Physics
Assertion (A) : An iron nail sinks in water, but floats in mercury.
Reason (R) : The density of iron is equal to density of mercury but greater than water.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Fluids Upthrust
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Answer
assertion is true but reason is false
Explanation
Assertion (A) is true because iron is denser than water, so it sinks in water and mercury is denser than iron, so iron floats in mercury.
Reason (R) is false because density of iron is not equal to mercury and is lower than mercury.
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Related Questions
Assertion (A) : A body when weighed by a spring balance, weighs slightly less in air than in vacuum.
Reason (R) : This is so because of upthrust of air on body.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
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Assertion (A) : A bucket filled with water is heavier till it is immersed in water in well.
Reason (R) : The effect of upthrust is that the weight of body immersed in liquid appears to be lighter than its actual weight.
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- both A and R are true and R is not the correct explanation of A
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Assertion (A) : A loaded ship is submerged more while an unloaded ship is less submerged.
Reason (R) : A loaded ship displaces more water in comparison to an unloaded ship in order to float.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
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Three solid objects A, B, and C have the same volume but different masses. They are released gently, one by one, into tanks containing three different liquids:
L1 (water), L2 (kerosene) and L3 (corrcentrated salt solution).The observations made are as follows:
- Object A floats in L1 and L3 but sinks in L2.
- Object B sinks in L1, floats fully submerged in L3, and sinks faster in L2.
- Object C floats in all three liquids but with different heights submerged.
Answer the following:
(a) Arrange the liquids in increasing order of density, giving reasons.
(b) Identify the condition of flotation of object B in liquid L3. What inference can be drawn about the densities of the object and liquid?
(c) "As object C floats in all three liquids, the upthrust acting on it is the same in all three cases." Is this statement correct? Explain.
(d) If object A is heated (without any change in mass) and then placed in L1, what change, if any, will occur in its floating level?
(e) Two similar ships made of the same material float in fresh water and sea water respectively. Which ship displaces more water and why?