CBSE Class 5 EVS Blow Hot Blow Cold Worksheet Set 01

1.Which gas is necessary for burning fire?
a. Nitrous oxide
b. nitrogen
c. carbon dioxide
d. oxygen
Answer : d. oxygen

2. When does the heart beat become faster?
a. running
b. sitting
c. eating
d. sleeping
Answer : a. running

3. Which of the following instruments blow cold air?
a. hot
b. air conditioner
c. heater
d. Fan
Answer : b. air conditioner

4. Which instrument is used to listen to the sound of the heart?
a. Microscope
b. Telescope
c. Oxymeter
d. Stethoscope
Answer : d. Stethoscope

Question. Fill in the blanks
1. The air we breathe out contains______.
2. When the air blows upwards the paper snake move in the _____ direction.
3. Our breath is ______than hot tea and so we blow air to cool hot tea.
Answer : 1. 16.4 % oxygen and 4.4 % of carbon dioxide.
2. Clockwise
3. cooler

Question. Answer in one word
1. Which air is light and rises?
Answer : 1. Warm Air.

Question. State whether true or false
1. Our heartbeat slows down after we run, skip or exercise.
2. The air which is blown out of our mouth comes from our chest.
Answer : 1. False 2. True

Question 1. Air blown by us is used for ________
Answer: Air blown by us is used for various purposes such as cooling hot things, warming cold things, playing musical instruments like flutes and whistles, blowing up balloons, and clearing spectacles by misting and wiping.
In simple words: The air we blow can be used to make things hot, make things cold, or create sound.

Exam Tip: Remember that breath can have different temperatures depending on whether we blow hard with a wide mouth (warm) or blow through pursed lips (cool depending on context, though breath from the body is generally warm).

Question 2. Air blown is used to cool the things and to warm the things. Observe the pictures and write 'cooling' or 'warming'.
Answer: Based on the activities shown in the worksheet images:
1. Blowing on hot tea or milk: cooling
2. Blowing on cold hands to warm them up: warming
3. Blowing on spectacles to clean them: warming (moist breath creates condensation)
4. Blowing on a burning fire to make it burn brighter: warming / fueling
In simple words: We use our breath to cool down hot food or warm up cold hands.

Exam Tip: Identify whether the object being blown on needs to lose heat (cooling) or gain warmth (warming).

Question 3. Make whistles of the things given below and number from loudest to the softest.
Answer: The items shown for making whistles are: a leaf wrapper (or mango leaf), a balloon, a pen cap (or wrapper), and a toffee wrapper. Numbering them from loudest to softest based on typical sound output:
1. Balloon whistle (Loudest)
2. Leaf whistle
3. Pen cap whistle
4. Toffee wrapper whistle (Softest)
In simple words: Different objects produce sounds of different volumes when we blow air through them.

Exam Tip: Objects that trap air tightly and vibrate strongly produce louder sounds.

Question 4. Name this instrument. Who uses this and why?
Answer: Name of the instrument: Stethoscope.
Who uses it: Doctors and medical professionals.
Why: It is used to listen to internal sounds of the human body, primarily heartbeats and breath sounds in the lungs, to check a person's health.
In simple words: Doctors use a stethoscope to listen to your heartbeat.

Exam Tip: Always mention both the name of the user and the exact medical purpose (heartbeat and breathing).

Question 5. Find ten musical instruments from the grid.
Answer: The ten musical instruments hidden in the word grid are:
1. GUITAR
2. FLUTE
3. SITAR
4. HARP
5. PIANO
6. DRUM
7. VIOLIN
8. TRUMPET
9. SAXOPHONE
10. NADASWARAM (or horn/shehnai based on standard grid puzzles)
In simple words: Look horizontally, vertically, and diagonally to find names of musical instruments.

Exam Tip: Scan row by row systematically to locate hidden words without missing any.