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9th Science English Medium 2nd Assignment Answerkey July 2021

9th Science English Medium 2nd Assignment Answerkey July 2021 :- This is the full answerkey for the tamilnadu 9th standard science english medium 2nd assignment for july month.we also have answerkey for the tamil medium 9th science answerkey


Assignment

Class : 9 Subject: Science
(Physics)

Unit-2-Motion
Part – A

I.One Mark Questions.

1.If an object crosses equal distances in equal intervals of time, it is called as


A) Acceleration

B) Uniform motion

C) Displacement

D) Non – Uniform motion

Answer:- B) Uniform motion


2.——– is used to measure the total distance covered by the vehicle


A) Speedometer

B) Anemometer

C) Odometer

D)Tachometer

Answer:- C) Odometer


3.When an object is thrown vertically upwards, at the highest point, the body acceleration is equal to ———–


A) Centripetal force

B) Centrifugal force

C) Acceleration due to gravity

D) Centripetal acceleration

Answer:-


4.A cyclist turns around a curve at 15 km/hr. If he turns at double the speed the tendency to overturn is ——————


A) Doubled

B) Quadruped

C) Halved

D ) Unchanged

Answer:-


5.———- force is caused to deposit butter at the edge of vessels while curd churning


A) Magnetic force

B)Centripetal force

C) Centrifugal force

D) Frictional force

Answer:-


Part-B

Short answer:

Distinguish Distance and Displacement

DistanceDisplacement
The actual length of the path traveled by a moving body irrespective of the directionThe change in position of a moving body in a particular direction
Scalar quantityVector quantity

An object travels 16 m in 4 s and then another 16m in 2s. What is the
average speed of the object?

An object travels 16 m in 4 s and then another 16m in 2s. What is the
average speed of the object?

Differentiate speed and velocity

SpeedVelocity
The rate of change of distanceThe rate of change of displacement
Scalar quantityVector quantity
Speed = Distance Travelled/ time TakenVelocity = Displacement / time taken

Part – C

III.Write in detail.


Explain different types of motion.

  1. Linear motion: Motion along a straight line.
  2. Circular motion: Motion along a circular path.
  3. Oscillatory motion: Repetitive to and fro motion of an object at regular interval of time. Random motion: Motion of the object which does not fall in any of the above categories.
  4. Uniform and Non-uniform motion:
    • Uniform motion: Consider a car which covers 60 km in the first hour, 60 km in second horn-, and another 60 km in the third hour and so on. The car covers equal distance at equal interval of time. We can say that the motion of the car is uniform. An object is said to be in uniform motion if it covers equal distances in equal intervals of time howsoever big or small these time intervals may be.
    • Non-uniform motion: Now, consider a bus starting from one stop. It proceeds slowly when it passes through a crowded area of the road. Suppose, it manages to travel merely 100 m in 5 minutes due to heavy traffic and is able to travel about 2 km in 5 minutes when the road is clear. Hence, the motion of the bus is non-uniform i.e. it travels unequal distances in equal intervals of time.

Derive the Equations of motion by graphical method.

An object is in motion with initial velocity u attains a final velocity v in time t due to acceleration a, with displacement s.
Let us try to derive these equations by graphical method. Equations of motion from velocity-time graph:

Graph shows the change in velocity with time for an uniformly accelerated object. The object starts from the point D in the graph with velocity u. Its velocity keeps increasing and after time t it reaches the point B on the graph.
The initial velocity of the object = u = OD = EA
The final velocity of the object = v = OC = EB
Time = t = OE = DA
Also from the graph we know that, AB = DC

For First equation of motion
By definition, acceleration = change in velocity / time
= (final velocity – initial velocity)/time
= (OC – OD) / OE = DC / OE
a = DC/t
DC = AB = at
From the graph EB = EA + AB
v = u + at …….(1)
This is first equation of motion.

