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Published on: 04/03/2019
Measurement and Measuring Instruments Important Questions
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.
_________is the unit of distance used to measure astronomical objects outside the solar system.
Parsec
km
cm
litre
2.
With the help of common beam balance we can measure mass accurately up to_________gm.
2 gms
5 gms
100 gms
20 gms
3.
1 quintal is equal to_______kg.
100
200
1000
10
4.
Light travels________m in one second.
5 x 103
5 x 108
3 x 108
8 x 103
5.
The unit of area is_________.
m3
m
m2
\(\frac{m}{s}\)
6.
There are___________fundamental units in SI system of units.
7
4
6
5
7.
Unit of time is_________.
km
mm
second
cm
8.
___________is the derived quantity.
Length
Volume
Mass
Time
9.
Which among the following is not a device to measure mass?
Spring balance
Beam balance
Physical balance
Digital balance
10.
Rulers, measuring tapes and metre scales are used to measure
Mass
Weight
Time
Length
11.
Define length.
12.
In which part of the Vernier caliper is used to measure the internal diameter of a cylindrical pipe?
13.
Calculate the correct readings of the Vernier caliper L.C. 0.01 cm Zero correction - Nil.
| S.No. | M.S.R | V.C | Observed Reading = M.S.R + (V.C x L.C) | Correct Reading |
| 1 | 3 | 4 | ||
| 2 | 3 | 7 |
14.
Convert: 104°F into Celsius scale.
15.
What is the full form of SI system?
16.
The Main scale reading is 3.8 Vernier scale coincidence = 5th division. No zero error. Find the length of the iron cylinder.
17.
The mass of an object is 5 kg. What is its weight on the earth?
18.
Copy and complete the table.
| Measurement | Unit | Symbol |
| Length | ---- | --- |
| -- | Kilogram | -- |
| -- | -- | S |
19.
How will you measure the least count of vernier caliper?
20.
Write the need of a standard unit.
21.
Find the diameter of a thin wire using screw gauge.
22.
Explain a method to find the thickness of a hollow tea cup.
23.
The diameter of spherical objects can be measured with___________.
24.
1 metric tonne is equal to________kg.
25.
JS-1 is the unit of__________.
26.
The smallest amount of time imaginable to us is a twinkling of eye is called_________.
27.
Length, mass and time are called__________.
1.
(a)
Parsec
2.
(b)
5 gms
3.
(a)
100
4.
(c)
3 x 108
5.
(c)
m2
6.
(a)
7
7.
(c)
second
8.
(b)
Volume
9.
(a)
Spring balance
10.
(d)
Length
11.
Length is defined as the distance between two points. The SI unit of length is metre.
12.
Upper jaws.
13.
| S.No. | M.S.R | V.C | Observed Reading = M.S.R + (V.C x L.C) | Correct Reading |
| 1 | 3 | 4 | 3 + (4 x 0.01) | 3.04 |
| 2 | 3 | 7 | 3 + (7 x 0.01) | 3.07 6.11 ____ 2 |
Correct reading = 3.55 cms.
14.
Celsius = (F – 32) × \(\frac{5}{9}\)= (104 - 32) ×\(\frac{5}{9}\) = 72 × \(\frac{5}{9}\) = 40°C.
15.
Full form of SI system is "International system of units"
16.
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
17.
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
18.
| Measurement | Unit | Symbol |
| Length | Metre | m |
| Mass | Kilogram | kg |
| Time | Second | S |
19.
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.
\( \text { Least count } =\frac{\text { The value of one smallest main scale division }}{\text { Totalnumber of vernier scale division }}\)
\( \\ \text { L.C } =\frac{1 \mathrm{~mm}}{10}=0.1 \mathrm{~mm}=0.01 \mathrm{~cm}\)
20.
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.
21.
(i) Determine the pitch, the least count and the zero error of the screw gauge.
(ii) Place the wire between the two slides.
(iii) Rotate the head until the wire is held firmly but not tightly with the help of ratchet.
(iv) Note the P.S.R and H.S.R
(v) The diameter of the wire is given by
P.S.R + (H.S.C x L.C) ± Z.C,
(vi) Repeat the experiment for different portions of the wire.
(vii) Tabulate the readings.
(viii) The average of the last column reading gives the diameter of the wire.
| S.No. | P.S.R | H.S.C | H.S.C x L.C (mm) | Total Reading PSR + (HSC x LC) ± Z.C mm |
| 1. | ||||
| 2. | ||||
| 3. |
(ix) The average gives the correct reading.
22.
Finding the outer diameter of the tea cup:
1. Place the tea cup between the outside jaws.
2. Note the reading of main scale and vernier coincidence. Tabulate the readings.
3. The outer diameter of the tea cup is calculated by MSR + (VC x LC).
4. Repeat the experiment and find the average diameter.
Finding the inner diameter of the tea cup:
1. Place the tea cup between the inside jaws.
2. Note the reading of main scale and vernier coincidence.
3. Tabulate the readings.
4. The inner diameter of the tea cup is calculated by MSR + (VC x LC).
5. Repeat the experiment and find the average diameter.
| S.No | MSR | VSC | MSR + (VC x LC) ± ZC | |
| 1. 2. 3. |
Outer diameter | |||
| 1. 2. 3. |
Inner diameter |
The thickness of tea cup = outer reading - inner reading = __________ mm
23.
( )
Vernier Caliper
24.
( )
1000
25.
( )
Power
26.
( )
atomus
27.
( )
Fundamental units
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
