Question

28
29.
3
3
30.
How water is useful for plants and animals?
What is neutralization reaction?
How factory waste is treated before disposing into water
bodies?
Why different varieties of animals are found in tropical
region?
Distinguish between physical and chemical change with
examples
Give any three adaptations in penguins.
Draw a labelled diagram of Laboratory thermometer
3
31.
3
32.
33.
3
3
34.
5
SECTION D
Explain the chemical reaction between sodium hydroxide
(NaOH) and hydrochloric acid (HCL)
OR
Prove that burning of magnesium ribbon is a chemical
change
a) What will happen when baking soda is mixed with
vinegar?
b) Give any three acids and their natural sources.
35.
5
5
36.
The distance covered by a body after every 4 seconds is
given in the table plot the distance-time graph.
4
8.
12
16
Time in second
5
10
15
20
Distance covered in metre
OR
a) Define time period
b) Find the time period of a pendulum which takes 24
seconds to complete 20 oscillations​

Answer 1

Answer:

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