मराठी

State whether the following statement is true or false: Ships suffer a lot of damage though they are painted. - Science

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प्रश्न

State whether the following statement is true or false:

Ships suffer a lot of damage though they are painted.

पर्याय

  • True

  • False

MCQ
चूक किंवा बरोबर
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उत्तर

This statement is True.

Explanation:

While ships are painted to protect them from the harsh marine environment, they can still suffer damage. The paint acts as a protective layer against corrosion caused by water, salt and marine organisms, but over time, the paint can wear off due to factors like weathering, abrasion and biofouling. Therefore, despite being painted, ships may still experience damage to their hulls and other parts.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 6: Physical and Chemical Changes - VERY SHORT ANSWER QUESTIONS [पृष्ठ ३५]

APPEARS IN

एनसीईआरटी एक्झांप्लर Science [English] Class 7
पाठ 6 Physical and Chemical Changes
VERY SHORT ANSWER QUESTIONS | Q 11. (c) | पृष्ठ ३५

संबंधित प्रश्‍न

Explain why Iron sheets are coated with zinc during galvanization.


The chemical reaction involved in the corrosion of iron metal is that of:
(a) oxidation as well as displacement
(b) reduction as well as combination
(c) oxidation as well as combination
(d) reduction as well as displacement


No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.

(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.

(ii) Mention any two types of reactions under which above chemical reaction can be classified.


Write scientific reasons.

Lemon or tamarind is used for cleaning copper vessels turned greenish.


Answer the following question.
a) What is meant by corrosion?
b) Write names of any two methods of prevention of corrosion.
c) In which method, metal like copper, aluminium are coated with a thin layer of their oxides by means of electrolysis.
d) Explain this method with diagram.


Answer the following question.

List two properties of alloys.


Give reason.

A wooden article should be polished.


Observe the following figure and write the answer of the question.

  1. Which process is shown in the figure?
  2. Explain the chemical reaction shown in the figure.
  3. Write the reactions on anode and cathode.

A man painted his main gate made up of iron, to

  1. prevent it from rusting.
  2. protect it from sun.
  3. make it look beautiful.
  4. make it dust free.

Which of the above statement(s) is/are correct?


Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?


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