Practice MCQs for Class 9 Physics Units and Measurements
Explore reliable objective questions for Units and Measurements tailored for Class 9 learners. Utilizing these Physics multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.
Access Units and Measurements Questions and Solutions
Access the complete set of multiple-choice questions for Units and Measurements below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.
Multiple Choice Questions
(a) Amount of substance
(b) Heat
(c) Electric current
(d) Time
Show Answer & Explanation
Answer: (b) Heat
Explanation:
1. Amount of substance, electric current and time are base quantities. Heat is a form of energy, a derived quantity.
Teacher's Note:
1. Energy is derived from mass, length and time.
2. The base quantities are seven in number.
(a) SI
(b) MKS
(c) FPS
(d) CGS
Show Answer & Explanation
Answer: (a) SI
Explanation:
1. MKS, FPS and CGS use only units of mass, length and time.
2. The SI also has base units for temperature, amount of substance, electric current and luminous intensity.
Teacher's Note:
1. SI has seven base units.
2. MKS is a subset of SI for mechanics.
(a) 10⁶
(b) 10⁵
(c) 10⁻⁶
(d) 10⁻⁵
Show Answer & Explanation
Answer: (b) 10⁵
Explanation:
1. 1 microfarad = 10⁻⁶ farad, so 1 farad = 10⁶ microfarads.
2. 0.1 farad = 0.1 x 10⁶ = 10⁵ microfarads.
Teacher's Note:
1. Micro means 10⁻⁶.
2. Divide by the prefix factor to change to the smaller unit.
(a) 0.2%
(b) 0.4%
(c) 0.02%
(d) 0.002%
Show Answer & Explanation
Answer: (a) 0.2%
Explanation:
1. Least count = 1 mm = 0.1 cm.
2. Percentage error = \( \dfrac{0.1}{50} \times 100 = 0.2\% \).
Teacher's Note:
1. The least count is the possible uncertainty.
2. A longer length gives a smaller percentage error.
(a) velocity
(b) force
(c) acceleration
(d) none of these
Show Answer & Explanation
Answer: (c) acceleration
Explanation:
1. N kg⁻¹ = (kg m s⁻²)/kg = m s⁻², the unit of acceleration.
Teacher's Note:
1. Force per unit mass is acceleration.
2. Check by writing newton in base units.
(a) four
(b) one
(c) three
(d) five
Show Answer & Explanation
Answer: (c) three
Explanation:
1. In the British system 12 inches = 1 foot and 3 feet = 1 yard.
Teacher's Note:
1. 1 yard is about 0.9 m.
2. 1 foot is about 30.5 cm.
(a) liksha
(b) parmanu
(c) rajahkan
(d) yavamadhya
Show Answer & Explanation
Answer: (b) parmanu
Explanation:
1. The ancient system began with the parmanu, the smallest unit. 8 parmanu made 1 rajahkan, 8 rajahkan made 1 liksha, and so on up to the yojana.
Teacher's Note:
1. The yojana was the largest unit, about 10 km.
2. Each step in the ancient scale multiplied by 8.
(a) kg m⁻¹
(b) kg m⁻³
(c) kg m⁻²
(d) kg
Show Answer & Explanation
Answer: (b) kg m⁻³
Explanation:
1. Density = mass / volume = kg / m³ = kg m⁻³.
Teacher's Note:
1. Volume has the unit m³.
2. Water has a density of 1000 kg m⁻³.
(a) giga
(b) exa
(c) tera
(d) peta
Show Answer & Explanation
Answer: (b) exa
Explanation:
1. giga = 10⁹, tera = 10¹², peta = 10¹⁵ and exa = 10¹⁸.
Teacher's Note:
1. Each step in this list multiplies by 1000.
2. Exa is the largest listed.
(a) 157 pm
(b) 1.57 pm
(c) 15.7 pm
(d) 1570 pm
Show Answer & Explanation
Answer: (a) 157 pm
Explanation:
1. 1 pm = 10⁻¹² m.
2. \( \dfrac{1.57 \times 10^{-10}}{10^{-12}} = 157 \) pm.
Teacher's Note:
1. Pico means 10⁻¹².
2. This is a hundred times larger than 1.57 pm.
(a) 0.6%
(b) 6%
(c) 0.02%
(d) 2%
Show Answer & Explanation
Answer: (a) 0.6%
Explanation:
1. Percentage uncertainty = \( \dfrac{0.02}{3.56} \times 100 = 0.56\% \approx 0.6\% \).
Teacher's Note:
1. Divide the uncertainty by the measured value.
2. Multiply by 100 to get a percentage.
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Units and Measurements Objective Questions & Solutions for Class 9 Physics
Download Multiple Choice Questions: Units and Measurements (Class 9 Physics)
Test your conceptual understanding of Units and Measurements with these targeted multiple-choice questions. Designed in alignment with the latest CBSE curriculum for Class 9 Physics, these problem sets build accuracy and prepare students for objective exams.
Concept Clarification for Units and Measurements
Each question includes structured solution keys mapped directly to standard CBSE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.
Additional Study Resources for Class 9 Physics
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FAQs
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By solving our CBSE Class 9 Physics Units and Measurements MCQs Set 14, Class 9 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Physics.
Yes, Physics MCQs for Class 9 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.
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