Science 1 Marks Question

Laboratory thermometer can also be used for measuring body temperature because it is inconvenient for this purpose as it lacks the kink which is present in clinical thermometer.

The pin on the wire in case A will fall first as heat will reach to it before it reaches the pin in case B because the diameter is smaller than the circumference of semi-circle.

As we know that jute sack is thermal insulator, it helps ice not to be melt immediately. So, shopkeepers used to cover ice blocks with jute sacks.

Yes, she can apply the same method to keep a glass of cold drink cool because wool is a thermal insulator and it cannot allow to heat pass through it.

As the temperature increases, then expansion in mercury takes place which leads to the rise in the level of mercury in thermometer.

It is advised not to hold the thermometer bulb while reading it as the level of mercury increases from the actual reading by our body temperature.

In case of two thin blankets, there is an air gap which does not allow heat to pass out from the body and it is not as such in case of one thick blanket.

An umbrella prevent us from the harmful radiation coming from the sun.

By radiation.

In water, mode of heat transfer is convection and in air, mode of heat transfer is radiation.

Because of the kink present in the thermometer, the mercury does not fall or rise.

The clinical thermometer consists of kink which prevents the mercury level from falling on its own.

The net energy transfer does not take place when the temperature of two objects is same.

The level of the mercury changes when the bulb of the thermometer is brought in contact with another object because the temperature of other object may not be the same as that of the bulb of the thermometer.

The clinical thermometer has the range 35°C to 42°C and it is designed to measure the temperature of human body. That's why, paheli stopped him from doing so.

The temperature of every person may not be 37°C. It could be slightly higher or lower. So, we consider the average body temperature for human i.e. 37°C.

India has adopted the celsius scale, so he should read that scale. The other scale with the range 94-108 degrees is the fahrenheit scale (°F) which was used earlier.

Both the conclusions are correct relative to each hand but this shows that we cannot arrive at conclusions just based on our sense of touch.

By using thermometer, we can measure the degree of hotness of a body.

Since, bakelite is an insulator. It does not conduct heat energy. That's why, on touching the bakelite handle of a hot pan, our hand does not burn.

Tea is generally served in China clay cup and plates because China clay is a bad conductor of heat which does not allow the heat to pass through it and hence keeps the tea hot.

Radiation is the mode of transfer of heat in which medium is not required.

Window should preferably face towards the sea beach, so that the sea breeze coming from sea keeps the house cool during the day time.

No, the body temperature of every person is not 37°C. It is an average temperature. It could be slightly higher or slightly lower.

Temperature of other object is measured with laboratory thermometer because clinical thermometer is not suitable for higher temperature.

Examples of conductors are metal and steel and examples of insulators are wood and plastic.

The heat of the Sun reaches us through the process of radiation.

Radiation is the transfer of heat in the form of electromagnetic waves (infrared rays) without the need for any medium.
It can occur through vacuum, like the heat from the Sun reaching the Earth.

Convection is not possible in solids because the particles in solids are fixed in position and can only vibrate around their mean positions.
Since convection requires the bulk movement of particles to transfer heat (as in liquids and gases), solids cannot support this type of heat transfer. In solids, heat is transferred only by conduction.

Heat flow is the transfer of heat from a hotter object to a colder object.