Tag: physics

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Questions Related to physics

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

State whether true or false:

Dew point is the temperature at which the gas at given atmospheric conditions becomes saturated.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid water at the same rate at which it evaporates so dew point is a temperature at which the air becomes saturated.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

A fan produces a feeling of comfort because :

  1. A fan supplies cool air

  2. Of the evaporation of sweat

  3. Fan increases the humidity in air

  4. Fan decreases the humidity in air
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fan produces a feeling of comfort because of evaporation of sweat. As evaporation releases heat energy, and evaporation of sweat. Results in feeling cool in those body parts.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

Define intermolecular force of attraction.

  1. The force of attraction between the electrons and protons of an atom is called the intermolecular force of attraction.

  2. The force of attraction between the molecules of matter is called the intermolecular force of attraction.

  3. The force of attraction between the elements in a molecule is called the intermolecular force of attraction.

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

The force of attraction between the molecules of matter is called the intermolecular force of attraction.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

At what temperature rms speed of air molecules is doubled of that at NTP?

  1. $819^oC$
  2. $719^oC$
  3. $909^oC$

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

$v _{rms}\propto \sqrt{T}$
$\Rightarrow \displaystyle\frac{v^2 _1}{v^2 _2}=\frac{T _1}{T _2}$
$\Rightarrow \displaystyle\frac{v^2}{4v^2}=\frac{273}{T _2}$
$\Rightarrow \displaystyle T _2=1092K$
$=819^oC$

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

He was a pioneer in the kinetic theory of gases. He contributed a lot to the fluid mechanics and the theory of vibrating strings. Who is this founder of mathematical physics?

  1. Sir Isaac Newton

  2. Daniel Bernouili

  3. James Clerk Maxwell

  4. Cound Rumford
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Daniel Bernoulli is well known for his work in fluid mechanics (Bernoulli's principle) and the kinetic theory of gases, as well as his mathematical analysis of vibrating strings.

Multiple choice types of cells electricity physics

Three types of electric cells which provide current are:

  1. Button cell, solar cell & secondary ceil

  2. Solar cell, electrolytic cell, electro chemical cell

  3. (A) and (B) both are correct

  4. Neither (A) nor (B) is correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

When a primary cell is used, chemical reactions in the battery use up the chemicals that generate the power; when they are gone, the battery stops producing electricity and is useless. In contrast, in a secondary cell, the reaction can be reversed by running a current into the cell with a battery charger to recharge it, regenerating the chemical reactants. 
The types of cells mentioned in option A and option are correct.
Hence, option C is correct.

Multiple choice types of cells electricity physics

Which one of the following solutions can be electrolysed ?

  1. Mercury

  2. Distilled water

  3. Solution of common salt

  4. Milk
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When dissolved in fluid, salts tend to break apart into their component ions, creating an electrically-conductive solution. Common salt is one such salt. common salt is  $ NaCl$ which gives $Na^+$ and $Cl^-$.

Multiple choice types of cells electricity physics

State whether true or false : 
There is no electrolyte in a dry cell.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonium chloride, as a paste, is the electrolyte in a dry cell. Hence the above statement is false.

Multiple choice types of cells electricity physics

Which one of the following primary cells has e.m.f. $1.08  V$ and which remains fairly constant ?

  1. Daniel cell

  2. Simple voltaic cell

  3. Leclanche cell

  4. Dry cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

the Daniel cell is a type of electrochemical cell invented in 1836. it is consisted of a copper pot filled with a copper sulfate solution , in which was immersed an unglazed earthenware container filled with sulfuric acid and a zinc electrode. Daniel cell is also called Zn-Cu cell and has constant e.m.f of 1.08 volts.