CURIOUSITY QUIZ: HEAT

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Test Your knowledge on 'Heat' prepared exclusively according to the NCERT science curriculum for Class-7 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck!

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What is the temperature of a normal human body in Celsius and Fahrenheit scales respectively ?

1 point

36 °C and 98.6°F respectively

37 °C and 99.6°F respectively

39 °C and 98.6°F respectively

37 °C and 98.6°F respectively

Clear selection

What is the name of the thermometer that is normally used in a weather station to record the highest and the lowest temperatures of a day ?

1 point

Infrared Thermometer

Maximum-Minimum Thermometer

Digital Thermpmeter

Laboratory Thermometer

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The temperature range of a Clinical thermometer and a Laboratory thermometer are respectively :

1 point

(35 °C to 110 °C) and (-10 °C to 42 °C)

(-10 °C to 42 °C) and (35 °C to 110 °C)

(35 °C to 50 °C) and (0 °C to 100 °C)

(35 °C to 42 °C) and (-10 °C to 110 °C)

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It is not convenient to read the body temperature using a Laboratory thermometer. This is because :

1 point

It has a wide temperature range of -10 °C to 110 °C.

The temperature suddenly goes up as it is brought out of the contact of the body .

The temperature suddenly falls down as it is brought out of the contact of the body .

It is not very sensitive like a clinical thermometer.

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The mercury column does not fall suddenly in a Clinical thermometer even if it is brought out of the body. This is because:

1 point

It has a small temperature range of only 35 °C to 42 °C .

A Clinical thermometer is more sensitive than a Laboratory thermometer.

The kink present in the capillary tube of a clinical thermometer does not allow the mercury column to fall back of its own into the bulb.

It has a narrow capillary tube and small bulb compared to a laboratory thermometer.

Clear selection

A structure provided in the Clinical thermometers near the bulb that prevents mercury level from falling down is called :

1 point

Constriction

Separator

Kink

Bend

Clear selection

Heat transfer in a metal takes place due to the process of :

1 point

Convection

Conduction

Both by Conduction and Convection

Radiation

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The transfer of heat between the land and the sea through the land breeze and the sea breeze takes place due to the process of :

1 point

Conduction

Convection

Both Conduction and Convection

Radiation

Clear selection

How does the Sun's heat energy reach the Earth although the intervening space is completely vacuum?

1 point

By conduction

By convection

By radiation

By a combined process of convection and radiation

Clear selection

Although Igloo is made up of ice, it is warmer inside . Why ?

1 point

The hemispherical shape of the Igloo does not allow the heat from inside to pass out.

The closed spherical wall of the Igloo prevents cold air from outside to enter.

The air inside the Igloo , being a bad conductor of heat, traps the heat inside.

The Igloo is made up of ice which is a bad conductor of heat.

Clear selection

Why it is warmer to use two thin blankets rather than a single thick blanket?

1 point

The two thin blankets have more surface area than a single thick blanket.

The two thin blankets have more insulating area than a single thick blanket.

The two thin blankets have more combined thickness than a single thick blanket.

The air trapped between two thin blankets, being a bad conductor of heat, provides an additional insulating layer.

Clear selection

A cloudy night is generally warmer than a clear starlit night. Why?

1 point

Clouds basically consist of water vapour which is a potential greenhouse gas.

Clouds, being bad conductors of heat, does not allow Earth's radiant heat to escape to space.

Clouds retain lot of heat due to high latent heat of water that make up the cloud.

Overcast clouds increases the moisture content of the atmosphere that produces the warmth.

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A thin paper strip tightly wrapped around a solid copper or brass rod does not burn when held over a candle flame. This is because :

1 point

The paper strip is coated with a layer of carbon particles present in the flame that acts like an insulating layer for heat.

The metal rod acts like barrier for the heat to reach to the paper strip.

The metal rod increases the Ignition temperature of the paper strip.

The metal rod rapidly conducts away the heat received to the paper strip that is eventually radiated out.

Clear selection

At what temperature both the Celsius and Fahrenheit scales give the same reading ?

1 point

-50

-40

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The study and the production of very low temperature is called :

1 point

Seismology

Pyrology

Meteorology

Cryogenics

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Which instrument is used to measure very high temperature (like in a Furnace)?

1 point

Six's Thermometer

Cryogenics Thermometer

Pyrometer

Mercury Thermometer

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How many divisions of Fahrenheit scale is equivalent to 1 division in Celsius scale ?

1 point

1.8

1.6

1.5

1.4

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What is the thermometric ( heat sensitive) substance used in a Clinical thermometer ?

1 point

Water

Air

Mercury

Alcohol

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Woolen clothes keep us warm in winter, because wool is a bad conductor of heat. What is the other reason for that ?

1 point

Wool also prevents any heat radiated from the body.

Wool also prevents any heat lost from the body due to convection.

Wool also prevents any heat lost from the body due to Conduction.

There is a layer of air trapped by the woolen cloth and air, being a bad conductor of heat, does not allow the body heat to be lost to outside.

Clear selection

Suppose we take some water in a Round bottom flask and heat it over a Spirit lamp. As we put some crystals of Potassium Permanganate into the liquid, it is seen that it colours the water and the coloured water rises up. Which mode of heat transfer is responsible for this ?

1 point

Conduction

Concection

Radiation

A mixture of Convection and Radiation

Clear selection

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