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17 questions · timed · auto-graded

Question 11 Mark
What type of changes is associated with the germination of a seed? Explain
Answer
  1. Germination of seed is a slow change.
  2. Changes that take place over a long period of time (days) are known as Slow changes.
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Question 21 Mark
Can deforestation be considered a desirable change? Explain.
Answer
No, it is an undesirable change, and it is a human-made change. Deforestation leads to decreasing rainfall and leads to global warming.
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Question 31 Mark
What happen when paper is burnt? Explain.
Answer
Burning of paper takes place within a short period of time (seconds or minutes) So, it is a fast change.
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Question 41 Mark
What is a solution?
Answer
When a solute is dissolved in a solvent, it forms a solution.
Solute + solvent → solution.
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Question 51 Mark
Define a slow change.
Answer
Changes which take place over a long period of time (hours/days/months/years) are known as slow changes.
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Question 61 Mark
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Answer
Yes, I can. It is a physical (reversible) change.
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Question 71 Mark
What kind of a change is associated with decaying of a plants?
Answer
Decaying plants is associated with slow change and chemical change.
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Question 81 Mark
Analogy
Burning of matchstick: _______ change: Rotation of the Earth: Slow change
Answer
Burning of matchstick: fast change: Rotation of the Earth : Slow change
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Question 91 Mark
Analogy
Cooking of food : desirable change :: decaying of food : _______ change
Answer
Cooking of food: desirable change:: decaying of food: undesirable change
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Question 101 Mark
Analogy
Dissolution of glucose : reversible change :: Digestion of food: ___________ change
Answer
Dissolution of glucose: reversible change:: Digestion of food: irreversible change
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Question 111 Mark
Analogy
Photosynthesis : __________ change :: burning of coal : Human – made change
Answer
Photosynthesis : natural change :: burning of coal : Human – made change.
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Question 121 Mark
Analogy
Curdling of milk : irreversible change :: Formation of clouds : ________change
Answer
Curdling of milk : irreversible change :: Formation of clouds : reversible change
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Question 171 Mark
Rusting of Iron : undesirable change : : Dead plants turn into manure : …………..
Answer
Desirable change
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Answer In One word. - Science STD 6 Questions - Vidyadip