Questions Class 9 Science Chapter 1 PDF
The PDF link for the CBSE Important Questions for Class 9 Science Chapter 1 Matter in Our Surroundings is available below. By accessing the PDF, learners can effectively review and practice essential topics, ensuring they are well-prepared for their examinations. Make sure to utilize this valuable material to strengthen your grasp of matter and its properties.CBSE Important Questions Class 9 Science Chapter 1 PDF
CBSE Important Questions Class 9 Science Chapter 1 Matter in Our Surroundings
Here we have provided CBSE Important Questions Class 9 Science Chapter 1 Matter in Our Surroundings- Q.1. Which of the following matter?Chair, air, love, smell, hate, almonds, thought, cold, cold drink, the smell of perfume.
Ans: As we can define matter as any ‘physical substance’, hence almonds, air, chair, the smell of perfume, cold drink and smell can be considered as matter.
Q.2. Convert the following temperature to a Celsius scale: i) The temperature is 300 K.Ans: When we use: K = 273 + ⁰C:
⁰C = K - 273
= 300 - 273
= 27⁰C
ii) The temperature is 573 KAns: When we use: K = 273 + ⁰C:
⁰C = 573 - 273
= 300 ⁰C
What is the physical state of water at:(a) A temperature of 250 ⁰C
Ans: The boiling point of water is 100 ⁰C, hence the physical state of water at 250⁰C will be gaseous.
(b) A temperature of 100 ⁰C
Ans: The boiling point of water is 100 ⁰C, hence at 100 ⁰C water is in the gaseous state.
Q.3. For any substance, why does the temperature remain constant during the change of state?Ans: The reason behind the temperature of substance or matter remaining constant during a change of state is that during the change of state all of the heat or energy provided to particles of matter is utilized to take the particles of matter apart from each other.
Suggest a method to liquefy atmospheric gases.Ans: One method to liquefy atmospheric gases is to decrease the temperature and increase the pressure.
Q.4. Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, and oxygen.Ans: The order of increasing forces of attraction between the particles is as follows:
Oxygen< water< sugar.
Q.5. What is the physical state of water at-(a) A temperature of 25 ⁰C?
Ans: The physical state of water at 25 ⁰C is liquid.
(b) A temperature of ⁰C?
Ans: The physical state of water at ⁰C is solid.
(c) A temperature of 100⁰C?
Ans: The physical state of water at 100⁰C is gas.
Q.6. If the humidity in the air increase then the rate of evaporation:(a) decrease
(b) increase
(c) remain same
(d) both (b) and (a) depending upon the temperature
Ans: The correct option is (a) decrease.
Q.7. Which of the following statements is correct?(a) boiling is a bulk phenomenon and evaporation is a surface phenomenon (b) boiling is a surface phenomenon and evaporation is a bulk phenomenon (c) boiling and evaporation both are a surface phenomenon
(d) boiling and surface both are bulk phenomenon
Ans: The correct option is (a) boiling is a bulk phenomenon and evaporation is a surface phenomenon.
Q.8. If the temperature of a place is increase then evaporation:(a) decrease
(b) increase
(c) remain same
(d) none of the above
Ans: The correct option is (b) increase.
Q.9. Which of the following has the least inter atomic spacing?(a) solid
(b) liquid
(c) gases
(d) plasma
Ans: The correct option is (a), solid.
Q.10. If you decrease the surface area and increase the temperature, then the rate of evaporation(a) increase
(b) decrease
(c) remain same
(d) may increase or decrease depending upon other factors
Ans: The correct option is (c), remain the same.
Q.11. What will be the corresponding temperature in degree centigrade for 300 K:(a) 30 ⁰C
(b) 300 ⁰C
(c) 27 ⁰C
(d) 673 ⁰C
Ans: The correct option is (c), 27 ⁰C.
Q.12. Liquid to gas and gas to liquid changes are called:(a) vaporization and condensation
(b) condensation and vaporization
(c) sublimation and condensation
(d) condensation and sublimation
Ans: The correct option will be (a), vaporization and condensation.
Q.13. Physical state of water at is respectively(a) liquid, solid, and gas
(b) solid, liquid, and gas
(c) solid, gas, and liquid
(d) gas, solid, and liquid
Ans: The correct option is (a), liquid, solid and gas.
Q.20. Convert the following temperatures to the Celsius scale.
a) The temperature is 293 K
Answer: When we use: ⁰C = K - 273
= 293 - 273
= 20 ⁰C
b) The temperature is 470 K
Ans: When we use: ⁰C = K - 273
= 470 - 273
= 197 ⁰C
Q.21. Convert the following temperatures to the Kelvin scale.
a) The temperature is 25 ⁰C
Answer: When we use: K = ⁰C + 273
= 25 + 273
= 298 K
b)The temperature is 373 ⁰C
Ans: When we use: K = ⁰C + 273
= 373 + 273
= 656 K
CBSE Important Questions Class 9 Science Chapter 1 FAQs
What is matter?
What are the three states of matter?
What is density?
Why does ice float on water?
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