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Class 8 Exploring the Investigative World of Science worksheet
CBSE Science. Planning investigations: what to change, keep the same and measure; observations and hypotheses. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
In an investigation, the thing you deliberately change is the:
- thing you keep the same
- conclusion
- result you measure
- variable you test
Answer
(d) variable you test
- 2.
To test whether the temperature of the oil affects puffing, which ONE thing should you change?
- how the puri is dropped into the oil
- the size of the puri
- the temperature of the oil
- the type of flour
Answer
(c) the temperature of the oil
change one thing, keep the rest the same
- 3.
Which of these can be MEASURED?
- how lucky the day is
- how much the cook likes it
- whether the puri looks happy
- the mass of a dough ball in grams
Answer
(d) the mass of a dough ball in grams
Section B · short answer
- 4.
What is a variable in an investigation?
Answer
Something that can change or be changed, such as the thickness of dough or the oil temperature.
- 5.
Write "observation" or "hypothesis": (a) the thinner side may be the side that touched the oil first (b) one side of the puri was thinner
Answer
(a) hypothesis (b) observation
Section C · long answer
- 6.
Plan an investigation into why a puri puffs up. Say what you will change, keep the same and measure.
Answer
Change one thing, for example the thickness of the dough. Keep the flour, size, oil temperature and the way it is dropped in the same. Measure whether it puffs and how many seconds it takes. Repeat each test and record the results in a table.
Fresh sheets for your child
In the app, every Exploring the Investigative World of Science sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.