Bihar Board 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. Match each term with its correct meaning: P. Observation 1. A possible explanation that can be tested Q. Hypothesis 2. Noting facts using the senses or instruments R. Conclusion 3. The result decided after testing Choose the correct matching.

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

   Observation is noting facts, a hypothesis is a testable explanation, and a conclusion is the decided result after testing.

2. Q2. Three of the following are steps a scientist follows while exploring a problem, and one is not part of this process. Pick the 'odd one out'.

   • A. Making careful observations
   • B. Testing the idea and drawing a conclusion
   • C. Forming a hypothesis
   • D. Accepting an idea as true without testing it
   Solution

   Observing, forming a hypothesis and testing are steps of the scientific method; accepting without any test is against the scientific way.

3. Q3. Four students describe the same leaf. Which description is purely qualitative (based on quality, not measured number)?

   • A. The leaf is green and smooth
   • B. The leaf is $8\ \text{cm}$ long
   • C. The leaf weighs $2\ \text{g}$
   • D. The leaf has an area of $15\ \text{cm}^2$
   Solution

   A qualitative description tells about kind or quality (like colour), while quantitative descriptions give measured numbers.

4. Q4. A scientist thinks: 'If plants need sunlight to make food, then a plant kept in the dark should not grow well.' She then keeps one plant in light and one in the dark to check this. The darkened plant kept for comparison is the part of the test that:

   • A. Tests the hypothesis by changing only one condition
   • B. Replaces the need for any observation
   • C. Proves the hypothesis true before any observation
   • D. Is the final conclusion of the experiment
   Solution

   To test a hypothesis fairly, we compare and observe the result of changing one condition, here the absence of light.

5. Q5. Assertion (A): Before concluding that a new medicine works, scientists test it on many patients, not just one. Reason (R): A conclusion in science becomes trustworthy when it is supported by many observations rather than a single case. Choose the correct option.

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

   Both are true and R correctly explains A — many observations make a conclusion reliable, so one test is not enough.

Frequently asked questions

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