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Science Nature and meaning of science MCQ Questions for Class 9

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किसी पदार्थ के रंग में परिवर्तन देखकर विद्यार्थी क्या कर रहा है?

What is a student doing by noticing a change in the colour of a substance?

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Correct Answer

C. अवलोकन कर रहा हैMaking an observation

Step 1

Concept

Noticing a colour change is a direct observation. What is directly noticed is an observation.

Step 2

Why this answer is correct

The correct answer is C. अवलोकन कर रहा है / Making an observation. Noticing a colour change is a direct observation. What is directly noticed is an observation.

Step 3

Exam Tip

रंग में परिवर्तन देखना एक प्रत्यक्ष अवलोकन है। जो देखा जाए उसे अवलोकन कहते हैं।

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यदि किसी द्रव का तापमान दर्ज न किया जाए तो जांच में क्या कमी रहेगी?

What limitation remains in an investigation if the temperature of a liquid is not recorded?

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Correct Answer

D. महत्वपूर्ण मापन का अभाव रहेगाAn important measurement will be missing

Step 1

Concept

Not recording temperature leaves out important quantitative information. Always record essential measurements.

Step 2

Why this answer is correct

The correct answer is D. महत्वपूर्ण मापन का अभाव रहेगा / An important measurement will be missing. Not recording temperature leaves out important quantitative information. Always record essential measurements.

Step 3

Exam Tip

तापमान न लिखने से आवश्यक मात्रात्मक जानकारी गायब रहती है। महत्वपूर्ण मापन हमेशा दर्ज करें।

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विज्ञान में किसी घटना के लिए संभावित कारण बताना क्या कहलाता है?

What is it called when a possible cause is suggested for a phenomenon in science?

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A. व्याख्याExplanation

Step 1

Concept

A possible cause of a phenomenon is called an explanation. An explanation should be supported by evidence.

Step 2

Why this answer is correct

The correct answer is A. व्याख्या / Explanation. A possible cause of a phenomenon is called an explanation. An explanation should be supported by evidence.

Step 3

Exam Tip

किसी घटना के संभावित कारण को व्याख्या कहा जाता है। व्याख्या प्रमाणों से समर्थित होनी चाहिए।

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विज्ञान के अध्ययन में प्रश्नों का उत्तर केवल पुस्तक से लेने की क्या सीमा है?

What is a limitation of taking answers only from a book while studying science?

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B. प्रत्यक्ष जांच और अनुभव का अवसर कम हो जाता हैThe opportunity for direct investigation and experience is reduced

Step 1

Concept

Science is also understood through experiments and observations. Reading alone is not sufficient.

Step 2

Why this answer is correct

The correct answer is B. प्रत्यक्ष जांच और अनुभव का अवसर कम हो जाता है / The opportunity for direct investigation and experience is reduced. Science is also understood through experiments and observations. Reading alone is not sufficient.

Step 3

Exam Tip

विज्ञान को प्रयोग और अवलोकन से भी समझा जाता है। केवल पढ़ना पर्याप्त नहीं है।

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एक विद्यार्थी ने पौधे को प्रतिदिन समान समय पर मापा। इससे क्या लाभ हुआ?

A student measured a plant at the same time every day. What was the benefit?

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C. मापन की परिस्थितियां अधिक समान रहींMeasurement conditions remained more similar

Step 1

Concept

Measuring at the same time keeps conditions more consistent. This makes comparison more valid.

Step 2

Why this answer is correct

The correct answer is C. मापन की परिस्थितियां अधिक समान रहीं / Measurement conditions remained more similar. Measuring at the same time keeps conditions more consistent. This makes comparison more valid.

Step 3

Exam Tip

समान समय पर मापन करने से परिस्थितियों में एकरूपता रहती है। इससे तुलना अधिक उचित होती है।

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यदि वैज्ञानिक अपने निष्कर्ष के विपरीत प्रमाण पाए तो क्या करना चाहिए?

What should scientists do if they find evidence against their conclusion?

