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## Friday, January 27, 2012

### CBSE MATH STUDY: ASSIGNMENT FOR THE SESSION 2011-2012 Class: VIII Maths

CBSE MATH STUDY: ASSIGNMENT FOR THE SESSION 2011-2012 Class: VIII
ASSIGNMENT FOR THE SESSION 2011-2012 Class: VIII Subject : Mathematics Term -II
Trapezium
1. The parallel sides of a trapezium are 25 cm and 11 cm, while its non parallel sides are 15cm and
13cm. find the area of the trapezium.
2. The parallel sides of a trapezium are 78 cm and 52 cm, while its non parallel sides are 28cm and
30cm. find the area of the trapezium.
3. The parallel sides of a trapezium are 12cm and 36cm respectively. Its non parallel sides are each equal to 15cm. Find the area of the trapezium.
AREA
1. Verify Euler’s formula for a) Square pyramid b) Pentagonal prism c) tetrahedron
2. The area of a rhombus is equal to the area of a triangle whose base and the corresponding altitude
are 24.8 cm and 16.5 cm respectively. If one of the diagonal of the rhombus is 22 cm, find the length of the other diagonal.
3. The floor of a rectangular hall has a perimeter 250m. If the cost of paining the four walls at the
rate of Rs 10 per m2 is Rs 1500. Find the height of the hall. Ans: 3/5 m = 0.6m
4. A room is half as long again as it is broad. The cost of carpeting the room at Rs 3.25 per m2 is Rs 175.50 and the cost of papering the walls at Rs 1.40 per m2 is Rs 240.80. If 1 door and 2 windows occupy 8m2, find the dimensions of the room.
5. A river 2m deep and 45m wide is flowing at the rate of 3 km per hour. Find the volume of water that runs into the sea per minute.
6. A closed cylinder has diameter 8cm and height 10cm. Find its total surface area and volume.
7. The volume of a metallic cylinder pipe is 748cm3 . Its length is 14 cm and external diameter 18cm. Find its thickness.
8. A cylindrical bucket, 28cm in diameter 72cm high is full of water. The water is emptied into a rectangular tank, 66cm long and 28cm wide. Find the height of the water level in the tank.
9. A cylindrical tube, open at both ends, is made of metal. The internal diameter of the tube is 10.4cm and its length is 25cm. The thickness of the metal is 8mm everywhere. Calculate the volume of the metal.
10. The difference between outside and inside surface of a cylindrical metallic pipe 14cm long is 44cm2 . If the pipe is made of 99 cm3 . Find the outside and inner radii of the pipe.
Volume and surface area.
1. A hollow cylindrical pipe is 21 dm long. Its outer and inner diameters are 10cm and 6cm respectively. Find the volume of copper used in making the pipe.
2. The height of a right circular cylinder is 10.5m. Three times the sum of the areas of its two circular faces is twice the area of the curved surface. Find the volume of the cylinder.
3. The circumference of the base of a 10m high conical tent is 44m. Calculate the length of canvas used in making the tent if width of canvas is 2m.
4. The radius and height of a cone are in the ratio 4:3 the area of the base is 154cm2. find the area of
the curved surface.
5. The volume of a metallic cylindrical pipe is 748cm3 . Its length is 14 cm and its external radius is 9 cm. Find its thickness.
6. A well of inner diameter 14m is dug to a depth of 15m. Earth taken out of it has been evenly spread all around it to a width of 7m to form an embankment. Find the height of the embankment.
7. A cloth having an area of 165m is shaped into a cylindrical tent of radius 5m. How many students can sit in the tent if a student occupies 5/7 m2 ? Find the volume of air for each student.
8. The difference between inside and outside surfaces of cylindrical tube 14cm long is 88 sq.cm. If the volume of the tube is 176 cubic cm. find the inner and outer radii of the tube.
9. The area of three adjacent faces of a cuboidal box are 120cm2, 72cm2 and 60cm2 respectively. Find the volume of the box.
10. The total surface area of a hollow cylinder which is open from both sides is 4620cm2, area of base ring is 15.5cm2 and height 7cm. Find the thickness of the cylinder.
RATIO AND PROPOTION
1. The extension in an elastic string varies directly as the weight hung on it. If a weight of 150g produces an extension of 2.8cm, what weight would produce an extension of 19.6cm?
2. A group of 120 men had provisions for 200 days. After 5 days, 30 men died due to an epidemic. How long will the remaining food lost?
3. 1200 soldiers in a fort had enough food for 28 days. After 4 days. Some soldiers were transferred to another fort and thus the food lasts for an extra 32 days. How many soldiers left the fort?
4. If 12 men or 15 woman can finish a piece of work in 66 days. How long will 2 men and 3 woman take to finish the work?
5. If 5 men or 7 women earn Rs 525 per day, how much would 7 men and 13 women earn per day?
6. In an army camp of 1400 men, these is enough food to last for 18 days if each man consumes 396g per day. How many men should leave the camp so that the same food may last for 21 days with each man having 432g per day?
Bar Graph
1. The following table shows that the favorite sports of 250 students of a school. Represent the data by a bar graph.
Sports                   Cricket     Foot ball      Tennis      Badminton      Swimming
No of students          75             35              50                25                65
2. Given below is a table which shows the year wise strength of a school. Represent this data by a bar graph.
Year                   2001 -02  2002 -03   2003 -04    2004 -05       2006 -07
No of students       800       975             1100           1400          1625
3. The air distances of four cities from Delhi ( in km) are given below. Represent the data by a bar graph.
Distance from Delhi in Km  1340       1100              1700           1220
4. The following is the distribution of weights in kg of 52 persons:
Weight in kg      30 – 40   40 – 50       50 – 60         60 – 70      70 – 80
Persons                10       15                   17               6                4
5. What is the lower limit of class 50 – 60?
6. Find the class mark of the classes 40 – 50, 50 – 60
7. What is the class size?
Pie Chart
1. The number of students in a school speaking different languages is given below. Present the data
in a pie chart
Language                Hindi     English    Marathi     Bengali       Tamil
No of students              40        12            9               7             4
2. The number of hours spend by a school boy on various activities on a working day are given below.
Activity             School       Homework     Play    Sleep        Others
No of hours         8                  4              3           7                3

