Class 9 Science - Exploration: Entering the World of Secondary Science - Variables in an experiment Easy Quiz

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निष्पक्ष प्रयोग में सामान्यतः कितने स्वतंत्र चर बदले जाते हैं?

How many independent variables are usually changed in a fair experiment?

Explanation opens after your attempt
Correct Answer

D. एकOne

Step 1

Concept

Usually only one independent variable is changed in a fair experiment. Other related factors are kept the same.

Step 2

Why this answer is correct

The correct answer is D. एक / One. Usually only one independent variable is changed in a fair experiment. Other related factors are kept the same.

Step 3

Exam Tip

निष्पक्ष प्रयोग में सामान्यतः केवल एक स्वतंत्र चर बदला जाता है। बाकी संबंधित कारक समान रखे जाते हैं।

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पौधे पर प्रकाश के प्रभाव की जांच में प्रकाश की मात्रा कौन सा चर है?

In an investigation of the effect of light on a plant what type of variable is the amount of light?

Explanation opens after your attempt
Correct Answer

A. स्वतंत्र चरIndependent variable

Step 1

Concept

The amount of light is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is A. स्वतंत्र चर / Independent variable. The amount of light is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

प्रकाश की मात्रा जानबूझकर बदली जाती है। इसलिए यह स्वतंत्र चर है।

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उसी प्रयोग में पौधे की ऊंचाई कौन सा चर है?

In the same experiment what type of variable is plant height?

Explanation opens after your attempt
Correct Answer

B. आश्रित चरDependent variable

Step 1

Concept

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

Step 2

Why this answer is correct

The correct answer is B. आश्रित चर / Dependent variable. Plant height is the measured outcome. Therefore it is the dependent variable.

Step 3

Exam Tip

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

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पौधे पर प्रकाश का प्रभाव जांचते समय पानी की मात्रा कैसी रखनी चाहिए?

How should the amount of water be kept while testing the effect of light on a plant?

Explanation opens after your attempt
Correct Answer

C. समान रखनी चाहिएIt should be kept the same

Step 1

Concept

Keeping water amount the same allows only the effect of light to be observed. Water is a controlled variable here.

Step 2

Why this answer is correct

The correct answer is C. समान रखनी चाहिए / It should be kept the same. Keeping water amount the same allows only the effect of light to be observed. Water is a controlled variable here.

Step 3

Exam Tip

पानी की मात्रा समान रखने से केवल प्रकाश का प्रभाव देखा जा सकता है। पानी यहां नियंत्रित चर है।

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यदि एक साथ कई कारक बदल जाएं तो क्या कठिनाई होगी?

What difficulty arises if several factors change at the same time?

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Correct Answer

D. परिणाम का वास्तविक कारण पता लगाना कठिन होगाIt will be difficult to identify the real cause of the result

Step 1

Concept

When several factors change it becomes unclear what caused the result. Change one main factor at a time.

Step 2

Why this answer is correct

The correct answer is D. परिणाम का वास्तविक कारण पता लगाना कठिन होगा / It will be difficult to identify the real cause of the result. When several factors change it becomes unclear what caused the result. Change one main factor at a time.

Step 3

Exam Tip

कई कारक बदलने पर यह पता नहीं चलता कि परिणाम किस कारण आया। एक समय में एक मुख्य कारक बदलें।

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गर्म पानी में चीनी के घुलने की जांच में पानी का तापमान कौन सा चर है?

In an investigation of sugar dissolving in hot water what type of variable is water temperature?

Explanation opens after your attempt
Correct Answer

A. स्वतंत्र चरIndependent variable

Step 1

Concept

Water temperature is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is A. स्वतंत्र चर / Independent variable. Water temperature is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

पानी का तापमान जानबूझकर बदला जाता है। इसलिए यह स्वतंत्र चर है।

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चीनी के घुलने में लगा समय कौन सा चर है?

What type of variable is the time taken for sugar to dissolve?

Explanation opens after your attempt
Correct Answer

B. आश्रित चरDependent variable

Step 1

Concept

The time taken to dissolve is the measured outcome. Therefore it is the dependent variable.

Step 2

Why this answer is correct

The correct answer is B. आश्रित चर / Dependent variable. The time taken to dissolve is the measured outcome. Therefore it is the dependent variable.

Step 3

Exam Tip

घुलने में लगा समय मापा गया परिणाम है। इसलिए यह आश्रित चर है।

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घुलने के प्रयोग में चीनी की मात्रा कैसी रखनी चाहिए?

