Tag: measurement of properties

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Questions Related to measurement of properties

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

Which of the following relationships are wrong?

  1. $1 \,atm\approx 0.1 \, bar$
  2. $1 \,liter= 1 \, dm^3$
  3. $1\, J =0.239 \, cal$
  4. $1\, eV =9.11 \times 10^{-4} J$
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

$1\quad atm=1.01325\quad bar\approx 1\quad bar\neq 0.1\quad bar$

$1\quad litre={ 10 }^{ -3 }{ m }^{ 3 }=1{ dm }^{ 3 }$
$1\quad cal =4.18\quad J \Rightarrow 1\quad J =0.239\quad cal\ 1\quad ev=1.6\times { 10 }^{ -19 }J \neq  9.11\times { 10 }^{ -4 }J$
Therefore, $(A). (D)$ are the correct answer.

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

Units of physical quantities can be expressed in terms of fundamental units and such units are called:

  1. Fundamental units

  2. Derived units

  3. Both a and b

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Units of physical quantities can be expressed in terms of fundamental units and such units are called $\text{derived units}$. 

Unit of area can be an example for derived unit. If $L$ is the length of the square then $L \times L$ is $L^{2}$ is its area. Hence, option A is correct.

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

The units of fundamental physical quantities are called

  1. Fundamental units

  2. Derived units

  3. Both a and b

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The units of fundamental physical quantities are called fundamental units. They are length, mass and time.
Hence option A is correct.

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

Match the following combinations of electrical units with their terms as single unit:

Electrical unit Single unit
(I) ampere-second A. coulomb
(II) volt-ampere B. ohm
(III) volt-ampere$^{-1}$ C. ampere
(IV) walt/ampere ohm D. watt
(V) joule / ampere second E. volt

  1. A- I B-III C-IV D-II E-V

  2. A- I B-II C-III D-IV E-V

  3. A- V B-IV C-III D-II E-I

  4. A- I B-V C-IV D-II E-III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrical unit     Single unit

(I) ampere-second                   coulomb

(II) volt-ampere                         Ampere

(III) volt-ampere$^{-1}$         Volt

(IV) walt/ampere ohm              Ohm

(V) joule / ampere second       Volt

So correct options are A- I B-III C-IV D-II E-V

Hence option A is correct.

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

Which of the following is the non- derived unit?

  1. Time

  2. Mass

  3. Length

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Non-derived units or fundamental units are the units which are used to derive other units. The fundamental units are length, mass, temperature, time, electric current, liminous & mole.

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

Which of the following is not a basic physical quantity?

  1. Length

  2. Time

  3. Density

  4. Amount of substance
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Basic physical quantities are those that are physical fundamental units. There are seven basic fundamental quantities: Length, mass, time, electric current, amount of substance, luminous intensity & temperature. The quantities which are derived with the help of these basic physical quantities are called derived quantities. They are density, volume, pressure, force, etc.

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

What should be the volume of the milk (in $m^3$) which measures 5 L?

  1. $5 \times 10^{-3} m^{3}$
  2. $5 \times 10^{3} m^{3}$
  3. $5 \times 1000 \ m^{3}$
  4. $5 \times 10^{6} m^{3}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
$1\ L=10^{-3}\ m^{3}$
Since 1 L = 1000 $cm^3$ and 1 m = 100 cm
$\dfrac {1 m}{100 cm} = 1 = \dfrac{100 cm}{1 m}, or (\dfrac {1 m}{100 cm})^3 = \dfrac{1m^3}{10^6cm^3}$ = $1^3$ = 1

Therefore $5\ L=5 \times 10^{-3}\ m^{3}$
option A is correct