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Question 57: (a) Define density. What is the SI unit of densit
Physics by Lakhmir Singh
Physics

Class 9

Lakhmir Singh

Author:
Lakhmir Singh
Publisher:
S. Chand
Subject:
Science
1

Chapter 1: Motion

117 questions

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2

Chapter 2: Force and Laws of Motion

114 questions

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3

Chapter 3: Gravitation

157 questions

Q1
Question 56: (a) State the principle of flotation.
(b) A floating boat displaces water weighing 6000 newtons.
(i) What is the buoyant force on the boat?
(ii) What is the weight of the boat?
Q2
Question 57: (a) Define density. What is the SI unit of density?
(b) Define relative density. What is the SI unit of relative density?
(c) The density of turpentine is 840 kg/m3. What will be its relative density? (Density of water = 1000 kg/m3)
Q3
Question 58: (a) Define pressure.
(b) What is the relation between pressure, force and area?
(c) Calculate the pressure when  a force of 200 N is exerted on an area of :
(i) 10 m2
(ii) 5 m2
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4

Chapter 4: Work and Energy

128 questions

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5

Chapter 5: Sound

162 questions

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Question

Question 57: (a) Define density. What is the SI unit of density?
(b) Define relative density. What is the SI unit of relative density?
(c) The density of turpentine is 840 kg/m3. What will be its relative density? (Density of water = 1000 kg/m3)

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Question 57: (a) Define density. What is the SI unit of density?
(b) Define relative density. What is the SI unit of relative density?
(c) The density of turpentine is 840 kg/m3. What will be its relative density? (Density of water = 1000 kg/m3)
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Answer: (a) Density is defined as the mass per unit volume of a substance. The symbol for density is ρ. Mathematically, density is defined as

The SI unit of density is kg/m3.

(b) Relative density of a substance is the ratio of density of the substance to the density of water. Relative density has no unit.

(c)


Ans: Relative density of turpentine = 0.84.
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Question Text
Question 57: (a) Define density. What is the SI unit of density?
(b) Define relative density. What is the SI unit of relative density?
(c) The density of turpentine is 840 kg/m3. What will be its relative density? (Density of water = 1000 kg/m3)
TopicGravitation
SubjectScience
ClassClass 9
Answer TypeText solution:1
Upvotes24