MEASUREMENTS AND EXPERIMENTATION
CLASS 9
WORKSHEET
Define light year.
Define atomic mass unit.
Define a parsec.
Express the distance from the earth to sun in (i) parsec and (ii) light year.
Name the basic units of SI system used for measuring all the physical quantities.
Compute the number of seconds in a (i) day and (ii)year.
What is a unit? Explain the process of measuring a physical quantity.
Derive the SI unit of work done. What is the other name of this unit?
How many quintals are there in a gigagram?
How many times a kg is larger than a mg?
Give the approximate value of ratio of 1AU and 1light year.
Calculate the number of light years in one metre.
What is vernier constant?
What is the function of the sliding strip in the vernier callipers?
The least count of metre scale - 1mm, vernier callipers - 0.1mm, screw gauge
-0.01m. Which has the least accuracy?
16) A student used a vernier calliper to measure the length of a pencil. He found that
the main scale showed a reading of 8.3 and vernier scale coincides with 5th
position to the main scale. What is the correct measurement of the length of the
pencil?
17) A vernier calliper was used to find out the diameter of can. What is the
measurement of it from the below picture?
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18) What is the principle of a vernier calliper?
19) The jaws of the Vernier callipers shown in figure are in contact with each other.
Find the nature and magnitude of zero error of this Vernier callipers.
20) Below are the pictures given of an object kept between the jaws of vernier calliper
and when both jaws are closed. Calculate the thickness of the object.