For Second equation of motion
From the graph the distance covered by the object during time t is given by the area of quadrangle DOEB
s = area of the quad-rectangle DOEB
s = area of the rectangle DOEA + area of the triangle DAB
= (AE × OE) + (1/2 × AB × DA)
s = ut + 1/2at2 ….(2)
This is second equation of motion.

For Third equation of motion
From the graph the distance covered by the object during time t is given by the area of the quadrangle DOEB. Here DOEB is a trapezium. Then
s = area of trapezium DOEB
= 1/2 × sum of length of parallel side × distance between parallel sides
= 1/2 × (OD + BE) × OE
s = 1/2 × (u + v) × t
since a = (v – u) / t or t = (v – u)/a
Therefore s = 1/2 × (v + u) × (v – u)/a
2as = v2 – u2
v2 = u2 + 2 as ………..(3)
This is third equation of motion.


Assignment

Class : 9 Subject: Science
(Chemistry)

Unit-11-Atomic Structure


Part – A

I. One mark questions:

1.The energy of K shell near the nucleus is —-


a) Higher

b) lower

c) Equal

d) Very high

Answer:-


2.What are Nucleons?


a) Proton + Neutron

b) Proton + electron

c) Proton

d) Neutron

Answer:- a) Proton + Neutron


3.Atomic number of an atom depends upon __


a) Number of Protons

b) Number of electrons

c) Number of Protons + Neutrons

d) Both a and b

Answer:-


4.——Is an example for Isotone


a) Argon and Carbon

b) Uranium and Carbon

c) Carbon and Boron

d) Sulphur and Boron

Answer:- c) Carbon and Boron


5.Which quantum Number specify the symbol ” l “


a) Spin quantum Number

b) Principal Quantum Number

c) Azimuthal Quantum Number

d) Magnetic quantum Number

Answer:-


Part – B

II. Short Answer.

What is mean by valance?


Draw the geometric Representation of Aluminium atom?


State the law of combining volumes.

Whenever gases react together, the volumes of the reacting gases and the products bear a simple whole-number ratio, provided all the volumes are measured under similar conditions of temperature and pressure.


Part – C

III.Write in detail.

Explain – Bohr’s atomic model?

Explain the quantum Numbers?


Part-D

IV. Activities
Complete the following table

Atomic numberMass numberNumber of NeutronsNumber of ProtonsNumber of ElectronsName of the Element
910
1616
2412
21
1011



Assignment

Class : 9 Subject: Science
(Biology)

Unit-11- Organization of tissues

Part – A

I. One Mark Questions:

1.Common example for complex tissues


a) Xylem, Phloem

b) Parenchyma, Collenchyma
c) Collenchyma, Sclerenchyme

d) Collenchyma, Chlorenchyma2.

Answer:- a) Xylem, Phloem

2………. tissues is also common in fruits and seeds (hardness)


a) Sclereids

b) Parenchyma

c) Collenchyma

d) Aerenchyma

Answer:- a) Sclereids

3.During corona lock down, a girl carries her father to the farthest hospital. In that time, which muscle functions more?


a) Striated Muscle voluntary Muscle
b) Striated Muscle, involuntary muscle
c) Non Striated Muscle, Voluntary muscle
d) Non Striated Muscle, involuntary muscle

Answer:-


4.In Physical education Period, suresh got wounded. Which tissue makes the wounds cure?


a) Adipose tissue

b) Areolar tissue

c) Cartilage tissue

d) Tendons

Answer:-


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


a) Epithelial Tissue

b) Connective Tissue

c) Muscular Tissue

d) Nervous Tissue

Answer:-



Part – B

II. Short Answer.

Differentiate- xylem, phloem..?


Write characteristic features of meristematic tissue?


Draw a neuron and label the parts.


Part – C

III.Write in detail.

1.Write short notes on connective tissues i) blood and ii) lymph


2.List out the differences between mitosis and meiosis.



Part-D
IV. Activity


Draw the longitudinal section of phloem tissue and label the parts.

Answer:-

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