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Science Variables in an experiment MCQ Questions for Class 9

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Variables in an experiment Practice Questions

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कौन से चर प्रयोग में जानबूझकर नहीं बदले जाते?

Which variables are not deliberately changed in an experiment?

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Correct Answer

B. नियंत्रित चरControlled variables

Step 1

Concept

Controlled variables are deliberately kept the same. This makes the experiment fair.

Step 2

Why this answer is correct

The correct answer is B. नियंत्रित चर / Controlled variables. Controlled variables are deliberately kept the same. This makes the experiment fair.

Step 3

Exam Tip

नियंत्रित चर जानबूझकर समान रखे जाते हैं। इससे प्रयोग निष्पक्ष होता है।

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एक छात्र मिट्टी के प्रकार का पौधे की वृद्धि पर प्रभाव जांचता है। स्वतंत्र चर कौन सा है?

A student tests the effect of soil type on plant growth. What is the independent variable?

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Correct Answer

C. मिट्टी का प्रकारType of soil

Step 1

Concept

The type of soil is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is C. मिट्टी का प्रकार / Type of soil. The type of soil is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

मिट्टी का प्रकार जानबूझकर बदला जाता है। इसलिए यह स्वतंत्र चर है।

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उसी प्रयोग में पानी की मात्रा कैसी रखी जानी चाहिए?

In the same experiment how should the amount of water be kept?

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Correct Answer

D. समानThe same

Step 1

Concept

The amount of water should be kept the same so that the effect of soil type remains clear.

Step 2

Why this answer is correct

The correct answer is D. समान / The same. The amount of water should be kept the same so that the effect of soil type remains clear.

Step 3

Exam Tip

पानी की मात्रा समान रखनी चाहिए ताकि मिट्टी के प्रकार का प्रभाव स्पष्ट रहे।

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किस प्रयोग में स्वतंत्र चर हिलाने की गति है?

In which experiment is stirring speed the independent variable?

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Correct Answer

A. अलग गति से हिलाकर चीनी के घुलने का समय मापनाMeasuring sugar dissolving time at different stirring speeds

Step 1

Concept

In this experiment stirring speed is changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is A. अलग गति से हिलाकर चीनी के घुलने का समय मापना / Measuring sugar dissolving time at different stirring speeds. In this experiment stirring speed is changed. Therefore it is the independent variable.

Step 3

Exam Tip

इस प्रयोग में हिलाने की गति बदली जाती है। इसलिए यह स्वतंत्र चर है।

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हिलाने की गति वाले प्रयोग में पानी का तापमान क्या होना चाहिए?

What should the water temperature be in an experiment on stirring speed?

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Correct Answer

B. हर बार समानThe same every time

Step 1

Concept

Keeping water temperature the same allows only the effect of stirring speed to be observed.

Step 2

Why this answer is correct

The correct answer is B. हर बार समान / The same every time. Keeping water temperature the same allows only the effect of stirring speed to be observed.

Step 3

Exam Tip

पानी का तापमान समान रखने से केवल हिलाने की गति का प्रभाव देखा जाएगा।

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एक प्रयोग में ध्वनि की तीव्रता बदली जाती है और पौधे की वृद्धि मापी जाती है। आश्रित चर कौन सा है?

In an experiment sound intensity is changed and plant growth is measured. What is the dependent variable?

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Correct Answer

C. पौधे की वृद्धिPlant growth

Step 1

Concept

Plant growth is the measured outcome. Therefore it is the dependent variable.

Step 2

Why this answer is correct

The correct answer is C. पौधे की वृद्धि / Plant growth. Plant growth is the measured outcome. Therefore it is the dependent variable.

Step 3

Exam Tip

पौधे की वृद्धि मापा जाने वाला परिणाम है। इसलिए यह आश्रित चर है।

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उसी प्रयोग में ध्वनि की तीव्रता कौन सा चर है?

In the same experiment what type of variable is sound intensity?

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Correct Answer

D. स्वतंत्र चरIndependent variable

Step 1

Concept

Sound intensity is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is D. स्वतंत्र चर / Independent variable. Sound intensity is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

ध्वनि की तीव्रता जानबूझकर बदली जाती है। इसलिए यह स्वतंत्र चर है।

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किस स्थिति में प्रयोग निष्पक्ष माना जाएगा?

In which situation is an experiment considered fair?

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Correct Answer

A. एक चर बदले और बाकी संबंधित चर समान रहेंOne variable changes and other relevant variables remain the same

Step 1

Concept

Changing one main variable and keeping other relevant variables constant allows a fair comparison.

Step 2

Why this answer is correct

The correct answer is A. एक चर बदले और बाकी संबंधित चर समान रहें / One variable changes and other relevant variables remain the same. Changing one main variable and keeping other relevant variables constant allows a fair comparison.

Step 3

Exam Tip

एक मुख्य चर बदलने और बाकी संबंधित चर समान रखने से निष्पक्ष तुलना होती है।

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प्रयोग में चर लिखने से क्या लाभ होता है?

What is the benefit of identifying variables in an experiment?

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Correct Answer

B. जांच की योजना स्पष्ट होती हैThe investigation plan becomes clear

Step 1

Concept

Identifying variables shows what to change what to measure and what to keep the same.

Step 2

Why this answer is correct

The correct answer is B. जांच की योजना स्पष्ट होती है / The investigation plan becomes clear. Identifying variables shows what to change what to measure and what to keep the same.

Step 3

Exam Tip

चर पहचानने से पता चलता है कि क्या बदलना है क्या मापना है और क्या समान रखना है।

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किस विकल्प में चर का सही मेल है?

Which option correctly matches a variable with its role?

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Correct Answer

C. बदला गया तापमान स्वतंत्र चरChanged temperature as independent variable

Step 1

Concept

A deliberately changed temperature is an independent variable. Identify whether a factor is changed measured or kept the same.

Step 2

Why this answer is correct

The correct answer is C. बदला गया तापमान स्वतंत्र चर / Changed temperature as independent variable. A deliberately changed temperature is an independent variable. Identify whether a factor is changed measured or kept the same.

Step 3

Exam Tip

जानबूझकर बदला गया तापमान स्वतंत्र चर है। भूमिका पहचानते समय बदला मापा और समान रखा गया कारक देखें।

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