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Olympiad Test: Matter in Our Surroundings- 2 - Class 9 MCQ


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10 Questions MCQ Test Science Olympiad Class 9 - Olympiad Test: Matter in Our Surroundings- 2

Olympiad Test: Matter in Our Surroundings- 2 for Class 9 2024 is part of Science Olympiad Class 9 preparation. The Olympiad Test: Matter in Our Surroundings- 2 questions and answers have been prepared according to the Class 9 exam syllabus.The Olympiad Test: Matter in Our Surroundings- 2 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Matter in Our Surroundings- 2 below.
Solutions of Olympiad Test: Matter in Our Surroundings- 2 questions in English are available as part of our Science Olympiad Class 9 for Class 9 & Olympiad Test: Matter in Our Surroundings- 2 solutions in Hindi for Science Olympiad Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Olympiad Test: Matter in Our Surroundings- 2 | 10 questions in 20 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Science Olympiad Class 9 for Class 9 Exam | Download free PDF with solutions
Olympiad Test: Matter in Our Surroundings- 2 - Question 1
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On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperature will be

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 1

Temperature on Kelvin scale = Temperature

on Celsius scale + 273

(i) Temperature on Celsius scale = 308 – 273

(i) = 35°C

(ii) = 329 – 273

= 56°C

(iii)= 391 – 273

= 118°C

Olympiad Test: Matter in Our Surroundings- 2 - Question 2
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If the temperature of an object is 268 k, it will be equivalent to

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 2

Temperature on Celsius scale = Temperature

on Kelvin scale + 273

= 268 – 273

= – 5°C

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Olympiad Test: Matter in Our Surroundings- 2 - Question 3
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When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 3
To turn solid ice into liquid water we have to push the water molecules inside further apart and break apart the framework (or crystalline structure) that holds them together. So while ice is melting (during the change of state from solid water to liquid ice) all the heat energy we supply is being used to separate molecules and none is left over for raising the temperature. The heat needed to change a solid into a liquid is called the latent heat of fusion.
Olympiad Test: Matter in Our Surroundings- 2 - Question 4
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In the following diagram ammonia gas obtained from ammonium hydroxide reacts with HCl (g) obtained from hydrochloric acid, and form white fumes of ammonium chloride. Observe the following diagram and answer the following question
Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 4
Ammonia is a weak base and it combines with HCl to form ammonium chloride. But moisture is necessary to bring out this reaction. So when exposed to air they combine to form dense fumes of ammonium chloride. The salts produced by the action of ammonia on acids are known as the ammonium salts and all contain the ammonium ion.
Olympiad Test: Matter in Our Surroundings- 2 - Question 5
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The evaporation of water increases under the following conditions
Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 5
When surface area increases and the temperature rises, evaporation of water also increases, because the area which is exposed to the outer atmosphere is more and increasing the temperature, leads to an increase in the kinetic energy, due to which the rate of evaporation also increases.
Olympiad Test: Matter in Our Surroundings- 2 - Question 6
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Which of the following energy is absorbed during the change of state of a substance?
Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 6
Latent heat is absorbed during the change of state of a substance because it is the heat energy that has to be supplied to change the state of a substance, while the specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

The heat capacity of a system is defined as the amount of heat needed to raise the system's temperature by one degree.

Olympiad Test: Matter in Our Surroundings- 2 - Question 7
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Which of the following are also considered to be the states of matter?

(i) BEC (ii) BHC (iii) plasma (iv) platelets
Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 7
Plasma and BEC (Bose-Einstein condensate) are also considered as states of matter because plasma is mixture of free atoms and ions and BEC occupies space and has mass.
Olympiad Test: Matter in Our Surroundings- 2 - Question 8
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The boiling point of ethane is, –88°C. This temperature will be equivalent to
Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 8

Temperature on Kelvin scale = Temperature

on Celsius scale + 273

= – 88 + 273

= 185 k

Olympiad Test: Matter in Our Surroundings- 2 - Question 9
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When water at 0°C freezes to form ice at the same temperature of 0°C, then it
Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 9
When the liquid water turns to solid ice we find that water freezes without getting any colder. That's because the latent heat of fusion is being lost from the liquid as it solidifies and the temperature of the water does not fall so quickly.
Olympiad Test: Matter in Our Surroundings- 2 - Question 10
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During summer days water kept in an earthen pot (pitcher) becomes cool because of the phenomenon

of
Detailed Solution for Olympiad Test: Matter in Our Surroundings- 2 - Question 10
An earthen pot (matka) has small pores in it. Water seeps through these pores and reaches the outer surface of the earthen pot. This water then evaporates by taking heat from the earthen pot, thereby making it cooler.
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