Picture-based MCQ Quiz

Three tennis balls are just packed in a cylindrical jar. If radius of each ball is r, volume of air inside the jar is

Figure 1 below is a solid cuboid made of unit cubes. Figure 2 is obtained after removing some unit cubes from figure 1.
Based on the figures shown above, the surface area of the cuboid in Figure 1 is
\(\_\_\_\_\) the surface area of the solid in Figure 2.

A container with a grey hemispherical lid has radius R cm . In figure 1, it contains water upto a height of \(\mathbf{R} \mathbf{~ c m}\). It is then inverted as shown in figure 2.

What is the height of water in figure 2?

Anishka melted 11 chocolate cubes in a cylindrical cup as shown.
If the length of the side of each cube is \(\boldsymbol{k} \mathbf{~ c m}\) and the radius of the cup is \(\boldsymbol{r} \mathbf{c m}\), which of these represents the height of the melted chocolate in the cup?
(Note: Take \(\pi=\frac{22}{7}\).)