Physics Measurements and Experimentation Exercise1b
Please Select
Q1 Explain the meaning of the term ‘least count of an instrument’ by taking a suitable example.
Q2 A boy makes a ruler with graduation in cm on it (i.e., 100 divisions in 1m). To what accuracy this ruler can measure? How can this accuracy be increased?
Q3 A boy measures the length of a pencil and expresses it to be 2.6cm. What is the accuracy of his measurement? Can he write it as 2.60cm?
Q4 Define least count of a venier calipers. How do you determine it?
Q5 Define the term ‘Vernier constant’.
Q6 When is a vernier calipers said to be free from zero error?
Q7 What is meant by zero error of a vernier calipers? How is it determined? Draw neat diagrams to explain it. How is it taken in account to get the correct measurement?
Q8 A vernier callipers has a zero error +0.06cm. Draw a neat labelled diagram to represent it
Q9 Draw a neat labelled diagram of a vernier callipers. Name its main parts and state their functions
Q10 State three uses of a vernier calipers.
Q11 Name the two scales of a vernier callipers and explain, how it is used to measure a length correct up to 0.01cm.
Q12 Describe in steps, how would you use a vernier calipers to measure the length of a small rod?
Q13 Name the part of the vernier calipers which is used to measure the following:
(a) External diameter of a tube
(b) Internal diameter of a mug
(c) Depth of a small bottle
(d) Thickness of a pencil
Q14 Explain the terms (i) pitch, and (ii) least count of a screw gauge. How are they determined?
Q15 How can the least count of a screw gauge be decreased?
Q16 Draw a neat labelled diagram of a screw gauge. Name its main parts and state their functions.
Q17 State one use of a screw gauge.
Q18 State the purpose of ratchet in a screw gauge.
Q19 What do you mean by zero error of a screw gauge? How is it accounted for?
Q20 A screw gauge has a least count 0.001cm and zero error + 0.007cm. Draw a neat diagram to represent it.
Q21 What is backlash error? Why is it caused? How is it avoided?
Q22 Describe the procedure to measure the diameter of a wire with the help of a screw gauge.
Q23 Name the instrument which can measure accurately the following:
(a) The diameter of a needle
(b) The thickness of a paper
(c) The internal diameter of the neck of a water bottle
(d) The diameter of a pencil
Q24 Which of the following measures a small length to a high accuracy: metre rule, vernier calipers, screw gauge?
Q25 Name the instrument which has the least count:
(a) 0.1mm
(b) 1mm
(c) 0.01mm
Multiple Choice type Questions :
Q1 The least count of a vernier calipers is:
(a) 1cm
(b) 0.001cm
(c) 0.1cm
(d) 0.01cm
Q2 A microscope has its main scale with 20 divisions in 1cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is:
(a) 0.002cm
(b) 0.001cm
(c) 0.02cm
(d) 0.01cm
Q3 The diameter of a thin wire can be measured by:
(a) A vernier calipers
(b) A metre rule
(c) A screw gauge
(d) None of these
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