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Science Hypothesis and experimentation MCQ Questions for Class 9

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Hypothesis and experimentation Practice Questions

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प्रयोग में समान रखे जाने वाले कारकों को क्या कहते हैं?

What are the factors kept the same in an experiment called?

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Correct Answer

B. नियंत्रित चरControlled variables

Step 1

Concept

Controlled variables are kept constant to ensure a fair comparison. Identify fixed factors.

Step 2

Why this answer is correct

The correct answer is B. नियंत्रित चर / Controlled variables. Controlled variables are kept constant to ensure a fair comparison. Identify fixed factors.

Step 3

Exam Tip

नियंत्रित चर समान रखे जाते हैं ताकि निष्पक्ष तुलना हो सके। परीक्षा में स्थिर कारक पहचानें।

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कौन सा कथन एक परिकल्पना का उदाहरण है?

Which statement is an example of a hypothesis?

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Correct Answer

C. यदि पौधे को अधिक प्रकाश मिलेगा तो उसकी वृद्धि बढ़ेगीIf a plant receives more light then its growth will increase

Step 1

Concept

This statement gives a testable relationship between light and growth. Identify testable if-then statements.

Step 2

Why this answer is correct

The correct answer is C. यदि पौधे को अधिक प्रकाश मिलेगा तो उसकी वृद्धि बढ़ेगी / If a plant receives more light then its growth will increase. This statement gives a testable relationship between light and growth. Identify testable if-then statements.

Step 3

Exam Tip

यह कथन प्रकाश और वृद्धि के बीच जाँच योग्य संबंध बताता है। परीक्षा में यदि और तो वाले परीक्षण योग्य कथन पहचानें।

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निष्पक्ष प्रयोग के लिए क्या आवश्यक है?

What is necessary for a fair experiment?

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Correct Answer

D. एक मुख्य चर बदलना और अन्य कारक समान रखनाChange one main variable and keep other factors the same

Step 1

Concept

Changing one main variable allows its effect to be tested clearly. Remember the principle of a fair test.

Step 2

Why this answer is correct

The correct answer is D. एक मुख्य चर बदलना और अन्य कारक समान रखना / Change one main variable and keep other factors the same. Changing one main variable allows its effect to be tested clearly. Remember the principle of a fair test.

Step 3

Exam Tip

एक मुख्य चर बदलने से उसके प्रभाव की स्पष्ट जाँच होती है। परीक्षा में निष्पक्ष परीक्षण का सिद्धांत याद रखें।

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नियंत्रण समूह का उपयोग क्यों किया जाता है?

Why is a control group used?

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Correct Answer

A. तुलना के लिए आधार देने हेतुTo provide a basis for comparison

Step 1

Concept

A control group is compared with the treatment group. Treat it as the comparison baseline.

Step 2

Why this answer is correct

The correct answer is A. तुलना के लिए आधार देने हेतु / To provide a basis for comparison. A control group is compared with the treatment group. Treat it as the comparison baseline.

Step 3

Exam Tip

नियंत्रण समूह से उपचार वाले समूह की तुलना की जाती है। परीक्षा में इसे तुलना का आधार समझें।

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प्रयोग शुरू करने से पहले क्या लिखना उपयोगी है?

What is useful to write before starting an experiment?

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Correct Answer

B. परिकल्पना और विधिThe hypothesis and method

Step 1

Concept

Writing the hypothesis and method beforehand makes the investigation clear and organised. Understand the importance of planning.

Step 2

Why this answer is correct

The correct answer is B. परिकल्पना और विधि / The hypothesis and method. Writing the hypothesis and method beforehand makes the investigation clear and organised. Understand the importance of planning.

Step 3

Exam Tip

पहले से परिकल्पना और विधि लिखने से जाँच स्पष्ट और व्यवस्थित होती है। परीक्षा में योजना का महत्व समझें।

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एक प्रयोग में पौधों को अलग मात्रा में पानी दिया गया। स्वतंत्र चर क्या है?

In an experiment plants receive different amounts of water. What is the independent variable?

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Correct Answer

C. पानी की मात्राAmount of water

Step 1

Concept

The experimenter changes the amount of water so it is the independent variable. Identify the deliberately changed factor.

Step 2

Why this answer is correct

The correct answer is C. पानी की मात्रा / Amount of water. The experimenter changes the amount of water so it is the independent variable. Identify the deliberately changed factor.

Step 3

Exam Tip

प्रयोगकर्ता पानी की मात्रा बदल रहा है इसलिए यही स्वतंत्र चर है। परीक्षा में जानबूझकर बदला गया कारक पहचानें।

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यदि पौधे की ऊँचाई मापी जाती है तो वह कौन सा चर है?

If plant height is measured which type of variable is it?

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D. आश्रित चरDependent variable

Step 1

Concept

Plant height is the measured outcome of the experiment. Treat the outcome as the dependent variable.

Step 2

Why this answer is correct

The correct answer is D. आश्रित चर / Dependent variable. Plant height is the measured outcome of the experiment. Treat the outcome as the dependent variable.

Step 3

Exam Tip

पौधे की ऊँचाई प्रयोग का मापा गया परिणाम है। परीक्षा में परिणाम को आश्रित चर मानें।

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प्रयोग में डेटा दर्ज करना क्यों जरूरी है?

Why is it necessary to record data in an experiment?

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Correct Answer

A. ताकि निष्कर्ष प्रमाण पर आधारित होSo the conclusion is based on evidence

Step 1

Concept

Recorded data serve as evidence from the experiment. Link conclusions with data.

Step 2

Why this answer is correct

The correct answer is A. ताकि निष्कर्ष प्रमाण पर आधारित हो / So the conclusion is based on evidence. Recorded data serve as evidence from the experiment. Link conclusions with data.

Step 3

Exam Tip

दर्ज डेटा प्रयोग के प्रमाण का काम करता है। परीक्षा में निष्कर्ष को डेटा से जोड़ें।

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प्रयोग को दोहराने का एक लाभ क्या है?

What is one benefit of repeating an experiment?

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Correct Answer

B. परिणाम की विश्वसनीयता बढ़ती हैReliability of the result increases

Step 1

Concept

Repetition helps determine whether results are consistent. Link repetition with reliability.

Step 2

Why this answer is correct

The correct answer is B. परिणाम की विश्वसनीयता बढ़ती है / Reliability of the result increases. Repetition helps determine whether results are consistent. Link repetition with reliability.

Step 3

Exam Tip

दोहराव से देखा जा सकता है कि परिणाम संगत हैं या नहीं। परीक्षा में पुनरावृत्ति को विश्वसनीयता से जोड़ें।

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किसी प्रयोग की विधि में क्या लिखा जाता है?

What is written in the method of an experiment?

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Correct Answer

D. प्रयोग करने के चरणSteps for carrying out the experiment

Step 1

Concept

The method describes the sequence of steps used in the experiment. Identify the step-by-step procedure.

Step 2

Why this answer is correct

The correct answer is D. प्रयोग करने के चरण / Steps for carrying out the experiment. The method describes the sequence of steps used in the experiment. Identify the step-by-step procedure.

Step 3

Exam Tip

विधि बताती है कि प्रयोग किस क्रम में किया जाएगा। परीक्षा में चरणबद्ध प्रक्रिया पहचानें।

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