## RS Aggarwal Solutions Class 8 Chapter-20 Volume and Surface Area of Solids (Ex 20A) Exercise 20.1 - Free PDF

## FAQs on RS Aggarwal Solutions Class 8 Chapter-20 Volume and Surface Area of Solids (Ex 20A) Exercise 20.1

**1. The length of a geometry box is 20 cm, its breadth is 5 cm, and has height of 1 cm. Find the volume of the geometry box.**

Given,

The length of geometry box = 20 cm

The length of geometry box = 5 cm

The length of geometry box = 1 cm

The geometry box is in the shape of a cuboid.

So, the Volume of the geometry box is the same as the Volume of the cuboid.

The Volume of cuboid = lbh

Volume of geometry box = 20 cm * 5 cm * 1 cm = 100 cubic cm.

Hence, the Volume of the cuboid is 100 cubic cm.

**2. A cheese cube has a length of 5 cm and is further cut into smaller cubes which have a volume of 1 cubic cm each. Find the number of such smaller cubes obtained.**

Given,

Length of larger cube = 5cm

The Volume of cube = side3

The Volume of the larger cube = 53 = 125 cubic cm.

Number of cubes obtained = (Volume of the larger cube)/(Volume of smaller cubes)

Number of cubes = 125/1 = 125

Hence, the number of cubes obtained after cutting them into smaller cubes is 125.

**3. Where can I find useful Math study materials for Class 9?**

Everything you need can be found on the Vedantu app or website. These resources are created by experts in the field, and the information is accurate and dependable. Students will be able to find revision notes, important questions, question papers, and much more! There are no fees or costs associated with these study materials. All students need to do is sign in, and then they can download whatever they want in pdf format. You can benefit from these free resources, which will undoubtedly help you ace your exams.

**4. How can I do well in Class 8 Math?**

The only way to do well in Class 9 Maths is to practise. Complete all of the Chapter exercises. This will enhance your problem-solving abilities as well as your speed and efficiency. Important formulas, definitions, and equations can be written down in a notebook and reviewed on a regular basis. Solve previous year's sample papers and question papers within a time limit. This will familiarise you with the paper pattern and question type, as well as help you improve your time management skills. Revise on a regular basis to ensure that you retain everything you've learned for a longer period of time.

**5. A rectangular water reservoir contains 105 m ^{3} of water. Find the depth of the water in the reservoir if its base measures 12 m by 3.5 m.**

Given details are,

The capacity of water reservoir = 105 m^{3}

Length of base of reservoir = 12 m

Width of base = 3.5 m

Let the depth of reservoir be ‘hm

l × b × h = 105

h = 105 / (l × b)

= 105 / (12×3.5)

= 105/42

= 2.5m

∴ The depth of the reservoir is 2.5 m