Density and Its Units

Q. Density of solids are always greater than liquids and gases.

1. True
2. False

Q. What happens to the density of a fluid on increasing its temperature?

1. Density decreases
2. Density increases
3. Density remains the same.
4. Density first increases then decreases.

Q.

Density is the amount of matter present in unit volume of a substance.

1. True
2. False

Q.

You are given a block of iron and wood each, both having the same volume. How can you verify which has more density, iron or wood?

Q.

In order to find the density of a substance which of the following quantities should be known

1. Volume

2. Mass

3. Both mass and volume

4. Either mass and volume

Q.

What is the SI unit of density of a substance?

Q.

The diameter of a metallic ball is $4.2cm$. What is the mass of the ball, if the density of the metal is $8.9gperc{m}^2$ ? (Assume $\mathrm{\pi }=\frac{22}{7}$)

Q. The density of copper is $3gc{m}^{-3}$. Express it in $kg{m}^{-3}$.

1. $3$
2. $300$
3. $30$
4. $3000$

Q. Two solid spheres have equal mass and have radius in the ratio of 1 : 3. The ratio of their densities is

1. 
   9 : 1
2. 
   1 : 9
3. 
   1 : 27
4. 
   27 : 1

Q. What do you mean by density? Mention its SI unit.

Q. Determine the volume of a water droplet assuming it to be spherical with a diameter of 2 mm ?

1. $4.19$ x ${10}^{-6}{m}^3$
2. $2.09$ x ${10}^{-6}{m}^3$
3. $4.19$ x ${10}^{-9}{m}^3$
4. $2.09$ x ${10}^{-9}{m}^3$

Q. Which of the following is the S.I. unit of density?

1. $kg$
2. $m$
3. $kg/m^3$
4. $l$

Q. Milk has a density of $1.03g/ml$ at ${25}^{\circ }C$ and 1 atm pressure. Calculate the mass of $1l$ of milk.

1. 0.030 g
2. 1.030 g
3. 0.030 kg
4. 1.030 kg

Q. A body of mass 'm' expands and its volume increases to two times its original volume. Density of the body ________.

1. remains constant
2. is reduced by half
3. becomes twice
4. is reduced to quarter

Q.

An object having dimensions 1 m by 2 m by 3 m and 2 kg mass. What is its density in $\frac{kg}{m^3}$? Would it float in water?

Density of water($d_{water}$ = 1000 $\frac{kg}{m^3}$)

1. 3, YES

2. 3 x 10^-3, NO

3. 0.33, YES

4. 0.33 x 10^-3, NO

Q.

An object of mass 100 g has a volume of $20c{m}^3$. Calculate the density of the object. If the density of water is $1g/c{m}^3$. State whether the object will float or sink in water.

1. $5.0g/c{m}^3,sink$

2. $2.0g/c{m}^3,float$

3. $5g/c{m}^3,float$

4. $1.0g/c{m}^3,sink$

Q. The external dimensions of a wooden box are 18 cm, 10 cm and 6 cm respectively and thickness of the wood is 5 mm. If the empty box weighs 3.15 kg, then the weight of $1c{m}^3$ of wood is ________.

1. 7 grams

2. 15 grams

3. 10 grams

4. 1 grams

Q. A piece of wood is 3 m long, 2 m wide, and has a thickness of 1 m. Find the density, if its mass is 2 kg.

1. $0.33kg/m^3$

2. $0.33kg/c{m}^3$

3. $3kg/m^3$

4. $3kg/c{m}^3$

Q. Density cannot be defined for irregular objects.

1. True
2. False

Q. The amount of matter in the unit volume of the substance is its:

1. Density
2. Relative Density
3. Mass
4. Volume

Q.

The density of a liquid is supposed to be ________ than the density of gases.

Q. Two spheres made of same substance have diameter in ratio 1:2 . Their thermal capacities are in ratio of

Q.

is density depend on the temperature?why?when object float in liquid(water)its densty should be less or greater than liquid?

Q. Which of the following is/are the unit(s) of density?

1. $g{m}^{-2}$
2. $gc{m}^{-3}$
3. $kg{m}^{-3}$
4. $kgc{m}^{-2}$

Q. The density of a substance is given by:

1. Mass + Volume
2. Mass x Volume
3. Mass-Volume
4. Mass / Volume

Q.

A body of mass 'm' expands and its volume increases to two times its original volume. The density of the body .

1. is reduced by half
2. remains constant
3. becomes twice