9th Science English Medium Assignment 2021 with Answerkey (TNSCERT ):- This is the full assignment answers for 9th Science English Medium. All answers are referred to with the sura guide and Tamilnadu textbooks, This material is prepared by one of our teachers associate with our website. But if there is any mistake in this answer please inform us through the comment section, we try our best and change it immediately

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Assignment 

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Class – 9 SUBJECT : SCIENCE

PHYSICS

PART -A

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I 1 Mark Questions

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Part – B

II. Short Answer

1. Define – Astrounomical Unit

Astronomial unit is the mean distance of the sun from the centre of the earth

1 Astronomical Unit = 1.496 x 10¹¹m

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2. Define – Least Count

The smallest length which can be measured by metre scale is called least count

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3. If a man has a mass of 50kg on the earth,then what is his weight?

Mass of the man (m) = 50 kg

g =9.8 m/s2

Weight = m x g

= 50 x 9.8

Weigh tof the man is 490 N

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III Write in detail

1.Write any five rools writing SI system

• The unit names after sceientists are not written with a capital inital letter Eg Newton, henry, ampere and watt
• The symbols of the units named after sceintists should be written by the initial capital letter. Eg N for newton, H for hendry, A for ampere and W for watt
• Small letters are used as symbols for units not derived from a proper noun, Eg m for metre, kf for kilogram
• No full stop or other punctuation marks should be used within or at the end of symbols Eg 50 m and not as 50 m.
• The symbols of the units are not expressed in plural form Eg 10 kg not as 10 kgs
• Accepted symbols alon should be used, Eg ampere should not be written as amp and second should not be written as sec.

Chemistry

I 1 Mark questions

1.The name of 16th group elements in the periodic table is ……..

a) oxygen (or) chalcogen family b) Carbon family c) Nitrogen (or) chalcogen family d) Boron family

Answer:-

2. Based on which of the following Henry Moseley demonstrated characteritics of elemnts

a) X – Radiation decay b) B Radiation decay c) y – Radiation decay d) None of the above

3) The elements present in 16th group …..

4.Which block has metals, non metals and metalloid?

a) S block b) p block c)d block d)f block

5. Inser gases belongs to…..

a)17 group b)18 group c)16 group d)13 group

Part -b

Shart Answers

1.Define Dobereiner’s law of traids?

2.Define Metalloids

3. What is inert gases

Part C

III Write in details

1. Differentate metal and non metols

Biology

I. 1 Mark questions

1.Due to Diarrhoea, dehydration occurs in our body, physician finds out the illness with a pulse, which tissue shows the dehydration in our body?

a) Epithelial Tissue b) Connective Tissue c) Muscular Tissue d) Nervous Tissue

2) During the running race, Sam has got a sprain in his leg, a sprain is caused by …..

a)Excessive Stretching of ligments b) Contraction of ligaments c) Flexibility of ligaments d) strengthening of ligaments

3.They are capable of amoeboid movement, They engulf or destroy corona viruses. and play an important role in Boyds defense mechanism which tissue is responsible for the human body’s defense mechanism

a)Erythrocytes b)Leucocytes c)thrombocytes d) Lymph

4.The study of tissues is known as….

a) Entomology b)orinithology c)histologry d)oncolgy

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