Tag: matter around us

Questions Related to matter around us

Which of the following has the highest numeric value?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $100$ Tm

  2. $1000$ Gm

  3. $10^4$ mm

  4. $10^6$ nm

Show answer
Correct Option: A
Explanation:

$100\ Tm=100000\ Gm$

$1000\ Gm$
$10^4\ mm=1\times10^{-10}\ Gm$
$10^6\ nm=1\times10^{-12}\ Gm$

Which of the following is the correct value of $R$ in $SI$ units?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $0.083$ $bar$ $dm^{3}K^{-1}mol^{-1}$

  2. $1.98\ cal K^{-1}mol^{-1}$

  3. $8.314\times 10^{7} erg K^{-1}mol^{-1}$

  4. $8.314 J\ K^{-1}mol^{-1}$

Show answer
Correct Option: D
Explanation:

$R$ is called as universal gas constant or molar gas constant.

              $R=0.0821\quad L\quad atm\quad { mol }^{ -1 }{ k }^{ -1 }\ R=0.0831\quad { dm }^{ 3 }bar\quad { mol }^{ -1 }{ k }^{ -1 }\ R=8.314\quad J\quad { mol }^{ -1 }{ k }^{ -1 }\ R=8.314\times { 10 }^{ 7 }erg\quad { mol }^{ -1 }{ k }^{ -1 }\ R=1.98\quad Cal\quad { mol }^{ -1 }{ k }^{ -1 }$
The $S.I$ units of molar gas constant $(R)$ is $J\quad { mol }^{ -1 }{ k }^{ -1 }$.
$\therefore \quad R=8.314\quad J\quad { mol }^{ -1 }{ k }^{ -1 }$ is the correct answer.

The prefix zepto stands for:

[Note : unit in m]

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $10^9$

  2. $10^{-12}$

  3. $10^{-15}$

  4. $10^ {-21}$

Show answer
Correct Option: D
Explanation:

Zepto = $10^{-21}m$ .

$1^{\circ}C$ rise in temperature is equal to rise of:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. ${ 1 }^{ 0 }F$

  2. ${ 9/5 }^{ 0 }F$

  3. ${ 5/9 }^{ 0 }F$

  4. ${ 33 }^{ 0 }F$

Show answer
Correct Option: B
Explanation:

Solution:- (B) $\cfrac{9}{5} ℉$

As we now that,
$F  = \cfrac{9}{5} C + 32$
As the temperature is risen by $1 ℃$-
$C' = C + 1$
Therefore,
$F' = \cfrac{9}{5} \left( C + 1 \right) + 32$
$F' = \cfrac{9}{5}C + \cfrac{9}{5} + 32$
$\Rightarrow F' = \left( \cfrac{9}{5}C + 32 \right) + \cfrac{9}{5}$
$\Rightarrow F' = F + \cfrac{9}{5}$
Hence $1 ℃$ rise in temperature is equal to the rise in $\cfrac{9}{5} ℉$.

The prefix femto stands for :

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $10^9$

  2. $10^{-12}$

  3. $10^{-15}$

  4. $10^5$

Show answer
Correct Option: C

$1^oC$ rise in temperature is equal to a rise of 

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $1^oF$

  2. $9/5^oF$

  3. $5/9^oF$

  4. $33^oF$

Show answer
Correct Option: B

$mol.kg^{-1}$ is the unit of :

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. Momentum

  2. Velocity

  3. Pressure

  4. Molality

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Correct Option: D

If the temperature of a water bath is $104^{0}\ F$ then its value in degree Celsius scale will be?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $35^{0}C$

  2. $45^{0}C$

  3. $50^{0}C$

  4. $40^{0}C$

Show answer
Correct Option: D
Explanation:

Conversion from Fahrenheit to Celsius



$(T\ °F − 32) \times \dfrac{5}{9} = t\ °C$

Substituting it, we get,

$(104\ °F − 32) \times \dfrac{5}{9} = 40\ °C$


Hence, the correct option is $D$

Thermometer $(A) & (B)$ have ice points marked at $15^oC & 25^oC$ and steam points at $75^oC & 125^oC$ respectively. When thermometer A measures the temperrature of a bath as $60^oC$ the reading of B for the same bath is :-

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $60^oC$

  2. $75^oC$

  3. $90^oC$

  4. $100^oC$

Show answer
Correct Option: B

Weight of a body is:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. constant

  2. not constant

  3. does not change from place to place

  4. both A and C

Show answer
Correct Option: B
Explanation:

Mass of a body is constant whereas weight of a body depends on the acceleration due to gravity at that point. Therefore, weight of body is not constant & varies from place to place.