CBSE Class 9 Science · Ch 1: Exploration: Entering the World of Secondary 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. A student claims, "Plants kept in sunlight grow taller than plants kept in the dark." To test this fairly, which pair should be made different between the two sets of plants?

   • A. Amount of light only
   • B. Amount of light and amount of water
   • C. Amount of water and type of soil
   • D. Type of plant and amount of light
   Solution

   Only the factor being tested (light) should differ, while water, soil and plant type are kept the same so the result depends on light alone.

2. Q2. Match each term with its correct meaning: (P) Hypothesis (Q) Observation (R) Conclusion (1) What we notice using our senses (2) A possible answer to be tested (3) The decision reached after analysing results

   • A. P-3, Q-1, R-2
   • B. P-2, Q-1, R-3
   • C. P-1, Q-2, R-3
   • D. P-2, Q-3, R-1
   Solution

   A hypothesis is a testable guess, an observation is what we notice, and a conclusion is the final decision based on the results.

3. Q3. Assertion (A): In a fair scientific test, only one factor is changed at a time. Reason (R): If many factors are changed together, we cannot tell which factor caused the change in the result. Choose the correct option.

   • A. A is true but R is false
   • B. Both A and R are true, but R is not the correct explanation of A
   • C. Both A and R are true, and R is the correct explanation of A
   • D. A is false but R is true
   Solution

   Changing one factor at a time lets us link the result to that factor alone, so R correctly explains A.

4. Q4. Three of the following belong together as steps a scientist takes while exploring a problem; one does not fit the same group. Pick the odd one out.

   • A. Memorising facts without questioning them
   • B. Forming a hypothesis
   • C. Asking a question about what is observed
   • D. Performing an experiment to test an idea
   Solution

   Asking a question, forming a hypothesis and doing an experiment are active steps of inquiry; simply memorising facts is not a step of scientific exploration.

5. Q5. Four students measure the length of the same pencil and record $15.2$ cm, $15.1$ cm, $15.2$ cm and $15.3$ cm. What does repeating the measurement and finding values close to one another mainly show?

   • A. The pencil is changing its length
   • B. The instrument is broken
   • C. The measurement is reliable
   • D. Measurement is not needed in science
   Solution

   When repeated measurements give nearly the same value, we can trust the measurement as reliable.

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