09.01.17
--------------
SURFACE AREAS AND
VOLUMES
SUB TOPIC – SURFACE AREAS
1.A cubical
box has each edge 10cm & another cuboidal box is 12.5cm long,10cm
wide& 8cm high
(i) Which box has the greater lateral
surface area? by how much?
(ii) Which box has the smaller total
surface area & by how much?
2.Parveen wanted to make a temporary
shelter for her cars, by making a box like structure with tarpaulin that covers
all the four sides and the top of the car. Assuming that the stitching margins
are very small, how much tarpaulin would be
required to make the shelter of height 2.5m, with base dimensions 4m X 3m ?
3. A cylindrical pillar is 50cm in diameter
& 3.5m in height. Find the cost of painting the curved surface area of the
cylinder rat the rate of Rs 12.50 per m2
4.The inner diameter of a circular well is
3.5m . It is 10m deep. Find (i) the inner CSA
(ii) the cost of plastering this CSA at the
rate of Rs 40 perm2
5.The slant height & base diameter of a
conical tomb are 25m & 14m respectively. Find the cost of white washing its
curved surface at the rate of Rs 210 per100m2
6. Find the surface area of a sphere of
radius 5.6 cm
7. The radius of a spherical balloon increases
from7 cm to 14 cm as air is being pumped into it. Find the ratio of surface
areas of the balloon in the two cases
16.01.17
---- SUB TOPIC – VOLUMES
1.Find the cost of digging a cuboidal pit
8m long 6m broad and 3m deep at the rate
of Rs 30 per m3
2. A soft drink is available in two packs –
(i) a tin can with a rectangular base of length 5 cm & width 4 cm , having
a height of 15 cm & (ii) a plastic cylinder with circular base of diameter
7 cm & height 10 cm . Which container has greater capacity & by how
much?
3. A patient in a hospital is given soup in
a cylindrical bowl daily of diameter 7 cm If the bowl is filled with soup to a
height of 4 cm , how much soup the hospital has to prepare daily to serve 250
patients?
4.Find the volume of a right circular cone
with radius 3.5 cm , height 12 cm ?
5.Find the volume of a sphere of radius
0.63 m
6. Find the amount of water displaced by a
solid spherical ball of diameter 0.21 m
23.01.17 ---- STATISTICS
1. For a particular year , following is the
distribution on ages (in years) of primary school teachers in a district
|
AGE IN YEARS
|
NO: OF TEACHERS
|
|
15-20
|
10
|
|
20-25
|
30
|
|
25-30
|
50
|
|
30-35
|
50
|
|
35-40
|
30
|
|
40-45
|
6
|
|
45-50
|
4
|
(i)
Write the lower limit of the
first class interval
(ii)
Determine the class limits of
the fourth class interval
(iii)
Find the class mark of the
class 45 – 50
(iv)
Determine the class size
2. Text book exercise 14.2 questions 3 , 4
, 5 & 8
3. Given below are the seats won by
different political parties in the polling outcome of a state assembly
elections
|
Political party
|
A
|
B
|
C
|
D
|
E
|
F
|
|
Seats won
|
75
|
55
|
37
|
29
|
10
|
37
|
Draw a graph to represent the polling
results
4. The following table gives the life time
of 400 neon lamps
|
Life time
|
300-400
|
400-500
|
500-600
|
600-700
|
700-800
|
800-900
|
900-1000
|
|
Number of lamps
|
14
|
56
|
60
|
86
|
74
|
62
|
48
|
Represent the given information with the
help of a histogram
No comments:
Post a Comment
Note: only a member of this blog may post a comment.