ASSIGNMENT – 4 CLASS VIII SUBJECT MATHEMATICS (Direct ...

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(Direct & Inverse Variation. Mensuration. Visualising Solid Shapes). (1). If x and y very inversely as each other and x = 30 when y = 80, then what is the value of.
ASSIGNMENT – 4 CLASS VIII SUBJECT MATHEMATICS (Direct & Inverse Variation Mensuration Visualising Solid Shapes) (1)

If x and y very inversely as each other and x = 30 when y = 80, then what is the value of y when x = 40

(a)

20

(b)

30

(c )

40

(d)

60

(2)

If Neha takes 25 steps to cover a distance of 20 meters, What distance will be cover in 315 steps ?

(a)

310 meters

(b)

(3)

3 persons can build a wall in 4 days, then 4 persons can build it in :

(a)

5 1/3 days

(4)

A car is travelling at a uniform speed of 75 KM / Hr How much distance will it cover in

(b)

30

(c )

3 days

40

(c )

(d)

60

4 1/3 days

(d)

none of these

20 minutes (5)

6 pipes fill a tank in 120 minutes, then 5 pipes will fill it in

(a)

100 min

(6)

The ratio of radii of two cylinders is 2 : 3 and the ratio of their heights is 5:3 the ratio of

(b)

144 min

(c )

140 min

(d)

108min

their volumes will be (a)

4:9

(b)

9:4

(c )

20:27 (d)

27:20

(7)

Five equal cubes, each of edge 5 cm, are placed adjacent to each other the volume of the cuboid so formed is

(a)

125 cm3

(8)

A rectangular water tank is 3m long, 2m wide and 5m high how many liters of water can

(b)

375 cm3

(c )

525 cm3

(d)

625 cm3

it hold ? (9)

The dimensions of cube are doubled. By how many times will its volume and surface area increase ?

(10)

How many cubes of 10 cm edge can be put in a cubical box of 1 m edge

(a)

10

(b)

100

(c)

1000 (d)

10000

(11)

The number of coins, each of radius 0.75 cm and thickness 0.2 cm, to be melted to make a right circular cylinder of height 8 cm and base radius 3 cm is :

(a)

460

(b)

500

(c)

(12)

The diagonal of a cube is 3 cm long. Find its total surface area .

(13)

Write down number of edges of Rectangular pyramid.

(14)

Write down number of vertices of:

(a)

Triangular

(15)

How many faces are there in a :

(a)

Square pyramid

(16)

Verify Euler’s relation for each of the following :

(a)

A square

(b)

(b)

(b)

600

(d)

640

Tetetrahedron

Cuboid

pentagonal pyramid