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 of length is metre (m). Kilogram, second, and ampere are units of mass, time, and electric current respectively.

Q: Which instrument is commonly used to measure the length of a small object accurately?

Answer: B. Vernier calipers — Vernier calipers are used to measure small lengths accurately. The other instruments are used for temperature, pressure, and time.

Q: A scientist measures the length of a table using a metre scale. Which precaution helps reduce error?

Answer: B. Place the eye vertically above the mark — Keeping the eye vertically above the mark avoids parallax error. Reading from an angle can give a wrong measurement.

Q: A wooden ruler has its zero mark slightly damaged. If length is measured starting from the worn zero mark, what kind of error is likely to occur?

Answer: C. Zero error — When the zero mark is damaged or incorrect, the instrument gives zero error. This affects all readings by a fixed amount.

Q: Which of the following combinations is correctly matched?

Answer: C. Length - vernier calipers — Vernier calipers are used to measure length accurately, especially small dimensions. The other instrument-object pairs are incorrect.

SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-1 Measurement with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE. This chapter covers: Description Explains units measuring instruments accuracy and errors in scientific measurement Keywords Units Measurement Instruments Accuracy Errors. 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 9th 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. Kilogram
C. Second
D. Ampere

Answer: A. Metre
The SI unit of length is metre (m). Kilogram, second, and ampere are units of mass, time, and electric current respectively.

Which instrument is commonly used to measure the length of a small object accurately?

A. Thermometer
B. Vernier calipers ✓
C. Barometer
D. Stopwatch

Answer: B. Vernier calipers
Vernier calipers are used to measure small lengths accurately. The other instruments are used for temperature, pressure, and time.

A scientist measures the length of a table using a metre scale. Which precaution helps reduce error?

A. Read the scale from an angle
B. Place the eye vertically above the mark ✓
C. Use a broken scale
D. Start measuring from the middle of the scale

Answer: B. Place the eye vertically above the mark
Keeping the eye vertically above the mark avoids parallax error. Reading from an angle can give a wrong measurement.

A wooden ruler has its zero mark slightly damaged. If length is measured starting from the worn zero mark, what kind of error is likely to occur?

A. No error
B. Parallax error
C. Zero error ✓
D. Random error

Answer: C. Zero error
When the zero mark is damaged or incorrect, the instrument gives zero error. This affects all readings by a fixed amount.

Which of the following combinations is correctly matched?

A. Mass - metre scale
B. Temperature - balance
C. Length - vernier calipers ✓
D. Time - measuring cylinder

Answer: C. Length - vernier calipers
Vernier calipers are used to measure length accurately, especially small dimensions. The other instrument-object pairs are incorrect.

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Chapter-2 Motion