Class 9 Science - Exploration: Entering the World of Secondary Science - Variables in an experiment Medium Quiz

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एक छात्र प्रकाश की अवधि का पौधे की वृद्धि पर प्रभाव जांचता है। स्वतंत्र चर कौन सा है?

A student investigates the effect of light duration on plant growth. What is the independent variable?

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Correct Answer

B. प्रकाश की अवधिDuration of light

Step 1

Concept

The deliberately changed factor is the independent variable. Here the duration of light is changed.

Step 2

Why this answer is correct

The correct answer is B. प्रकाश की अवधि / Duration of light. The deliberately changed factor is the independent variable. Here the duration of light is changed.

Step 3

Exam Tip

जानबूझकर बदला गया कारक स्वतंत्र चर है। यहां प्रकाश की अवधि बदली जाती है।

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निष्पक्ष जांच में नियंत्रित चर रखने का उद्देश्य क्या है?

What is the purpose of controlled variables in a fair test?

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Correct Answer

D. अन्य कारकों को समान रखनाTo keep other factors the same

Step 1

Concept

Keeping other factors the same allows the effect of only the independent variable to be observed. This is the basis of a fair comparison.

Step 2

Why this answer is correct

The correct answer is D. अन्य कारकों को समान रखना / To keep other factors the same. Keeping other factors the same allows the effect of only the independent variable to be observed. This is the basis of a fair comparison.

Step 3

Exam Tip

अन्य कारकों को समान रखने से केवल स्वतंत्र चर का प्रभाव देखा जाता है। यही निष्पक्ष तुलना का आधार है।

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कौन सा प्रश्न दो चरों के बीच संबंध स्पष्ट करता है?

Which question clearly shows a relationship between two variables?

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Correct Answer

A. नमक की मात्रा पानी के क्वथन समय को कैसे प्रभावित करती हैHow does the amount of salt affect the boiling time of water

Step 1

Concept

This question contains two measurable variables amount of salt and boiling time. Keep cause and effect clear in a scientific question.

Step 2

Why this answer is correct

The correct answer is A. नमक की मात्रा पानी के क्वथन समय को कैसे प्रभावित करती है / How does the amount of salt affect the boiling time of water. This question contains two measurable variables amount of salt and boiling time. Keep cause and effect clear in a scientific question.

Step 3

Exam Tip

इस प्रश्न में नमक की मात्रा और क्वथन समय दो माप योग्य चर हैं। वैज्ञानिक प्रश्न में कारण और प्रभाव स्पष्ट रखें।

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वैज्ञानिक प्रश्न में कारण और प्रभाव का संबंध दिखाने वाला वाक्यांश कौन सा है?

Which phrase shows a cause and effect relationship in a scientific question?

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Correct Answer

A. कैसे प्रभावित करता हैHow does it affect

Step 1

Concept

A question using how does it affect shows a relationship between two variables. Such a question is usually testable.

Step 2

Why this answer is correct

The correct answer is A. कैसे प्रभावित करता है / How does it affect. A question using how does it affect shows a relationship between two variables. Such a question is usually testable.

Step 3

Exam Tip

कैसे प्रभावित करता है वाला प्रश्न दो चरों का संबंध बताता है। ऐसा प्रश्न प्रायः जांच योग्य होता है।

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यदि केवल एक कारक का प्रभाव जानना हो तो अन्य कारकों के साथ क्या करना चाहिए?

What should be done with other factors if the effect of only one factor is to be studied?

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Correct Answer

C. उन्हें समान रखना चाहिएThey should be kept the same

Step 1

Concept

Keeping other factors the same makes the effect of the independent variable clear. This is called a fair test.

Step 2

Why this answer is correct

The correct answer is C. उन्हें समान रखना चाहिए / They should be kept the same. Keeping other factors the same makes the effect of the independent variable clear. This is called a fair test.

Step 3

Exam Tip

अन्य कारकों को समान रखने से स्वतंत्र चर का प्रभाव स्पष्ट होता है। इसे निष्पक्ष जांच कहते हैं।

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कौन सा प्रश्न इतना व्यापक है कि उसे अधिक स्पष्ट बनाना चाहिए?

Which question is so broad that it should be made more specific?

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Correct Answer

D. पौधे कैसे बढ़ते हैंHow do plants grow

Step 1

Concept

How do plants grow is too broad and lacks clear variables. Narrow it to one measurable factor.

Step 2

Why this answer is correct

The correct answer is D. पौधे कैसे बढ़ते हैं / How do plants grow. How do plants grow is too broad and lacks clear variables. Narrow it to one measurable factor.

Step 3

Exam Tip

पौधे कैसे बढ़ते हैं बहुत व्यापक है और इसमें स्पष्ट चर नहीं हैं। इसे किसी एक माप योग्य कारक तक सीमित करें।

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