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Science Scientific questions and observations MCQ Questions for Class 9

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Scientific questions and observations Practice Questions

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सही अवलोकन के लिए पैमाना कैसे पढ़ना चाहिए?

How should a scale be read for a correct observation?

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Correct Answer

C. आँख को निशान के स्तर पर रखकरWith the eye level with the mark

Step 1

Concept

Keeping the eye level with the scale reduces reading error. In exams remember the correct viewing angle.

Step 2

Why this answer is correct

The correct answer is C. आँख को निशान के स्तर पर रखकर / With the eye level with the mark. Keeping the eye level with the scale reduces reading error. In exams remember the correct viewing angle.

Step 3

Exam Tip

आँख को पैमाने के स्तर पर रखने से गलत पढ़ने की संभावना कम होती है। परीक्षा में सही दृष्टि कोण याद रखें।

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वैज्ञानिक प्रश्न का उत्तर किस पर आधारित होना चाहिए?

What should the answer to a scientific question be based on?

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Correct Answer

D. प्रमाणEvidence

Step 1

Concept

A scientific answer is based on evidence from observation and experiment. In exams choose the evidence-based option.

Step 2

Why this answer is correct

The correct answer is D. प्रमाण / Evidence. A scientific answer is based on evidence from observation and experiment. In exams choose the evidence-based option.

Step 3

Exam Tip

वैज्ञानिक उत्तर अवलोकन और प्रयोग से प्राप्त प्रमाण पर आधारित होता है। परीक्षा में प्रमाण आधारित विकल्प चुनें।

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एक ही माप कई बार लेने से क्या लाभ होता है?

What is the benefit of taking the same measurement several times?

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Correct Answer

A. परिणाम अधिक विश्वसनीय होता हैThe result becomes more reliable

Step 1

Concept

Taking several measurements reduces the effect of error and improves reliability. In exams remember the importance of repetition.

Step 2

Why this answer is correct

The correct answer is A. परिणाम अधिक विश्वसनीय होता है / The result becomes more reliable. Taking several measurements reduces the effect of error and improves reliability. In exams remember the importance of repetition.

Step 3

Exam Tip

कई माप लेने से गलती का प्रभाव कम होता है और विश्वसनीयता बढ़ती है। परीक्षा में पुनरावृत्ति का महत्व याद रखें।

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पत्ती की बनावट का अवलोकन करने के लिए कौन सी इंद्रिय उपयोगी है?

Which sense is useful for observing the texture of a leaf?

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Correct Answer

B. स्पर्शTouch

Step 1

Concept

Touch can be used to feel whether a leaf is smooth or rough. In exams match the sense with the property.

Step 2

Why this answer is correct

The correct answer is B. स्पर्श / Touch. Touch can be used to feel whether a leaf is smooth or rough. In exams match the sense with the property.

Step 3

Exam Tip

स्पर्श से पत्ती की चिकनाई या खुरदरापन महसूस किया जा सकता है। परीक्षा में इंद्रिय और गुण का मेल करें।

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ध्वनि का अवलोकन करने के लिए कौन सी इंद्रिय उपयोगी है?

Which sense is useful for observing sound?

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Correct Answer

C. श्रवणHearing

Step 1

Concept

Sound is heard with the ears so the sense of hearing is useful. In exams choose the correct sense.

Step 2

Why this answer is correct

The correct answer is C. श्रवण / Hearing. Sound is heard with the ears so the sense of hearing is useful. In exams choose the correct sense.

Step 3

Exam Tip

ध्वनि को कानों से सुना जाता है इसलिए श्रवण इंद्रिय उपयोगी है। परीक्षा में सही इंद्रिय चुनें।

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फूल की गंध का अवलोकन किस इंद्रिय से किया जाता है?

Which sense is used to observe the smell of a flower?

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Correct Answer

D. घ्राणSmell

Step 1

Concept

The smell of a flower is sensed with the nose. In exams connect smell with the olfactory sense.

Step 2

Why this answer is correct

The correct answer is D. घ्राण / Smell. The smell of a flower is sensed with the nose. In exams connect smell with the olfactory sense.

Step 3

Exam Tip

फूल की गंध नाक से महसूस की जाती है। परीक्षा में घ्राण इंद्रिय को गंध से जोड़ें।

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कौन सा अवलोकन रंग से संबंधित है?

Which observation is related to colour?

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Correct Answer

A. विलयन नीला हैThe solution is blue

Step 1

Concept

The word blue describes the colour of the solution. In exams identify qualitative observations.

Step 2

Why this answer is correct

The correct answer is A. विलयन नीला है / The solution is blue. The word blue describes the colour of the solution. In exams identify qualitative observations.

Step 3

Exam Tip

नीला शब्द विलयन के रंग का वर्णन करता है। परीक्षा में गुणात्मक अवलोकन पहचानें।

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वैज्ञानिक अवलोकन में तारीख लिखने का क्या लाभ है?

What is the benefit of writing the date in a scientific observation?

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Correct Answer

B. अवलोकन का समय पता रहता हैThe time of observation remains known

Step 1

Concept

The date shows when the observation was made. In exams keep records complete.

Step 2

Why this answer is correct

The correct answer is B. अवलोकन का समय पता रहता है / The time of observation remains known. The date shows when the observation was made. In exams keep records complete.

Step 3

Exam Tip

तारीख से पता चलता है कि अवलोकन कब किया गया था। परीक्षा में अभिलेख पूर्ण रखें।

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किस प्रश्न में जल की मात्रा बदली जा रही है?

In which question is the amount of water being changed?

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Correct Answer

C. क्या जल की अलग मात्रा पौधे की वृद्धि को प्रभावित करती है?Do different amounts of water affect plant growth?

Step 1

Concept

In this question the amount of water is changed and plant growth can be measured. In exams identify the independent variable.

Step 2

Why this answer is correct

The correct answer is C. क्या जल की अलग मात्रा पौधे की वृद्धि को प्रभावित करती है? / Do different amounts of water affect plant growth?. In this question the amount of water is changed and plant growth can be measured. In exams identify the independent variable.

Step 3

Exam Tip

इस प्रश्न में जल की मात्रा बदलकर पौधे की वृद्धि मापी जा सकती है। परीक्षा में स्वतंत्र चर पहचानें।

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वैज्ञानिक निष्कर्ष किसके बाद निकाला जाता है?

After what is a scientific conclusion drawn?

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Correct Answer

D. अवलोकन और आँकड़ों का अध्ययन करने के बादAfter studying observations and data

Step 1

Concept

A conclusion is drawn from the evidence and data obtained. In exams connect conclusions with evidence.

Step 2

Why this answer is correct

The correct answer is D. अवलोकन और आँकड़ों का अध्ययन करने के बाद / After studying observations and data. A conclusion is drawn from the evidence and data obtained. In exams connect conclusions with evidence.

Step 3

Exam Tip

निष्कर्ष प्राप्त प्रमाण और आँकड़ों के आधार पर निकाला जाता है। परीक्षा में निष्कर्ष को प्रमाण से जोड़ें।

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