How should the amount of sugar be kept in a dissolving experiment?

Explanation opens after your attempt
Correct Answer

C. हर परीक्षण में समानThe same in every trial

Step 1

Concept

Keeping the amount of sugar the same makes the effect of temperature clear. It is a controlled variable.

Step 2

Why this answer is correct

The correct answer is C. हर परीक्षण में समान / The same in every trial. Keeping the amount of sugar the same makes the effect of temperature clear. It is a controlled variable.

Step 3

Exam Tip

चीनी की मात्रा समान रखने से तापमान का प्रभाव स्पष्ट रहता है। यह नियंत्रित चर है।

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स्वतंत्र चर को पहचानने का सरल तरीका क्या है?

What is a simple way to identify the independent variable?

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Correct Answer

D. जिसे छात्र जानबूझकर बदलता हैThe factor the student deliberately changes

Step 1

Concept

The factor deliberately changed is the independent variable. Look for the changed factor in the question.

Step 2

Why this answer is correct

The correct answer is D. जिसे छात्र जानबूझकर बदलता है / The factor the student deliberately changes. The factor deliberately changed is the independent variable. Look for the changed factor in the question.

Step 3

Exam Tip

जिस कारक को जानबूझकर बदला जाता है वही स्वतंत्र चर होता है। प्रश्न में बदला गया कारक खोजें।

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आश्रित चर को पहचानने का सरल तरीका क्या है?

What is a simple way to identify the dependent variable?

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Correct Answer

A. जिसे मापा या देखा जाता हैThe factor that is measured or observed

Step 1

Concept

The measured or observed outcome is the dependent variable. It may change because of the independent variable.

Step 2

Why this answer is correct

The correct answer is A. जिसे मापा या देखा जाता है / The factor that is measured or observed. The measured or observed outcome is the dependent variable. It may change because of the independent variable.

Step 3

Exam Tip

मापा या देखा गया परिणाम आश्रित चर होता है। यह स्वतंत्र चर के कारण बदल सकता है।

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नियंत्रित चर का मुख्य उद्देश्य क्या है?

What is the main purpose of a controlled variable?

Explanation opens after your attempt
Correct Answer

B. प्रयोग को निष्पक्ष बनानाTo make the experiment fair

Step 1

Concept

Controlled variables are kept the same so that only the effect of the independent variable is observed.

Step 2

Why this answer is correct

The correct answer is B. प्रयोग को निष्पक्ष बनाना / To make the experiment fair. Controlled variables are kept the same so that only the effect of the independent variable is observed.

Step 3

Exam Tip

नियंत्रित चर समान रखे जाते हैं ताकि केवल स्वतंत्र चर का प्रभाव देखा जाए।

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पानी की मात्रा का बीज अंकुरण पर प्रभाव जांचते समय स्वतंत्र चर कौन सा है?

What is the independent variable while testing the effect of water amount on seed germination?

Explanation opens after your attempt
Correct Answer

C. पानी की मात्राAmount of water

Step 1

Concept

The amount of water is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is C. पानी की मात्रा / Amount of water. The amount of water is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

पानी की मात्रा जानबूझकर बदली जाती है। इसलिए यह स्वतंत्र चर है।

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उसी जांच में अंकुरित बीजों की संख्या कौन सा चर है?

In the same investigation what type of variable is the number of germinated seeds?

Explanation opens after your attempt
Correct Answer

D. आश्रित चरDependent variable

Step 1

Concept

The number of germinated seeds is measured. Therefore it is the dependent variable.

Step 2

Why this answer is correct

The correct answer is D. आश्रित चर / Dependent variable. The number of germinated seeds is measured. Therefore it is the dependent variable.

Step 3

Exam Tip

अंकुरित बीजों की संख्या मापी जाती है। इसलिए यह आश्रित चर है।

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बीज अंकुरण की जांच में बीज का प्रकार कैसा रखना चाहिए?

How should the type of seed be kept in a germination investigation?

Explanation opens after your attempt
Correct Answer

A. समानThe same

Step 1

Concept

Using the same type of seed keeps the effect of water amount clear. Seed type is a controlled variable.

Step 2

Why this answer is correct

The correct answer is A. समान / The same. Using the same type of seed keeps the effect of water amount clear. Seed type is a controlled variable.

Step 3

Exam Tip

समान प्रकार के बीज रखने से पानी की मात्रा का प्रभाव स्पष्ट रहता है। बीज का प्रकार नियंत्रित चर है।

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तापमान का बर्फ के पिघलने पर प्रभाव जांचते समय क्या मापा जा सकता है?

