7th Grade > Physics
HEAT MCQs
Total Questions : 118
| Page 12 of 12 pages
Answer: Option A. ->
Both occur at the same temperature.
:
A
:
A
Melting point is the temperature at which a given solid will melt. Freezing point is the temperature at which a liquid turns into a solid when cooled.
Melting and freezing are reverse phenomenon and occur at same temperature. For water, it is 0 °C
Answer: Option C. ->
Temperature of A = Temperature of B
:
C
We know, heat always transfers from a body at high temperature to a body at low temperature. Therefore, if two bodies are in contact and they have the same temperature, then there is no net heat transfer between them.
:
C
We know, heat always transfers from a body at high temperature to a body at low temperature. Therefore, if two bodies are in contact and they have the same temperature, then there is no net heat transfer between them.
Question 113.
While doing an experiment to measure the temperature at which water boils, Ram keeps the laboratory thermometer completely immersed in water without touching the surface or bottom of the beaker. On the other hand does Shyam does the same experiment with the thermometer touching the bottom of the beaker. Who is more likely to get an accurate reading?
Answer: Option A. ->
Ram
:
A
:
A
Ram will get the accurate result. This is because, when the thermometer touches the base of the container, it results in the transfer of heat directly from the beaker to the thermometer. Thus Shyam would not get the temperature of water accurately.
Answer: Option B. ->
37∘C
:
B
:
B
A healthy person on an average has a body temperature of 37∘C which is equal to 98.6∘F.
Answer: Option A. ->
True
:
A
Clinical thermometers can measure temperatures from 35 °C to 42 °C whereas the range of laboratory thermometers is −10 °C to 110 °C. So it is true that it can measure higher temperatures.
:
A
Clinical thermometers can measure temperatures from 35 °C to 42 °C whereas the range of laboratory thermometers is −10 °C to 110 °C. So it is true that it can measure higher temperatures.
Answer: Option A. ->
Sea breeze
:
A
During the day time, land gets heated faster than water, as water has more specific heat capacity. The air above land becomes hotter than the air above sea and it rises up. So, the winds blow from sea to land to fill the void left by the hot air, which are called sea-breeze.
:
A
During the day time, land gets heated faster than water, as water has more specific heat capacity. The air above land becomes hotter than the air above sea and it rises up. So, the winds blow from sea to land to fill the void left by the hot air, which are called sea-breeze.
Answer: Option A. ->
True
:
A
:
A
As we increase the temperature, the random motion of the particles of a body increases because their kinetic energy increases. So, they are more active than molecules in a cold body.
Answer: Option B. ->
Convection
:
B
Convection is the dominant process of heat transfer in fluids (such as water). When heated, the molecules in the fluid move from region of higher density to that of lower density. When heated from below, hot water from the bottom move to the top and simultaneously, cold water from the top moves to the bottom.
:
B
Convection is the dominant process of heat transfer in fluids (such as water). When heated, the molecules in the fluid move from region of higher density to that of lower density. When heated from below, hot water from the bottom move to the top and simultaneously, cold water from the top moves to the bottom.
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