Chapter Exam

Chapter-1 Measurement — Online MCQ Test

Q: Which of the following is the SI unit of length?

Answer: A. metre — The SI unit used to measure length is metre (m). Litre measures volume, gram measures mass, and second measures time.

Q: The instrument commonly used to measure the length of a straight line is a ____.

Answer: B. metre scale — A metre scale is used for measuring lengths directly. The other instruments are used for temperature, volume, and time respectively.

Q: A student measures the length of a pencil as 12.3 cm. The last digit in this measurement indicates the ____.

Answer: B. estimated value — In any measurement, the last digit is an estimated digit. This helps show the accuracy of the measurement.

Q: A student uses a measuring tape to measure the length of a table. Which precaution will improve accuracy?

Answer: C. Keep the tape straight and align it properly — Keeping the tape straight and properly aligned gives a more accurate measurement. Measuring from a non-zero mark or reading at an angle causes errors.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-1 Measurement with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: units accuracy measurement tools Explains units accuracy and instruments used for measuring physical quantities. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-1 Measurement — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-1 Measurement, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the SI unit of length?

A. metre ✓
B. litre
C. gram
D. second

Answer: A. metre
The SI unit used to measure length is metre (m). Litre measures volume, gram measures mass, and second measures time.

The instrument commonly used to measure the length of a straight line is a ____.

A. thermometer
B. metre scale ✓
C. beaker
D. stopwatch

Answer: B. metre scale
A metre scale is used for measuring lengths directly. The other instruments are used for temperature, volume, and time respectively.

A student measures the length of a pencil as 12.3 cm. The last digit in this measurement indicates the ____.

A. exact value only
B. estimated value ✓
C. unit value
D. zero error

Answer: B. estimated value
In any measurement, the last digit is an estimated digit. This helps show the accuracy of the measurement.

A student uses a measuring tape to measure the length of a table. Which precaution will improve accuracy?

A. Keep the tape loose and curved
B. Start measuring from the 1 cm mark
C. Keep the tape straight and align it properly ✓
D. Read the scale from an angle

Answer: C. Keep the tape straight and align it properly
Keeping the tape straight and properly aligned gives a more accurate measurement. Measuring from a non-zero mark or reading at an angle causes errors.

A student measures the length of a book as 24.0 cm. Which conclusion is most appropriate?

A. The measurement has three significant digits and includes an estimated digit ✓
B. The measurement is less accurate than 24 cm
C. The zero is not part of the measurement
D. The book length is exactly 24 cm

Answer: A. The measurement has three significant digits and includes an estimated digit
The value 24.0 cm shows that the measurement is recorded up to one decimal place, indicating an estimated digit. It also reflects better precision than writing only 24 cm.

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Chapter-2 Forces and Pressure