What can be measured while testing the effect of temperature on melting ice?

Explanation opens after your attempt
Correct Answer

B. पिघलने में लगा समयTime taken to melt

Step 1

Concept

The time taken to melt shows the effect of temperature. It is the dependent variable.

Step 2

Why this answer is correct

The correct answer is B. पिघलने में लगा समय / Time taken to melt. The time taken to melt shows the effect of temperature. It is the dependent variable.

Step 3

Exam Tip

पिघलने में लगा समय तापमान के प्रभाव को दिखाता है। यह आश्रित चर है।

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बर्फ के पिघलने की जांच में बर्फ के टुकड़ों का आकार कैसा होना चाहिए?

How should the size of ice pieces be kept in a melting investigation?

Explanation opens after your attempt
Correct Answer

C. समानThe same

Step 1

Concept

Keeping ice pieces the same size allows a fair comparison of the effect of temperature.

Step 2

Why this answer is correct

The correct answer is C. समान / The same. Keeping ice pieces the same size allows a fair comparison of the effect of temperature.

Step 3

Exam Tip

समान आकार के टुकड़े रखने से तापमान का प्रभाव निष्पक्ष रूप से तुलना किया जा सकता है।

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किस विकल्प में स्वतंत्र चर दिया गया है?

Which option gives an independent variable?

Explanation opens after your attempt
Correct Answer

D. खाद की बदली गई मात्राChanged amount of fertiliser

Step 1

Concept

The amount of fertiliser is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is D. खाद की बदली गई मात्रा / Changed amount of fertiliser. The amount of fertiliser is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

खाद की मात्रा जानबूझकर बदली गई है। इसलिए यह स्वतंत्र चर है।

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किस विकल्प में आश्रित चर दिया गया है?

Which option gives a dependent variable?

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Correct Answer

A. प्रकाश बदलने पर पत्तियों की संख्याNumber of leaves when light is changed

Step 1

Concept

The number of leaves is the measured outcome. Therefore it is the dependent variable.

Step 2

Why this answer is correct

The correct answer is A. प्रकाश बदलने पर पत्तियों की संख्या / Number of leaves when light is changed. The number of leaves is the measured outcome. Therefore it is the dependent variable.

Step 3

Exam Tip

पत्तियों की संख्या मापा गया परिणाम है। इसलिए यह आश्रित चर है।

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किस विकल्प में नियंत्रित चर दिया गया है?

Which option gives a controlled variable?

Explanation opens after your attempt
Correct Answer

B. हर परीक्षण में समान पानी का आयतनSame volume of water in every trial

Step 1

Concept

The volume of water kept the same in every trial is a controlled variable.

Step 2

Why this answer is correct

The correct answer is B. हर परीक्षण में समान पानी का आयतन / Same volume of water in every trial. The volume of water kept the same in every trial is a controlled variable.

Step 3

Exam Tip

हर परीक्षण में समान रखा गया पानी का आयतन नियंत्रित चर है।

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खाद का पौधे की वृद्धि पर प्रभाव जांचते समय पौधे की ऊंचाई क्या है?

What is plant height while testing the effect of fertiliser on plant growth?

Explanation opens after your attempt
Correct Answer

C. आश्रित चरDependent variable

Step 1

Concept

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

Step 2

Why this answer is correct

The correct answer is C. आश्रित चर / Dependent variable. Plant height is the measured outcome. Therefore it is the dependent variable.

Step 3

Exam Tip

पौधे की ऊंचाई मापा गया परिणाम है। इसलिए यह आश्रित चर है।

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उसी प्रयोग में खाद की मात्रा क्या है?

In the same experiment what is the amount of fertiliser?

Explanation opens after your attempt
Correct Answer

D. स्वतंत्र चरIndependent variable

Step 1

Concept

The amount of fertiliser 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. The amount of fertiliser is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

खाद की मात्रा जानबूझकर बदली जाती है। इसलिए यह स्वतंत्र चर है।

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खाद के प्रयोग में मिट्टी की मात्रा कैसी रखनी चाहिए?

How should the amount of soil be kept in a fertiliser experiment?

Explanation opens after your attempt
Correct Answer

A. समानThe same

Step 1

Concept

Keeping the amount of soil the same makes the effect of fertiliser clear. It is a controlled variable.

