Multiple Choice Questions
Multiple Choice Questions
Q.1. A piece of wood is held underwater. The upthrust on it is:
(a) equal to the weight of the wood
(b) less than the weight of the wood
(c) more than the weight of the wood
(d) zero
Q.2. The relative density of a solid is 0.6. It floats in water with :
(a) whole of its volume inside water
(b) 60% volume inside water
(c) 60% volume outside water
(d) 40% volume inside water
Q.3. A balloon filled with hydrogen rises upwards because :
(a) hydrogen is an element
(b) the pressure inside the balloon is greater than the pressure outside
(c) hydrogen is a colourless gas
(d) the weight of the balloon is less than the weight of the air displaced by it
Q.4. An empty tin container with its mouth closed has an average density equal to that of liquid. The container is taken 2 m below the surface of the liquid and is left there. Then the :
(a) container will bounce back to the surface
(b) container remains where it is left
(c) container sinks further
(d) none of these
Q.5. The unit of relative density is :
(a) kg m-3
(b) g cm-3
(c) g litre-1
(d) it does not have a unit
Q.6. Two balls, one of iron and other of aluminium experience same upthrust when dipped in water.
(a) both have equal volume
(b) both have equal weight in air
(c) both have equal density
(d) nothing definite can be said
Q.7. A wooden cube of side 10 cm has a mass of 700 g. It floats in water with :
(a) half of its volume underwater
(b) 3 cm above the water
(c) 7 cm above the water surface
(d) just inside the water surface
Q.8. Archimedes’ principle states that when a body is totally or partially immersed in a fluid, the upthrust is equal to :
(a) the weight of the fluid displaced by it
(b) the weight of the body
(c) volume of the fluid displaced
(d) volume of the body
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