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Science Hypothesis and experimentation MCQ Questions for Class 9

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एक अच्छी परिकल्पना की मुख्य विशेषता क्या है?

What is the main feature of a good hypothesis?

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Correct Answer

B. उसकी जाँच की जा सकेIt can be tested

Step 1

Concept

A good hypothesis can be tested through experiment or observation. In exams identify testability.

Step 2

Why this answer is correct

The correct answer is B. उसकी जाँच की जा सके / It can be tested. A good hypothesis can be tested through experiment or observation. In exams identify testability.

Step 3

Exam Tip

अच्छी परिकल्पना को प्रयोग या अवलोकन से जाँचा जा सकता है। परीक्षा में परीक्षणयोग्यता पहचानें।

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इनमें से कौन सी परिकल्पना है?

Which of these is 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. In exams identify 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. In exams identify 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 कथन पहचानें।

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प्रयोग का मुख्य उद्देश्य क्या है?

What is the main purpose of an experiment?

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Correct Answer

D. परिकल्पना की जाँच करनाTo test a hypothesis

Step 1

Concept

An experiment provides evidence to support or reject a hypothesis. In exams connect experiments with testing.

Step 2

Why this answer is correct

The correct answer is D. परिकल्पना की जाँच करना / To test a hypothesis. An experiment provides evidence to support or reject a hypothesis. In exams connect experiments with testing.

Step 3

Exam Tip

प्रयोग से परिकल्पना के समर्थन या असमर्थन के लिए प्रमाण मिलता है। परीक्षा में प्रयोग को जाँच से जोड़ें।

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नियंत्रित चर का क्या कार्य है?

What is the role of a controlled variable?

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Correct Answer

D. अन्य परिस्थितियों को समान रखनाTo keep other conditions the same

Step 1

Concept

A controlled variable keeps other influencing conditions the same. In exams identify it for a fair comparison.

Step 2

Why this answer is correct

The correct answer is D. अन्य परिस्थितियों को समान रखना / To keep other conditions the same. A controlled variable keeps other influencing conditions the same. In exams identify it for a fair comparison.

Step 3

Exam Tip

नियंत्रित चर अन्य प्रभावकारी परिस्थितियों को समान रखता है। परीक्षा में निष्पक्ष तुलना के लिए इसे पहचानें।

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यदि छात्र जल की मात्रा बदलकर पौधे की ऊँचाई मापता है तो स्वतंत्र चर क्या है?

If a student changes the amount of water and measures plant height what is the independent variable?

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Correct Answer

A. जल की मात्राAmount of water

Step 1

Concept

The amount of water is deliberately changed so it is the independent variable. In exams choose the changed factor.

Step 2

Why this answer is correct

The correct answer is A. जल की मात्रा / Amount of water. The amount of water is deliberately changed so it is the independent variable. In exams choose the changed factor.

Step 3

Exam Tip

जल की मात्रा जानबूझकर बदली जाती है इसलिए यह स्वतंत्र चर है। परीक्षा में बदलने वाले कारक को चुनें।

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यदि छात्र जल की मात्रा बदलकर पौधे की ऊँचाई मापता है तो आश्रित चर क्या है?

If a student changes the amount of water and measures plant height what is the dependent variable?

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Correct Answer

B. पौधे की ऊँचाईPlant height

Step 1

Concept

Plant height is the measured outcome and therefore the dependent variable. In exams identify the result.

Step 2

Why this answer is correct

The correct answer is B. पौधे की ऊँचाई / Plant height. Plant height is the measured outcome and therefore the dependent variable. In exams identify the result.

Step 3

Exam Tip

पौधे की ऊँचाई मापा गया परिणाम है इसलिए यह आश्रित चर है। परीक्षा में परिणाम को पहचानें।

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यदि परिकल्पना है कि गर्म जल में चीनी जल्दी घुलेगी तो क्या मापना चाहिए?

If the hypothesis is that sugar will dissolve faster in hot water what should be measured?

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Correct Answer

C. घुलने में लगा समयTime taken to dissolve

Step 1

Concept

The time taken to dissolve measures the dissolving speed. In exams choose an outcome that matches the hypothesis.

Step 2

Why this answer is correct

The correct answer is C. घुलने में लगा समय / Time taken to dissolve. The time taken to dissolve measures the dissolving speed. In exams choose an outcome that matches the hypothesis.

Step 3

Exam Tip

घुलने में लगा समय घुलने की गति का माप देता है। परीक्षा में परिकल्पना के अनुसार परिणाम चुनें।

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प्रयोग शुरू करने से पहले सबसे पहले क्या करना चाहिए?

What should be done before starting an experiment?

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Correct Answer

D. प्रक्रिया और सुरक्षा नियम समझनाUnderstand the procedure and safety rules

Step 1

Concept

The procedure and safety rules must be understood before an experiment. In exams give priority to safe working.

Step 2

Why this answer is correct

The correct answer is D. प्रक्रिया और सुरक्षा नियम समझना / Understand the procedure and safety rules. The procedure and safety rules must be understood before an experiment. In exams give priority to safe working.

Step 3

Exam Tip

प्रयोग से पहले प्रक्रिया और सुरक्षा नियम समझना आवश्यक है। परीक्षा में सुरक्षित कार्य को प्राथमिकता दें।

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प्रयोग करते समय सुरक्षा चश्मा कब पहनना चाहिए?

When should safety goggles be worn during an experiment?

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Correct Answer

A. जब आँखों को छींटों से खतरा होWhen there is a risk of splashes to the eyes

Step 1

Concept

Safety goggles protect the eyes from harmful splashes. In exams choose safety equipment according to the risk.

Step 2

Why this answer is correct

The correct answer is A. जब आँखों को छींटों से खतरा हो / When there is a risk of splashes to the eyes. Safety goggles protect the eyes from harmful splashes. In exams choose safety equipment according to the risk.

Step 3

Exam Tip

हानिकारक छींटों से आँखों की रक्षा के लिए सुरक्षा चश्मा पहना जाता है। परीक्षा में जोखिम के अनुसार सुरक्षा साधन चुनें।

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किसी प्रयोग को दोहराने का मुख्य लाभ क्या है?

What is the main benefit of repeating an experiment?

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Correct Answer

B. परिणाम की विश्वसनीयता बढ़ानाTo increase reliability of results

Step 1

Concept

Repeating an experiment confirms the result and increases reliability. In exams connect repetition with reliability.

Step 2

Why this answer is correct

The correct answer is B. परिणाम की विश्वसनीयता बढ़ाना / To increase reliability of results. Repeating an experiment confirms the result and increases reliability. In exams connect repetition with reliability.

Step 3

Exam Tip

प्रयोग दोहराने से परिणाम की पुष्टि और विश्वसनीयता बढ़ती है। परीक्षा में पुनरावृत्ति को विश्वसनीयता से जोड़ें।

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