Step 2

Why this answer is correct

The correct answer is A. समान / The same. Keeping the amount of soil the same makes the effect of fertiliser clear. It is a controlled variable.

Step 3

Exam Tip

मिट्टी की मात्रा समान रखने से खाद का प्रभाव स्पष्ट रहता है। यह नियंत्रित चर है।

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यदि पानी की मात्रा और प्रकाश दोनों बदल दिए जाएं तो प्रयोग कैसा होगा?

What will the experiment be like if both water amount and light are changed?

Explanation opens after your attempt
Correct Answer

B. निष्पक्ष नहींNot fair

Step 1

Concept

Changing two main factors makes the cause of the result unclear. Therefore the experiment will not be fair.

Step 2

Why this answer is correct

The correct answer is B. निष्पक्ष नहीं / Not fair. Changing two main factors makes the cause of the result unclear. Therefore the experiment will not be fair.

Step 3

Exam Tip

दो मुख्य कारक बदलने से परिणाम का कारण स्पष्ट नहीं रहेगा। इसलिए प्रयोग निष्पक्ष नहीं होगा।

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एक प्रयोग में पात्र का आकार हर बार समान है। पात्र का आकार कौन सा चर है?

In an experiment the container size is the same every time. What type of variable is container size?

Explanation opens after your attempt
Correct Answer

C. नियंत्रित चरControlled variable

Step 1

Concept

Container size kept the same every time is a controlled variable.

Step 2

Why this answer is correct

The correct answer is C. नियंत्रित चर / Controlled variable. Container size kept the same every time is a controlled variable.

Step 3

Exam Tip

हर बार समान रखा गया पात्र का आकार नियंत्रित चर है।

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यदि पात्र का आकार हर परीक्षण में बदल जाए तो क्या हो सकता है?

What may happen if container size changes in every trial?

Explanation opens after your attempt
Correct Answer

D. पात्र का आकार परिणाम को प्रभावित कर सकता हैContainer size may affect the result

Step 1

Concept

Container size may also influence the result. It should be controlled.

Step 2

Why this answer is correct

The correct answer is D. पात्र का आकार परिणाम को प्रभावित कर सकता है / Container size may affect the result. Container size may also influence the result. It should be controlled.

Step 3

Exam Tip

पात्र का आकार भी परिणाम पर प्रभाव डाल सकता है। इसे नियंत्रित रखना चाहिए।

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किस प्रश्न में स्वतंत्र चर प्रकाश की अवधि है?

In which question is light duration the independent variable?

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Correct Answer

A. प्रकाश की अवधि पत्तियों की संख्या को कैसे प्रभावित करती हैHow does light duration affect the number of leaves

Step 1

Concept

In this question light duration is changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is A. प्रकाश की अवधि पत्तियों की संख्या को कैसे प्रभावित करती है / How does light duration affect the number of leaves. In this question light duration is changed. Therefore it is the independent variable.

Step 3

Exam Tip

इस प्रश्न में प्रकाश की अवधि बदली जाती है। इसलिए यह स्वतंत्र चर है।

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किस प्रश्न में आश्रित चर सूखने का समय है?

In which question is drying time the dependent variable?

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Correct Answer

B. धूप और छाया में कपड़ा कितनी देर में सूखता हैHow long does cloth take to dry in sunlight and shade

Step 1

Concept

The time taken to dry is measured. Therefore it is the dependent variable.

Step 2

Why this answer is correct

The correct answer is B. धूप और छाया में कपड़ा कितनी देर में सूखता है / How long does cloth take to dry in sunlight and shade. The time taken to dry is measured. Therefore it is the dependent variable.

Step 3

Exam Tip

सूखने में लगा समय मापा जाता है। इसलिए यह आश्रित चर है।

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कपड़ा सुखाने के प्रयोग में कपड़े का आकार क्या होना चाहिए?

What should be the size of cloth in a drying experiment?

Explanation opens after your attempt
Correct Answer

C. समानThe same

Step 1

Concept

Cloths of the same size allow a fair comparison of sunlight and shade.

Step 2

Why this answer is correct

The correct answer is C. समान / The same. Cloths of the same size allow a fair comparison of sunlight and shade.

Step 3

Exam Tip

समान आकार के कपड़ों से धूप और छाया का निष्पक्ष प्रभाव देखा जा सकता है।

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किस चर के मान को प्रयोगकर्ता स्वयं तय करता है?

Which variable is set by the experimenter?

