HSC Science (General) 11th Standard - Maharashtra State Board Question Bank Solutions

Choose the correct option:

In Avogadro’s constant 6.022 × 10²³ mol^-1, the number of significant figures is ________

What do you mean by significant figures?

State the rules for deciding significant figures.

Distinguish between accuracy and precision.

Why there is a need of rounding off figures during calculation?

Why is accurate measurement crucial in science?

Solve the following question:

Round off the following quantity to two significant figures:

25.55 mL

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Round off the following quantity to two significant figures:

0.00254 m

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Round off the following quantity to two significant figures:

1.491 × 10⁵ mg

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Round off the following quantity to two significant figures:

199 g

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Round off the following quantity to three significant figures:

1.43 cm³

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Round off the following quantity to three significant figures:

458 × 10² cm

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Round off the following quantity to three significant figures:

643 cm²

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Round off the following quantity to three significant figures:

0.039 m

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Round off the following quantity to three significant figures:

6.398 × 10^-3 km

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Round off the following quantity to three significant figures:

0.0179 g

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Round off the following quantity to three significant figures:

79,000 m

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Round off the following quantity to three significant figures:

42,150

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Round off the following quantity to three significant figures:

649.85

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Round off the following quantity to three significant figures:

23,642,000 mm