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1.

Question 1 (ii)Can a polyhedron have for its faces:(ii) 4 triangles?

Answer» Question 1 (ii)

Can a polyhedron have for its faces:

(ii) 4 triangles?
2.

(i) Something happened at Lyonnesse. It was (a) improbable. (b) impossible. (c) unforeseeable. (ii) Pick out two lines from stanza 2 to justify your answer.

Answer»

(i)
Something happened at Lyonnesse. It was


(a)
improbable.


(b)
impossible.


(c)
unforeseeable.


(ii) Pick
out two lines from stanza 2 to justify your answer.

3.

Take away: (i) 65x2−45x3+56+32x from x33−52x2+35x+14 (ii) 5a22+3a32+a3−65 from 13a3−34a2−52 (iii) 74x3+35x2+12x+92 from 72−x3−x25 (iv) y33+73y2+12y+12 from 13−53y2 (v) 23ac−57ab+23bc from 32ab−74ac−56bc

Answer»

Take away:

(i) 65x245x3+56+32x from x3352x2+35x+14

(ii) 5a22+3a32+a365 from 13a334a252

(iii) 74x3+35x2+12x+92 from 72x3x25

(iv) y33+73y2+12y+12 from 1353y2

(v) 23ac57ab+23bc from 32ab74ac56bc

4.

Question 5 Factorise: (i) 4x2+9y2+16z2+12xy−24yz−16xz(ii) 2x2+y2+8z2−2√2xy+4√2yz−8xz

Answer» Question 5
Factorise:
(i) 4x2+9y2+16z2+12xy24yz16xz(ii) 2x2+y2+8z222xy+42yz8xz
5.

What is the area of the red part as a fraction of the whole hexagon?

Answer»

What is the area of the red part as a fraction of the whole hexagon?


6.

A figure has lines of symmetry as 4 and rotational symmetry of 2. Find its area given that its side length is 5m and base length is 6m and height is 4m .Find the area of the figure?

Answer»

A figure has lines of symmetry as 4 and rotational symmetry of 2. Find its area given that

its side length is 5m and base length is 6m and height is 4m .Find the area of the figure?

7.

Question 4(iii)Numbers 1 to 10 is 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 into it.What is the probability of :getting a number greater than 6.

Answer» Question 4(iii)

Numbers 1 to 10 is 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 into it.What is the probability of :

getting a number greater than 6.
8.

In the given figure, ABCD is a parallelogram. Find x.

Answer» In the given figure, ABCD is a parallelogram. Find x.


9.

Explain what is ψ and ψ^2.

Answer» Explain what is ψ and ψ^2.
10.

In the graph given below,How many maximum values does y can have for one value of x?

Answer»

In the graph given below,

How many maximum values does y can have for one value of x?




11.

Test the divisibility of each of the following numbers by 9:(i) 327(ii) 7524(iii) 32022(iv) 64302(v) 89361(vi) 14799(vii) 66888(viii) 30006(ix) 33333

Answer» Test the divisibility of each of the following numbers by 9:

(i) 327

(ii) 7524

(iii) 32022

(iv) 64302

(v) 89361

(vi) 14799

(vii) 66888

(viii) 30006

(ix) 33333
12.

If p =3^4×5^2,q =2^4×7×5^m,r =3^8×2^n and HCF (q,r)=2^3×3^x and HCF (p,q)=5 then find the values of m,n and x respectively

Answer» If p =3^4×5^2,q =2^4×7×5^m,r =3^8×2^n and HCF (q,r)=2^3×3^x and HCF (p,q)=5 then find the values of m,n and x respectively
13.

the largest interval for which x^{12}-x^9+x^4-x+1>0 is

Answer» the largest interval for which x^{12}-x^9+x^4-x+1>0 is
14.

The estimate of ∫1.50.5dxx obtained using Simpson's rule with three-point function evaluation exceeds the exact value by

Answer»

The estimate of 1.50.5dxx obtained using Simpson's rule with three-point function evaluation exceeds the exact value by

15.

