formative assessment – i home assignment (2015

D.A.V. MODEL SCHOOL, DURGAPUR (W.B.)
FORMATIVE ASSESSMENT – I
HOME ASSIGNMENT (2015-2016)
Class-IX
Maximum Marks: 50
Subject: SCIENCE
Date : ___________
Marks :____
Signature of Examiner:_____ ___
Name:____________________ Sec:____
Roll no._____
PHYSICS AND CHEMISTRY
1.The table given below shows distance(in cm) travelled by bodies A,B,C. Read this data carefully &
answer the following questions.
Time(sec)
1st
[1.5+1+1.5+1+1+1]
Distance in (cm) covered by different bodies
A
B
C
20
20
20
2
nd
20
36
60
3rd
20
24
100
4th
20
30
140
5th
20
48
180
a)Which of the bodies is moving with i)constant speed ? ii)constant acceleration? Iii)Non-uniform
acceleration?
b)Which of the bodies covers i)Maximum distance in 3rd sec? ii)Minimum distance in 3rd sec?
c)Sketch a distance-time graph for motion of body A & body C.
d)How much distance is covered by body B in last 3 sec?
e)How much distance is covered by body C in 5 sec?
f)Which of the bodies covers least distance in first 3 sec?
2.Two stones are thrown vertically upwards simultaneously with their initial velocities u1 & u2
respectively. Prove that the heights reached by them would be in the ratio of u12:u22 (Assume upward
acceleration is –g and downward acceleration is +g.
[3]
3.The Velocity –Time Graph for motion of a body is shown below.
35
30
25
20
↑
15
Velocity(m/sec) 10
5
0
0
2
4
Time(sec)
6
8
10
→
a) Interpret the graph.
[1]
b) Find the (i) acceleration, (ii) retardation and (iii) distance travelled between 4th and 6th sec.[1+1+2]
4. Write the chemical formula of the following compounds:
[10x0.5=5]
i)Table salt ii)slaked lime iii)Bleaching powder iv) plaster of paris v) Chalk vi) Limestone vii) Carbolic
acid viii) Baking soda ix)Blue vitriol x )Philosophers wool.
5. Write the use of the following chemical apparatus & draw their diagram:
[8x0.5=4]
i)Test tube ii)Test tube stand iii)Glass rod iv)funnel v)watch glass vi)spatula vii)beaker viii)horse
shoe magnet.
5.Carbon di oxide gas is heavier than both nitrogen & oxygen. Why does not it form lower layer in the
atmosphere?
[1]
6.A person in a party has used perfume. Why do we smell the same even from a distance?
[1]
7.Which one produce severe burns on the skin between boiling water & steam & why?
[1]
8.What will happen to the naphthalene ball if it is kept in a woolen cloth for some time? Explain.[1]
9.In severe cold weather a family burnt wood in room during the night by keeping the windows close.
After sometime they felt suffocated. They immediately opened the windows & got relief. What did
actually happen.
[2]
.
BIOLOGY
10. Where will you find more number of ribosomes- in cancer cell or in fat cell?
Give reason.
11. Which organelles are responsible for the formation of the following structures?
a) Ribosome
b) Cell membrane
c) Lysosome
d) Cell wall.
12. What happens if golgi complex, nucleus and chromosomes are destroyed in a cell?
2
2
3
13. In an given experimental setup four freshly peeled potato halves are taken and scooped each one
out to make potato cups. One of these potato cup is boiled. Each of the potato cup is kept in a trough
containing water.
3
a) cup A is empty,
b) cup B contains sugar
c) cup C contains salt
d) cup D is boiled and contains sugar.
Now let us wait for two hours and observe four potato cups. Based on these fact answer the
following questions.
i)
Explain why water gathers in the hollowed portion of B and C?
ii)
Why is potato A necessary for this experiment?
iii)
Explain why water does not gather in the hollowed out portions of A and D.
14. Name the following organelles and explain why these are called so.
5.
a) suicidal bag
b) brain of the cell
c) store house of cell d) protein factory e) lungs of cell.
15. Name the following organelles and draw the labelled ultra- microscopic structure of those. Why are these
organelles called semiautonomous organelle ?
a) Power house of cell.
b) kitchen of the cell.
5.