Concept-wise Practice

before after study MCQ Questions for Class 9

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

Practice Questions

1 questions tagged with before after study.

एक वैज्ञानिक निष्कर्ष केवल इस आधार पर दिया गया कि उपचार के बाद सुधार हुआ। कौन सी अतिरिक्त तुलना सबसे आवश्यक है?

A scientific conclusion was based only on improvement after treatment. Which additional comparison is most necessary?

Explanation opens after your attempt
Correct Answer

A. बिना उपचार वाले समान समूह से तुलनाComparison with a similar untreated group

Step 1

Concept

A comparison group is needed to separate natural change over time from treatment effects. Before-and-after comparison alone may be insufficient.

Step 2

Why this answer is correct

The correct answer is A. बिना उपचार वाले समान समूह से तुलना / Comparison with a similar untreated group. A comparison group is needed to separate natural change over time from treatment effects. Before-and-after comparison alone may be insufficient.

Step 3

Exam Tip

समय के साथ प्राकृतिक परिवर्तन को उपचार प्रभाव से अलग करने के लिए तुलना समूह चाहिए। परीक्षा में पूर्व और पश्चात तुलना अकेली पर्याप्त न मानें।

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