Give me some numerical of class 8 based on chapter physical quantity and measurement
Answers
Select the correct alternative
(a) The correct relation is
1. Density = Mass X Volume
2. Mass = Density X Volume
3. Volume = Density X Mass
4. Density = Mass + Volume
Solution: The correct answer is 2. Mass = Density X Volume
(b) The relative density of alcohol is 0.8 its density is
1. 0.8
2. 800 kg
3. 800 g
4. 0.8 kg
Solution: The correct answer is 2. 800 kg
(c) A block of wood of density 0.8gcm-3 has a volume of 60cm3. The mass of the block is 1.
1. 60.8 g
2. 75 g
3. 48 g
4. 0.013 g
Solution: The correct answer is 3. 48 g
(d) The density of aluminium is 2.7g and that of brass. The correct statement is
1. Equal masses of aluminium and brass have equal volumes
2. The mass of a certain volume of brass is more than the mass of an equal volume of aluminium.
3. The volume of a certain mass of brass is more than the volume of an equal mass of aluminium.
4. Equal volumes of aluminium and brass have equal masses.
Solution: The correct answer is 2. The mass of a certain volume of brass is more than the mass of an equal volume of aluminium.
(e) A density bottle has a marking 25 mL on it. It means that:
1. the mass of density bottle is 25g
2. the density bottle will store 25 ml of any liquid in it
3. the density bottle will store 25 ml of water, but more volume of liquid denser than water.
4. the density bottle will store 25 ml of water, but more volume of a liquid lighter than water.
Solution: The correct answer is 2. the density bottle will store 25 ml of any liquid in it
(f) The correct statement is
1. The buoyant force on a body is equal to the volume of the liquid displaced by it
2. The buoyant force on a body is equal to the volume of the body
3. The buoyant force on a body is equal to the weight of the liquid displaced by it
4. The buoyant force on a body is always equal to the weight of the body.
Solution: The correct answer is 3. The buoyant force on a body is equal to the weight of the liquid displaced by it
(g) A piece of wood floats on water. The buoyant force on wood will be
1. zero
2. more than the weight of the wood piece
3. equal to the weight of the wood piece
4. less than the weight of the wood piece.
Solution: The correct answer is 3. equal to the weight of the wood piece
(h) The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will
1. sink
2. float with it some part outside the liquid
3. float just below the surface of the liquid
4. Float with the whole of its volume above the surface of the liquid.
Solution: The correct answer is 1. sink
Answer:
you have not written the correct unit of density the examiner will cut the question