ASSIGNMENT 6-CLASS-|X

Name

Roll No. Section Dated

. Lesson - 1 Matter in our surroundin$s

1 . Arrange the following substances in the increasirrg order of force of attraction between their

particles: "

. Oxygen, Salt, Milk

2. What is meant by particulate nature of matter?

3. Whatis the effect of the following on the rate of diffusion?

(a) Temperature (b) Densityof Liquid

4" Suggest an activity to show that the rate of diffusion of liquids decreases with increase in the

densityof the liquid.

5. What determines the state of a substance?

6. Does evaporation cause a physical change or a chemical change?

7 . How does spreading of wet clothes quicken the process of drying? Explain.

8. When a solid melts, its temperature remains constant, so where does the heat energy go?

What is the name given to this heat?

9. Mention the physical quantities and the manner in which these need to be altered for

liquefying gases.

10. Melting points of substances A,B,C are 520 C, 1750 C and 800 C. Arrange thern in the

decreasing order of interparticle force of attraction in each of them. Give reason for your

answer.

11 . Latent heat of evaporation of two liquids A&B is 1 00J/kg and 1 50J/kg respectively. Which one

can produce more cooling effectand Why?

12. Draw a cyclic figure to show interconversion of states and label fusion, vapcrization,

condensation, solidifi cation and sublimation.

13. Archit dropped a crystal of potassium permanganate into two breakers A and B cantaining

hot water and cold water respectively. After keeping the beakers undisturbed for sometime

what did he observe and why?

14. Rama was making tea in a kettle. Suddenly she felt intense heat from the puff of steam

gushing out of the spout of the kettle. She wondered whether the temperature of the stearn

1 (A2-lx-Science (Chemistry)

was higher than that of boiling water in the kettle. Write your comments about it

15. . (a) Name the Sl unit of measuring temperature.

(b) The boiling point of water is 100C under normal atmospheric pressure. Convert this

temperature in Slunit.

10. Define sublimation. Draw labeled diagram to illustrate the process of sublimation

17 . Why is evaporation called a surface phenomenon?

18. What is evaporation? ln the following exarnples state which factor is responsible for the

change in rate of evaporation and how?

(a) Clothes dry faster on a windy day.

(b) Wet clothes dry faster on preading them

(c) Clothes dryfaster in sun than in shade

(d) Clothes take longertime to dry on a rainy day'

19. Value Based Question

Ram is fond of noodles made up of refined flour (maida) which is harmful for our health.

Shyam takes vegetable atta noodles which are better. lt has 10.2o/o protein, 63'8%

carbohydrates, 2.9% sugar and 5.3% dietary fibre and 13.4% fat, Mohan takes multigrain

noodles which are even better, but if can avoid such processed food and take fresh

vegetables, fruits and chappati or brown rice, itwill make us more healthy.

(a) What values are not possessed by Ram who takes lot of noodles made up of maida?

(b) Why should we take fresh vegetables and fruits?

(c) Whyshould we nottake processed food containing refined flourand fats?

ZO. The temperature-time graph given below shows the heating curve for pure wax. From the

graph answer the following :

rfr tto'cI

(J

(,

TE

oI 15oc,0,

(a)

(b)

(c)

(d)

(e)

Time -*What is the physical state of the substance atthe pointsA,B,C and D?

Whatisthe melting pointof the substance?

What is its boiling point?

Which portions of the graph indicatethatchange of state istaking place?

Name the terms used for heat absorbed during change of states involved in above

processes.

2 (A2-lx-science (Chemistry)

-=

Name

Roll No. Section

Lesson - 5 The Fundamental Unit of Life1. Define cell:,i"j..,".'-"",: .

2. \Alhat is the name given to components of the cell ?

3. Name the basic components of cell.

4. \Mich two organelles of a cell contain their own genetic materia! ?

5. Give the difference between chromatin fibers and chromosomes.6. What is Endocytosis ? given one example.7. Difference between osmosis and diffusion.8. ldentity and name the following cell structure.

1. The undefined nuclear region of prokaryotic cell.

2. Site of energy release inside the cell.

9. Which micro-organisms locks any kind of membrane ?

10. \A/hat is DNA ? Name the functiona! segment of DNA.

11. State any two reasons for plant cells to have large central vacuole.12. What will happen to a plant cell if it kept in a

(i) Hypotcnic solution (ii) Hypertonic solution.13. \Nhy is the Plasma Membrane called a selectively permeable Membrane ?

14. What will happen if :

Golgi, apparatus is removed from the cell.

#

15. Explain the structural difference between plastids and mitochondria. Write one similaritybetween thehrvo.

16. Give the difference between cell wall and ptasma membrane.17. Drawa neatdiagram of an animalcelland labelthefollowing parts.

(i) Suicide bags of cell (ii) Powerhouseof the cell.(iii) The organelle that forms cytoplasmic frameworks.

18. Whatarecisterns?19. Name the organelle which act as waste disposal system of cell. How do they perform their

function.

20. Drawthe diagram of prokaryoitc cell.

Value based question1. Two beakersAand B contain plain waterand concentrated sugarsolution respectively. Equal

number of dried raisins are kept in them forfew hours and then taken out.

(i) Explain the reason for the difference in the physical appearance of raisins which were

taken outof two beakers.(ii) On the basis of observations categorise the two solution as Hypertonic and

Hypotonic.