Question 1(i) A survey was made to find the type of music that a certain group of young people liked in a city. The adjoining pie chart shows the findings of this survey. From this pie chart, answer the following: If 20 people liked classical music, how many young people were surveyed?

Answer» Question 1(i)
A survey was made to find the type of music that a certain group of young people liked in a city.
The adjoining pie chart shows the findings of this survey.
From this pie chart, answer the following:

If 20 people liked classical music, how many young people were surveyed?
16.

In exchange of a square plot one of sides is 84 m a man wants to buy a rectangular plot 144 m long and of the same area as of the square plot . Find the width of the rectangular plot.

Answer» In exchange of a square plot one of sides is 84 m a man wants to buy a rectangular plot 144 m long and of the same area as of the square plot . Find the width of the rectangular plot.
17.

Choose a rational number between 15 and 13.

Answer»

Choose a rational number between 15 and 13.

18.

Question 65 40+50+60=(4+5+6)0

Answer»

Question 65

40+50+60=(4+5+6)0

19.

16 If each edge of a cube is increased by 50%, then find the percentage increase in its surface area.

Answer» 16 If each edge of a cube is increased by 50%, then find the percentage increase in its surface area.
20.

Is it possible for the square of a number to end with 5 zeroes? Give reason.

Answer»

Is it possible for the square of a number to end with 5 zeroes? Give reason.

21.

Mark the correct alternative in each of the following:If x = (−10) + (−10) + ... 15 times and y = (−2) × (−2) × (−2) × (−2) × (−2), then x − y = (a) 118 (b) −118 (c) −182 (d) 182

Answer» Mark the correct alternative in each of the following:



If x = (−10) + (−10) + ... 15 times and y = (−2) × (−2) × (−2) × (−2) × (−2), then x − y =



(a) 118 (b) −118 (c) −182 (d) 182
22.

Find the mean for 3, 20, 15 and 10?

Answer»

Find the mean for 3, 20, 15 and 10?



23.

The quotient obtained when we divide a6−b6 by the product of a2+ab+b2 and a−b.

Answer»

The quotient obtained when we divide a6b6 by the product of a2+ab+b2 and ab.



24.

Question 15A vertical pole of a length 6 m casts a shadow 4m long on the ground and at the same time a tower casts a shadow 28 m long. Find the height of the tower.

Answer» Question 15

A vertical pole of a length 6 m casts a shadow 4m long on the ground and at the same time a tower casts a shadow 28 m long. Find the height of the tower.
25.

Simiplify: (7a−6b+5c)2+(7a+6b−5c)2

Answer» Simiplify: (7a6b+5c)2+(7a+6b5c)2
26.

Simplify: 1−2x+x21−x3×1+x+x21+x

Answer» Simplify: 12x+x21x3×1+x+x21+x
27.

Mina makes a cuboid of plasticine of sides 7cm,5cm,7cm. How many such cuboids will she need to form a cube

Answer»

Mina makes a cuboid of plasticine of sides 7cm,5cm,7cm. How many such cuboids will she need to form a cube

28.

Pair the highlighted numbers to their place values.

Answer»

Pair the highlighted numbers to their place values.

29.

Square root of 0.0256

Answer»

Square root of 0.0256

30.

The sum of three consecutive even numbers is 36. The smallest among them is :

Answer»

The sum of three consecutive even numbers is 36. The smallest among them is :


31.

A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the 45th division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet is the main scale reading is 0.5 mm and the 25th division coincides with the main scale line?

Answer»

A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the 45th division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet is the main scale reading is 0.5 mm and the 25th division coincides with the main scale line?


32.

Question 2(i) The following line graph shows the yearly sales figures for a manufacturing company. What were the sales in (i) 2002 (ii) 2006?

Answer» Question 2(i)
The following line graph shows the yearly sales figures for a manufacturing company.

What were the sales in (i) 2002 (ii) 2006?
33.

Find the area of a quadrilateral ABCD inwhich AB=3 cm, BC=4 cm, CD=4 cm, DA=5 cm and AC=5 cm

Answer» Find the area of a quadrilateral ABCD in

which AB=3 cm, BC=4 cm, CD=4 cm, DA=5 cm and AC=5 cm


34.

