9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Published on: 04/10/2019
Term 1 Measurement and Measuring Instruments
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
The Main scale reading is 3.8 Vernier scale coincidence = 5th division. No zero error. Find the length of the iron cylinder.
2.
While measuring the diameter of an iron nail using a screw gauge, the reading on the pitch scale is found to be 1.5 mm and the head scale reading is 20. If the least count is 0.01 mm and the zero error is + 0.05 mm, find the diameter of the iron nail.
3.
The mass of an object is 5 kg. What is its weight on the earth?
4.
Copy and complete the table.
| Measurement | Unit | Symbol |
| Length | ---- | --- |
| -- | Kilogram | -- |
| -- | -- | S |
5.
What are the fundamental physical quantities and their units?
6.
How will you measure the least count of vernier caliper?
7.
What is the measuring unit of the thickness of a plastic carry bag?
8.
Differentiate mass and weight.
9.
Write the need of a standard unit.
10.
Write the rules that are followed in writing the symbols of units in SI system.
1.
M.S. reading = 3.8 cm
V.S.R = 5th division
least count = 0.01 cm
Length = P.S.R + (V.S.C x L.C)
= 3.8 + (5 x 0.01) = 3.8 + 0.05 = 3.85
Length of the iron cylinder = 3.85 cm
2.
Given: P.S.R = 1.5 mm, H.S.R = 20 ; L.C = 0.01 mm
Z.E = + 0.05 mm ; Zero correction = - 0.05 mm
Diameter of iron nail = P.S.R + (H.S.R + L.C) + Z.C
= 1.5 + (20 x 0.01) - 0.05
= 1.5 + 0.20 - 0.05 = 1.65 mm
Diameter of iron nail = 1.65 mm
3.
Mass m = 5 kg
Acceleration due to gravity g = 9.8 ms-1
Weight W = m x g = 5 x 9.8 = 49 N
Therefore the weight of an object is 49 N
4.
| Measurement | Unit | Symbol |
| Length | Metre | m |
| Mass | Kilogram | kg |
| Time | Second | S |
5.
| Fundamental quantities | Unit | Symbol |
| Length | metre | m |
| Mass | kilogram | kg |
| Time | second | s |
| Temperature | kelvin | K |
| Electric current | ampere | A |
| Luminous intensity | candela | cd |
| Amount of substance | mole | mol |
6.
The value is one smallest main scale division is divided by total number of vernier scale division is called the least count of vernier caliper.
\( \text { Least count } =\frac{\text { The value of one smallest main scale division }}{\text { Totalnumber of vernier scale division }}\)
\( \\ \text { L.C } =\frac{1 \mathrm{~mm}}{10}=0.1 \mathrm{~mm}=0.01 \mathrm{~cm}\)
7.
The measuring unit of the thickness of a plastic carry bag is micron.
8.
| Mass | Weight |
| 1. Fundamental quantity | Derived quantity |
| 2. It is a scalar quantity | It is a vector quantity |
| 3. The amount of matter contained in a body |
Normal source exerted by the surface on the object against gravitational pull |
| 4. It remains the same | Varies from place to place. |
| 5. Its unit is kilogram | Its unit is newton. |
9.
i) Standard units give the correct and accurate measurement like length, mass, time etc...
ii) It is not varied from person to person, place to place and object to object. So we need standard unit.
10.
1. The units named after scientists are not written with a capital intial letter.
Ex: newton, henry, ampere and watt
2. The symbols of units named after scientists should be written by the initial capital letter.
Ex: N for newton, H for henry, A for ampere and W for watt.
3. Small letters are used as symbols for units not derived from a proper noun.
Ex: m for metre, kg for kilogram
4. No full stop or other punctuation marks should be used within or at the end of the symbols.
Ex: 50 m and not as 50 m.
5. The symbols of the units are not expressed in plural form.
Ex: 10 kg not as 10 kgs.
6. Accepted symbols should only be used.
Ex: ampere should not be written as amp and second should not be written as sec.
9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
