10th Science Assignment Answer Key PDF , Question, Answer Key 2021

10th Science Assignment Answer Key PDF , Question, Answer Key 2021

Tamilnadu state board samacheer kalvi 10th std all subjects assignment writing work sheet and answer guide PDF Download

TNSCERT 10th Physics Assignment PDF Download with answer 

10th Science Assignment  Question paper ,answer key

10th Science TN SCERT Unit 1 Answers


  • Class:10
  • Subject: Science | Physics
  • UNIT-1 Laws of motion

Part – A

I. Choose the correct answer

1. Inertia of a body depends on--------------

a) Weight of the object 

b) acceleration due to gravity 

c) mass of the object

d) Both a and b

Ans:  c) mass of the object

2. In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move upward. Which principle is followed in this take off of the rocket?

a) Moment of inertia 

b) Conservation of momentum 

c) Newton’s first law of motion 

d) Newton’s law of gravitation

3. There are two statements

A) Newton’s first law is valid from the pilot in an aircraft which is taking off

B) Newton’s first law is valid from the observer in a train moving with constant velocity Which of the following is correct?

 a) A only 

b) B only 

c) Both A and B

d) Both A and B wrong

 4. Which of the following law is used to discover new stars and planets?

 a) Newton's first law

b) Newton's second law 

c) Newton's third law 

d) Newton's law of gravitation

5. The Resultant force of two equal parallel forces acting in opposite direction in the same line of action is

a) Fnet = F1 + F2 

b) Fnet = F2-F1 

c) Fnet = F2+F1 

d) Fnet=0

Part – B

 II. Short Answer

11. Define Inertia. Give its classification
  • The inherent property of a body to resist any change in its state of rest or the state of uniform motion, unless it is influenced upon by an external unbalanced force, is known as ‘inertia’.
  • Inertia of rest
  • Inertia of motion
  • Inertia of direction
 12 If a 5N and a 15N forces are acting opposite to one another. Find the resultant force and the direction of action of the resultant force.

13. State Newton’s second law.

  • The force acting on a body is directly proportional to the rate of change of linear momentum of the body and the change in momentum takes place in the direction of the force.

Part – C

III. Write in Detail

18. What are the types of Inertia? Give an example for each type

Types of Inertia:
  • Inertia of rest: The resistance of a body to change its state of rest is called inertia of rest.
E.g.: When you vigorously shake the branches of a tree, some of the leaves and fruits are detached and they fall down (Inertia of rest).

The inertia of motion: 
  • The resistance of a body to change its state of motion is called inertia of motion.
E.g.: An athlete runs some distance before jumping. Because this will help him jump longer and higher. (Inertia of motion)
  • Inertia of direction: The resistance of a body to change its direction of motion is called inertia of direction.
E.g.: When you make a sharp turn while dr

10th Science TN SCERT Unit 1 Answers


  • Class:10
  • Subject: Science | Chemistry
  • UNIT-7 Atoms and Molecules

10th Chemistry -UNIT-7 Atoms and Molecules (Assignment Questions)

Part –A

 I. Choose the correct answer

1. Number of electrons, protons and neutrons present in 17Cl35, 17Cl37 is------- --------

 a) 17e¯ , 17p+, 17n

17e¯ , 20p+, 19n

 b) 18e¯ , 18p+, 17n

17e¯ , 17p+, 19n

c) 17e¯ , 17p+, 18n  

20e¯ , 20p+, 17n

d) 18e¯ , 17p+, 18n

17e¯ , 17p+, 20n  

2. Isobars are defined as---------

a) Elements show same atomic number with different mass number

b) Elements show same mass number with different atomic number

c) Elements show same valency

d) None of these

3. The Atomicity of Glucose molecule is ________.

a) 6

b) 12


d) 18

 4. The mass of 5 moles of sodium is -------------

a) 46g b)


c) 105g

d) 115g

5. Number of atoms present in 3 moles of iron is--------

a) 6.023 x 1023

b) 18.069 x 1023

c) 12.046 x 1023

d) None

Part - B

II. Short Answer.

12. Define : Relative atomic mass
  • Relative atomic mass of an element is the ratio between the average mass of its isotopes to \( '\frac{1}{12^{th}}\' )part of the mass of a carbon-12 atom. It is denoted as Ar.
13.Give any two examples for heteroatomic molecules
  • HI, HCl, CO, HBr, HF.
14.Calculate the number of moles in 46 g of Sodium?

Part – C

 III.Write In detail.

17.Give the salient features of “Modern Atomic Theory”

  • The salient features of “Modem atomic theory” are,
  • An atom is no longer indivisible.
  • Atoms of the same element may have different atomic mass.
  • Atoms of different elements may have the same atomic masses.
  • Atoms of one element can be transmuted into atoms of other elements. In other words, an atom is no longer indestructible.
  • Atoms may not always combine in a simple whole-number ratio.
  • Atom is the smallest particle that takes part in a chemical reaction.
  • The mass of an atom can be converted into energy [E = mc2].iving a car, you tend to lean sidewa.

10th Science TN SCERT Unit 12 Answers


  • Class:10
  • Subject: Science | Chemistry
  • UNIT 12 - Plant Anatomy and Plant Physiology

Biology UNIT-12 Plant Anatomy and Plant Physiology

Part – A

 I. Choose the correct answer

1. Who is the father of plant anatomy?

a) Sachs 

b) Nehemiah Grew 

c) Melvin Calvin 

d) C.N.R.Rao

2. The group of cells which are similar or dissimilar in structure and origin that perform similar function is called 

a) Organ System 

b) Vascular Bundles 

c) Tissues 

d) Pericycle

3. The pores present in Epidermis are called

a) Stomata 

b) Cuticle 

c) Trichome 

d) Stele

4. Xylem and Phloem are present in different radii of ----------

 a) root 

b) stem 

c) leaf 

d) flower

5. If xylem and phloem lie on the same radii that vascular bundle is -------------- 

a) radial bundle 

b) conjoint bundle 

c) concentric and amphivasal 

d) amphicribral

Part - B

 II. Short Answer

 11.What are tissues?

12.Classify the types of plant tissues.


  • Epidermis protects the inner tissues.
  • Stomata helps in transpiration.
  • Root hairs help in absorption of water and minerals.

13.What are the functions of Dermal or Epidremal tissue system?


  • The outer most covering layer of plants.
  • It contains epidermis, stomata and epidermal out growths.
  • Epidermis are interrupted by many minute pores called stomata.
  • Epidermis is covered by cuticle to check evaporation of water.
  • Trichomes and root hairs are some epidermal growths.

III. Write In detail

16.a)Differentiate the following

Monocot root and Dicot root

b) Draw a neat labelled diagram of Radial vascular bundle

17.a) Write the components and functions of plant tissue system.

b) Classify the tissues based on their ability to divide


(Inertia of direction).


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