Physics
Assertion (A): A reading of 32 °F on a thermometer equals 0 °C.
Reason (R): The Celsius scale is commonly used in most countries for measuring temperature.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Heat Energy
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Answer
Both A and R are true and R is not the correct explanation of A
Explanation
Assertion (A) is true because a temperature of 32 °F is equal to 0 °C, which is the freezing/melting point of water on both scales.
Reason (R) is true because the Celsius scale is widely used in most countries for measuring temperature.
Both Assertion and Reason are correct, but the Reason does not explain the Assertion, since it does not relate to the conversion between temperature scales.
Therefore, both A and R are true and R is not the correct explanation of A.
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Related Questions
In the process of convection, heat travels:
- sideways
- downwards
- upwards
- in all directions
The vacuum kept in between the walls of a thermos flask reduces the heat transfer by:
- conduction only
- convection only
- radiation only
- conduction and convection
Assertion (A): The bottoms of cooking utensils should be kept smooth and shiny.
Reason (R): Smooth and shiny surfaces are good reflectors of heat.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Fill in the blanks:
(a) Heat is a form of …………… .
(b) …………… determines the degree of hotness or coldness of a body.
(c) On heating a body, its temperature …………… .
(d) We use a …………… for measuring the temperature of a body.
(e) The S.I. unit of temperature is …………… .
(f) In a thermometer, the commonly used liquid is …………… .
(g) The temperature of a normal human body is …………… °C.
(h) A person is said to have fever if his body temperature is more than …………… °F.
(i) A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from …………… to …………… .
(j) The temperature of boiling water is …………… .
(k) Liquids expand …………… than solids.
(l) Gases expand …………… than liquids.
(m) Heat transfer in solids is by …………… .
(n) Heat transfer in liquids and gases is by …………… .
(o) Metals are …………… of heat.
(p) Still air is an …………… of heat.
(q) Black and dull surfaces are …………… of heat.