The volume of a cuboid whose length, breadth and height are 8 cm, 5 cm and 3 cm respectively is :

1. 120 cm³

2. 122 cm³

3. 124 cm³

4. 128 cm³

The area of cross-section of a hosepipe is 3 cm². Water flows through it at a speed of 50 cm/sec. How many litres of water flows out of it in one minute?

1. 7 litres

2. 8 litres

3. 9 litres

4. 11 litres

The weight of a rectangular box with lid is 60 kg. The box filled with water weighs 600 kg. The weight of 1 litre of water is 1.2 kg. If the thickness of the box is 5 cm, and the external length and breadth of the box are 16 dm and 8.5 dm respectively, then the external height of the box is :

1. 5 dm

2. 6 dm

3. 7 dm

4. 8 dm

Case Study
The length, breadth and height of Kavita's bedroom are 6 m, 4 m and 3 m respectively. It has two equal windows, each of dimensions 1 m × 0.5 m. It also has a door of dimensions 2 m × 1 m.

Based on the above information, answer the following questions:

1. Area occupied by the door and the two windows is :
   (a) 1 m²
   (b) 2 m²
   (c) 2.5 m²
   (d) 3 m²

2. Kavita wants to whitewash the four walls of the room. Area to be whitewashed is :
   (a) 60 m²
   (b) 57 m²
   (c) 55 m²
   (d) 50 m²

3. Square tiles each of side 50 cm are laid on the floor of the room. The number of such tiles laid is :
   (a) 100
   (b) 98
   (c) 96
   (d) 72

4. Volume of air contained in the room is :
   (a) 72 m³
   (b) 70 m³
   (c) 60 m³
   (d) 52 m³

5. The length of the longest rod (to the nearest m) that can be placed in the room is :
   (a) 4 m
   (b) 5 m
   (c) 8 m
   (d) 7 m