Tamil Nadu
Matriculation Board
Class IX: Physics |
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Chapter 1: Measurements
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Essay
Answer Questions:
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Q1. a) Describe the
principle and construction of a screw gauge.
b) In a screw gauge what is back- lash error and how will you minimize it?
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Q2. Describe the
physical balance. What precautions will you take while weighing in a physical balance?
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Q3. a) Describe how
you will find the mass of a body using a physical balance
b) Define turning points, resting point and zero resting point in a physical balance.
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Q4. a) What is zero
error? How is it determined and corrected?
b) How
will you determine the diameter of a wire using a screw gauge?
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Q5. a) Define a)
oscillation b) time period c) effective length d) amplitude and frequency of oscillation
for a simple pendulum.
b) Describe a method to find the period of oscillation of a simple pendulum.
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Q6. a) How will you
adjust the effective length of a simple pendulum?
b) In a laboratory experiment, a pendulum of length 80.4 cm is found to complete 50
oscillations in 90 seconds. Calculate the acceleration due to gravity in the lab.
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Q7. How will you
determine the least count and pitch of a screw gauge?
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Q8. a) What is
measurement? What is error in measurement? Discuss the types of errors.
b) Explain why the need for quality of goods arose? What is I.S.I?
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Q9. a) What are the
conventions of using SI units?
b) Explain how you will determine the diameter of given lead shots using a screw gauge.
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Q10. a) What are
fundamental quantities and fundamental units?
b) The pitch of a screw is 1 mm and the head scale has 50 divisions. In measuring the
diameter of a wire the pitch reads 2 mm and the 40 th division of the head
scale coincides with the reference line. Find the L.C and radius of the wire.
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Solution |
