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Categorise the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’
[
CBSE Class 8
]
(1)
The liquid is a conductor and the circuit is also complete, but the bulb does not glow
[
CBSE Class 8
]
(1)
The bulb in the tester does not glow when current is passed through
[
CBSE Class 8
]
(1)
Give the characteristics of synthetic fibres
[
CBSE Class 8
]
(1)
What are the disadvantages of wearing synthetic fabrics?
[
CBSE Class 8
]
(1)
How can you make a tester for testing whether a given material
[
CBSE Class 8
]
(1)
Why people prefer to wear acrylic sweaters than pure wool sweaters?
[
CBSE Class 8
]
(1)
What are the advantages of using fabrics made of polyester?
[
CBSE Class 8
]
(1)
The bulb does not glow in the set-up shown in figure
[
CBSE Class 8
]
(1)
Give some uses of nylon
[
CBSE Class 8
]
(1)
What are the advantages of nylon?
[
CBSE Class 8
]
(1)
(a) Name the agency responsible for making quake proof houses?
[
CBSE Class 8
]
(1)
Give three advantages of rayon
[
CBSE Class 8
]
(1)
Give examples to show that plastics are noncorrosive in nature
[
CBSE Class 8
]
(1)
Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material ? Advice Rana, giving your reason
[
CBSE Class 8
]
(1)
(a) Why do dry hair stand on when combed with a plastic comb?
[
CBSE Class 8
]
(1)
Explain why the following are made of thermosetting plastics
[
CBSE Class 8
]
(1)
Name the device used to secure tall buildings from lightning. Explain
[
CBSE Class 8
]
(1)
If your friend is struck by lightning, how will you help him?
[
CBSE Class 8
]
(1)
Explain why plastic containers are favoured for storing food
[
CBSE Class 8
]
(1)
During a thunderstorm, which places are unsafe if you are outside?
[
CBSE Class 8
]
(1)
Give one use each of bakelite, nylon and acrylic
[
CBSE Class 8
]
(1)
During a thunderstorm which places are safe?
[
CBSE Class 8
]
(1)
What steps should be taken to protect yourself in case of an earthquake
[
CBSE Class 8
]
(1)
Give three advantages of polythene over natural materials
[
CBSE Class 8
]
(1)
Describe with the help of a diagram an instrument which can be used to detect
[
CBSE Class 8
]
(1)
How can we control the spread of malaria or dengue?
[
CBSE Class 8
]
(1)
Suppose you are outside your home and an earthquake strikes
[
CBSE Class 8
]
(1)
Write a short paragraph on the harms caused by microorganisms
[
CBSE Class 8
]
(1)
Is it true that a charged object always attracts an uncharged object
[
CBSE Class 8
]
(1)
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