science
Grade-5
Easy
Question
Corrosion ________ metals.
- Cleans
- Strengthens
- Weakens
- Glows
Hint:
Metals corrode when exposed in the air which changes their natural composition.
The correct answer is: Weakens
- Metals react with air to form rust. This leads to corrosion.
- Pure metal is used up and the overall structure becomes weak due to eating up of the metal.
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II. Umbrellas are made from plastics.
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(i). Plastics are generally poor conductors of electricity.
(ii). Melamine is a special plastic on which oil and water do not stick.
(iii). Ropes made by Bakelite are used in cranes and elevators
Which of the following options is correct for the following statements?
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(ii). Melamine is a special plastic on which oil and water do not stick.
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(ii). Melamine is a special plastic on which oil and water do not stick.
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Identify the P, Q, and R from the following:
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Identify the P, Q, and R from the following:
Identify the P, Q, and R from the following:
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