## Answers

2. correct option is (a)

Because still we don't have any proof that there is something present beyond the universe and our universe is so large that we are not able to reach at it's edge so in such case how we can give any statement about the matter present outside this universe

3. Yes, it is possible that a valid scientific hypothesis may become wrong if we got some evidence against hypothesis

4.a. Pleased to change my opinion

5. So that we can minimize the chances of error due to human measurement or instrumental error.

6.

Average value minimize the error in measurement.

7. As we know that error in density is equal to

Hence length or diameter will contribute most in the total error

error +

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.
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