Students can practice the best Class 9 Science MCQ and Class 9 Science Exploration Chapter 1 MCQ Online Test with Answers Exploration Entering the World of Secondary Science for exam preparation.
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 does science use to make sense of the complexity of the natural world?
(a) Experiments alone
(b) Models
(c) Calculations only
(d) Observations only
Answer:
(b) Models
Question 2.
What does a scientific model do?
(a) Gives the exact and complete picture of reality
(b) Focuses on all details equally
(c) Simplifies a real system by focusing only on what matters for a given question
(d) Replaces experiments entirely
Answer:
(c) Simplifies a real system by focusing only on what matters for a given question
Question 3.
When studying a falling object, why might air resistance be ignored in a simple model?
(a) Air resistance does not exist
(b) Air resistance is always zero
(c) Because gravity is not important
(d) To focus on understanding the basic effect of gravity
Answer:
(d) To focus on understanding the basic effect of gravity
Question 4.
In the cricket shot example, which of the following details would be MOST important to include in a model to predict if the ball crosses the boundary?
(a) The mass of the ball and the speed at which it was hit
(b) The brand of the hat
(c) The colour of the ball
(d) The amount of grass on the field
Answer:
(a) The mass of the ball and the speed at which it was hit
Question 5.
Why does science use a shared language of specific terms, symbols, and units?
(a) To make science harder to learn
(b) To allow scientists across the world to describe observations and compare results. and build ideas together
(c) To limit who can study science
(d) Because everyday language is too long
Answer:
(b) To allow scientists across the world to describe observations and compare results. and build ideas together
Question 6.
What does the symbol ‘c’ represent in science, and where does it come from?
(a) Speed of sound, from the English word “current”
(b) Speed of chemical reactions, from the word “chemistry”
(c) Speed of light, from the Greek word “cosmos”
(d) Speed of light, from the Latin word “celeritas” meaning speed.
Answer:
(d) Speed of light, from the Latin word “celeritas” meaning speed.
Question 7.
What is the role of mathematics in science?
(a) It is a language that helps express relationships between quantities clearly and test ideas carefully
(b) It is just a tool for calculation
(c) It is only useful in physics, not biology
(d) It makes science more difficult and is best avoided
Answer:
(a) It is a language that helps express relationships between quantities clearly and test ideas carefully
Question 8.
A passenger aircraft once ran out of fuel mid- flight because the ground crew used pounds per litre instead of kilograms per litre. What does this incident demonstrate?
(a) Aircraft should not use fuel
(b) Mathematics is not important in science
(c) Using inconsistent units can lead to dangerous errors
(d) Kilograms and pounds are equal
Answer:
(c) Using inconsistent units can lead to dangerous errors
Question 9.
Why is using standard units important in everyday life and science?
(a) To ensure measurements mean the same thing everywhere and allow fair comparison
(b) Because different countries use different systems
(c) To make measurements more complicated
(d) Standard units are only important in laboratories
Answer:
(a) To ensure measurements mean the same thing everywhere and allow fair comparison
Question 10.
In science, what is a “law”?
(a) A rule made by the government about science
(b) A guess about how things work
(c) A regular pattern observed in nature, often expressed using words or mathematical relationships
(d) A final and unchangeable truth
Answer:
(c) A regular pattern observed in nature, often expressed using words or mathematical relationships
Exploration Entering the World of Secondary Science Class 9 Assertion and Reason Questions
Directions: The questions given below contain: Statement 1 (Assertion-A) and Statement 2 (Reason-R).
Each question has four options, (a), (b), (c), and (d), out of which only one is correct. Choose the correct option as under:
(a) 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): A law usually describes a regular pattern observed in nature
Reason (R): Newton’s laws of motion explain the jerk felt when a bus stops suddenly.
Answer:
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Question 2.
Assertion (A): Models simplify real systems.
Reason (R): They ignore less important details.
Answer:
(a) Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
Question 3.
Assertion (A): Many words that we use in everyday life have specific meanings in science.
Reason (R): These meanings are often very specific because scientific ideas must be communicated clearly and unambiguously.
Answer:
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Exploration Entering the World of Secondary Science Class 9 Fill in the blanks
1. A ………………………… is a simplified representation of reality.
Answer:
model
2. …………………………. explained how the colour of stars is connected to their temperature.
Answer:
Meghnad Saha
3. ………………………… is used to express relationships between quantities.
Answer:
Mathematics
4. Units used worldwide are called …………………….. units.
Answer:
standard/SI
5. A scientific law describes a ……………………. in nature.
Answer:
pattern.
6. Predictions are based on ……………………. and reasoning.
Answer:
evidence
7. Estimation gives ………………………….. values.
Answer:
Approximate