3. Draw a pie chart for the following data of the investment pattern in a five year plan:
Agriculture      Irrigation       Small industries Transport       Power       Social service
14%                  16%                29%                  17%         16%             8%
Probability
1. A coin is tossed 500 times and we get head;285times, tail;215 times, when a coin is tossed at random, what is the probability of getting i) a head ii) a tail?
2. Two coins are tossed 400 times and we get two heads ; 112 times, one head : 160 times, zero head : 128 times when two coins are tossed at random, what is the probability of getting
3. Three coins are tossed 200 times and we get three heads: 39 times , two heads 58 times , one head; 67 times, 0 head ;36 times. When three coins are tossed at random what is the probability of getting
4. Two coins are tossed simultaneously 500 times, we get two heads 105 times, one head 275 times and no head 120 times. Find the probability of getting i) 2 tails ii) one tails iii) 2 heads.
5. All kings, jacks and diamonds have been removed from a pack of cards and the remaining cards are well shuffled. A card is drawn at random. Find the probability that it is (i) a red queen (ii) a face card (iii) a diamond (iv) a black card.
6. The shoppers who come to a departmental store are marked as :
man(M), woman(W), boy (B)or girl ( G).
The following list gives the shoppers who came during the first hour in the morning:
W W M W G W M W B W G M W M B G B W G W M G W M W G M W B W M W G W MW G M W B G W M W W M W G W M W G W M W G W M W W .
Make a frequency distribution table using tally marks.
7. A box contains 17 cards numbered 1,2,3,4,……17. A card is drawn at random from the box. Find the probability that the number on the card is
i) odd
ii) even
iii) prime
iv) divisible by 3
v) divisible by 2 and 3 both
vi) divisible by 4 or 7
vii) divisible by 2 or 3.
8. Numbers 2 to 10 are written on ten separate slips( one number on one slip), kept in a box and mixed well. One slip is chosen from the box without looking onto it. What is the probability of.
i) getting a number 6?
ii) getting a prime number
iii) getting a number greater than 5?
Graph
1. Plot the following points on the graph paper and name the quadrant in which it lies
(4, -2 ) (-1 ,3) ( 0, -1 ) ( 5, -2) ( 2, 1 ) ( -5, -3 ) and (-2, 0)
2. Draw the graph of the following equations.
i) 3x +2y =5 ii) y – 3x =2
3. Solve the following system of linear equations graphically.
a) 4x – 5y – 20 and 3x + 5y – 15 = 0
b) x + 2y = 3 and 4x = 3Y = 2.
1. Construct a quadrilateral ABCD given that
AB = 3.7cm, BC = 3.8 cm, CD = 4.3 cm, DA = 4.6 cm and ∠ D =75
2. Construct a quadrilateral ABCD given that
BC=4.5 cm, AB=4cm, ∠ B=75 ∠ A=90 and ∠ C=120
3. Construct a quadrilateral ABCD in which
AB=BC=5.5cm, CD=4cm, DA=6.3cm and AC=9.4cm. Measure  BD.
where A=65, B=105, C=75, BC=5.7 cm and CD=6.8 cm.
5. Construct a quadrilateral PQRS in which
PQ=6 cm, QR=5.6 cm, RS=2.7 cm, ∠ Q=45 and ∠ R= 90
6. Construct a parallelogram with diagonals 5.4 cm and 6.2 cm and the angle included by the two diagonals is 45
7. Construct a parallelogram ABCD using only ruler and compass, such that AB=6cm, BC=3cm and angle B=45. Write the steps of construction in brief.

