1.
The height of a cylinder is 60 Cm and the diameter of its base is 5 Cm. The total surface area of the cylinder is :
Answer: Option 'C'
Given h = 60 Cm and r = 5/2 Cm
Total surface area = 2πrh + 2&pir2
= 2πr(h+r)
= [2 × 22/7 × 5/2 × (60 + 5/2)] Cm2
= [ 44/7 × 5/2 × ( (120 + 5)/2 ) ] Cm2
= 22/7 × 5 × 125/2 Cm2
= (55 × 125)/7 Cm2
= 6875/7 Cm2
= 982.14 Cm2
2.
The radius of a cylinder is 10 m, height 14 m. The volume of the cylinder is:
Answer: Option 'C'
Cylinder volume = πr2h
= 22/7 × 10 × 10 × 14
= 4400 m3
3.
The side of a cube is 8 m, Find the voiume?
Answer: Option 'C'
Cube Volume = a3
a3 = 83 = 512 m3
4.
The radius of a cone is 4 m, height 5 m. Find the curved surface area?
Answer: Option 'B'
Cone curved surface area = πrl = 22/7 × 4 × 5 = 440/7 = 62 6/7
Slant height (l) = √r2+h2 = √16+9 = √25 = 5
5.
Two cylinders of theis radius in the ratio 3 : 5 and heights in the ratio 10 : 9. Then find the volumes ratio?
Answer: Option 'D'
πR2H : πr2h
9 × 10 : 25 × 9
90 : 225
2 : 5