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Science Nature and meaning of science MCQ Questions for Class 9

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वैज्ञानिक जांच में किसी समस्या को स्पष्ट रूप से लिखने का क्या लाभ है?

What is the benefit of stating a problem clearly in a scientific investigation?

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Correct Answer

A. उचित जांच की योजना बनती हैIt helps plan a suitable investigation

Step 1

Concept

A clear problem makes it easier to choose the right question and method. Distinguish the problem from the conclusion in exams.

Step 2

Why this answer is correct

The correct answer is A. उचित जांच की योजना बनती है / It helps plan a suitable investigation. A clear problem makes it easier to choose the right question and method. Distinguish the problem from the conclusion in exams.

Step 3

Exam Tip

स्पष्ट समस्या से सही प्रश्न और जांच विधि चुनना आसान होता है। परीक्षा में समस्या और निष्कर्ष को अलग पहचानें।

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किसी पौधे की वृद्धि का अध्ययन करते समय नियमित मापन क्यों उपयोगी है?

Why is regular measurement useful while studying plant growth?

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Correct Answer

B. यह समय के साथ परिवर्तन दिखाता हैIt shows change over time

Step 1

Concept

Regular measurement clearly shows changes in growth. Remember the link between time and measurement.

Step 2

Why this answer is correct

The correct answer is B. यह समय के साथ परिवर्तन दिखाता है / It shows change over time. Regular measurement clearly shows changes in growth. Remember the link between time and measurement.

Step 3

Exam Tip

नियमित मापन से वृद्धि में होने वाला परिवर्तन स्पष्ट दिखाई देता है। समय और मापन के संबंध को याद रखें।

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यदि दो विद्यार्थियों को एक ही प्रयोग में अलग परिणाम मिलें तो पहला उचित कदम क्या है?

If two students obtain different results in the same experiment what should be the first suitable step?

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Correct Answer

C. विधि और मापन की जांच करनाCheck the method and measurements

Step 1

Concept

When results differ the method and measurements should be checked. Compare evidence before identifying an error.

Step 2

Why this answer is correct

The correct answer is C. विधि और मापन की जांच करना / Check the method and measurements. When results differ the method and measurements should be checked. Compare evidence before identifying an error.

Step 3

Exam Tip

अलग परिणाम मिलने पर विधि और मापन की जांच करनी चाहिए। त्रुटि खोजने से पहले प्रमाणों की तुलना करें।

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किस स्थिति में वैज्ञानिक दावा अधिक विश्वसनीय माना जाएगा?

In which situation is a scientific claim considered more reliable?

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Correct Answer

D. जब कई प्रमाण उसका समर्थन करेंWhen several pieces of evidence support it

Step 1

Concept

Several independent pieces of evidence increase the reliability of a scientific claim. Do not treat popularity as evidence.

Step 2

Why this answer is correct

The correct answer is D. जब कई प्रमाण उसका समर्थन करें / When several pieces of evidence support it. Several independent pieces of evidence increase the reliability of a scientific claim. Do not treat popularity as evidence.

Step 3

Exam Tip

कई स्वतंत्र प्रमाण किसी वैज्ञानिक दावे की विश्वसनीयता बढ़ाते हैं। लोकप्रियता को प्रमाण न मानें।

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वैज्ञानिक जांच में नियंत्रण समूह का सामान्य उद्देश्य क्या होता है?

What is the general purpose of a control group in a scientific investigation?

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Correct Answer

A. तुलना के लिए आधार देनाTo provide a basis for comparison

Step 1

Concept

A control group provides a basis for comparison with the experimental group. Identify it in comparison-based questions.

Step 2

Why this answer is correct

The correct answer is A. तुलना के लिए आधार देना / To provide a basis for comparison. A control group provides a basis for comparison with the experimental group. Identify it in comparison-based questions.

