Question

Hello Sir/Madam, can you please tell me about the Mizo's movement of 1810

Answer 1

C

BSE

X

|

MATHEMATICS

Board

Paper

˗

2018

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4

OR

A heap of rice is in

the form of a cone of base diameter 24 m and height 3.5 m.

Find the volume of the rice. How much canvas cloth is required to just cover the

heap?

21.

Find the area of the shaded region in Fig.3, where

are

a

s

drawn with centres A,B,C

and

D

intersect in pairs at

mid

-

points P,

Q,

R and S of the sides AB, BC, CD and DA

respectively of a square ABCD of side 12 cm (Use



= 3.14)

22.

4 sin -cos

1

if 4 tan =3, evaluate

4 sin - cos - 1

 











OR

If tan 2A = cot (A

-

18

o

), where 2A is an acute angle, find the value of A.

SECTION

–

D

Question numbers

23

to

30

carry

4

marks each.

23.

As observed from the top of a 100 m high light house from the sea

-

level, the angles

of depression of two ships are 30

o

and 45

o

.

If

one ship is exactly behind the other on

the same side of the light house, find

the distance between the two ships

.

(Use 3=1.732)

24.

The diameters of the lower and upper ends of a bucket in the form of a frustum of a

cone are 10 cm and 30 cm respectively. If its height is 24 cm,

find:

(i)

The area of the metal sheet used to

make the bucket.

(ii)

Why we should avoid the bucket made by ordinary plastic? (Use



= 3.14)

25.

3

3

s in A-2 sin A

Prove that :

tan A.

2 cos A cos A





26.

The mean of the following distribution is 18. Find the