MEDIUM
6th CBSE
IMPORTANT
Earn 100

When dry Plaster of Paris powder is mixed with water to form a paste, it liberates heat and then hardens to form a substance called gypsum. Is the hardening of Plaster of Paris a physical or a chemical change? Give the reason for your answer.

Important Questions on Test Paper-2

MEDIUM
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 2

Figures i., ii. and iii. given below show steps involved in the activity to test the presence of starch in leaves.
Explain what is happening in figures ii. and iii.

Question Image

MEDIUM
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 3
Why do lightning and thunder take place during heavy rains?
MEDIUM
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 4
Suhani has a bar magnet with no markings on it. How will she identify its poles by using another bar magnet with a north pole marked on it? 
MEDIUM
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 5
What features of birds help them in reducing their body weight and easy movement in air?
EASY
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 6
Write a short note on the importance of rainwater harvesting in today’s life.
MEDIUM
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 7
How is the balance of oxygen and carbon dioxide maintained in the atmosphere?
HARD
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 8
Name the parts of the shadow formed by an extended object. Support your answer with the help of a diagram.
MEDIUM
6th CBSE
IMPORTANT
Head Start Science 6>Chapter 20 - Test Paper-2>TEST PAPER>Q 9
What are hydrophytes? What are their adaptations?