8. Construct a rhombus ABCD using only ruler and compass, such that the side of the rhombus is 4 cm and one of its angles is 30. Write the steps of construction in brief.
9. Construct a trapezium ABCD in which AB=6 cm, BC= 4 cm, CD=3.2 cm ∠ B=75 and DC||AB.
10. Draw a trapezium ABCD in which AB//DC, AB = 7 cm, BC = 5cm, AD = 6.5 cm and ∠ B = 60
PARALLELOGRAM
1. Two adjacent angles of a parallelogram are as 2:3. Find the angles
2. Prove that the opposite sides of a parallelogram are equal.
3. Prove that in a parallelogram diagonals bisect each other.
4. In the adjacent figure, ABCD is a parallelogram and line segments AE and CF bisect the angles A and C respectively. Show that AE // CF.
5. Two lines AC and BD, 5cm each bisect each other. If A,B,C,D are joined what type of quadrilateral is formed. Justify your answer.
6. ABCD is a parallelogram in which AB= 2AD and p is the midpoint of AB, then Find ∠CPD.
7. In a parallelogram ABCD, if AB= 2x+5, CD= y+1 AD=y+5 and BC=3x-4, then find the ratio of AB:BC.
8. ABCD is a parallelogram whose diagonals intersect each other at O. A line segment EOF is drawn to meet AB at E and DC at F. Prove that OE = OF.
9. ABCD is a parallelogram in which AB is produced to E so that BE=AB. Prove that ED bisects BC.
10. PQRS is a rectangle. PR is a diagonal. QM & SN are perpendiculars drawn from Q & S on PR. Prove that QM = SN.
1. ABCD is a quadrilateral in which AB=AD and BC=DC. Prove that AC bisects ∠A and ∠C.
2. If angles P, Q, R and S of the quadrilateral PQRS taken in order and in the ratio 3:7:6:4 then show that PQRS is a trapezium.
3. In a quadrilateral ABCD, the line segments bisecting∠ C and ∠D meet at E. Prove that ∠A+∠B =2∠CED
4. If bisectors of ∠A and ∠B of a quadrilateral ABCD intersect each other at P , of ∠B and ∠ C at Q, of ∠C and ∠D at R and ∠ D and ∠A at S, then show that PQRS is a quadrilateral whose opposite angles are supplementary.
5. In a quadrilateral ABCD, the bisectors of < A and < B meet in a point P. If ∠ C = 100 and ∠ D = 60, find the measure of ∠ APB

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