physics - units and measurement

Class 11 - Physics

Units and Measurement

Q&A
Question:

The vernier scale of a travelling microscope has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, calculate the minimum inaccuracy in the measurement of distance.
Thinking Process
Inaccuracy will be measured by difference of 1 MSD and 1VSD, where MSD = mam scale division and VSD = verneir scale division.

Answer:

ncert-solutions-for-class-11-physics-chapter-1-units-and-measurements-saq4



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Questions and Answers


Units and Measurement - Questions
3.

The length and breadth of a rectangular sheet are 16.2 cm and 10.1 cm, respectively. The area of the sheet in appropriate significant figures and error is
(a) 164 ± 3 cm2 (b) 163.621 2.6 cm2 (c) 163.61 2.6 cm2 (d) 163.621 3 cm2


Answer
5.

Why length, mass and time are chosen as base quantities in mechanics?


Answer
6.

The vernier scale of a travelling microscope has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, calculate the minimum inaccuracy in the measurement of distance.
Thinking Process
Inaccuracy will be measured by difference of 1 MSD and 1VSD, where MSD = mam scale division and VSD = verneir scale division.


Answer
11.

The radius of atom is of the order of 1 A and radius of nucleus is of the order of fermi. How many magnitudes higher is the volume of atom as compared to the volume of nucleus?


Answer
12.

Name the device used for measuring the mass of atoms and molecules.


Answer
13.

(a) The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
(b) Moon is seen to be of (1/2) ° diameter from the earth. What must be the relative size compared to the earth?
(c) Fronj parallax measurement, the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth diameters.


Answer
14.

Express unified atomic mass unit in kg.


Answer
15.

(a) The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
(b) Moon is seen to be of (1/2) ° diameter from the earth. What must be the relative size compared to the earth?
(c) Fronj parallax measurement, the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth diameters.


Answer
16.

Why do we have different units for the same physical quantity?


Answer
17.

Which of the following time measuring devices is more precise?
(a) A wall clock (b) A stop Watch (c) A digital watch (d) An atomic clock


Answer
18.

Which of the following measurement is most precise?
(a) 5.00 mm (b) 5.00 cm (c) 5.00 m (d) 5.00 km


Answer
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