CBSE Class 8 Science · Ch 1: Exploring the Investigative World of Science

Topics in this test

Difficulty: 3 easy · 9 medium · 18 hard

Sample questions with answers

The first 5 questions of this free test.

1. Q1. Match each step of the investigative method with what a scientist does in it: (i) Question (ii) Hypothesis (iii) Experiment (iv) Conclusion (P) Decides what the results show (Q) Asks what she wants to find out (R) Suggests a testable answer (S) Tests the idea and collects data

   • A. (i)-P, (ii)-R, (iii)-S, (iv)-Q
   • B. (i)-R, (ii)-Q, (iii)-P, (iv)-S
   • C. (i)-Q, (ii)-R, (iii)-S, (iv)-P
   • D. (i)-Q, (ii)-S, (iii)-R, (iv)-P
   Solution

   First a question is asked, then a testable hypothesis is suggested, the experiment tests it and collects data, and finally a conclusion states what the results mean.

2. Q2. Three of the following belong to the process of scientific investigation, while one does not. Pick the 'odd one out'.

   • A. Accepting a guess as final without any testing
   • B. Collecting and recording data
   • C. Making careful observations
   • D. Forming a hypothesis
   Solution

   Guessing an answer and refusing to test it is not scientific; investigation always involves testing ideas with evidence.

3. Q3. In an investigation, four friends describe the same event. Which one is stating a conclusion drawn from evidence rather than a raw observation?

   • A. The ice cube became smaller over ten minutes
   • B. The ice cube felt cold to the touch
   • C. A pool of water formed around the ice cube
   • D. The ice cube melted because the room was warm
   Solution

   A conclusion is a judgement reached after reasoning from collected evidence, while the others simply report what was seen or measured.

4. Q4. Assertion (A): In a scientific investigation, scientists repeat their experiments several times. Reason (R): Repeating an experiment helps check whether the results are reliable and not due to a mistake or chance. Choose the correct option.

   • A. A is true, but R is false
   • B. A is false, but R is true
   • C. Both A and R are true, and R correctly explains A
   • D. Both A and R are true, but R does not explain A
   Solution

   Repeating experiments confirms that results are dependable, so both the assertion and the reason are correct and the reason explains the assertion.

5. Q5. Read the two statements about the investigative process of science. Statement 1: A hypothesis that is not supported by the experiment's results must be rejected or changed. Statement 2: An experiment can only prove a hypothesis right and never show it to be wrong. Which is correct?

   • A. Statement 1 is wrong and Statement 2 is correct
   • B. Both statements are wrong
   • C. Both statements are correct
   • D. Statement 1 is correct and Statement 2 is wrong
   Solution

   Experiments can support or disprove a hypothesis; if the evidence does not agree, the hypothesis is changed or rejected.

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