• Skip to main content
  • Skip to primary sidebar
  • Skip to footer
  • NCERT Solutions
    • NCERT Books Free Download
  • TS Grewal
    • TS Grewal Class 12 Accountancy Solutions
    • TS Grewal Class 11 Accountancy Solutions
  • CBSE Sample Papers
  • NCERT Exemplar Problems
  • English Grammar
  • MCQ Questions

CBSE Tuts

CBSE Maths notes, CBSE physics notes, CBSE chemistry notes

NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8

NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8 are part of NCERT Solutions for Class 9 Maths. Here we have given NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.

  • Surface Areas and Volumes Class 9 Ex 13.1
  • Surface Areas and Volumes Class 9 Ex 13.2
  • Surface Areas and Volumes Class 9 Ex 13.3
  • Surface Areas and Volumes Class 9 Ex 13.4
  • Surface Areas and Volumes Class 9 Ex 13.5
  • Surface Areas and Volumes Class 9 Ex 13.6
  • Surface Areas and Volumes Class 9 Ex 13.7
  • Surface Areas and Volumes Class 9 Ex 13.8
  • Surface Areas and Volumes Class 9 Ex 13.9
Board CBSE
Textbook NCERT
Class Class 9
Subject Maths
Chapter Chapter 13
Chapter Name Surface Areas and Volumes
Exercise  Ex 13.8
Number of Questions Solved 10
Category NCERT Solutions

NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8

Assume π = \(\cfrac { 22 }{ 7 } \) unless stated otherwise.
Ex 13.8 Class 9 Maths Question 1.
Find the volume of a sphere whose radius is
(i)  7 cm
(ii) 0.63 m
Solution.
(i) We have, r = 7 cm
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.1

Ex 13.8 Class 9 Maths Question 2.
Find the amount of water displaced by a solid spherical ball of diameter.
(i) 28 cm
(ii) 0. 21
Solution.
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.2
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.3

Ex 13.8 Class 9 Maths Question 3.
The diameter of a metallic ball is 4.2 cm. What is the mass of the ball, if the density of the metal is 8.9 g per cm3?
Solution.
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.4

Ex 13.8 Class 9 Maths Question 4.
The diameter of the Moon is approximately one-fourth of the diameter of the Earth. What fraction of the volume of the Earth is the volume of the Moon?
Solution.
Let diameter of the Earth be d2.
According to the question,
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.5

Ex 13.8 Class 9 Maths Question 5.
How many liters of milk can a hemispherical bowl of diameter 10 cm hold?
Solution.
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.6

Ex 13.8 Class 9 Maths Question 6.
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.
Solution.
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.7
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.8

Ex 13.8 Class 9 Maths Question 7.
Find the volume of a sphere whose surface area is 154 cm2.
Solution.
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.9

Ex 13.8 Class 9 Maths Question 8.
A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of Rs. 498.96. If the cost of white-washing is Rs. 2.00 per sq m, then find the
(i) inside surface area of the dome,
(ii) volume of the air inside the dome.
Solution.
Given, Cost of white – Washed = Rs. 498.96
and cost of whitewashed per sq.m = Rs. 2.00
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.10
Ex 13.8 Class 9 Maths Question 9.
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’.
Solution.
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.11

Ex 13.8 Class 9 Maths Question 10.
A capsule of medicine is in the shape of a sphere of diameter 3.3. How much medicine (in mm3) is needed to fill this capsule?
Solution.
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8.12

 

We hope the NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8 help you. If you have any query regarding NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.8, drop a comment below and we will get back to you at the earliest.

Primary Sidebar

NCERT Exemplar problems With Solutions CBSE Previous Year Questions with Solutoins CBSE Sample Papers

Recent Posts

  • MCQ Questions with Answers for Class 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, and 1 all Subjects
  • Angle, Types of Angles
  • AND gate is formed by using two? 1)OR 2)NAND 3)NOT 4)NOR
  • And expression for one minus the quotient of one and a number X?
  • What is average human body temperature in Kelvins?
  • How many moles of caffeine are in a cup, and how many molecules of caffeine?
  • How far will the car have traveled in that time?
  • What is its atomic number?
  • How many neutrons does it have?
  • An atom loses electrons to form what?
  • What is the atomic number of this atom?
  • Which one of these is the answer?
  • What is its concentration?
  • Can an equilateral triangle also be isosceles?
  • What is the charge of an alpha particle?

Footer

Maths NCERT Solutions

NCERT Solutions for Class 12 Maths
NCERT Solutions for Class 11 Maths
NCERT Solutions for Class 10 Maths
NCERT Solutions for Class 9 Maths
NCERT Solutions for Class 8 Maths
NCERT Solutions for Class 7 Maths
NCERT Solutions for Class 6 Maths

SCIENCE NCERT SOLUTIONS

NCERT Solutions for Class 12 Physics
NCERT Solutions for Class 12 Chemistry
NCERT Solutions for Class 11 Physics
NCERT Solutions for Class 11 Chemistry
NCERT Solutions for Class 10 Science
NCERT Solutions for Class 9 Science
NCERT Solutions for Class 7 Science
MCQ Questions NCERT Solutions
CBSE Sample Papers
cbse ncert
NCERT Exemplar Solutions LCM and GCF Calculator
TS Grewal Accountancy Class 12 Solutions
TS Grewal Accountancy Class 11 Solutions