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

Topics in this test

Difficulty: 3 easy · 8 medium · 19 hard

Sample questions with answers

The first 5 questions of this free test.

1. Q1. A student's experiment gives a result that is the opposite of his hypothesis. According to the scientific way of working, what should he do?

   • A. Accept the result honestly and change or improve the hypothesis
   • B. Stop doing science forever
   • C. Hide the result because it is wrong
   • D. Change the recorded data to match the hypothesis
   Solution

   If the evidence disagrees with the hypothesis, a scientist honestly accepts the result and changes the hypothesis rather than hiding the data.

2. Q2. Pick the odd one out among the following steps of a scientific investigation.

   • A. Asking a question
   • B. Doing an experiment
   • C. Observing carefully
   • D. Ignoring any result that does not match the guess
   Solution

   Observing, questioning and experimenting are active steps of investigating, while ignoring unexpected results goes against honest science.

3. Q3. In an experiment on how fast ice melts, a student changes the room temperature while keeping the size of ice cubes the same and measures the melting time. Here, the thing the student deliberately changes (the temperature) is the:

   • A. Final conclusion of the experiment
   • B. Result that is being measured
   • C. Factor being changed and tested in the investigation
   • D. Factor kept the same throughout
   Solution

   The factor you deliberately change in an investigation is the variable being tested; the rest are kept the same.

4. Q4. Four students explain why science keeps progressing. Which explanation fits the investigative spirit of science described in the chapter?

   • A. Results are accepted without any testing
   • B. Only very old ideas are allowed and never checked
   • C. People stop asking questions once a book is printed
   • D. People keep asking new questions and investigate to find answers
   Solution

   Science grows because people stay curious and keep asking new questions about what they observe.

5. Q5. A scientist predicts, "If I heat the metal rod, it will become longer." She then heats the rod and measures its length before and after. What is she mainly doing when she heats the rod and measures it?

   • A. Writing the final law of science
   • B. Carrying out an experiment to test the prediction
   • C. Forming the hypothesis for the first time
   • D. Making a random guess
   Solution

   Testing a prediction by doing something and measuring the result is carrying out an experiment.

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