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experimental groups MCQ Questions for Class 9

experimental groups se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

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3 questions tagged with experimental groups.

Question 1/3 Expert Science Exploration: Entering the World of Secondary Science Hypothesis and experimentation Class 9 Level 9

किसी औषधि के प्रभाव का निष्पक्ष परीक्षण करते समय प्रतिभागियों को समूहों में यादृच्छिक रूप से बाँटने का मुख्य उद्देश्य क्या है?

What is the main purpose of randomly assigning participants to groups in a fair test of a medicine?

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Correct Answer

B. समूहों में पहले से मौजूद भिन्नताओं के प्रभाव को कम करनाReduce the effect of pre-existing differences between groups

Step 1

Concept

Random assignment reduces bias and makes groups more comparable. In exams connect randomisation with fairness.

Step 2

Why this answer is correct

The correct answer is B. समूहों में पहले से मौजूद भिन्नताओं के प्रभाव को कम करना / Reduce the effect of pre-existing differences between groups. Random assignment reduces bias and makes groups more comparable. In exams connect randomisation with fairness.

Step 3

Exam Tip

यादृच्छिक विभाजन पक्षपात घटाता है और समूहों को तुलनीय बनाता है। परीक्षा में यादृच्छिकीकरण को निष्पक्षता से जोड़ें।

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Question 2/3 Expert Science Exploration: Entering the World of Secondary Science Hypothesis and experimentation Class 9 Level 8

एक प्रयोग में छात्रों को उपचार समूह चुनने दिया गया। इससे किस प्रकार की समस्या उत्पन्न हो सकती है?

In an experiment students were allowed to choose their treatment group. What problem may result?

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Correct Answer

A. स्वयं चयन पक्षपातSelf-selection bias

Step 1

Concept

Students choosing groups may already differ in important ways. Understand why random assignment is needed.

Step 2

Why this answer is correct

The correct answer is A. स्वयं चयन पक्षपात / Self-selection bias. Students choosing groups may already differ in important ways. Understand why random assignment is needed.

Step 3

Exam Tip

जो छात्र समूह चुनते हैं उनमें पहले से अलग विशेषताएं हो सकती हैं। परीक्षा में यादृच्छिक आवंटन की आवश्यकता समझें।

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Question 3/3 Expert Science Exploration: Entering the World of Secondary Science Hypothesis and experimentation Class 9 Level 8

दो उर्वरकों की तुलना में पौधों को यादृच्छिक रूप से समूहों में बांटने का मुख्य उद्देश्य क्या है?

What is the main purpose of randomly assigning plants to groups when comparing two fertilizers?

Explanation opens after your attempt
Correct Answer

B. प्रारंभिक भिन्नताओं को समूहों में लगभग समान रूप से बांटनाDistribute initial differences approximately evenly between groups

Step 1

Concept

Random assignment reduces bias from hidden initial differences. Associate it with fair group formation in exams.

Step 2

Why this answer is correct

The correct answer is B. प्रारंभिक भिन्नताओं को समूहों में लगभग समान रूप से बांटना / Distribute initial differences approximately evenly between groups. Random assignment reduces bias from hidden initial differences. Associate it with fair group formation in exams.

Step 3

Exam Tip

यादृच्छिक आवंटन छिपी हुई प्रारंभिक भिन्नताओं के पक्षपात को कम करता है। परीक्षा में इसे निष्पक्ष समूह निर्माण से जोड़ें।

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