Class 4 Science Lesson 1 Notes
#Unit -1 Scientific Learning
Exercise
1. Choose the appropriate word and fill in the blank:
Smelled, scientific, safety, observation, sense organs, tasted
(a) During observation, sense organs have an important role.
(b) Safety must be applied in laboratories.
(c) Chemicals in the laboratory must not be tasted and smelled.
(d) External characteristics of objects and events can be found from observation.
2. Mark (√) if correct and (X) if incorrect:
(a) Observation is not a part of scientific learning. X
(b) Experimentation is an integral part of scientific learning. √
(c) We must not run recklessly in a science laboratory. √
(d) Apparatus must be kept at the right place after use in the laboratory. √
3. Answer the following questions.
a) What is meant by scientific learning?
Answer👉 Scientific learning means learning about things by observing, asking questions, and doing experiments.
b) Why is observation important in scientific learning?
Answer👉 Observation is important because it helps us see and understand what is happening around us.
c) State the importance of doing experiments in scientific learning.
Answer👉 Experiments help us find out if our ideas are correct. When we do an experiment, we try something out to see what happens. It helps us understand science better and makes learning more fun and practical.
d) How does asking questions help in scientific learning?
Answer👉 Asking questions helps us to think more deeply about what we are learning. It makes us curious and helps us find out new things. It also helps us clear our doubts and learn better from our teachers, books, or experiments.
e) State any four safety measures to be applied in a science laboratory.
Answer👉 Any four safety measures to be applied in a science laboratory are as follows:
- Do not touch chemicals without permission.
- Do not run in the laboratory.
- Wear safety glasses if needed.
- Keep things in their proper place after use
f) You noticed a new plant in your garden. Now, what will you do to find out the characteristics of this plant?
Answer👉 I will observe its size, color, leaves, and flowers. I will also ask my teacher or look in a book to learn more.
g) While Sabina was working in a science laboratory, a beaker fell off from her hand and broke. What should she do now?
Answer👉 While Sabina was working in a science laboratory, a beaker fell off from her hand and broke. She should stay calm, tell the teacher, and not touch the broken glass.
Exercise
1. Select the correct answer to the following questions.
a. What is a kilogram weight used for?
👉ii. to measure the quantity of matter in an object. ✅
b. What is used for measuring the length of an object?
👉i. ruler ✅
c. How should the schematic diagram be?
👉ii. simple and clear ✅
d. Which of the following is a rule for drawing a schematic diagram?
👉ii. We should use a single line to sketch the diagram. ✅
2. Fill in the blanks with suitable words:
Watch, measurement, kilogram, metre, traditional
a) Comparison of a quantity of matter is measurement.
b) While buying ropes and wires, they are measured in metre.
c) Watch is used for measuring time.
d) Maana, paathi, are traditional system of measurement.
3. Tick the correct statement with (√) sign and the incorrect statement with (x) sign.
a) Measurement helps us to compare objects’ lengths. (√)
b) By measuring, we can tell whether the object contains a large or small quantity. (√)
c) Pan balance is used for measuring time. (X)
d) Schematic diagrams are complex. (X)
4. Match the following:
1. Inch tape (iii) to measure length
2. Stopwatch (iv) to measure time
3. Balance (ii) to measure the mass of a substance
4. Maana (i) to measure volume of matter
5. Give a brief answer to the following questions.
a) What is meant by measurement?
👉Measurement is the process of comparison of an unknown physical quantity with the known standard quantity.
b) Write the importance of measurement.
👉Measurement helps us compare things, know exact amounts, and do work correctly in daily life.
c) How is the volume of water measured?
👉The volume of water is measured using containers like litres, maana, or measuring jars.
d) What is a unit?
👉A unit is a standard quantity used for measuring other quantities of the same kind.
e) Rama has two buckets of the same height. They are full of water. Her mother asked which bucket has more water. Describe the steps Rama should follow to find the answer to her mother’s question.
👉Rama should take the same measuring container (like a jug or mug) and pour water from each bucket into it, one by one, counting how many times it fills. The bucket that fills the container more times has more water.
