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Standard X

Physics

Density

A heavy body ...

Question

A heavy body has more mass per unit volume than a lighter body, i.e. it has lesser density.

True

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False

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Solution

The correct option is B False
The density of a substance can be defined as its mass per unit volume.
The more tightly packed the molecules are in a substance, the denser that substance is.
Depending upon the density, different substances with equal volumes may be classified as heavy or light.
A heavy substance has more mass per unit volume; that is it has a higher density than a lighter substance of equal volume.
Thus, the given statement is false.

Suggest Corrections

Similar questions

Select the correct alternative:

(a) The correct relation is

(i) Density = Mass $\times$ Volume

(ii) Mass = Density $\times$ Volume

(iii) Volume =Denstity $\times$ Mass

(iv) Density = Mass + Volume

(b) The relative density of alcohol is 0.8. Its density is

(i) 0.8 (ii) 800 kg $m^{-} 3$

(iii) 800 g $c m - 3$ (iv) 0.8 kg $m^{-} 3$

(i) 60.8 g (ii) 75 g

(iii) 48 g (iv) 0.013 g

(d) The density of aluminium is 2.7 g $c m^{-} 3$ and that of brass 8.4 g $c m^{-} 3$ . The correct statement is :

(i) Equal masses of aluminium and brass have equal volumes

(ii) The mass of a certain volume of brass is more than the mass of equal volume of aluminium

(iii) The volume of a certain mass of brass is more than the volume of equal mass of aluminium

(iv) Equal volumes of aluminium and brass have equal masses.

(e) A density bottle has a marking 25 mL on it. It means that :

(i) the mass of density bottle is 25g

(ii) the density bottle will store 25 mL of any liquid it

(iii) the density bottle store 25 mL.of water, but more volume of liquid denser than water.

(iv) the density bottle will store 25 mL of water but more volume of liquid lighter than water.

(f) The correct statement is :

(i) The buoyant force on a body is equal to the volume of the liquid displaced by it.

(ii) The buoyant force on a body is equal to the volume of the body

(iii) The buoyant force on a body is equal to the weight of the liquid displaced by it.

(iv) The buoyant force on a body is always equal to the weight of the body.

(g) A piece of wood floats on water. The buoyant force on wood will be :

(i) zero

(ii) more than the weight of the wood piece

(iii) equal to the weight of the wood piece.

(iv)less than 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 :

(i) sink

(ii) float with its some part outside the liquid

(iii) float just below the surface of liquid

(iv) float with whole of its volume above the surface of liquid.

A light and a heavy body have equal momenta. The lighter one has greater K.E.

Q. Two bodies

A

and

B

are having the same mass

M

. While the volume of body

A

is lesser than volume of body

B

. What is the relation between density of body

A

and body

B

.
(Take density of body

A = ρ_{A}

and density of body

B = ρ_{b}

& volume of body

A = V_{A}

and density of body

B = V_{B}

)

Gravitational force acts on all bodies in proportion to their masses. Why, then, doesn't a heavy body fall faster than a lighter body?

Q. Assertion :A light body and heavy body have same momentum. Then light body has more kinetic energy. Reason: Kinetic energy does not depend on mass of the body.

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