Question Answers

8. A solid cube of side 12 cm is cut into eight cubes of equal volume. What will be the side of the new cube? Also, find the ratio between their surface areas. 8. A solid cube of side 12 cm is cut into eight cubes of equal volume. What will be the side of [...]

7. A godown measures 40 m×25m×15 m. Find the maximum number of wooden crates each measuring 1.5m×1.25 m×0.5 m that can be stored in the godown. 7. A godown measures 40 m×25m×15 m. Find the maximum number of wooden crates each measuring 1.5m×1.25 m×0.5 m that can be stored in the godown. October 17, 2020 [...]

A nucleus, absorbing a neutron, emits an electron to go over to neptunium which on further emitting an electron goes over to plutonium. How would you represent the resulting plutonium? A nucleus absorbing a neutron emits an electron to go over to neptunium which on further emitting an electron goes over to plutonium. How would [...]

6. A village, having a population of 4000, requires 150 litres of water per head per day. It has a tank measuring 20 m × 15 m × 6 m. For how many days will the water of this tank last? 6. A village having a population of 4000 requires 150 litres of water per [...]

5. The capacity of a cuboidal tank is 50000 litres of water. Find the breadth of the tank, if its length and depth are respectively 2.5 m and 10 m. 5. The capacity of a cuboidal tank is 50000 litres of water. Find the breadth of the tank if its length and depth are respectively [...]

A radioactive nucleus undergoes a series of decay according to the scheme A to A1 to A3 to A4 If the mass number and atomic number of A are 180 and 72, respectively, what are these number for A4 ? A radioactive nucleus undergoes a series of decay according to the scheme A to A1 [...]

4. Find the cost of digging a cuboidal pit 8m long, 6m broad and 3m deep at the rate of Rs 30 per m^3. 4. Find the cost of digging a cuboidal pit 8m long 6m broad and 3m deep at the rate of Rs 30 per m^3. October 17, 2020 Category: Chapter 13 - [...]

3. A cuboidal vessel is 10m long and 8m wide. How high must it be made to hold 380 cubic metres of a liquid? 3. A cuboidal vessel is 10m long and 8m wide. How high must it be made to hold 380 cubic metres of a liquid? October 17, 2020 Category: Chapter 13 - [...]

A uranium nucleus (atomic number 92, mass number 231) emits an alpha particle and the resultant nucleus emits a beta particle. What are the atomic and mass numbers of the final nucleus? A uranium nucleus (atomic number 92 mass number 231) emits an alpha particle and the resultant nucleus emits a beta particle. What are [...]

2. A cuboidal water tank is 6m long, 5m wide and 4.5m deep. How many litres of water can it hold? (1 m^3= 1000 l) 2. A cuboidal water tank is 6m long 5m wide and 4.5m deep. How many litres of water can it hold? (1 m^3= 1000 l) October 17, 2020 Category: Chapter [...]