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 23:
What is the density of a substance of mass 100 g and volume 10 cm3?
Q2
Question 24:
Why does a block of wood held under water rise to the surface when released?
Q3
Question 26:
Fill in the following blanks with suitable words :
(a) The amount of force acting perpendicularly per unit area is called ____________.
(b) ____________ force makes the object appear lighter in water.
(c) A heavy ship floats on water because its ____________ density is less than that of water.
(d) In fluids (liquids and gases), pressure acts in ____________ directions and ____________ as the depth increases.
(e) In order to sink in a fluid, the density of an object must be ____________ than the density of the fluid.
(f) Snowshoes work by distributing the person’s ____________ over a much bigger ____________.
(g) If the area of a snowshoe is five times ____________ than the area of an ordinary shoe, then the pressure exerted by it would be five times ____________.
View all question(a) The amount of force acting perpendicularly per unit area is called ____________.
(b) ____________ force makes the object appear lighter in water.
(c) A heavy ship floats on water because its ____________ density is less than that of water.
(d) In fluids (liquids and gases), pressure acts in ____________ directions and ____________ as the depth increases.
(e) In order to sink in a fluid, the density of an object must be ____________ than the density of the fluid.
(f) Snowshoes work by distributing the person’s ____________ over a much bigger ____________.
(g) If the area of a snowshoe is five times ____________ than the area of an ordinary shoe, then the pressure exerted by it would be five times ____________.
4
Chapter 4: Work and Energy
128 questions
5
Chapter 5: Sound
162 questions
Question
Question 24: Why does a block of wood held under water rise to the surface when released?
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Text solution
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Answer:
A wooden block held under water floats on the surface on release because it is less dense than water. A substance floats if it is less dense than the fluid in which it is immersed after the external force is withdrawn from it.
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Practice more questions from Physics (Lakhmir Singh)
Q1
Question 23:
What is the density of a substance of mass 100 g and volume 10 cm3?
Q2
Question 24:
Why does a block of wood held under water rise to the surface when released?
Q3
Question 26:
Fill in the following blanks with suitable words :
(a) The amount of force acting perpendicularly per unit area is called ____________.
(b) ____________ force makes the object appear lighter in water.
(c) A heavy ship floats on water because its ____________ density is less than that of water.
(d) In fluids (liquids and gases), pressure acts in ____________ directions and ____________ as the depth increases.
(e) In order to sink in a fluid, the density of an object must be ____________ than the density of the fluid.
(f) Snowshoes work by distributing the person’s ____________ over a much bigger ____________.
(g) If the area of a snowshoe is five times ____________ than the area of an ordinary shoe, then the pressure exerted by it would be five times ____________.
View all(a) The amount of force acting perpendicularly per unit area is called ____________.
(b) ____________ force makes the object appear lighter in water.
(c) A heavy ship floats on water because its ____________ density is less than that of water.
(d) In fluids (liquids and gases), pressure acts in ____________ directions and ____________ as the depth increases.
(e) In order to sink in a fluid, the density of an object must be ____________ than the density of the fluid.
(f) Snowshoes work by distributing the person’s ____________ over a much bigger ____________.
(g) If the area of a snowshoe is five times ____________ than the area of an ordinary shoe, then the pressure exerted by it would be five times ____________.
Practice questions from Physics (Lakhmir Singh)
Question 1
Views: 5,736
Question 2
Views: 5,910
(a) less than that on the earth
(b) more than that on the earth
(c) same as that on the earth
(d) about one-sixth of that on the earth
Question 3
Views: 5,716
Question 4
Views: 5,114
(a) F1 is very much greater than F2
(b) F2 is very much greater than F1
(c) F1 is only a little grater than F2
(d) F1 and F2 are exactly equal
Practice more questions from Gravitation
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Question 2
Medium
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| Question Text | Question 24:
Why does a block of wood held under water rise to the surface when released? |
| Updated On | Feb 26, 2023 |
| Topic | Gravitation |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 60 |
| Avg. Video Duration | 2 min |
