Tag: introduction to heat

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Multiple choice physics measurement and effects of heat sources of heat introduction to heat measuring temperature

The quantity of heat energy required to change the temperature of one gram of water by one degree Celsius is known as

  1. 1 joule

  2. 1 kilocalorie

  3. 1 calorie

  4. 1 ampere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The amount of heat required to raise the temperature of one gram of water  through $ 1 ^{o}$ (from $14.5^{o}C$ to $15.5^{o}C$), is called one calorie.

Multiple choice physics measurement and effects of heat sources of heat introduction to heat measuring temperature

One calorie is defined as

  1. The amount of heat energy required to raise the temperature of $1\ g$ water by $1^o\ C$

  2. The amount of heat energy required to raise the temperature of $1\ kg$ water by $1^o\ C$ 

  3. The amount of heat energy required to raise the temperature of $1\ g$ water by $1^o\ F$ 

  4. The amount of power required to raise the temperature of $1\ g$ water by $1^o\ C$ 
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The amount of heat energy required to raise the temperature of 1 g water by $1^o\ C$ is called one calorie.

Multiple choice physics measurement and effects of heat sources of heat introduction to heat measuring temperature

The temperature range in the definition of calorie is

  1. $14.5^{o}C $<span>&nbsp;</span>to $15.5^{o}C $

  2. $15.5^{o}C $ to $16.5^{o}C $

  3. $1^{o}C $ to $2^{o}C $

  4. $13.5^{o}C $ to $14.5^{o}C $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the International Committee of Pure Physics, calorie is the standard unit to measure heat. The quantity of heat required to raise 1 gram of water from $14.5^o C \ to \ 15.5^o C$ is defined as a calorie.

Multiple choice physics measurement and effects of heat sources of heat introduction to heat measuring temperature

Out of the metal balls of same diameter one is solid and other is hollow. Both are heated to the same temperature at $300^{0}C$ and then allowed to cool in the same surroundings then rate of loss of heat will be:

  1. More for hollow sphere

  2. More for solid sphere

  3. Same for both

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rate of loss of heat depends on the surface area and the emissivity. For a hollow sphere and a solid sphere of the same diameter, the surface area is identical. However, the hollow sphere has less mass, meaning it has a lower heat capacity and will cool faster.