SI (Metric) Prefixes Class 11 CBSE-Questions, Answers, MCQs, FAQs & Worksheet

Complete Study Material for JEE, NEET, CBSE Board Class 11 Exams

Introduction

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Understanding S.I. Prefixes in Physics

In physics, we deal with measurements ranging from the microscopic scale (such as atomic structure) to the macroscopic scale (such as the universe). The standard prefixes help express these values efficiently.

What are S.I. Prefixes?

A: In physics, we deal with extremely small (micro) and extremely large (macro) magnitudes, such as the mass of an electron (9.1 × 10⁻³¹ kg) and the mass of the Sun (2 × 10³⁰ kg). To conveniently express such values, S.I. prefixes are used.

List of S.I. Prefixes

Power of 10	Prefix	Symbol
10ⁱ⁸	exa	E
10ⁱ⁵	peta	P
10ⁱ²	tera	T
10⁹	giga	G
10⁶	mega	M
10³	kilo	k
10²	hecto	h
10¹	deca	da
10⁻¹	deci	d
10⁻²	centi	c
10⁻³	milli	m
10⁻⁶	micro	μ
10⁻⁹	nano	n
10⁻¹²	pico	p
10⁻¹⁵	femto	f
10⁻¹⁸	atto	a

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Multiple Choice Questions (MCQs) with Answers & Explanations

Q1: What is the S.I. prefix for 10⁹?

A) Tera
B) Giga
C) Mega
D) Peta

Answer: B) Giga
Explanation: The prefix Giga (G) is used for 10⁹.

Q2: Which of the following is the correct symbol for micro?

A) μ
B) m
C) n
D) p

Answer: A) μ
Explanation: Micro is represented by the symbol μ and corresponds to 10⁻⁶.

Q3: What is the prefix for 10¹²?

A) Giga
B) Tera
C) Peta
D) Mega

Answer: B) Tera
Explanation: Tera (T) is used for 10¹².

Q4: Which prefix represents 10⁻³?

A) Milli
B) Micro
C) Centi
D) Deci

Answer: A) Milli
Explanation: Milli (m) corresponds to 10⁻³.

Q5: The prefix femto (f) corresponds to which power of 10?

A) 10⁻⁹
B) 10⁻¹²
C) 10⁻¹⁵
D) 10⁻¹⁸

Answer: C) 10⁻¹⁵
Explanation: Femto (f) represents 10⁻¹⁵.

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Worksheet on S.I. Prefixes

Q1: Define S.I. prefixes and explain why they are important in physics.
Q2: Convert the following values into standard S.I. notation:

• 5 gigabytes to bytes
• 3 millimeters to meters
• 200 nanoseconds to seconds
• 7 terawatts to watts

Q3: What is the difference between the prefixes centi, milli, and micro?
Q4: Explain why S.I. prefixes are essential in scientific notation.

Q5 : Write the symbols for the following prefixes:

• (a) Femto
• (b) Deca
• (c) Nano
• (d) Mega

Q6: Convert the following into base units:

• (a) 5 km to meters
• (b) 3 μm to meters
• (c) 10⁶ g to kilograms

Q7 : Fill in the blanks:

• (a) The prefix for 10⁻¹² is ___.
• (b) 1 hectogram = ___ grams.
• (c) The symbol for deci is ___.

For comprehensive study materials, worksheets, and practice questions for JEE, NEET, and CBSE Board Class 11 exams, visit Anand Technical Publishers.

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Frequently Asked Questions (FAQs) on S.I. Prefixes

Q1: Why do we use S.I. prefixes?

A: S.I. prefixes simplify the expression of very large and very small numbers, making calculations and communication in science easier.

Q2: How do we convert between S.I. prefixes?

A: To convert between prefixes, multiply or divide by powers of ten. Example: 1 km = 1000 m = 10³ m.

Q3: What is the smallest S.I. prefix in common use?

A: The smallest commonly used prefix is atto (a) = 10⁻¹⁸.

Q4: Why is the symbol for micro (μ) different from other symbols?

A: The Greek letter μ is used for micro because ‘m’ is already assigned to milli (10⁻³).

Q5: What is the prefix for 10⁹?

A: The prefix for 10⁹ is Giga (G).

Q6: Which prefix represents 10⁻³?

A: The prefix for 10⁻³ is Milli (m).

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