Tag: chemistry

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Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Why iron is used widely in construction of buildings, bridges, railway lines etc?

  1. Iron is a good conductor of electricity

  2. Iron is ductile

  3. Iron have high tensile strength

  4. Iron is malleable
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Metals (except sodium, potassium) have very high tensile strength.
For example - iron can bear a lot of tensile strength. So, it is used in construction of buildings, bridges, railway lines etc.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The density of ice is $0.921\;g\ cm^{-3}$. Calculate the mass of a cubic block of ice which is $76\;mm$ on each side.

  1. $49 \:g$
  2. $4\times 10^2\;g$
  3. $0.04 \:g$
  4. $4\times 10^3\;g$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Now, 1 $mm $ =   0.1 $cm$

$ \therefore $ 76$mm $ =   7.6 $cm$
Volume of cube $ =  $ $ (7.6)^3$ $ =  $ 438. 98 $ cm^3$
Now, mass $ =  $ density $ \times $ volume $ =  $ 0.921 $ \times $ 438.98 $ =  $ 404 $g$ $ =  $ $ 4.04 \times10^2 :g$

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The mass of a piece of paper is $0.02\;g$ and the mass of a social substance and the piece of paper is $20.036\;g$. The volume of the solid substance is $2.16\;cm^3$. Calculate the density of the substance.

  1. $9.98$
  2. $7.36$
  3. $7.14$
  4. $9.268$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mass of piece of paper $=0.02\;g$


Mass of solid substance and piece of paper $=20.036\;g$

$\therefore$ Mass of solid substance $=20.036\;g-0.02\;g$

$\approx 20.02\;g$

Volume of solid $=2.16\;cm^3$

Density = $\dfrac{Mass}{Volume}=\dfrac{20.02}{2.16}=9.268 \ g/cm^3$

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The mass of steel sphere having density 7850$\;kg :m^{-3}$ and radius 0.15$\;m$ is:

  1. 112$\;kg$.
  2. 290$\;kg$.
  3. 110.9$\;kg$.
  4. 300$\;kg$.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mass  of the sphere, $M = Density \times Volume$


Volume of the sphere is, $ V= \dfrac {4}{3} \pi r^3$


$ V=  \dfrac {4}{3} \pi (0.15)^3= 0.01412  \ m^{3} $

$M= 7850 \times 0.01412$

$= 110.9 \:kg$

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Which of the following statement is correct?

  1. All metals are ductile.

  2. All non-metals are ductile.

  3. Generally, metals are ductile.

  4. Some non-metals are ductile.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Metals are generally malleable — that is, they can be hammered or pressed permanently out of shape without breaking or cracking — as well as fusible (able to be fused or melted) and ductile (able to be drawn out into a thin wire). 


Typically they are malleable and ductile, deforming under stress without cleaving. There are metals which are not ductile. 
For example sodium and mercury.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The high density of most of the metals is due to the_________.

  1. loosely packed crystal lattice of the metallic structure

  2. weak metallic bonding

  3. tightly packed crystal lattice of the metallic structure

  4. strong ionic bonding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The high density of most metals is due to the tightly packed crystal lattice of the metallic structure.