MOECDC Class 8 Scientific Learning
MOECDC Class 8 Science and Technology | Scientific Learning | Nepal Class 8 | Exercise | Question Answer.
MOECDC Class 8 English Medium Science Chapter 1 Scientific Learning Exercise Question Answer Solution.
| Board | Government of Nepal. |
| Class | Eight (8). |
| Subject | Science and Technology. |
| Chapter | Electricity and Magnetism |
| Topic | Exercise Solve / Question Answer / Notes. |
(1) Choose the correct alternatives.
(a) What is the process of experiencing an object, event or process carefully through the sense organs?
(i) test
(iii) curiosity
(ii) hypothesis
(iv) observation
Answer :
(iv) Observation – is the process of experiencing an object, event or process carefully through the sense organs.
(b) Which of the following methods is suitable if one has to study whether the farmers of a region use more chemical or organic fertilizers?
(i) observation
(iii) research
(ii) test
(iv) survey
Answer :
(iii) Research – is suitable method if one has to study whether the farmers of a region use more chemical or organic fertilizers.
(c) Which of the following would you stop your friend from doingin the laboratory?
(i) Tasting or smelling laboratory chemicals.
(ii) Wearing a lab coat.
(iii) Boiling water in a beaker.
(iv) Using test tube holder while heating it.
Answer :
I would stop my friend from – (i) Tasting or smelling laboratory chemicals in the laboratory.
(d) What should be done while performing a chemical reaction that produces fumes?
(i) Hands should be kept away.
(ii) It should be carried out on a table.
(iii) It should be kept on a stand.
(iv) It should be carried in a hood.
Answer :
(iv) It should be carried in a hood – while performing a chemical reaction that produces fumes.
(e) Which is the first step of a scientific study?
(i) investigation
(iii) testing
(ii) observation
(iv) experimentation
Answer :
(ii) observation
(2) Distinguish between:
(a) Observations and tests
Answer :
Observations and tests – In observations, we can only make some assumptions by observing but by testing, we can check whether our assumptions are correct or not.
(b) Research and survey
Answer :
Research and survey – Research is a study in depth or to find an answer to a question or curiosity but the process of collecting data related to a topic or problem directly and deriving a conclusion is called a survey.
(3) Write the reason:
(a) Precautions should be taken while conducting experimental work.
Answer :
Precautions should be taken while conducting experimental work: Random scientific work without following safety measures may cause accidents as well as affect the results of observations, tests and experiments.
(b) A report is prepared after the experiment and survey are done.
Answer :
A report is prepared after the experiment and survey are done: The report of the experiment or survey helps us to express information fully and in an organized manner and also helps us to study a research topic thoroughly.
(c) Observation is the first step in scientific learning.
Answer :
Observation is the first step in scientific learning: The rules, principles and characteristics of science can be studied by observing various natural and artificial objects, processes and events around the school and home.
(4) Write the answers to the given questions:
(a) What is observation?
Answer :
The process of experiencing an object, event or process very carefully using the sense organs is called observation.
(b) What is the importance of observation in scientific work?
Answer :
Observation is important in scientific work. The rules, principles and characteristics of science can be studied by observing various natural and artificial objects, processes and events around the school and home. Apart from that, some laws and principles related to science can be observed even by visiting zoos, botanical gardens, pharmaceutical companies and information communication companies.
(c) What is done in scientific work when there is not enough information from observation?
Answer :
When there is not enough information from observation in scientific work, a certain scientific procedure called test is followed in or outside the laboratory to check whether the assumption is correct or not.
(d) What precautions should be taken while carrying out a scientific experiment?
Answer :
The precautions that should be taken while carrying out a scientific experiment are,
(i) Masks, gloves and goggles should be worn while using harmful chemicals,
(ii) An apron or a lab coat must be put on while working in the laboratory,
(iii) Hands should be washed thoroughly with soap after the experimental work,
(iv) Everyone should be aware of the emergency exit.
(e) List the things that should be done and should not be done while working in the laboratory.
Answer :
The things that should be done while working in the laboratory,
(i) Masks, gloves and goggles should be worn while using harmful chemicals,
(ii) An apron or a lab coat must be put on,
(iii) Hands should be washed thoroughly with soap after the experimental work,
(iv) The prescribed method should be used while performing experimental work,
(v) Special care should be taken while using a burner or touching hot objects.
The things that should not be done while working in the laboratory,
(i) The materials should not be handled haphazardly,
(ii) Eating and drinking should not be done in the laboratory,
(iii) No playing and teasing in the laboratory,
(iv) Chemicals must not be tasted or smelled in the lab,
(v) Hot equipment should not be placed directly on the table during the experimental works.
(f) Whatshould we pay attention to while researching?
Answer :
While researching, we have to patiently study a subject by completing a certain procedure. Even if we fail many times, we should try again by finding the weaknesses and improving on them. We have to follow different scientific methods while conducting research work.
(g) In what conditions is the survey conducted?
Answer :
The survey is conducted in some conditions which are, selection of objective, choice of data collection method, collection of data, analysis of data and conclusion.
(h) What is meant by survey tools? Write with examples.
Answer :
The methods of data collection are meant by survey tools. Examples – Questionnaires, interviews, discussions and observations.
(i) Elina is interested to study the requirements of sunlight for green plants. Suggest a clear method for her how to conduct that study.
Answer :
Elina is interested to study the requirements of sunlight for green plants. To conduct that study she can use scientific test.
(j) A class had to be conducted in the absence of the science teacher in grade eight. Prepare a worksheet for conducting a practical class on the study of plant and animal cells.
Answer :
More Solutions :
👉 (2) Information and Communication Technology
👉 (3) Living Beings and Their Structure
👉 (4) Biodiversity and Environment
👉 (8) Electricity and Magnetism
