Session Ending Examination Class - 8 Subject Social Science (60 Marks | 2:30 Hours) ******************************************************** Examinations are not just a test of memory; rather, they are a true measure of understanding, application, and confidence. Therefore, practice papers play a crucial role in preparing students for the Session Ending Examination of Class 8 Social Science . In fact, solving well-designed practice papers helps students become familiar with the 60-mark paper pattern and the 2 hours 30 minutes time limit . To begin with, practice papers help students understand the structure of the question paper , including MCQs, short-answer questions, long-answer questions, and case-based questions. As a result, students learn how to allocate time wisely to each section. Moreover, regular practice improves writing speed and presentation skills, which are essential for scoring well. In addition, Social Science is a subject that requires c...
Chapter-Methods of Separation in Everyday Life
Class - 6
Subject-Science
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1. What purpose does handpicking serve in
the process of separation?
(i) Filtration
(ii) Sorting
(iii) Evaporation
(iv) Decantation
2. Which of the following substances are commonly
separated using the churning method?
(i) Oil from water
(ii) Sand from water
(iii) Cream from milk
(iv) Oxygen from air
3. Which factor is usually essential for the filtration?
(i) Apparatus size
(ii) Presence of air
(iii) Pore size
(iv) Temperature of the mixture
4. State with reason(s) whether the following statements are
True [T] or False [F]. Also, correct the False statement(s).
(i) Salt can be separated from salt solution by keeping it
under the Sun. [ True ]
(ii) Handpicking should be used only when the quantity
of one component is less. [ True ]
(iii) A mixture of puffed rice and rice grains can be
separated by threshing. [ False ]
(iv) A mixture of mustard oil and lemon water can be
separated by decantation. [ True ]
(v) Sieving is used to separate a mixture of rice flour
and water. [ False ]
5. Match the mixtures with their method of separation:
Use decantation when:
Nasal hair works like a filter to trap dust and harmful particles from the air we breathe.
Masks are made of fabric or non-woven material like cotton or polypropylene.Role: They act as filters, blocking dust, germs, and viruses from entering the body.
Step 1: Handpick the potatoes.
Title: "Leela’s Smart Solution"
Answer: (i)-d, (ii)-e, (iii)-a, (iv)-b, (v)-c
6. In what situations would you use decantation instead of filtration to
separate solids from liquids?
Answer:
When to use decantation instead of filtration?
The solid settles at the bottom.The liquid can be poured off without needing fine filtration. Example: separating oil from water.
7. Can you relate the presence of nasal hair to any separation process?
Answer:
Nasal hair as a separation process:
8. During the COVID-19 pandemic, all of us wore masks. Generally, what material are
they made of? What is the role of these masks?
Answer:
Materials and role of masks during COVID-19:
9. A mixture containing potatoes, salt and sawdust has been given to you. Outline a
stepwise procedure for separating each component from this mixture.
Answer:
Stepwise procedure to separate potatoes, salt, and sawdust:
Step 2: Add water to dissolve the salt.
Step 3: Filter the mixture to remove sawdust.
Step 4: Evaporate the water to get back the salt.
10. Read the following story titled ‘Intelligent Leela’ and tick the most appropriate options.
Provide a suitable title of your choice for the paragraph.
Leela was working in the farm with her father when she realised that they left their
drinking water at home. Before her father felt thirsty/hungry, she went to the nearby
pond to fetch some water/grains. After obtaining some water in the container, she
noticed that the water was muddy and fit/unfit for drinking. To purify the water, she
kept it for some time and then she filtered/ churned the muddy water using a piece
of paper/muslin cloth. Leela, then, cooled/boiled the water for about 10 minutes in a
covered pan. After cooling/boiling, she filtered/churned it again and made it fit/unfit
for drinking. She served this water to her father while having food, who blessed her and
appreciated her efforts.
Answer:
Story of ‘Intelligent Leela’:
Leela separated muddy water by sedimentation and filtration, then boiled it to make
it fit for drinking.
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