Tamil Nadu
Matriculation Board
Class IX: Physics |
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Chapter 1: Measurements
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Very Short
Answer Questions:
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Q1.What
is I.S.I?
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Q2.What
are the three basic quantities in measurement?
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Q3.What
is the basic principle of the screw gauge?
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Q4.Define
pitch of the screw gauge.
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Q5.Define
least count of a screw gauge.
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Q6.What
is zero error in screw gauge?
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Q7.What
instruments are generally used in the lab for accurate measurement of mass, length and
time?
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Q8.What
is a simple pendulum? Define time period of a pendulum.
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Q9.
What are the three basic units for measurement of fundamental quantities in the S.I
system?
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Q10.When
did the importance of quality of goods emerge?
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Q11.How
can we know if the goods we are buying are of proper standard?
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Q12.How
can you measure approximately the thickness of a sheet of paper from a bundle of identical
sheets?
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Q13.What
are the two factors, which determine the choice of the instrument you will use for
measurement?
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Q14.What
is the least count of the meter scale and the vernier calipers?
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Q15.Name
three instruments, which can measure length with great accuracy.
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Q16.In
a screw gauge what is a) pitch scale b) axial line.
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Q17.What
is the function of the ratchet in the screw gauge?
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Q18.Give
the formula for least count (L.C) for the screw gauge.
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Q19.When
is a screw gauge said to have negative zero error?
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Q20.When
is a screw gauge said to have a positive zero error?
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Q21.What
is the use of the plumb line in the physical balance?
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Q22.Name
the two scales in the screw gauge.
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Q23.Define
one second.
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Q24.What
do you understand by fundamental units?
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| Q25.What
is the use of a physical balance?
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Short
Answer Questions:
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Q1.Explain
the principle of the screw gauge. Define a) pitch b) least count c) zero error.
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Q2.Explain
how you can determine the pitch of a screw gauge.
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Q3.How
will you determine the least count of a screw gauge.
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Q4.What
is zero error? Explain the two types of zero error.
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Q5.How
can you correct for zero error in the screw gauge?
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Q6.For
a simple pendulum define a) effective length b) oscillation c) amplitude d) time period e)
frequency of oscillation.
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Q7.Describe
the construction of the screw gauge.
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Q8.How
will you set up a simple pendulum to find the time period of oscillation for a length of
say 100 cm?
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Q9.Explain
how the need for quality of goods arose. What is I.S.I?
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Q10.What
are fundamental quantities and fundamental units?
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Q11.Describe
how you can determine the radius of lead shots using a screw gauge. How will you calculate
the volume?
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Q12.What
does a physical balance measure? Define a) turning point b) resting point c) zero resting
point.
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Q13.What
are the precautions to be observed while weighing in the physical balance?
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Q14.
The pitch of a screw is 1 mm and the head scale has 100 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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Q15.With
the pans empty the turning points of a balance are 4,17,5,16 and 5. With the glass stopper
on the left hand pan and 10.25 Gms on the right hand pan the turning points are 4,19,4,18
and 4.When 10 mg is added to the right hand pan the turning points are 3,18,3,18 and 3.
Find correct mass of stopper.
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Q16.Describe
the physical balance.
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Q17.How
will you find the mass of a body using a physical balance?
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Q18.What
are the rules and conventions in the use of symbols in the S.I units?
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Q19.What
is measurement? What is error and what are the possible errors that occur in the course of
an experiment?
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Q20.What
is back- lash error in a screw gauge? How can we minimize it? The pitch of a screw is 0.5mm and the head scale is divided into 50 equal parts. What is
the least count of the screw gauge?
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Solution |
