# Surface Area Sphere And Hemisphere Free Doubts and Solutions

### CBSE - IX - Mathematics - Surface Areas and Volumes

## Two hemispherical bowls are formed by cutting a spherical ball of diameter 28 cm from the centre. Calculate the total surface area of each of the hemispherical bowls so formed.

**Topperlearning User**18th October 2017, 3:25 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A pillar has a spherical top of radius 20 cm. Find the cost of polishing the top of 35 such pillars at the rate of Rs 30 per m2.

**Topperlearning User**18th October 2017, 3:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A tomb 21 m high is in the form of a cylinder surmounted by a hemisphere of radius 7 m. Find the total surface area of the tomb.

**Topperlearning User**18th October 2017, 3:21 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## The radius of a spherical balloon increases from 3.5 cm to 4.2 cm as air is being pumped into it, find the ratio of surface areas of the balloon in the two cases.

**Topperlearning User**18th October 2017, 3:20 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical bowl made of brass has inner radius 3.5 cm. Find the cost of tin-plating it on the inside at the rate of Rs 20 per 100 cm2.

**Topperlearning User**18th October 2017, 3:17 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A spherical metal ball has radius 4.2 cm. Find the cost of polishing 10 such balls at the rate of Rs 5 per 100 cm2.

**Topperlearning User**18th October 2017, 3:15 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## The radius of a spherical balloon increases from 2.8 cm to 3.5 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases

**Topperlearning User**18th October 2017, 3:13 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical dome of a fort needs to be polished. If the circumference of the base of the dome is 27.72 m, find the cost of polishing it at the rate of Rs 25 per 1000 cm2.

**Topperlearning User**18th October 2017, 3:10 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical metal bowl has thickness 0.21 cm. The inner radius of the bowl is 7 cm. Find the outer curved surface area of the bowl.

**Topperlearning User**18th October 2017, 3:07 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## The hollow sphere, in which the circus motorcyclist performs his stunts, has a radius of 2.8 m. find the area available to the motorcyclist for riding.

**Topperlearning User**18th October 2017, 3:03 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## If the circumference of the base, a hemispherical dome of a building is 352 cm, find the lateral surface area of the dome.

**Topperlearning User**18th October 2017, 3:02 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A toy is in the form of a hemisphere surmounted by a cone of radius 3 cm and height 4 cm. Calculate the surface area of the toy.

**Topperlearning User**18th October 2017, 2:58 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical bowl is made of steel, 0.7 cm thick has inner radius 14 cm. It is to be polished from inside and outside. Calculate the total area to be polished.

**Topperlearning User**18th October 2017, 2:56 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## Ideas for a still model on any mathematical concept.

**ABHILASHA**26th May 2017, 1:41 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## Which type of questions coming in my exams 20 March 2017
I

**Esha Gupta**20th March 2017, 7:51 AM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A sphere, cylinder and cone are of the same radius and same height. Find the ratio of their curved surfaces.

**dimplesharma0810**5th March 2016, 9:54 AM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A spherical ball of lead 3 cm in radius is melted and recast into 3 spherical balls, if the radii 2 balls are 3/2 cm and 2 cm, find the diameter of the third ball ?

**nisha_vini29**22nd February 2016, 10:36 AM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## what is the best example of surface area and volume in our daily life

**sanjeev.mami**11th October 2015, 5:17 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in two cases.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical bowl is made of steel 0.25 cm thick. The inner radius of the bowl is 5 cm. Find the outer curved surface area of the bowl.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical dome of a building needs to be painted. If the circumference of the base of the dome is 17.6 m, find the cost of painting it, given the cost of painting is Rs 5 per 100 cm2.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## The radius of a spherical balloon increases from 7 cm to 14 cm as air is pumped into it. Find the ratio of surface areas of the balloon in two cases.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## A hemispherical dome of a building needs to be painted. If the circumference of the base of the dome is 17.6 m, find the cost of painting it, given the cost of painting is Rs. 5 per 100 cm2.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## (i) The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.(ii) A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of Rs.16 per 100 cm2.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Surface Areas and Volumes

## Twenty seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the(i) radius r' of the new sphere, (ii) ratio of S and S'.

**Topperlearning User**4th June 2014, 1:23 PM