1 (A6-lx-Biology)

BIOLOGY ASSTGNMENTa.CLASS-|X ) SESSTON 201G-201€

sctENcE (pHystcs) ( ASSIcNMENTS,-CLASS-rX ) sESSTON zlrti-zr,tg

Name

Roll No. Section ffiated

' Lesson-8MOTION

Q1 . Abody is moving along a circle of radius r. What are the values of di*tance and dispiacement

in half the revolution.

Q2. A car moves through 20km at a speed of 40km/h & next 20km at a speed of 60 krn/h.

Calculate its average speed.

Q3. A body moving with a velocity of 36km/h is brought to resr in 5 seconeis. Calculate the

retardation.

Q4. A ship nroving with a constant acceleration of 2Skrn/h' in a fixed direction speeds up frcnn

1Okm/h to 15 km/h. Find the distance travelled by ihe ship in this peri*d.

Q5. A body starts from rest and moves with uniform acceleraticn mf S mis'. What will be the

distance travelled atthe end of 20 seconds?

Q6. An electric train is moving with a velocity of 12Q km/h. How mr:ch distance witl it move in 30

seconds?

Q7. Acar acquires a velocity of 72kmlh in 10 seconds starting from rest. Flnd

1. Theacceleration

2. The average velocity

3. The distance travelled in this time.

Q8. The brakes applied to a car produces an acceleration of Srrr's* iri ih* ci:pi:site dlreetlon to the

rnotion. !f the car takes 2 seconds to stop after the appli*aticr: *f hnakes, *alculate the

distanee it travels during this time.

Qg. A cyclist goes once round a circular track of diameter ''!05 met:"e !* ,E minutes. ealculate his

speed.

Q10.A pailicle rnCI\res 3 rnetre north, then 4 metre east and flnally 6 rn sr:uth. *alculate the

distance travelled and displacement.

Q11. Ascooter acquires a velocity of 36 km/h in 10 se*onds ju*t afterthe sta;"t. It tskes 20 seeonds

to stop" Calcillate the acceleration in two cases.

Q12. Rohan and his sister Saniya go to school together in their *an. Roi'lan drives rnuch faster than

Saniya. Saniya tells Rohan nottotake the risk of overspeeding. She tells hin: ihattirne taken

to reach school would depend upon average speed. By over sp*eding for a tittle while, the

risk involved is much greater compared ts tne !if,i[e tlnne saved. Answer the following

1 (A5-lx-Science (Physics)

questions based on the above paragraph.

1 . Which values are displayed by Saniya?

2. ls Saniya rightin herstatement?

3. Howdoyou define average speed?

Q13. Draw distance-Time graph for

1. When the object is in uniform motion

2. When the object is in non-uniform motion.

Q14.A particle moves over the three quarters of a circle of radius. What is the magnitude of its

displacement?

Q1S.The velocity-time graph of an ascending passenger lift is given in figure. What is the

acceleration of the lift:

1. During thefirsttwo second

2. Between 2nd & 10th second

3. Duringthelasttwoseconds.

t)

4.

x246Blo12<- Time (s) +

Q16. Two cars A & B have their displacement time graph as given below. which car has a higher

velocity & explain why?

AI

ag'6o6

T

2 (A5-lx-Science (Physics)

Q1 7. Four speed time graphs are shown betow

Which graph represents the following case ?

a) Aballthrown vertically upward and retuming to the hand of thrower?

b) Abodydecelerating to a constantspeed and then accelerating.

Q18. The graph given below is the distance-time graph of on object.

(i) Find the speed of the object during first four seconds of its journey.

(ii) How long was itstationary ?

(iii) Doesitrepresenta realsituation?Justifyyouranswer.

oEEooCLa

oEEooo.o

oEEooo.o

time (s) time (s)

Time (s)

3 (A5-lx-Science (Physics)

Cr75

ooCsoo

.9,Ezs

e19. Afrog hops from pointAto point B atong a straight line path in 10 seconds & then turns & hops

to point C in another 5 Seconds. Calculate the average speed & average velocity of the frog

the motion between

(a) Ato B (b) AtoCthrough B

BCA( lr rr lOr tt t(Etr r@ )' -t -6 -s -4 -3 -2 -1 o 1 2 3 4 5 6 7

e20. Which of the two bodies A & B in the following graph is moving with higher acceleration &

whv?

Velocity (m/s)

e21.A bus covers a distance of 250 Km from palampur to kullu towards west in 5 hours in the

moming & retums to palampur in the evening covering the same distance of 250 Km in the

sametime of 5 hours. find

(a) average speed (b) average velocity of the bus for the whole jou rney.

e22. Aradar spots a plane. lf radio pulse emitted by radar and reflected by the plane reacher back

to ground station in 0.5 x 10's. What is the distance of the plane from the radar station (speed

of radio pulse is 3 x 10'm/s)

Q23. Answer the following questions:-

(i) Give the name of physical quantity that corresponds to the rate of change of

displacement.

(ii) Aman moves on a circular path of radins'r'and comes to his original position. Find the

distance travelled & the displacement of the man.

(iii) A body is moving with a velocity of 10 m/s lf the motion is uniform, what will be the

velocity after 1 0 seconds.

Q24. Derive the acceleration of motion.

v = u + at bY graPhical method.

Or

V=u+at

4 (A5-lx-Science (PhYsics)