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Physics [1 Mark Question Answer]

Heat · ICSE STD 10 (ICSE - English Medium). 52 questions.

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[1 Mark Question Answer]

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Question 11 Mark
The amount of heat required to raise the temperature of a body by $1^0C$ is called .........
Answer
The amount of heat required to raise the temperature of a body by $1^0 \mathrm{C}$ is called  Heat capacity.
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Question 21 Mark
Why does a copper rod become warmer than an aluminium rod of the same mass, when put in the sun for the same length of time?
Answer
Copper road becomes warmer than an aluminium rod of the same mass because copper has lower heat capacity than aluminium.
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Question 31 Mark
Does the specific heat depend upon the temperature?
Answer
No, specific heat does not depend on temperature. It is constant for a substance. 
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Question 41 Mark
What do you mean by thermal capacity?
Answer
Thermal capacity of a body is the quantity of heat required to raise its temperature by $1^oC. $
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Question 61 Mark
State the factors on which heat gained or lost by a substance depends.
Answer
Heat gained or lost by a substance depends on the mass of the substance and the nature of the substance.
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Question 71 Mark
Name the substance that has the maximum value of specific heat.
Answer
Ammonia has the maximum value of specific heat.
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Question 81 Mark
How much is the specific heat of water in SI units?
Answer
Specific heat of water in SI units is $4200 J kg^{-1} K^{-1}. $
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Question 91 Mark
Does specific heat depend upon the mass of a substance?
Answer
No, specific heat does not depend on mass of a substance. It is constant for a substance. 
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Question 101 Mark
Write down the relation between specific heat and heat capacity.
Answer
Heat capacity = mass x specific heat capacity 
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Question 121 Mark
The specific heat of body is $0.2 cal g ^{-1}{ }^{\circ} C -1$. What is the meaning of this statement?
Answer
This means that $0.2$ cal $g^{-1} ^\circ C-1$ of heat is required to raise the temperature of 1g of the body by $1^\circ C. $
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Question 131 Mark
What is the unit of heat capacity in $CGS $system?
Answer
The unit of heat capacity in $CGS$ system is calorie$/^oC.$
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Question 141 Mark
What is the latent heat of vaporization of steam?
Answer
The latent heat of vaporization of steam is the amount of heat energy required to change water at $100^oC$ to steam at the same temperature.
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Question 151 Mark
What is the latent heat of fusion of ice?
Answer
The latent heat of fusion of ice is the amount of heat energy required to change ice at $0^oC$ into water at the same temperature. 
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Question 161 Mark
What is the effect of pressure on the boiling point of water?
Answer
The boiling point of a liquid increases with the increase in pressure and decreases with the decrease in pressure. 
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Question 171 Mark
What do you understand by the latent heat of vaporization?
Answer
The amount of heat required to change a liquid at its boiling point to vapour at the same temperature is called its latent heat of vaporization.
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Question 181 Mark
Define specific heat. Is it same as heat capacity?
Answer
Specific heat is the amount of heat required to raise the temperature of $1$ kg of the substance through $1^oC.$
It is not same as heat capacity.
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Question 191 Mark
What do you mean by regelation?
Answer
Regelation is the phenomenon of melting under pressure and freezing again when the pressure is reduced. 
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Question 201 Mark
What is the effect of pressure on the melting point of ice?
Answer
The melting point of substances which contract on melting (like ice) decreases by the increase in pressure. 
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Question 211 Mark
What is the effect of impurities on the melting point of ice?
Answer
The melting point of ice decreases on addition of impurities in it. 
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Question 221 Mark
What do you mean by the statement?
'The specific latent heat capacity of fusion of ice is 336 J per g'?
Answer
It means that 1 g of ice at $0^{\circ} C$ absorbs 336 J of heat energy to convert into water at $0^{\circ} C$.
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Question 261 Mark
State whether heat energy is absorbed or released during freezing of ice.
Answer
Heat energy is released during freezing of ice. 
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Question 271 Mark
State whether heat energy is absorbed or released during melting of ice.
Answer
Heat energy is absorbed during melting of ice. 
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Question 281 Mark
A substance is heated at a constant rate from a low temperature to a high temperature. A graph of temperature against time is shown in the figure. Which part or parts of the graph correspond(s) to the substance existing in two states?
Answer
Parts AB and CD correspond to the substance existing in two states.
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Question 311 Mark
Define $1$ joule.
Answer
$1$ joule is the amount of heat required to raise the temperature of $1 \ kg$ of a substance, that has specific heat capacity 1J/kgK, through $1^oC. $
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Question 341 Mark
What do you mean by thermal energy?
Answer
Thermal energy is energy that is powered by a heat source. For e.g.: an electric heater generates thermal energy that can be used to warm a cold room in the winter. 
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Question 351 Mark
Write down a relationship to convert temperature on the Fahrenheit to Celsius scale.
Answer
$C=\frac{5}{9}(F-32)$
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Question 361 Mark
What is the normal body temperature of a healthy person on the Celsius scale?
Answer
The normal body temperature of a healthy person is 37°C. 
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Question 371 Mark
What is the other name of Doctor's thermometer?
Answer
Doctor's thermometer is also called Clinical thermometer.
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Question 381 Mark
What kind of thermometer is commonly used?
Answer
'Liquid-in-glass' kind of thermometer is commonly used. 
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Question 391 Mark
Why do the molecules of a gas move about freely?
Answer
Gas molecules have very weak or no bonds at all and the spaces between gas molecules are very large. So, the molecules of a gas move about freely.
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Question 401 Mark
A substance is heated gradually. Does its energy increase or decrease?
Answer
Its energy increases on heating. 
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Question 411 Mark
Name the physical quantity that measures the degree of hotness.
Answer
Temperature is the physical quantity that measures the degree of hotness.
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Question 421 Mark
The sp . Heat capacity of water is $4200 J kg ^{-1} K^{-1}$. What information does this convey?
Answer
This means that $4200 J$ of heat is required to raise the temperature of $1kg$ of water by $1K. $
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Question 431 Mark
Write the approximate value of specific heat capacity of water in SI unit.
Answer
Specific heat capacity of water is $4200 Jkg^{-1}K^{-1}.$
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Question 451 Mark
What is absolute zero?
Answer
Absolute zero is the temperature at which volume or pressure of an ideal gas becomes nil. It is $0$ degrees on the Kelvin scale, which translates to $-273^oC (or -459.4^oF).$
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Question 461 Mark
Water is used as an effective coolant. Give reason.
Answer
Water is used as an effective coolant since it has a high value of specific heat capacity $(4200 J kg^{-1}K^{-1}). $
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Question 471 Mark
Define the term 'specific heat capacity' and state its unit.
Answer
Specific heat capacity is the amount of heat required to raise the temperature of $1 \ kg$ of the substance by $1^oC.$
Units: j/kgK or calorie/g$ ^oC$
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Question 481 Mark
Write down the approximate temperature at which the water boils in a pressure cooker.
Answer
Pressure cooker increases the pressure and hence the boiling point increases. So, the boiling point becomes greater than 100°C.
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Question 491 Mark
Which contains more heat: 1 G water at 100°C or 1 g steam at 100°C? Give reason.
Answer
1 gram of water at 100°C requires 540 calories of heat to get converted into 1 gram of steam at 100°C. So, steam has more heat.
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Question 501 Mark
Which has more heat: 1 g of ice at 0°C or 1 g of water at 0°C? Give reason.
Answer
1 gram of ice at 0°C requires 80 calories of heat to get converted into 1 gram of water at 0°C. So, water has more heat.
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[1 Mark Question Answer] - Physics STD 10 Questions - Vidyadip