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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.
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Find the odd man out:
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A metal ball of mass 5 kg falls from a height of 490 m. How much time it will take to reach the ground? (g = 9.8 m/s2)
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What would be the value of ‘g’ on the surface of the earth if its mass was twice and its radius half of what it is now?
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What is the acceleration due to gravity?
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State two uses of a concave mirror.
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Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
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Explain ‘Electric generator’ with the help of the following points:
- Diagram of an AC Generator with labelling
- Principle of an electric generator
- The function of slip rings
- Any two uses of a generator.
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Answer the following question:
Distinguish between the convex mirror and the concave mirror.
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Choose the correct alternative and rewrite the following:
Iron is _____________________.
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Answer the following question:
What is corrosion? Do gold ornaments corrode? Justify.
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Write a short note on Alloying.
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Observe the following picture and answer the following questions:
- What is rust?
- Write the chemical formula of rust.
- Write the reaction of oxidation of iron at the anode.
- Write the reaction of oxidation of iron at the cathode.
- What is corrosion?
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The value of gravitational acceleration (g) is ________.
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The free fall of an object is possible only in _______.
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Arrange the following elements in order of their decreasing metallic character.
Na, Si, Cl, Mg, Al
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The tendency of an element to form cation is the _______ character of that element.
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The tendency of an element to form anion is the ______ character of that element.
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The frequency of AC is _______.
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