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Physics
Class 9
Lakhmir Singh
1
Chapter 1: Motion
117 questions
2
Chapter 2: Force and Laws of Motion
114 questions
3
Chapter 3: Gravitation
157 questions
Q1
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
(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
Q2
Question 59:
(a) What are fluids? Name two common fluids.
(b) State Archimedes' principle.
(c) When does an object float or sink when placed on the surface of a liquid?
(b) State Archimedes' principle.
(c) When does an object float or sink when placed on the surface of a liquid?
Q3
Question 62:
An object weighs 10 N in air. When immersed fully in a liquid, it weighs only 8 N. The weight of liquid displaced by the object will be :
(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N
View all question(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N
4
Chapter 4: Work and Energy
128 questions
5
Chapter 5: Sound
162 questions
Question
Question 59:
(a) What are fluids? Name two common fluids.
(b) State Archimedes' principle.
(c) When does an object float or sink when placed on the surface of a liquid?
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Text solution
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Answer:
(a) A substance which can flow is called fluid. The common fluids are juice, water, and soup.
(b) Archimedes’ principle states that “when a body is immersed partially or completely in a fluid (liquid or gas), it experiences an upthrust or buoyant force that is equal to the weight of the fluid displaced by body.”
(c) When an object is placed on the surface of water, two forces act on the object:
(i) The gravitational force that act in the downward direction.
(ii) The upthrust or the buoyant force that act in the upward direction.
An object floats on the surface of water if the upthrust of water on the object is greater than the weight of the object. An object sinks if the weight of the object is greater than the upthrust of water on the object.
(b) Archimedes’ principle states that “when a body is immersed partially or completely in a fluid (liquid or gas), it experiences an upthrust or buoyant force that is equal to the weight of the fluid displaced by body.”
(c) When an object is placed on the surface of water, two forces act on the object:
(i) The gravitational force that act in the downward direction.
(ii) The upthrust or the buoyant force that act in the upward direction.
An object floats on the surface of water if the upthrust of water on the object is greater than the weight of the object. An object sinks if the weight of the object is greater than the upthrust of water on the object.
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Practice more questions from Physics (Lakhmir Singh)
Q1
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
(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
Q2
Question 59:
(a) What are fluids? Name two common fluids.
(b) State Archimedes' principle.
(c) When does an object float or sink when placed on the surface of a liquid?
(b) State Archimedes' principle.
(c) When does an object float or sink when placed on the surface of a liquid?
Q3
Question 62:
An object weighs 10 N in air. When immersed fully in a liquid, it weighs only 8 N. The weight of liquid displaced by the object will be :
(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N
View all(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N
Practice questions from Physics (Lakhmir Singh)
Question 1
Views: 6,098
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(b) The force of gravitation between two objects depends on the nature of medium between them.
(c) The value of G on the moon is about one-sixth of the value of G on the earth.
(d) The acceleration due to gravity acting on a freely falling body is directly proportional to the mass of the body.
(e) The weight of an object on the earth is about one-sixth of its weight on the moon.
Question 2
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(a) if a cork is placed in water?
(b) if a piece of heavy metal is placed in it?
Question 3
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| Question Text | Question 59:
(a) What are fluids? Name two common fluids. (b) State Archimedes' principle. (c) When does an object float or sink when placed on the surface of a liquid? |
| Topic | Gravitation |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 |
| Upvotes | 56 |
