Exploring the Investigative World of Science — Practice

Question 1

In the puri experiment, which of these is something you can CONTROL rather than observe?

Accepted Answer

The temperature of the oil

Question 2

Why should only one factor be changed at a time in an experiment?

Accepted Answer

So you can tell which change caused the difference

Question 3

On the pages of Curiosity, the root and the kite stand for:

Accepted Answer

Grounded observation and creative thinking

Question 4

Rewrite the wondering "why does dough rise?" as a question you could actually investigate, and name what you would change and what you would measure.

Accepted Answer

e.g. "Does dough rise more in a warm place than in a cool one?" — change: temperature; measure: height risen in a fixed time

Question 5

A student writes: "A puri puffs because trapped steam inflates it, and the thinner side is the one that faced the oil last." What is wrong with presenting this as the answer?

Accepted Answer

It states a hypothesis as settled fact — the chapter says puri puffing is not fully understood

Question 6

Roughly how many grains of sand are on the world's beaches, and how does that compare with the number of stars in our galaxy?

Accepted Answer

About 10²⁰ grains against about 10¹¹ stars — sand wins by roughly a hundred million times

Question 7

Why is "what happens if I prick a hole in the puri before frying?" a better follow-up question than "what if I use a different brand of flour?"

Accepted Answer

Pricking tests an explanation; changing brand only adds another factor

Question 8

Your friend says a kitchen is not a real laboratory, so nothing done there counts as science. How would you reply?

Accepted Answer

An experiment needs a controllable factor, an observable outcome, fixed conditions and a record — a kitchen supplies all four

Practice — Exploring the Investigative World of Science

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