Question

Marks: 25
(3)
St. Francis of Assisi Convent High School, Navsari
Assignment: 2020-2021
Std-VI
Subject- Science
QI(A) Fill in the blanks to make the statements true:
1) have fixed melting points.
2) The reverse process of evaporation is
3) A balloon changes its
and
on blowing air into it.
(B) State whether the following statements are True or False:
1) Milk is a compound.
2) Butter is separated from milk by filtration.
3) Tearing of a paper is a reversible change.
4) Change of seasons is a natural change.
Q II (A) Match the following and rewrite the correct answer:
(2)
(2)
B
(1)
(1)
(3)
A
Answers
1) Handpicking
a) irreversible change
2) Condensation
b) separating large sized impurities
3) Breaking of glass
c) reversible change
4) Evaporation of water
d) conversion of water vapour into liquids
(B) Answer the following questions in one word:
1) Name the method used to separate stones from grains.
2) Name the change in which no new substance is formed.
(C) Classify the following into fast or slow changes:
(rusting of iron, growth of a tree)
Q III (A) Define the following terms:
1) Sedimentation
2) Chemical change
3) Saturated solution
(B) Give scientific reasons:
1) Alum is used in loading.
2) A metal rim is slightly smaller than a wooden wheel on which it is to be fixed.
Q IV Write a short note on: Threshing
QV Answer the following questions in detail:
Q 1) How would you obtain clear water from a sample of muddy water?
Q2) Why do we need to separate different components of a mixture? Give two examples.
Q 3) Explain: Explosion of a cracker is a chemical change.
Q 4)State the differences between reversible changes and irreversible changes.
(2)
(8)​

Answer 1

Answer:

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