Step 3

Exam Tip

नियंत्रण समूह प्रयोगात्मक समूह से तुलना करने का आधार देता है। तुलना वाले प्रश्नों में इसे पहचानें।

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वैज्ञानिक अवलोकन लिखते समय कौन सा वाक्य सबसे उपयुक्त है?

Which sentence is most suitable while recording a scientific observation?

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Correct Answer

B. द्रव का रंग नीला हैThe liquid is blue

Step 1

Concept

An observation records directly noticed properties. Distinguish opinion from observation.

Step 2

Why this answer is correct

The correct answer is B. द्रव का रंग नीला है / The liquid is blue. An observation records directly noticed properties. Distinguish opinion from observation.

Step 3

Exam Tip

अवलोकन में सीधे दिखाई देने वाले गुण लिखे जाते हैं। राय और अवलोकन में अंतर रखें।

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निम्न में से कौन वैज्ञानिक अनुमान का अच्छा उदाहरण है?

Which of the following is a good example of a scientific inference?

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Correct Answer

C. गीली सड़क देखकर अनुमान लगाना कि वर्षा हुई होगीInferring from a wet road that it may have rained

Step 1

Concept

A scientific inference is a possible explanation drawn from an observation. Do not confuse inference with direct observation.

Step 2

Why this answer is correct

The correct answer is C. गीली सड़क देखकर अनुमान लगाना कि वर्षा हुई होगी / Inferring from a wet road that it may have rained. A scientific inference is a possible explanation drawn from an observation. Do not confuse inference with direct observation.

Step 3

Exam Tip

वैज्ञानिक अनुमान अवलोकन से निकाली गई संभावित व्याख्या होता है। अनुमान को प्रत्यक्ष अवलोकन न समझें।

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यदि कोई विद्यार्थी केवल अपनी पसंद के परिणाम लिखे तो कौन सा वैज्ञानिक गुण प्रभावित होगा?

Which scientific quality is affected if a student records only preferred results?

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Correct Answer

D. निष्पक्षताObjectivity

Step 1

Concept

Recording only preferred results violates objectivity. Record all results honestly.

Step 2

Why this answer is correct

The correct answer is D. निष्पक्षता / Objectivity. Recording only preferred results violates objectivity. Record all results honestly.

Step 3

Exam Tip

केवल पसंदीदा परिणाम लिखना निष्पक्षता के विरुद्ध है। सभी परिणाम ईमानदारी से दर्ज करें।

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विज्ञान में वस्तुनिष्ठता का क्या अर्थ है?

What does objectivity mean in science?

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Correct Answer

A. व्यक्तिगत पसंद से ऊपर प्रमाण को रखनाGiving priority to evidence over personal preference

Step 1

Concept

Objectivity means making decisions on the basis of evidence. Keep personal preference away from conclusions.

Step 2

Why this answer is correct

The correct answer is A. व्यक्तिगत पसंद से ऊपर प्रमाण को रखना / Giving priority to evidence over personal preference. Objectivity means making decisions on the basis of evidence. Keep personal preference away from conclusions.

Step 3

Exam Tip

वस्तुनिष्ठता में निर्णय प्रमाणों के आधार पर किया जाता है। व्यक्तिगत पसंद को निष्कर्ष से दूर रखें।

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एक वैज्ञानिक तालिका में इकाई लिखना क्यों जरूरी है?

Why is it necessary to write units in a scientific table?

Explanation opens after your attempt
Correct Answer

B. मापन का सही अर्थ स्पष्ट करने के लिएTo clarify the meaning of measurements

Step 1

Concept

A unit tells the standard in which a quantity was measured. Always check the unit with a number.

Step 2

Why this answer is correct

The correct answer is B. मापन का सही अर्थ स्पष्ट करने के लिए / To clarify the meaning of measurements. A unit tells the standard in which a quantity was measured. Always check the unit with a number.

Step 3

Exam Tip

इकाई बताती है कि मात्रा किस मानक में मापी गई है। संख्या के साथ इकाई अवश्य देखें।

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