{"id":22445,"date":"2025-01-02T11:00:40","date_gmt":"2025-01-02T05:30:40","guid":{"rendered":"https:\/\/samacheerkalvi.guide\/?p=22445"},"modified":"2025-01-03T10:09:22","modified_gmt":"2025-01-03T04:39:22","slug":"samacheer-kalvi-9th-science-guide-chapter-1","status":"publish","type":"post","link":"https:\/\/samacheerkalvi.guide\/samacheer-kalvi-9th-science-guide-chapter-1\/","title":{"rendered":"Samacheer Kalvi 9th Science Guide Chapter 1 Measurement"},"content":{"rendered":"

Tamilnadu State Board New Syllabus Samacheer Kalvi 9th Science Guide<\/a> Pdf Chapter 1 Measurement Text Book Back Questions and Answers, Notes.<\/p>\n

Tamilnadu Samacheer Kalvi 9th Science Solutions Chapter 1 Measurement<\/h2>\n

9th Science Guide Measurement Text Book Back Questions and Answers<\/h3>\n

\"Samacheer<\/p>\n

I. Choose the correct answer :<\/span><\/p>\n

Question 1.
\nChoose the correct one.
\n(a) mm < cm < m < km
\n(b) mm > cm > m > km
\n(c) km < m < cm < mm
\nd) mm > m > cm > km
\nAnswer :
\n(a) mm < cm < m < km<\/p>\n

Question 2.
\nRulers, measuring tapes and metre scales are used to measure
\n(a) mass
\n(b) weight
\n(c) time
\n(d) length
\nAnswer:
\n(d) length<\/p>\n

\"Samacheer<\/p>\n

Question 3.
\n1 metric ton is equal to
\n(a) 100 quintals
\n(b) 10 quintals
\n(c) 1\/10 quintals
\n(d) 1\/100 quintals
\nAnswer :
\n(b) 10 quintals<\/p>\n

Question 4.
\nWhich among the following is not a device to measure mass?
\n(a) Spring balance
\n(b) Beam balance
\n(c) Physical balance
\n(d) Digital balance
\nAnswer :
\n(a) Spring balance<\/p>\n

\"Samacheer<\/p>\n

II. Fill in the blanks :<\/span><\/p>\n

1. Metre is the unit of …………..
\nAnswer :
\nlength<\/p>\n

2. 1 kg of rice is weighed by ……………
\nAnswer :
\nbeam balance<\/p>\n

3. Thickness of a cricket ball is measured by ……………..
\nAnswer :
\nvernier caliper<\/p>\n

\"Samacheer<\/p>\n

4. Radius of a thin wire is measured by …………………
\nAnswer :
\nscrew gauge<\/p>\n

5. A physical balance measures small differences in mass up to ……………….
\nAnswer :
\n1mg or less<\/p>\n

III. State whether true or false. If false, correct the statement :<\/span><\/p>\n

1. The SI unit of electric current is kilogram.
\nAnswer:
\nFalse.
\nCorrect statement: The SI unit of electric current is ampere.<\/p>\n

\"Samacheer<\/p>\n

2. Kilometre is one of the SI units of measurement.
\nAnswer:
\nTrue.<\/p>\n

3. In everyday life, we use the term weight instead of mass.
\nAnswer:
\nTrue.<\/p>\n

4. A physical balance is more sensitive than a beam balance.
\nAnswer:
\nTrue.<\/p>\n

\"Samacheer<\/p>\n

5. One Celsius degree is an interval of IK and zero degree Celsius is 273.15 K.
\nAnswer:
\nTrue.<\/p>\n

6 . With the help of vernier caliper we can have an accuracy of 0.1 mm and with screw gauge we can have an accuracy of 0.01 mm.
\nAnswer:
\nTrue.<\/p>\n

