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Why is it easier to swim in seawater than in river water?

Important Questions on Gravitation

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9th CBSE
IMPORTANT
Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 24
Two different objects are completely immersed in water and undergo same loss in weight. Is it necessary that the weights of these objects in air be also the same?
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9th CBSE
IMPORTANT
Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 25
If two equal weights of unequal volumes are balanced in air, what will happen when these are completely dipped in water?
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9th CBSE
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Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 26
The following figures show three identical blocks of wood floating in three different liquids A,B and C of densities d1, d2 and d3 respectively. Which of these has the highest density? Give a reason to justify your answer.

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9th CBSE
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Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 27
There are four balls A, B, C and D which displace 10 ml, 24 ml, 15 ml, and 12 ml of a liquid respectively when immersed completely. Which ball will undergo the maximum apparent loss in weight?
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9th CBSE
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Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 28
During an experiment, on measurement of loss in weight of solid in tap water and salty water, when will be the maximum loss in weight of the solid observed? 
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9th CBSE
IMPORTANT
Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 29
Nitya is visiting her relatives in Bhopal. One day her aunt expressed unhappiness with the milk supplied by the milkman. She complained of adulterated milk. Nitya asked her to buy an instrument to check the purity of milk. Next day, the supplied milk was tested and found that water was being mixed in the milk. Nitya’s aunt informed all her neighbours about the instrument.
What values were shown by Nitya, her aunt and the milkman, respectively? 
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9th CBSE
IMPORTANT
Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 29

Nitya is visiting her relatives in Bhopal. One day her aunt expressed unhappiness with the milk supplied by the milkman. She complained of adulterated milk. Nitya asked her to buy an instrument to check the purity of milk. Next day, the supplied milk was tested and found that water was being mixed in the milk. Nitya’s aunt informed all her neighbors about the instrument.

Identify the instrument and the principle on which it is based?

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9th CBSE
IMPORTANT
Physics For Class 9>Chapter 3 - Gravitation>Exercise>Q 1
How can Archimedes’ principle be experimentally verified?