The data of weekly wages of workers of a factory is given below. Weekly Wages Number of Workers 800 - 999 20 1000 - 1199 14 1200 - 1399 17 1400 - 1599 25 1600 - 1799 9 1800 - 1999 12 Convert the above table in the form of exclusive class intervals.

Answer»

The data of weekly wages of workers of a factory is given below.

Weekly Wages Number of Workers
800 - 999 20
1000 - 1199 14
1200 - 1399 17
1400 - 1599 25
1600 - 1799 9
1800 - 1999 12

Convert the above table in the form of exclusive class intervals.


35.

The side of a square ABCD is 5 cm and another square PQRS has perimeter equal to 40 cm. Find the ratio of the perimeter of ABCD to perimeter of PQRS. Find the ratio of the area ABCD to the area of PQRS.

Answer»

The side of a square ABCD is 5 cm and another square PQRS has perimeter equal to 40 cm. Find the ratio of the perimeter of ABCD to perimeter of PQRS. Find the ratio of the area ABCD to the area of PQRS.

36.

If AC = 10cm, PC=15cm and AB=6cm. Find PB?

Answer»

If AC = 10cm, PC=15cm and AB=6cm. Find PB?


37.

Question 3Construct the Parallelogram HEAR whereHE=5cm, EA=6cm, ∠R=85∘

Answer»

Question 3

Construct the Parallelogram HEAR where

HE=5cm, EA=6cm, R=85



38.

Simplify: (m2−n2m)2+2m3n2

Answer»

Simplify: (m2n2m)2+2m3n2

39.

The price of sugar is increased by 25%. If a family wants to keep its expenses on sugar unaltered, then the family will have to reduce the consumption of sugar by

Answer»

The price of sugar is increased by 25%. If a family wants to keep its expenses on sugar unaltered, then the family will have to reduce the consumption of sugar by

40.

Subtract 123 from 313.

Answer» Subtract 123 from 313.
41.

(−23) + 57 = ?

Answer»

(23) + 57 = ?


42.

In what time will 64000 amount to 68921 at 5% per annum interest being compounded half yearly?

Answer»

In what time will 64000 amount to 68921 at 5% per annum interest being compounded half yearly?

43.

Using suitable identity find the value of 982

Answer» Using suitable identity find the value of 982
44.

Factorise: x2+6x+9−x−3

Answer»

Factorise: x2+6x+9x3



45.

If x and y vary inversely, then findx2 and y3. x 25 x2 552 y 60 55 y3

Answer» If x and y vary inversely, then find

x2 and y3.

















x 25 x2 552
y 60 55 y3


46.

Factorise Completely : x2−y2−2x+2y

Answer»

Factorise Completely : x2y22x+2y

47.

Question 19The probability that a non-leap your selected at random will contains 53 Sunday is(a) 17(b) 27(c) 37(d) 57

Answer» Question 19

The probability that a non-leap your selected at random will contains 53 Sunday is

(a) 17

(b) 27

(c) 37

(d) 57
48.

32. if Z1,Z2 are two nonzero complex number such that |Z1+Z2|=|Z1| +|Z2| then amp (Z1/Z2) is equal too

Answer» 32. if Z1,Z2 are two nonzero complex number such that |Z1+Z2|=|Z1| +|Z2| then amp (Z1/Z2) is equal too
49.

Question 70 (iii)Using Euler's formula. Find the value of unknown. Faces 9vertices zEdges 16

Answer» Question 70 (iii)



Using Euler's formula. Find the value of unknown.



Faces 9

vertices z

Edges 16
50.

A batsman is holding a 1 m long bat in his hand. To make a shot, the batsman swings the bat through an angle of 60 °. His arm length is 75 cms. Considering his hand and the bat acting as a straight line, what will be the area swept by the bat.

Answer»

A batsman is holding a 1 m long bat in his hand. To make a shot, the batsman swings the bat through an angle of 60 °. His arm length is 75 cms. Considering his hand and the bat acting as a straight line, what will be the area swept by the bat.