IV. Match the following:<\/span><\/p>\n

Question 1.<\/p>\n\n\n\n\n\n\n\n
Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
Length<\/td>\nkelvin<\/td>\n<\/tr>\n
Mass<\/td>\nmetre<\/td>\n<\/tr>\n
Time<\/td>\nkilogram<\/td>\n<\/tr>\n
Temperature<\/td>\nsecond<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answer:<\/p>\n\n\n\n\n\n\n\n
Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
Length<\/td>\nmetre<\/td>\n<\/tr>\n
Mass<\/td>\nkilogram<\/td>\n<\/tr>\n
Time<\/td>\nsecond<\/td>\n<\/tr>\n
Temperature<\/td>\nkelvin<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 2.<\/p>\n\n\n\n\n\n\n\n
Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
Screw gauge<\/td>\nVegetables<\/td>\n<\/tr>\n
Vernier caliper<\/td>\nCoins<\/td>\n<\/tr>\n
Beam balance<\/td>\nGold ornaments<\/td>\n<\/tr>\n
Digital balance<\/td>\nCricket ball<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answer:<\/p>\n\n\n\n\n\n\n\n
Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
Screw gauge<\/td>\nCoins<\/td>\n<\/tr>\n
Vernier caliper<\/td>\nCricket ball<\/td>\n<\/tr>\n
Beam balance<\/td>\nVegetables<\/td>\n<\/tr>\n
Digital balance<\/td>\nGold ornaments<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"Samacheer<\/p>\n

V. Assertion and reason type :<\/span><\/p>\n

Mark the correct answer as :
\n(a) Both A and R are true but R is not the correct reason.
\n(b) Both A and R are true and R is the correct reason.
\n(c) A is true but R is false.
\n(d) A is false but R is true<\/p>\n

Question 1.
\nAssertion (A) : The scientifically correct expression is \u201cThe mass of the bag is 10 kg\u201d
\nReason (R) : In everyday life, we use the term weight instead of mass.
\nAnswer :
\n(a) Both A and R are true but R is not the correct reason<\/p>\n

Question 2.
\nAssertion (A) : 0\u00b0 C = 273.16 K. For our convenience we take it as 273K after rounding off the decimal.
\nReason (R) : To convert a temperature on the Celsius scale we have to add 273 to the given temperature.
\nAnswer :
\n(b) Both A and R are true and R is the correct reason<\/p>\n

\"Samacheer<\/p>\n

Question 3.
\nAssertion (A) : Distance between two celestial bodies is measured in terms of light year.
\nReason (R) : The distance travelled by the light in one year is one light year.
\nAnswer:
\n(d) A is false but R is true
\nDistance between two celestial bodies is measured in terms of unit.<\/p>\n

VI. Answer very briefly.<\/span><\/p>\n

Question 1.
\nDefine measurement.
\nAnswer :
\nMeasurement is the process of comparison of the given physical quantity with the known standard quantity of the same nature.<\/p>\n

Question 2.
\nDefine a standard unit.
\nAnswer:
\nUnit is the quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature.<\/p>\n

\"Samacheer<\/p>\n

Question 3.
\nWhat is the full form of SI system?
\nAnswer:
\nThe full form of S.I. system is the International System of Units.<\/p>\n

Question 4.
\nDefine least count of any device.
\nAnswer:
\nLeast count is the least measurement possible in a given device.
\nIt is the distance moved by the tip of the screw for a rotation of one division on the head scale.
\nLeast count = [Pitch \/ No. of head scale divisions]<\/p>\n

\"Samacheer<\/p>\n

Question 5.
\nWhat do you know about pitch of screw gauge?
\nAnswer:
\nPitch of the screw gauge is the distance between two successive screw threads. It is measured by the ratio of distance travelled on the pitch scale to the number of rotations of the head scale.<\/p>\n

Question 6.
\nCan you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?
\nAnswer:
\nNo, I can not find the diameter of a thin wire of length 2 m using the ruler.<\/p>\n

\"Samacheer<\/p>\n

VII. Answer briefly :<\/span><\/p>\n

Question 1.
\nWrite the rules that are followed in writing the symbols of units in SI system.
\nAnswer:<\/p>\n