Heat & Thermodynamics

The hand burns more by steam comparatively to boiling water, because –

Which of the following is a correct relationship between Fahrenheit (°F) and Celsius (°C) degrees?

At what temperature are the reading of a Centigrade and Fahrenheit thermometer the same?

The normal temperature of human body is 98.4 °F. It's equivalent temperature in °C is –

A measured temperature in Fahrenheit scale is 200°F. What will be its value in Celsius scale?

Let the average temperatures in Centigrade (C) and Fahrenheit (F) be $\overline{\mathbf{C}}$ and $\overline{\mathbf{F}}$. If $\overline{\mathbf{C}}$ and $\overline{\mathbf{F}}$ are related to $\mathbf{F} = \frac{9}{5}\mathbf{C} + 32$, then $\overline{\mathbf{F}}$ and $\overline{\mathbf{C}}$ have the relation:

In cold countries, alcohol is preferred to mercury as a thermometric liquid because:

Which one of the following is used as an antifreeze for the automobile engines?

Expansion during heating -

When a glass rod is placed in steam, its length increases but its width:

When ice melts, then-

Thermostat is related to:

The safest temperature for keeping food fresh in a refrigerator is

When soggy biscuits are kept inside the fridge for sometime they become crisp because :

Assertion (A): A piece of ice added to the drink, cools it. Reason (R) : Ice takes latent heat from the drink for melting resulting in the cooling of the drink. Select the correct answer using the codes given below:

Consider the following statements - Assertion (A): If Ice collects in the freezer, the cooling in the refrigerator is affected adversely. Reason (R) : Ice is a poor conductor. Select the correct answer using the codes given below: Code :

Which of the following statements is not true?

Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): Relative humidity decreases with increasing air temperature. Reason (R): Absolute humidity increases with increasing evaporation. Select the correct answer from the codes given below:

In which of the following conditions will wet clothes dry earliest?

On adding common salt to water, the boiling point and freezing point of water will :

A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by

In order to avoid sunlight, which of the following colour combination for an umbrella is most appropriate?

It is more comfortable to wear white cloth in summer because

Consider the following statements : Assertion (A) : Light coloured clothes are preferred in summer. Reason (R) : Light colours are poor absorbers of heat. Select correct answer from the code given below :

Loss of water from the body through perspiration depends on :

In an earthen pitcher, the water remains cold due to the process of

In the season of summer, we experience a humid heat when weather :

Xeric condition refers to –

The atmosphere exerts enormous pressure on us. But, we do not feel it because

Why does water boil at a temperature below 100°C at higher altitudes ?

Assertion (A) : The boiling point of water decreases as the altitude increases. Reason (R) : The atmospheric pressure increases with altitude. Code :

Food gets cooked faster in a pressure cooker because –

Maximum temperature inside pressure cooker depends on :

When a bottle is filled with water and it is freezing the bottle breaks down, because-

The cloudy nights are warmer than clear nights because-

Which one of the following reflects back more sunlight as compared to other three?

Fruits stored in a cold chamber exhibit longer storage life, because :

Assertion (A): Woollen clothes keeps us warm. Reason (R): Woollen fibres are made from a special type of protein, which is a bad conductor of heat. Select the correct answer from the codes given below: