Physics 9th Chap 1 Topic 5(Scientific Notation)

Physics Chapter 1 (Topic5 : Scientific Notation)

Analyze and express numerical data using scientific notation [In
measurements and calculations].

Question(s) will be asked in final examination.

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Q1. Which of the following is correctly written in scientific notation?

A) 45000 = 4.5 × 10⁴

B) 45000 = 45 × 10³

C) 45000 = 0.45 × 10⁵

D) 45000 = 4.5 × 10³

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Q2. Which number is correctly expressed in standard scientific form?

A) 0.0032 = 3.2 × 10⁻²

B) 0.0032 = 32 × 10⁻⁴

C) 0.0032 = 3.2 × 10⁻³

D) 0.0032 = 0.32 × 10⁻²

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Q3. Which value is larger?

A) 2 × 10³

B) 5 × 10²

C) 1 × 10⁴

D) 9 × 10¹

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Q4. A mass of 0.00056 kg is written in scientific notation as:

A) 5.6 × 10⁻³

B) 5.6 × 10⁻⁴

C) 56 × 10⁻⁵

D) 0.56 × 10⁻³

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Q5. Which is NOT in correct scientific notation?

A) 6 × 10⁵

B) 9.1 × 10³

C) 12 × 10⁴

D) 3.0 × 10⁻²

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Q6. The speed of light is 300,000,000 m/s. Its correct scientific notation is:

A) 3 × 10⁸

B) 30 × 10⁷

C) 0.3 × 10⁹

D) 3 × 10⁷

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Q7. Which number is smallest?

A) 4 × 10⁻²

B) 5 × 10⁻³

C) 9 × 10⁻¹

D) 1 × 10⁻⁴

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Q8. Why is scientific notation useful in physics?

A) It avoids units

B) It simplifies very large or small numbers

C) It removes calculations

D) It replaces formulas

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Q9. Which is the correctly expanded form of 7.2 × 10⁵?

A) 72000

B) 720000

C) 7200000

D) 7200

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Q10. 6.5 × 10⁻³ is equal to:

A) 0.0065

B) 0.065

C) 0.00065

D) 0.65

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Q11. Which expression correctly compares magnitudes?

A) 10² > 10³

B) 10⁴ < 10³

C) 10⁵ > 10⁴

D) 10¹ < 10⁰

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Q12. A bacterial size is 2 × 10⁻⁶ m. This indicates:

A) Very large size

B) Moderate size

C) Very small size

D) No measurable size

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Q13. Which is correctly ordered from smallest to largest?

A) 10³, 10², 10¹

B) 10⁻³, 10⁻², 10⁻¹

C) 10¹, 10², 10³

D) 10⁻¹, 10⁻³, 10⁻²

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Q14. Which number is equivalent to 1.0 × 10⁰?

A) 0

B) 1

C) 10

D) 100

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Q15. Which scientific notation is correct for 0.000001?

A) 1 × 10⁻⁵

B) 1 × 10⁻⁶

C) 1 × 10⁻⁷

D) 10 × 10⁻⁶

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Q16. Which statement is true?

A) Negative exponent means large number

B) Positive exponent means small number

C) Scientific notation always uses base 10

D) Coefficient can be any number

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Q17. Which is NOT correctly expressed?

A) 3 × 10⁴

B) 1.2 × 10³

C) 9.8 × 10⁻²

D) 12.5 × 10²

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Q18. Which is the correct form of 98000?

A) 9.8 × 10⁴

B) 98 × 10³

C) 0.98 × 10⁵

D) All of these are correct

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Q19. Why must the coefficient be between 1 and 10?

A) To avoid units

B) To standardize representation

C) To increase value

D) To remove exponent

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Q20. Which is larger?

A) 3 × 10⁶

B) 9 × 10⁵

C) 1 × 10⁷

D) 8 × 10⁴

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Q21. 4.0 × 10³ × 2.0 × 10² equals:

A) 8 × 10⁵

B) 6 × 10⁵

C) 8 × 10⁶

D) 6 × 10⁶

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Q22. Which rule applies to multiplication in scientific notation?

A) Add coefficients, subtract powers

B) Multiply coefficients, add powers

C) Divide coefficients, subtract powers

D) Multiply powers only

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Q23. 10⁴ ÷ 10² equals:

A) 10⁶

B) 10²

C) 10⁻²

D) 10⁴

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Q24. Which number is closest to scientific form?

A) 45 × 10²

B) 4.5 × 10³

C) 0.45 × 10⁴

D) 450 × 10¹

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Q25. A very large astronomical distance is best expressed using:

A) Decimal form

B) Fraction form

C) Scientific notation

D) Percentage form

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Q26. Which is correct conversion of 0.00032?

A) 3.2 × 10⁻³

B) 3.2 × 10⁻⁴

C) 32 × 10⁻⁵

D) 0.32 × 10⁻³

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Q27. Which expression shows correct application in physics?

A) Mass = 5 × 10² kg

B) Time = 2 × 10⁻³ m

C) Speed = 3 × 10² kg

D) Force = 4 × 10⁻² s

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Q28. Which number is greater?

A) 10⁻²

B) 10⁻³

C) 10⁻⁴

D) 10⁻¹

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Q29. Scientific notation mainly helps in:

A) Increasing measurement error

B) Avoiding units

C) Handling extreme values easily

D) Removing calculations

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Q30. Which is correctly written scientific notation for 1500000?

A) 1.5 × 10⁶

B) 15 × 10⁵

C) 0.15 × 10⁷

D) All of these

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