Skip to main content

Exercise

Exercise - 28

  1. A solid is in the form of a right circular cone mounted on a hemisphere. The radius of the hemisphere is 2.1cm and the height of the cone is 4cm. The solid is placed in a cylindrical tub, full of water, in such a way that the whole solid is submerged in water. If the radius of the cylinder is 5cm and its height is 9.8cm, find the volume of the water left in the cylindrical tub.
  2. A solid wooden toy is in the shape of a right circular cone mounted on a hemisphere. If the radius of the hemisphere is 4.2cm and the total height of the toy is 10.2cm, find the volume of the wooden toy.
  3. A toy is in the form of a cone mounted on a hemisphere of radius 7cm. The total height of the toy is 14.5cm. Find the volume and the total surface area of the toy..
  4. A toy is in the form of a cone mounted on a hemisphere of radius 3.5cm. The total height of the toy is 15.5cm. Find the total surface area and the volume of the toy.
  5. A building is in the form of a hemispherical vaulted done and contains of air. If the internal diameter of the building is equal to its total height above the floor, find the height of the building.A circus tent is in the shape of a cylinder surmounted by a cone. The diameter of the cylindrical part is 24m and its height is 11m. If the vertex of the tent is 16m above the ground, find the area of canvas required to make the tent.An iron pillar has some part in the form of a right circular cylinder and remaining in the form of a right circular cone. The radius of the base of each of cone and cylinder is 8cm. The cylindrical part is 240cm high and the conical part is 36cm light. Find the weight of the pillar if one cu.cm of iron weight 7.8 grams.A circus tent is made of canvas and is in the form of a right circular cylinder and a right circular cone above it. The diameter and height of the cylindrical part of the tent are 176m and 5m respectively. The total height of the tent is 21m. Find the total cost of the tent if the canvas used costs Rs. 12 per square meter.A circus tent has cylindrical shape surmounted by a conical roof. The radius of the cylindrical base is 20m. The height of cylindrical and conical portions are 4.2m and 2.1m respectively. Find the volume of tent.A petrol tank is a cylinder of base diameter 21cm and 18cm length fitted with conical ends each of axis length 9cm. determine the capacity of the tank.

Answers

1. 732.12cu cm

2. 266.11cm

3. 231cm3, 203.94cm2

4. 214.5cm2,243.8 cm3

5. 4m

6. 1320m2

7. 395.37kg

8. Rs. 178200

9. 6160m

10. 8316cm3

 

 

 


Labels

Labels:

Comments

Post a Comment

Popular posts from this blog

The Missing Mail | Class IX - Interact in English

NCERT / CBSE Literature Reader for English Course (Communicative) Important Exercise Questions Q.3: (a) Why is Ramanujam worried about getting his daughter married? Give four reasons. (b) How does the postman console and guide Ramanujam and his family during each of the instances you have listed in 3 (a)? Ans 3(a): Ramanujam is worried as he could not find a suitable match to marry his daughter off which was getting delayed because of different reasons. The four causes of his worriedness are - (i) Sometimes horoscopes did not match, (ii) Sometimes the girl’s appearance were not approved, (iii) At times there were problems of too much dowry and other financial matters, (iv) The season was closing with only three more auspicious dates left, whereas, he was not able to finalise any alliance by that time. Ans 3(b): First instance - When Ramanujam said that horoscopes did not agree Thanappa consoled and guided him by saying that he should not utter inauspicious words and when the God wills ...
Post a Comment
Read more

Chivvy (Class VII - English Honeycomb - Chapter 4)

NCERT Textbook Exercise Questions (Important only) Working with the Poem Q.2: The last two lines of the poem are not prohibitions or instructions. What is the adult now asking the child to do? Do you think the poet is suggesting that this is unreasonable? Why? Ans: In the last two lines the adults are asking the child to think himself and to be independent in taking decisions in some matters. The adults are asking to be firm and determined which is unreasonable because they themselves don’t allow the child to take any decision. They always tell him what to do or what not to do. So, their asking the child to make up his own mind is totally unreasonable. Q.3: Why do you think grown-ups say the kind of things mentioned in the poem? Is it important that they teach children good manners, and how to behave in public? Ans: The grown-ups say such kind of things to their children in order to teach those good manners, etiquettes and how to behave in public. It is important to teach the children ...
30 comments
Read more

POLITICAL SCIENCE CLASS X CBSE - POLITICAL PARTIES

POLITICAL SCIENCE CLASS X CBSE POLITICAL PARTIES CHALLENGES TO POLITICAL PARTIES We know that how crucial political parties are for the democracy. They are the most visible face of the democracy and people blame them for whatever is wrong in the working of democracy. This is a case of our country too. Popular dissatisfaction and criticism has focused on four problem areas in the working of political parties. 1. LACK OF INTERNAL DEMOCRACY (with in the party): all over the world there is a tendency in the political parties towards the concentration of power in one or few leaders at the top. --parties do not keep membership registers, do not hold organizational meetings and conduct internal elections regularly. --ordinary members do not get sufficient information on what happens inside the party. --leaders assume greater power to make decisions in the name of party. --more than loyalty to the party principles and policies, personal loyalty to the lead...
12 comments
Read more