Practicing Class 9 Science MCQ and Class 9 Science Exploration Chapter 1 MCQ Online Test with Answers Exploration Entering the World of Secondary Science daily helps in time management.
Class 9 Science Chapter 1 Exploration Entering the World of Secondary Science MCQ
Exploration Entering the World of Secondary Science MCQ
Class 9 Science Chapter 1 MCQ online test
Question 1.
What is the main purpose of using models in science?
(a) To make experiments complicated
(b) To represent reality exactly
(c) To simplify complex systems
(d) To avoid observations
Answer:
(c) To simplify complex systems
Question 2.
Scientific predictions are best described as:
(a) Random guesses
(b) Based on evidence and reasoning
(c) Always correct
(d) Based on opinions
Answer:
(b) Based on evidence and reasoning
Question 3.
Which of the following best describes a scientific law?
(a) Explains causes
(b) Describes patterns
(c) Makes assumptions
(d) Predicts future only
Answer:
(b) Describes patterns
Question 4.
Why are SI units important in science?
(a) They increase calculations
(b) They avoid confusion in measurements
(c) They reduce observations
(d) They replace experiments
Answer:
(b) They avoid confusion in measurements
Question 5.
Mathematics in science is mainly used to:
(a) Memorise formulas
(b) Replace experiments
(c) Express relationships clearly
(d) Avoid reasoning
Answer:
(c) Express relationships clearly
Exploration Entering the World of Secondary Science Class 9 Assertion and Reason Questions
Directions: For Questions number (i) to (ii), two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.
Question 1.
Assertion (A): Models are used in science to study complex systems.
Reason (R): Real-world systems are often too complicated to study in full detail.
Answer:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Explaination:
Models simplify complexity to make analysis possible.
Question 2.
Assertion (A): Predictions in science are always correct.
Reason (R): Predictions depend on models and assumptions
Answer:
(d) Assertion (A) is false, but Reason (R) is true.
Explaination:
Predictions may fail especially if evidence is incorect.
Exploration Entering the World of Secondary Science Class 9 Fill in the Blanks
1. Science uses ___________ to represent simplified versions of real systems.
Answer:
models
2. Scientific ideas are always open to ___________ as new evidence appears.
Answer:
improvement
3. Quantities like velocity and force are represented using ___________.
Answer:
symbols
4. A ___________ explains why certain patterns occur in nature.
Answer:
theory
5. Approximate calculations are known as ___________.
Answer:
estimation
Exploration Entering the World of Secondary Science Class 9 True or False
1. Scientific theories are just guesses.
Answer:
False
Reason: A theory is based on evidence and careful testing, not guesswork.
2. Ignoring details in a model always leads to wrong results.
Answer:
False
Reason: Details are ignored deliberately to simplify understanding while focusing on the key factors.
3. Predictions in science can be made even without experiments.
Answer:
True
Reason: Established models and laws allow predictions without direct testing.
4. Mathematics is only used for calculations in science.
Answer:
False
Reason: It is used to describe relationships between quantities clearly.
5. Scientific knowledge never changes once established.
Answer:
False
Reason: It evolves when new evidence becomes available.
Exploration Entering the World of Secondary Science Class 9 Match the Following
Question 1.
Match the following items given in Column A with that in Column B:
| Column A | Column B |
| 1. Law | (a) Explains cause |
| 2. Theory | (b) Describes pattern |
| 3. Principle | (c) Simplified system |
| 4. Model | (d) Broad idea |
Answer:
| Column A | Column B |
| 1. Law | (a) Explains cause |
| 2. Theory | (b) Describes pattern |
| 3. Principle | (d) Broad idea |
| 4. Model | (c) Simplified system |
Question 2.
Match the following items given in Column A with that in Column B:
| Column A | Column B |
| 1. Prediction | (a) Approximate answer |
| 2. Estimation | (b) Evidence based expectation |
| 3. Symbols | (c) Represent quantities |
| 4. SI Units | (d) Standard measurement |
Answer:
| Column A | Column B |
| 1. Prediction | (b) Evidence – based expectation |
| 2. Estimation | (a) Approximate answer |
| 3. Symbols | (c) Represent quantities |
| 4. SI Units | (d) Standard measurement |
MCQ On Cell The Building Block of Life Class 9 for Practice
Choose the correct option in the following questions:
Question 1.
Why do scientists use simplified representations while studying natural systems?
(a) To avoid experiments
(b) To reduce complexity
(c) To make results inaccurate
(d) To ignore observations
Question 2.
What is the main function of scientific symbols like m, v, and F?
(a) To decorate equations
(b) To replace units
(c) To represent quantities
(d) To simplify diagrams
Question 3.
Which statement best describes a scientific theory?
(a) A detailed explanation based on evidence
(b) A random idea
(c) A fixed rule
(d) A unit of measurement
Question 4.
What happens when predictions do not match observations?
(a) They are ignored
(b) They are accepted anyway
(c) Models are re-examined
(d) Experiments are stopped
Question 5.
Why are SI units used globally?
(a) To increase calculations
(b) To avoid misunderstandings
(c) To reduce experiments
(d) To change results
Assertion-Reason Questions:
Directions: For Questions number (i) to (ii), two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.
Question 1.
Assertion (A): Models are used to study real-world systems.
Reason (R): Real systems are often too complex to study fully.
Question 2.
Assertion (A): Scientific predictions are always accurate.
Reason (R): Predictions depend on assumptions and models.
Fill in the blanks:
1. Scientific models are built using ___________ and simplifications.
2. A ___________ describes a regular pattern observed in nature.
3. Mathematics helps express _____ between quantities.
4. Scientific knowledge improves with new ___________.
5. Rough calculations used to check answers are called ___________.
State whether the statements given below are True or False:
1. Scientific models always include every detail of a system.
2. Predictions in science are based only on guesswork.
3. Scientific ideas can change when new information is discovered.
4. Standard units help scientists communicate effectively.
5. Mathematics in science is only useful for calculations.
Match the Columns:
Match the following items given in Column A with that in Column B:
| Column A | Column B |
| 1. Model building | (d) Measure quantities accurately |
| 2. Symbols | (c) Changes with new evidence |
| 3. Scientific knowledge | (b) Represent physical quantities |
| 4. Units | (a) Ignoring less important details |