Tag: measurement and effects of heat

Quizzes (6) Questions (86)

Questions Related to measurement and effects of heat

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

The quantity/ quantities that does/do not have mass in its/their dimensions is/are

  1. Specific heat

  2. Latent heat

  3. Electrical potential difference

  4. Electrical resistance
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

Specific heat- $J/kg^oC$
Latent Heat- J/kg
Electrical potential difference- J/coulumb
Electrical resistance- ohm
 Hence, option C and D are correct

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

When 60 calories of heat are supplied to 15 g of water, the rise in temperature is

  1. <font><font>$75^{\circ}C$</font></font>

  2. <font><font>$90^{\circ}C$</font></font>

  3. <font><font>$4^{\circ}C $</font></font>

  4. <font><font>$0.25^{\circ}C$</font></font>
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$Heat = m S \Delta T$
$\Rightarrow 60=15\times 1\times\triangle T \ \Rightarrow \triangle T=4^oC$

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

Calorimeters are generally made of

  1. copper

  2. brass

  3. aluminium

  4. zinc
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Calorimeters is made of copper because:
1) Copper has low specific heat capacity and thus it reaches equilibrium temperature quickly by absorbing small amount of heat.

2) Cu is highly malleable and hence very thin box of small mass can be made, thus decreasing heat capacity of box.

3) Cu is good conductor of heat.
Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

On which law does the study of calorimetry based?

  1. Joule's law

  2. Law of conservation of energy

  3. Law of Kinetic energy

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

Principle of calorimetry states that heat lost by a hotter body = heat gained by a colder body, therefore in calorimetry, total heat energy of the system remains constant, which is the law of conservation of energy . 

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

When 60 calories of heat are supplied to 15 g of water, the rise in temperature is

  1. $75^\circ C$

  2. $900^\circ C$

  3. $4^\circ C$

  4. $0.25^\circ C$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We know that, $heat=mass\times specific \;heat\times change\;in\;temperature \ \Rightarrow 60=15\times 1\times \triangle T \ \Rightarrow \triangle T=4^oC$

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

A thermos bottle containing coffee is vigorously shaken. If the coffee is considered as a system, then the temperature of the coffee will 

  1. increase slightly

  2. fall

  3. remain the same

  4. never be determined
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A thermoflask is closed system, so no heat energy added to system i.e. $\triangle \theta=0$
Work is done on the system by shaking it against viscous force. Hence $\triangle w=-ve$
Internal energy, $\triangle U=\triangle \theta - \triangle w=0-(-\triangle w) \\ \Rightarrow \triangle U=+\triangle w$
$\because \triangle U\; is\; +ve$ So there is increase in temperature due to rise in internal enrgy.
Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

The branch of physics that deals with the measurement of heat energy is known as

  1. Fermentation

  2. Latent heat

  3. Calorimetry

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

Calorimetry is the branch of physics which deals with the measurement of heat energy. Calorimetry is one of the methods for the determination of specific heats or latent heats of the substances.

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

Heat is added to a block of ice of mass $m$ until the entire block melts into liquid water. Identify by which of the following method this can be explained ?

  1. First law of thermodynamics (conservation of energy)

  2. Second law of thermodynamics (law of entropy)

  3. Ideal gas law

  4. Heat of fusion and heat of vaporization equation

  5. Heat engine efficiency
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When heat is added to ice at $0^{\circ}C$, the temperature of the ice does not change. However the heat goes into the latent heat of fusion of ice, This is a kind of potential energy that water owns in form of latent heat.

Hence correct answer is option D.