Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 36 - 40 of 208

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Question 36

Chemistry
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Question

MCQ▾

At higher altitude, the boiling point of water ________

Choices

Choice (4)Response

a.

First increase then remains constant

b.

Decreases

c.

Increases

d.

Remains same

Question 37

Chemistry
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Question

MCQ▾

Two gas jars are kept as shown below. After some time both the gas jars are filled with brown gas.

Two gas jars are kept as shown Image

Two Gas Jars Are Kept as Shown Image

Loading Image

Which phenomenon describes this process?

Choices

Choice (4)Response

a.

Condensation

b.

Diffusion

c.

Filtration

d.

Evaporation

Question 38

Chemistry
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Question

MCQ▾

The pressure on 60ml of a gas is changed from 760mm to 900mm. What is the new volume at the same temperature?

Choices

Choice (4)Response

a.

900 mm

b.

56.66 ml

c.

50.66 ml

d.

38.0 ml

Question 39

Chemistry
Edit

Question

MCQ▾

The three states of matter are represented by diagrams X, Y and Z.

Three states of matter are represented by diagrams X,Y and Z.

Three States of Matter Are Represented by Diagrams X, Y and Z

Loading Image

Which change occurs during condensation?

Choices

Choice (4)Response

a.

Z to X

b.

X to Y

c.

X to Z

d.

Y to X

Question 40

Chemistry
Edit

Question

MCQ▾

The shiny grey crystal of Iodine directly changes into violet colored vapor without melting. This process is called ________.

Choices

Choice (4)Response

a.

Melting

b.

Freezing

c.

Boiling

d.

Sublimation