Question : What will be the difference between the total surface area and the curved surface area of a hemisphere having a 4 cm diameter in cm²?

Option 1: $5\pi $

Option 2: $8\pi $

Option 3: $4\pi $

Option 4: $4.4\pi $

Question : The area of a square and rectangle are equal. The length of the rectangle is greater than the length of a side of the square by 10 cm and the breadth is less than 5 cm. The perimeter (in cm) of the rectangle is:

Option 1: 50

Option 2: 40

Option 3: 80

Option 4: 100

Question : The height of a cylinder is $\frac{2}{3}$rd of its diameter. Its volume is equal to the volume of a sphere whose radius is 4 cm. What is the curved surface area (in cm²) of the cylinder?

Option 1: $\frac{112}{3} \pi$

Option 2: $32 \pi$

Option 3: $\frac{128}{3} \pi$

Option 4: $40 \pi$

Question : The total surface area of a hemisphere is 462 cm². The diameter of this hemisphere is:

Option 1: 28 cm

Option 2: 21 cm

Option 3: 7 cm

Option 4: 14 cm

Question : If the volume of a sphere is 38808 cm³, then its surface area is:

Option 1: 5554 cm²

Option 2: 5574 cm²

Option 3: 5564 cm²

Option 4: 5544 cm²