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Answer these questions for practice which are simply logical.

Q1.A spring is hanged vertically with natural length l.What should be the mass m attached to the spring so that the spring gets compressed by l/2.

Q2. All houses are mainly made up of cement & iron but he coeff. of expansion of iron & cement are different therefore when the temperature increases the walls & ceiling of the houses should collapse but they don't why so.

Q3. A no. abcdef when multiplied with 6 gives defabc find the no.

Ans 142857

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