Concept-wise Practice

experimental design MCQ Questions for Class 9

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

Practice Questions

31 questions tagged with experimental design.

एक प्रयोग में उपचार समूह को नई शिक्षण विधि और अतिरिक्त अध्ययन समय दोनों मिले जबकि नियंत्रण समूह को दोनों नहीं मिले। परिणाम की व्याख्या में मुख्य बाधा क्या है?

In an experiment the treatment group received both a new teaching method and extra study time while the control group received neither. What is the main obstacle to interpretation?

Explanation opens after your attempt
Correct Answer

B. यह तय नहीं किया जा सकता कि प्रभाव किस परिवर्तन से हुआIt cannot be determined which change caused the effect

Step 1

Concept

Changing two factors together prevents their separate effects from being identified. Remember to isolate the main variable.

Step 2

Why this answer is correct

The correct answer is B. यह तय नहीं किया जा सकता कि प्रभाव किस परिवर्तन से हुआ / It cannot be determined which change caused the effect. Changing two factors together prevents their separate effects from being identified. Remember to isolate the main variable.

Step 3

Exam Tip

दो कारकों को साथ बदलने से उनके अलग प्रभाव पहचाने नहीं जा सकते। परीक्षा में एक समय में एक प्रमुख चर बदलने का सिद्धांत याद रखें।

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