Density

Q.

Density of liquid in CGS system is $0.625{\mathrm{gcm}}^{-3}$. What is its magnitude in SI system?

1. $0.625$

2. $0.0625$

3. $0.00625$

4. $625$

Q. In anomalous expansion of water, at what temperature the density water is maximum?

1. $<9^{\circ }\text{C}$
2. ${10}^{\circ }\text{C}$
3. $>4^{\circ }\text{C}$
4. $4^{\circ }\text{C}$

Q. At the same depth, atmospheric pressure is .............. water pressure.

1. greater than
2. lesser than
3. equal to
4. none of these

Q. Three liquids of densities $d,2d$ and $3d$ are mixed in equal volumes. Then the density of the mixture is

1. $d$
2. $2d$
3. $3d$
4. $5d$

Q. Three liquids of densities $d,2d$ and $3d$ are mixed in equal proportions of weights. What is the relative density of the mixture, if $d$ is the density of water?

1. $\frac{11}{7}$
2. $\frac{18}{11}$
3. $\frac{13}{9}$
4. $\frac{23}{18}$

Q. Provided ρ_iron>ρ_cotton , what is heavier on the surface of Earth: 1 m³ cotton or 1 m³ of Iron? :.

1. cotton
2. iron
3. both iron and cotton

Q.

Engineers and architects should have knowledge of the densities of various building materials. Why?

Q. Equal masses of two liquids having densities $d_1$ and $d_2$ are mixed together. The density of the resulting mixture is

1. $\frac{d_1+d_2}{2}$
2. $\frac{d_1-d_2}{d_1{d}_2}$
3. $\frac{d_1{d}_2}{d_1+d_2}$
4. $\frac{2d_1{d}_2}{d_1+d_2}$

Q. When fluids of density $2.2\text{g/cc}\&4.8\text{g/cc}$ are mixed together in equal volumes, then the density of the resulting mixture will be

1. $1.2\text{g/cc}$
2. $2.6\text{g/cc}$
3. $3.5\text{g/cc}$
4. $4.2\text{g/cc}$

Q. At the same depth, atmospheric pressure is .............. water pressure.

1. greater than
2. lesser than
3. equal to
4. none of these

Q. Liquids of densities d1 and d2 mixed in equal volume results in density of 4.

1. If mixed in equal masses the density is 3. Then d1 = 6 and d2 = 2
2. If mixed in equal masses the density is 3. Then d1 = 3 and d2=5
3. If mixed in equal masses the density is 3. Then d1 = 12 and d2=4
4. None of these

Q.

Find the weight of the air at 20⁰C contained in a room with $4.0m\times 5.0m$ floor and a ceiling 3.0 m high. (Density of air at 20⁰C is 1.20 kg/m³).

1. 72 kg

2. 30 kg

3. 95 kg

4. 15 kg

Q.

In making an alloy, a substance of specific gravity $s_1$ and mass $m_1$ is mixed with another substance of specific gravity $s_2$ and mass $m_2$; then the specific gravity of the alloy is

1. $⟮\frac{m_1+m_2}{s_1+s_2}⟯$

2. $⟮\frac{s_1{s}_2}{m_1+m_2}⟯$

3. $\frac{m_1+m_2}{⟮\frac{m_1}{s_1}+\frac{m_2}{s_2}⟯}$

4. $\frac{⟮\frac{m_1}{s_1}+\frac{m_2}{s_2}⟯}{m_1+m_2}$

Q. When fluids of density $2.2\text{g/cc}\&4.8\text{g/cc}$ are mixed together in equal volumes, then the density of the resulting mixture will be

1. $1.2\text{g/cc}$
2. $2.6\text{g/cc}$
3. $3.5\text{g/cc}$
4. $4.2\text{g/cc}$

Q.

If a sample of metal weighs 210 gm in air, 180 gm in water and 120 gm in a liquid:

1. Relative density of metal is 3

2. Relative density of metal is 7

3. Relative density of liquid is 10

4. Relative density of liquid is $\frac{1}{3}$

Q. Select the correct statement from the statements given below:
$\left(i\right)$ An object sinks in water when its specific gravity $<1$
$\left(ii\right)$ An object floats in water when its specific gravity $>1$

1. $\left(i\right)$ only
2. $\left(ii\right)$ only
3. Both$\left(i\right)\&\left(ii\right)$
4. None of the above