Heat quiz

The normal temperature of the human body is about:

The range of a clinical thermometer is:

Which is a good conductor of heat?

Heat from the Sun reaches the Earth by:

In liquids and gases, heat is mainly transferred by:

A sea breeze blows:

We prefer light-coloured clothes in summer because they:

Woollen clothes keep us warm because wool:

A laboratory thermometer generally reads from:

The kink in a clinical thermometer:

Why is a laboratory thermometer not used to measure body temperature? (2 marks)

Why should a thermometer not be held by its bulb while reading? (2 marks)

Why are digital thermometers preferred over mercury thermometers? (2 marks)

Why do we feel cooler under a tree than under a tin shed? (2 marks)

Why is it better to wear two thin blankets than one thick blanket of the same weight? (2 marks)

Why is the bottom of a cooking pan often made of copper? (2 marks)

What is a land breeze? Why does it blow at night? (2 marks)

Does radiation need a medium? Give an example. (2 marks)

Why do we feel warm near a fire even when not touching it? (2 marks)

Why does a black umbrella get hotter in the sun than a white one? (2 marks)

The maximum and minimum temperatures of a city on four days were (38, 26), (40, 27), (36, 24) and (41, 29) degrees C. Find the difference between maximum and minimum for each day and the mean maximum temperature. (3 marks)

A laboratory thermometer shows water at 25 degrees C. It is heated until it boils at 100 degrees C. Find the rise in temperature. If it rose evenly in 15 minutes, find the rise per minute. (3 marks)

A patient's temperature is 102.2 degrees F. Using C = (F - 32) x 5/9, convert it to degrees C. By how much is it above normal (37 degrees C)? (3 marks)

Equal amounts of water in two cans, one black and one white, were placed in the sun. After an hour the black can was at 52 degrees C and the white at 41 degrees C, starting from 30 degrees C. Find the rise in each and explain the difference. (3 marks)

One division on a thermometer scale is 0.1 degrees C. A mercury thread moved 25 divisions above 36.5 degrees C. Find the reading. Is the person feverish? (3 marks)

Read the passage and answer the questions. In coastal Chennai, a cool breeze blows from the sea in the afternoon, while at night the breeze blows from the land towards the sea. (i) Why does land heat up faster than water during the day? (ii) Name the daytime breeze and explain it. (iii) Name the night breeze. (5 marks)

Read the passage and answer the questions. Boojho's mother uses a steel pan with a plastic handle and puts a wooden spoon in the curry. (i) Why is the pan made of steel? (ii) Why does the handle have plastic? (iii) Why is a wooden spoon better than a steel spoon for stirring? (5 marks)

Read the passage and answer the questions. A doctor shakes a clinical thermometer before placing it under a patient's tongue and reads it after one minute. (i) Why is it shaken? (ii) Why is it kept for about one minute? (iii) What is the normal reading? (5 marks)

Read the passage and answer the questions. Paheli placed a few crystals of potassium permanganate at the bottom of a beaker of water and heated it gently below the crystals. (i) What did she observe? (ii) Which mode of heat transfer does it show? (iii) Why does hot water rise? (5 marks)

Read the passage and answer the questions. In Rajasthan, houses have thick mud walls and flat roofs painted white, while in the Himalayas people wear thick woollen clothes. (i) Why are the walls thick? (ii) Why are roofs painted white? (iii) How do woollens keep people warm? (5 marks)

Draw a labelled clinical thermometer. Explain the steps to read it correctly and the precautions to be taken. (6 marks)

Describe an experiment with a metal strip and wax pieces to show conduction. Draw the set-up and explain the result. (6 marks)

Explain the formation of sea breeze and land breeze with labelled diagrams. (6 marks)

Compare conduction, convection and radiation with one daily-life example each and draw a diagram of a pan of water on a stove showing all three. (6 marks)

Describe an experiment with two tin cans painted black and white to show which colour absorbs more heat. Draw the set-up and explain how this is used in choosing clothes. (6 marks)