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Olympiad Test: Changes Around Us -1


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20 Questions MCQ Test Science Olympiad Class 6 | Olympiad Test: Changes Around Us -1

Olympiad Test: Changes Around Us -1 for Class 6 2022 is part of Science Olympiad Class 6 preparation. The Olympiad Test: Changes Around Us -1 questions and answers have been prepared according to the Class 6 exam syllabus.The Olympiad Test: Changes Around Us -1 MCQs are made for Class 6 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Changes Around Us -1 below.
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Olympiad Test: Changes Around Us -1 - Question 1

Which of the following is a reversible change?

Detailed Solution for Olympiad Test: Changes Around Us -1 - Question 1

Melting of ice is a physical change in which substance changes its physical state but not properties. Hence it is a reversible change in which melted ice can freeze again by decrease in temperature.

Olympiad Test: Changes Around Us -1 - Question 2

In a chemical change:

Detailed Solution for Olympiad Test: Changes Around Us -1 - Question 2

In a chemical change, the molecules in the reactants interact to form new substances. In a physical change, like a state change or dissolving, no new substance is formed. Explain that another way to say that no atoms are created or destroyed in a chemical reaction is to say, “Mass is conserved.”

Olympiad Test: Changes Around Us -1 - Question 3

Which of the following is an example of physical change?

Detailed Solution for Olympiad Test: Changes Around Us -1 - Question 3

Boiling waterBoiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.

Olympiad Test: Changes Around Us -1 - Question 4

In a chemical change:

Detailed Solution for Olympiad Test: Changes Around Us -1 - Question 4

All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy.

Olympiad Test: Changes Around Us -1 - Question 5

While making a wooden wheel, the iron rim is made slightly smaller than wooden wheel. Why?

Choose the correct option.

Olympiad Test: Changes Around Us -1 - Question 6

Electric wires or telephone wires become tight during winter but sag a little during summer, because they are made of metal which:

Detailed Solution for Olympiad Test: Changes Around Us -1 - Question 6

Because the cores of overhead wires are made from copper. Metals expand with heat and contract with cold. In winter, the reverse happens - the lines contract and tighten up.

Olympiad Test: Changes Around Us -1 - Question 7

Which of the following is not an example of the changes that occur by mixing two substances?

Olympiad Test: Changes Around Us -1 - Question 8

The changes which are not useful to us and may cause harm are called undesirable changes. Which of the following is/are example(s) of undesirable changes?

Olympiad Test: Changes Around Us -1 - Question 9

Which of the following are true?

Olympiad Test: Changes Around Us -1 - Question 10

Read the activity carefully.
1. Take two flasks, flask A and flask B.
2. In both of the flasks, take some lemon juice.
3. In flask A, add washing soda in the lemon juice.
4. In flask B, add salt in the lemon juice.

Q. Which could be the observation of this experiment?

Olympiad Test: Changes Around Us -1 - Question 11

Physical changes can be generally reversed. Which of the following is an example of a physical change?
1. Zinc oxide, on heating, changes to yellow colour. However, on cooling, its colour changes to white.
2. When a piece of iron is stroked with a permanent magnet, it gets magnetized. However, if the magnetized iron is hammered, it loses its magnetism.
3. Wax, on being heated, changes into its liquid state. However, liquid wax changes into solid on cooling.

Olympiad Test: Changes Around Us -1 - Question 12

Look at the following graph. It represents the energy consumption of a reaction. What kind of a change is it?

Olympiad Test: Changes Around Us -1 - Question 13

Shahna took a small amount of lead nitrate in a dry test tube, holding the test tube with a test-tube holder. She put the test tube over the flame of the burner, and heated it. Soon a brown gas with a pungent smell is produced. The gas turns blue litmus red. She also observes a yellow solid residue remains in the test tube.

Q. Conclusion of the above experiment may be:

Olympiad Test: Changes Around Us -1 - Question 14

In which of the following statements is it proven that energy keeps on moving from one source to another and that it is not static?

Olympiad Test: Changes Around Us -1 - Question 15

What property remains the same during physical or chemical changes?

Detailed Solution for Olympiad Test: Changes Around Us -1 - Question 15

During a physical change, the arrangement of particles may change but the mass, number of atoms and number of molecules will stay the same. During a chemical change, the mass and number of atoms is conserved, but the number of molecules is not always the same. Chemical reactions involve large changes in energy.

Olympiad Test: Changes Around Us -1 - Question 16

Which of the following does not indicate a chemical change?

Detailed Solution for Olympiad Test: Changes Around Us -1 - Question 16

However, one thing that does not indicate a chemical change is the change of shape. When the new form occurs from these two substances are mixed mean that it could be something else like a physical change. There are different types of chemical changes. One is the chemical change, and the other is organic change.

Olympiad Test: Changes Around Us -1 - Question 17

What is common among the following phenomena?
1. A slice of apple, if kept in the open, develops a brown colour.
2. Burning of magnesium ribbon.
3. A new substance is formed during this change.

Olympiad Test: Changes Around Us -1 - Question 18

Look at the flowchart and study it carefully.

Q. Which of the following is correct?
 

Olympiad Test: Changes Around Us -1 - Question 19

Which statement is not correct?

Olympiad Test: Changes Around Us -1 - Question 20

A teacher kept a beaker of water on a hot plate. The beaker is shown before and after the hot plate is turned on.


Q. What evidence points to the fact that water is changing state?

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