Physics 9th Chap 1 Topic 5(Scientific Notation)

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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.

1 / 30

Which of the following is correctly written in scientific notation?

A) 45000 = 4.5 × 10⁴

B) 45000 = 4.5 × 10³

C) 45000 = 0.45 × 10⁵

D) 45000 = 45 × 10³

2 / 30

Which number is correctly expressed in standard scientific form?

A) 0.0032 = 32 × 10⁻⁴

B) 0.0032 = 0.32 × 10⁻²

C) 0.0032 = 3.2 × 10⁻³

D) 0.0032 = 3.2 × 10⁻²

3 / 30

Which value is larger?

A) 5 × 10²

B) 9 × 10¹

C) 1 × 10⁴

D) 2 × 10³

4 / 30

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

A) 5.6 × 10⁻⁴

B) 56 × 10⁻⁵

C) 0.56 × 10⁻³

D) 5.6 × 10⁻³

5 / 30

Which is NOT in correct scientific notation?

A) 12 × 10⁴

B) 9.1 × 10³

C) 3.0 × 10⁻²

D) 6 × 10⁵

6 / 30

The speed of light is 300,000,000 m/s. Correct scientific notation is:

A) 3 × 10⁷

B) 0.3 × 10⁹

C) 3 × 10⁸

D) 30 × 10⁷

7 / 30

Which number is smallest?

A) 4 × 10⁻²

B) 9 × 10⁻¹

C) 5 × 10⁻³

D) 1 × 10⁻⁴

8 / 30

Why is scientific notation useful in physics?

A) It avoids units

B) It replaces formulas

C) It removes calculations

D) It simplifies very large or small numbers

9 / 30

Which is correctly expanded form of 7.2 × 10⁵?

A) 720000

B) 7200

C) 72000

D) 7200000

10 / 30

6.5 × 10⁻³ is equal to:

A) 0.065

B) 0.00065

C) 0.0065

D) 0.65

11 / 30

Which expression correctly compares magnitudes?

A) 10² > 10³

B) 10⁵ > 10⁴

C) 10⁴ < 10³

D) 10¹ < 10⁰

12 / 30

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

A) Very large size

B) No measurable size

C) Very small size

D) Moderate size

13 / 30

Which is correctly ordered from smallest to largest?

A) 10⁻¹, 10⁻³, 10⁻²

B) 10¹, 10², 10³

C) 10³, 10², 10¹

D) 10⁻³, 10⁻², 10⁻¹

14 / 30

Which number is equivalent to 1.0 × 10⁰?

A) 1

B) 100

C) 10

D) 0

15 / 30

Which scientific notation is correct for 0.000001?

A) 1 × 10⁻⁵

B) 10 × 10⁻⁶

C) 1 × 10⁻⁷

D) 1 × 10⁻⁶

16 / 30

Which statement is true?

A) Coefficient can be any number

B) Negative exponent means large number

C) Positive exponent means small number

D) Scientific notation always uses base 10

17 / 30

Which is NOT correctly expressed?

A) 1.2 × 10³

B) 12.5 × 10²

C) 3 × 10⁴

D) 9.8 × 10⁻²

18 / 30

Which is the correct form of 98000?

A) 0.98 × 10⁵

B) 9.8 × 10⁴

C) All of these are correct

D) 98 × 10³

19 / 30

Why must coefficient be between 1 and 10?

A) To standardize representation

B) To avoid units

C) To increase value

D) To remove exponent

20 / 30

Which is larger?

A) 9 × 10⁵

B) 3 × 10⁶

C) 8 × 10⁴

D) 1 × 10⁷

21 / 30

4.0 × 10³ × 2.0 × 10² equals:

A) 6 × 10⁵

B) 8 × 10⁶

C) 8 × 10⁵

D) 6 × 10⁶

22 / 30

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

23 / 30

10⁴ ÷ 10² equals:

A) 10⁴

B) 10⁶

C) 10²

D) 10⁻²

24 / 30

Which number is closest to scientific form?

A) 450 × 10¹

B) 0.45 × 10⁴

C) 45 × 10²

D) 4.5 × 10³

25 / 30

A very large astronomical distance is best expressed using:

A) decimal form

B) fraction form

C) percentage form

D) scientific notation

26 / 30

Which is correct conversion of 0.00032?

A) 0.32 × 10⁻³

B) 32 × 10⁻⁵

C) 3.2 × 10⁻⁴

D) 3.2 × 10⁻³

27 / 30

Which expression shows correct application in physics?

A) Time = 2 × 10⁻³ m

B) Mass = 5 × 10² kg

C) Force = 4 × 10⁻² s

D) Speed = 3 × 10² kg

28 / 30

Which number is greater?

A) 10⁻²

B) 10⁻¹

C) 10⁻³

D) 10⁻⁴

29 / 30

Scientific notation mainly helps in:

A) Removing calculations

B) Increasing measurement error

C) Handling extreme values easily

D) Avoiding units

30 / 30

Which is correctly written scientific notation for 1500000?

A) 1.5 × 10⁶

B) All of these

C) 0.15 × 10⁷

D) 15 × 10⁵

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