10th science assignment answer 2021 :- This is the answers for first assignment given by the tamilnadu educational department for sslc students. This is for english medium students only, we also have answer for tamil medium students too, please search our website.
10th Science TN SCERT
Unit 1 Answers
Assignment
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
Answer: 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
Answer: b) Conservation of momentum
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
Answer: c) Both A and B
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
Answer: 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
Answer: 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’.
Classifications:
- 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.
Resultant Force Fnet = F2 – F1
F2 = 15N
F1=5N
Fnet =15 -5 =10 N
The action of the resultant force is in the direction of F2
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.
F=m x a
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 Assignment
Class:10 Subject: Science
Chemistry
UNIT-7 Atoms and Molecules
Part –A
I. Choose the correct answer
1. The 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
Answer: 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
Answer: b) Elements show same mass number with different atomic number
3. The Atomicity of Glucose molecule is ……….
a) 6
b) 12
c)24
d) 18
Answer: c)24
4. The mass of 5 moles of sodium is …….
a) 46g
b) 34g
c) 105g
d) 115g
Answer: 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
Answer: b) 18.069 x 1023
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 1/12th part of the mass of a carbon-12 atom.
- It is denoted as Ar.
- It is otherwise called “Standard atomic weight”
- Relative atomic mass (Ar) =[ Average mass of atoms of an element / Mass of one atom of carbon -12 ] x 12
13.Give any two examples for heteroatomic molecules
Heteroatomic molecules are classified as
- Diatomic molecule – HCL, CaO
- Triatomic Molecule – H2O, CO2
- Polyatomic Molecule – H2SO4,CH3COOH
14.Calculate the number of moles in 46g of Sodium?
Number of Moles = Mass of the element / Atomic mass of the element
= 46/23
=2 moles of sodum
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].
Assignment
Class:10Subject: Science | Biology
UNIT 12 – Plant Anatomy and Plant PhysiologyBiology
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.Rao2.
Answer: b) Nehemiah Grew
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
Answer: c) Tissues
3. The pores present in Epidermis are called
a) Stomata
b) Cuticle
c) Trichome
d) Stele
Answer: a) Stomata
4. Xylem and Phloem are present in different radii of ———-
a) root
b) stem
c) leaf
d) flower
Answer: a) root
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
Answer: b) conjoint bundle
Part – B
II. Short Answer
11.What are tissues?
Tissues are the group of cells that are similar or dissimilar in strcuture and origin,but perform similar function.
12.Classify the types of plant tissues.
- Dermal or Epidermal tissue system
- Ground tissue system
- Vascular tissue system
13.What are the functions of Dermal or Epidremal tissue system?
Answer:The outermost 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
| Tissues | Discot Root | Monocot Root |
| Number of Xylem | Tetrarch | Polyarch |
| Cambium | Present (During Secondary Growth Only) | Absent |
| Secondary Growth | Present | Absent |
| Pith | Absent | Present |
| Conjunctive Tissue Ex | Parenchyama Bean | Scelerenchyma Maize |
17.a) Write the components and functions of plant tissue system.
| Tissue System | Components | Functions |
| Dermal Tissue System | Epidermis and Periderm (in older stems and roots) | Protection Prevention of water loss |
| Ground Tissue System | Parenchyma Tissue Collenchyma Tissue Sclernchyma tissue | Photosynthesis Food Storage Regeneration Support Protection |
| Vascular Tissue System | Vascular Tissues -Xylum Tissue -Phloem Tissue | Transport of water and minerals Transport of food |
b) Classify the tissues based on their ability to divide