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Correct Answer

D. निष्कर्ष पर पुनर्विचार करना चाहिएReconsider the conclusion

Step 1

Concept

A conclusion should be reconsidered when contrary evidence appears. Scientific ideas change according to evidence.

Step 2

Why this answer is correct

The correct answer is D. निष्कर्ष पर पुनर्विचार करना चाहिए / Reconsider the conclusion. A conclusion should be reconsidered when contrary evidence appears. Scientific ideas change according to evidence.

Step 3

Exam Tip

विपरीत प्रमाण मिलने पर निष्कर्ष की दोबारा जांच करनी चाहिए। विज्ञान में विचार प्रमाणों के अनुसार बदलते हैं।

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वैज्ञानिक जांच में निष्पक्ष तुलना के लिए क्या आवश्यक है?

What is necessary for a fair comparison in a scientific investigation?

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A. अधिकांश स्थितियों को समान रखनाKeeping most conditions the same

Step 1

Concept

For a fair comparison conditions other than the tested factor are kept the same. This is a controlled test.

Step 2

Why this answer is correct

The correct answer is A. अधिकांश स्थितियों को समान रखना / Keeping most conditions the same. For a fair comparison conditions other than the tested factor are kept the same. This is a controlled test.

Step 3

Exam Tip

निष्पक्ष तुलना के लिए जांचे जा रहे कारक के अलावा अन्य स्थितियां समान रखी जाती हैं। इसे नियंत्रित परीक्षण कहते हैं।

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विज्ञान में किसी विचार को अस्थायी रूप से स्वीकार करने का क्या अर्थ है?

What does it mean to accept an idea provisionally in science?

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B. उसे वर्तमान प्रमाणों के आधार पर स्वीकार किया गया हैIt is accepted on the basis of current evidence

Step 1

Concept

Scientific ideas are accepted on current evidence and may change with new evidence. Remember the term provisional.

Step 2

Why this answer is correct

The correct answer is B. उसे वर्तमान प्रमाणों के आधार पर स्वीकार किया गया है / It is accepted on the basis of current evidence. Scientific ideas are accepted on current evidence and may change with new evidence. Remember the term provisional.

Step 3

Exam Tip

वैज्ञानिक विचार वर्तमान प्रमाणों के आधार पर स्वीकार किए जाते हैं और नए प्रमाण पर बदल सकते हैं। अस्थायी शब्द याद रखें।

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वैज्ञानिक खोज में कल्पना की उपयोगी भूमिका क्या हो सकती है?

What can be a useful role of imagination in scientific discovery?

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Correct Answer

C. नई परिकल्पना या मॉडल सुझानाSuggest a new hypothesis or model

Step 1

Concept

Imagination can suggest new ideas and models but they must be tested with evidence. Understand the difference between imagination and evidence.

Step 2

Why this answer is correct

The correct answer is C. नई परिकल्पना या मॉडल सुझाना / Suggest a new hypothesis or model. Imagination can suggest new ideas and models but they must be tested with evidence. Understand the difference between imagination and evidence.

Step 3

Exam Tip

कल्पना नए विचार और मॉडल सुझा सकती है लेकिन उन्हें प्रमाण से जांचना होता है। कल्पना और प्रमाण का अंतर समझें।

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यदि किसी प्रयोग में एक साथ कई कारक बदल दिए जाएं तो क्या कठिनाई होगी?

What difficulty arises if several factors are changed at the same time in an experiment?

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D. परिणाम का सही कारण पहचानना कठिन होगाIt will be difficult to identify the true cause of the result

Step 1

Concept

Changing several factors makes it difficult to know which caused the effect. Change one factor at a time.

Step 2

Why this answer is correct

The correct answer is D. परिणाम का सही कारण पहचानना कठिन होगा / It will be difficult to identify the true cause of the result. Changing several factors makes it difficult to know which caused the effect. Change one factor at a time.

Step 3

Exam Tip

कई कारक बदलने से यह पता लगाना कठिन होता है कि प्रभाव किस कारण से हुआ। एक समय में एक कारक बदलें।

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