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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 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 A substance floats if it is less dense than the fluid in which it is immersed after the external force is withdrawn from it.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: 6,313
(a) The buoyant force depends on the nature of object immersed in the liquid.
(b) Archimedes' principle can also be applied to gases.
Question 2
Views: 6,093
Figure
(a) W and X
(b) W and Y
(c) X and Y
(d) X and Z
Question 3
Views: 5,715
(b) What is the cause of buoyant force?
(c) When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons? (g = 10 m s−2)
Question 4
Views: 5,122
(a) is the same on equator and poles
(b) is the least on poles
(c) is the least on equator
(d) increases from pole to equator
Practice more questions from Gravitation
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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 |
