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control group contamination MCQ Questions for Class 9

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2 questions tagged with control group contamination.

Question 1/2 Expert Science Exploration: Entering the World of Secondary Science Nature and meaning of science Class 9 Level 1

किस स्थिति में प्रयोग का नियंत्रण समूह परिणाम की व्याख्या में सबसे कम उपयोगी होगा?

In which situation would a control group be least useful for interpreting an experiment?

Explanation opens after your attempt
Correct Answer

B. जब नियंत्रण समूह को भी अनजाने में उपचार मिल जाएWhen the control group accidentally receives the treatment

Step 1

Concept

If the control group receives the treatment the comparison baseline becomes contaminated. Check the integrity of the control group.

Step 2

Why this answer is correct

The correct answer is B. जब नियंत्रण समूह को भी अनजाने में उपचार मिल जाए / When the control group accidentally receives the treatment. If the control group receives the treatment the comparison baseline becomes contaminated. Check the integrity of the control group.

Step 3

Exam Tip

नियंत्रण समूह को उपचार मिलने पर तुलना का आधार दूषित हो जाता है। परीक्षा में नियंत्रण समूह की स्वतंत्रता जाँचें।

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Question 2/2 Hard Science Exploration: Entering the World of Secondary Science Nature and meaning of science Class 9 Level 2

एक प्रयोग में नियंत्रण समूह को भी अनजाने में उपचार का कुछ भाग मिल गया। इससे क्या प्रभाव पड़ेगा?

In an experiment the control group accidentally received part of the treatment. What effect may this have?

Explanation opens after your attempt
Correct Answer

A. समूहों के अंतर की स्पष्टता घटेगीThe distinction between groups will become less clear

Step 1

Concept

Contamination of the control group weakens comparison of the true treatment effect. Check clear separation of groups.

Step 2

Why this answer is correct

The correct answer is A. समूहों के अंतर की स्पष्टता घटेगी / The distinction between groups will become less clear. Contamination of the control group weakens comparison of the true treatment effect. Check clear separation of groups.

Step 3

Exam Tip

नियंत्रण समूह दूषित होने से उपचार के वास्तविक प्रभाव की तुलना कमजोर होती है। परीक्षा में समूहों की स्पष्ट अलगाव जाँचें।

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