7th Grade > Physics
HEAT MCQs
Total Questions : 118
| Page 6 of 12 pages
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The temperature of the human bodydoes not generally go below 35∘C or above 42∘C.
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Effects: 1 Mark each
The effects of heat energy are the following:
(i)When heat is supplied to a body, its temperature rises.
(ii) When heat is supplied to a body it expands, i.e. its dimensions are changed. Material bodies expand on heating and contract on cooling.
Answer: Option B. -> 37∘C
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B
A healthy person on an average has a body temperature of 37∘Cwhich is equal to 98.6∘F.
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B
A healthy person on an average has a body temperature of 37∘Cwhich is equal to 98.6∘F.
Answer: Option C. -> either mercury based or digital
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C
Clinical thermometers aresmall medical thermometers used formeasuringa person's temperature. Mercury-based clinical thermometers have been considered the most accurate liquid-filled thermometertype. However, Mercury is a poisonousmetal. Therefore asafer and an accurate alternative option, is to use digital clinical thermometers. Thus, both mercury and digital clinical thermometers are used.
:
C
Clinical thermometers aresmall medical thermometers used formeasuringa person's temperature. Mercury-based clinical thermometers have been considered the most accurate liquid-filled thermometertype. However, Mercury is a poisonousmetal. Therefore asafer and an accurate alternative option, is to use digital clinical thermometers. Thus, both mercury and digital clinical thermometers are used.
Answer: Option A. -> True
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A
A body is defined as hot or cold with respect to some reference. Hotness of a body is generallystated with reference to another body or the surrounding.
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A
A body is defined as hot or cold with respect to some reference. Hotness of a body is generallystated with reference to another body or the surrounding.
Question 56. 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
Ram will get theaccurate result. This is because, when the thermometer touchesthe base of the container, itresults in the transfer of heat directly from the beakerto the thermometer. Thus Shyamwould not get the temperature of water accurately.
:
A
Ram will get theaccurate result. This is because, when the thermometer touchesthe base of the container, itresults in the transfer of heat directly from the beakerto the thermometer. Thus Shyamwould not get the temperature of water accurately.
Answer: Option A. -> Both occur at the same temperature.
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A
Melting point is the temperature at which a given solid will melt. Freezing point isthe 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 is0°C
:
A
Melting point is the temperature at which a given solid will melt. Freezing point isthe 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 is0°C
Answer: Option B. -> Convection
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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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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.
Answer: Option A. ->
Clinical thermometer
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A
A clinical thermometer is used to measure body temperature. It indicates temperatures from a minimum of 35∘C or 95∘F to a maximum of 42∘C or 108∘F.
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A
A clinical thermometer is used to measure body temperature. It indicates temperatures from a minimum of 35∘C or 95∘F to a maximum of 42∘C or 108∘F.
Answer: Option A. ->
Heat flows from a hot body to a cold body.
:
A
Heat flows from a hot body to a cold body. When two bodies, one hot and another cold, come in contact with each other, the fast moving molecules of the hot body collide with the slow moving molecules of the cold body and the molecules of cold body becomes faster. As a result, the molecules of hot body become slower and the body becomes cooler, whereas the cold body becomes warmer. This continues till both the bodies reach a common temperature, i.e thermal equilibruim is attained.
:
A
Heat flows from a hot body to a cold body. When two bodies, one hot and another cold, come in contact with each other, the fast moving molecules of the hot body collide with the slow moving molecules of the cold body and the molecules of cold body becomes faster. As a result, the molecules of hot body become slower and the body becomes cooler, whereas the cold body becomes warmer. This continues till both the bodies reach a common temperature, i.e thermal equilibruim is attained.
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