Exploration Entering the World of Secondary Science Class 9 MCQ Questions Science Chapter 1

These Class 9 Science MCQ and Class 9 Science Exploration Chapter 1 MCQ Online Test with Answers Exploration Entering the World of Secondary Science focus on both theory and practical applications.

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.
Science begins with curiosity about natural phenomena. A student notices that the ice melts faster in warm water than in cold water. What question would show scientific curiosity to investigate this observation?
(a) Why is water colourless?
(b) How does water temperature affect ice melting rate?
(c) What colour is ice?
(d) How heavy is ice?
Answer:
(b) How does water temperature affect ice melting rate?

Question 2.
Two students estimate the same value differently, but both are close to the actual value. Based on this information, which of the following statements is correct?
(a) Both estimates are incorrect
(b) Only one estimate is correct
(c) Both estimates are acceptable
(d) Estimation is not useful
Answer:
(c) Both estimates are acceptable

Question 3.
Which statement best explains modelling?
(a) Models reduce accuracy
(b) Models remove complexity for understanding
(c) Models replace real systems
(d) Models can be used only once
Answer:
(b) Models remove complexity for understanding

Question 4.
Which is not part of the scientific process?
(a) Observation
(b) Guesswork
(c Measurement
(d) Experiment
Answer:
(b) Guesswork

Question 5.
Symbols in science are used to:
(a) decorate text
(b) simplify representation
(c) confuse students
(d) replace units
Answer:
(b) simplify representation

Question 6.
Which statement is most scientifically correct?
(a) Science proves everything permanently
(b) Science explains everything completely
(c) Science improves understanding through testing
(d) Science depends on authority
Answer:
(c) Science improves understanding through testing

Question 7.
Why do scientists prefer the kilogram over local weights for experiments?
(a) Kilogram is always heavier
(b) Kilogram ensures results can be compared worldwide
(c) Local weights vary by region
(d) Both (b) and (c)
Answer:
(d) Both (b) and (c)

Question 8.
Standard units are important because they
(a) simplify models
(b) remove the need for experiments
(c) ensure consistency in measurements
(d) replace reasoning
Answer:
(c) ensure consistency in measurements

Question 9.
A scientist ignores friction while studying motion. This means
(a) the study is incorrect
(b) the scientist lacks data
(c) the scientist is simplifying the system
(d) friction does not exist
Answer:
(c) the scientist is simplifying the system

Question 10.
Ignoring minor details in science
(a) reduces accuracy completely
(b) makes results useless
(c) helps focus on important factors
(d) shows lack of knowledge
Answer:
(c) helps focus on important factors

Exploration Entering the World of Secondary Science Class 9 Assertion Reason Questions

Directions (Q. No. 1 to 2): Each question below consists of an Assertion (A) and a Reason (R). Use the following key to choose the appropriate answer.
(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.

Question 1.
Assertion (A): Models simplify real systems.
Reason (R): They ignore less important details.
Answer:
(a) Both A and R are true, and R is the correct explanation of A

Question 2.
Assertion (A): Science proves facts permanently and never changes.
Reason (R): Scientific ideas evolve with new evidence through testing and revision.
Answer:
(d) Scientific knowledge is not permanent; it can change and improve with new evidence and discoveries.

Exploration Entering the World of Secondary Science Class 9 Fill in the blanks

(i) A ……………………… is a simplified representation of reality.
Answer:
model

(ii) ………………………… explained how the colour of stars is connected to their temperature.
Answer:
Meghnad Saha

(iii) ……………………… is used to express relationships between quantities.
Answer:
Mathematics

(iv) Units used worldwide are called …………………. units.
Answer:
standard / SI

(v) A scientific law describes a ………………….. in nature.
Answer:
pattern

(vi) Predictions are based on …………………….. and reasoning.
Answer:
evidence

(vii) Estimation gives ………………….. values.
Answer:
approximate

Exploration Entering the World of Secondary Science Class 9 True or False

(i) Estimation gives exact values.
Answer:
False

(ii) Science is a collection of fixed facts that never change.
Answer:
False

(iii) Symbols in science, such as ‘c’ for speed of light, simplify communication.
Answer:
True

(iv) Science is continuously evolving based on new evidence and experiments.
Answer:
True

(v) Measurements are necessary in scientific exploration.
Ans.
True

Exploration Entering the World of Secondary Science Class 9 Match the Following

Match the items in column A with those in column B.

Column A	Column B
(i) Model	(p) Describes pattern
(ii) Law	(q) Quantifies observation
(iii) Theory	(r) Simplified representation
(iv) Measurement	(s) Explains pattern

Answer:

Column A	Column B
(i) Model	(r) Simplified representation
(ii) Law	(p) Describes pattern
(iii) Theory	(s) Explains pattern
(iv) Measurement	(q) Quantifies observation

The post Exploration Entering the World of Secondary Science Class 9 MCQ Questions Science Chapter 1 appeared first on Learn CBSE.

from Learn CBSE https://ift.tt/ZFG93Np
via IFTTT