Explanation opens after your attempt
Correct Answer

D. स्वतंत्र चरIndependent variable

Step 1

Concept

The experimenter sets different values of the independent variable. Its effect is then measured.

Step 2

Why this answer is correct

The correct answer is D. स्वतंत्र चर / Independent variable. The experimenter sets different values of the independent variable. Its effect is then measured.

Step 3

Exam Tip

प्रयोगकर्ता स्वतंत्र चर के अलग मान तय करता है। फिर उसका प्रभाव मापा जाता है।

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कौन सा चर स्वतंत्र चर के बदलने पर बदल सकता है?

Which variable may change when the independent variable is changed?

Explanation opens after your attempt
Correct Answer

A. आश्रित चरDependent variable

Step 1

Concept

The dependent variable may change because of the independent variable. It is measured or observed.

Step 2

Why this answer is correct

The correct answer is A. आश्रित चर / Dependent variable. The dependent variable may change because of the independent variable. It is measured or observed.

Step 3

Exam Tip

आश्रित चर स्वतंत्र चर के प्रभाव के कारण बदल सकता है। इसे मापा या देखा जाता है।

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कौन से चर प्रयोग में जानबूझकर नहीं बदले जाते?

Which variables are not deliberately changed in an experiment?

Explanation opens after your attempt
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?

Explanation opens after your attempt
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?

Explanation opens after your attempt
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?

Explanation opens after your attempt
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?

Explanation opens after your attempt
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?

Explanation opens after your attempt
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?

Explanation opens after your attempt
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?

Explanation opens after your attempt
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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किस विकल्प में चर का गलत मेल है?

Which option incorrectly matches a variable with its role?

Explanation opens after your attempt
Correct Answer

D. मापा गया समय नियंत्रित चरMeasured time as controlled variable

Step 1

Concept

Measured time is a dependent variable rather than a controlled variable. Identify the quantity measured as the outcome.

Step 2

Why this answer is correct

The correct answer is D. मापा गया समय नियंत्रित चर / Measured time as controlled variable. Measured time is a dependent variable rather than a controlled variable. Identify the quantity measured as the outcome.

Step 3

Exam Tip

मापा गया समय आश्रित चर होता है न कि नियंत्रित चर। परिणाम के रूप में मापी गई राशि पहचानें।

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किस प्रश्न में स्वतंत्र चर पानी का तापमान है?

In which question is water temperature the independent variable?

Explanation opens after your attempt
Correct Answer

A. पानी का तापमान नमक के घुलने के समय को कैसे प्रभावित करता हैHow does water temperature affect the time taken for salt to dissolve

Step 1

Concept

In this question water temperature is changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is A. पानी का तापमान नमक के घुलने के समय को कैसे प्रभावित करता है / How does water temperature affect the time taken for salt to dissolve. In this question water temperature is changed. Therefore it is the independent variable.

Step 3

Exam Tip

इस प्रश्न में पानी का तापमान बदला जाता है। इसलिए यह स्वतंत्र चर है।

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किस प्रश्न में आश्रित चर वाष्पीकरण में लगा समय है?

In which question is the time taken for evaporation the dependent variable?

Explanation opens after your attempt
Correct Answer

B. अलग तापमान पर पानी को वाष्पित होने में कितना समय लगता हैHow long does water take to evaporate at different temperatures

Step 1

Concept

The time taken for evaporation is measured. Therefore it is the dependent variable.

Step 2

Why this answer is correct

The correct answer is B. अलग तापमान पर पानी को वाष्पित होने में कितना समय लगता है / How long does water take to evaporate at different temperatures. The time taken for evaporation is measured. Therefore it is the dependent variable.

Step 3

Exam Tip

वाष्पीकरण में लगा समय मापा जाता है। इसलिए यह आश्रित चर है।

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वाष्पीकरण के प्रयोग में पानी का प्रारंभिक आयतन कैसा रखना चाहिए?

How should the initial volume of water be kept in an evaporation experiment?

Explanation opens after your attempt
Correct Answer

C. समानThe same

Step 1

Concept

Keeping the initial water volume the same allows a fair observation of the effect of temperature.

Step 2

Why this answer is correct

The correct answer is C. समान / The same. Keeping the initial water volume the same allows a fair observation of the effect of temperature.

Step 3

Exam Tip

पानी का प्रारंभिक आयतन समान रखने से तापमान का प्रभाव निष्पक्ष रूप से देखा जा सकता है।

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यदि नियंत्रित चर समान न रखे जाएं तो क्या होगा?

What happens if controlled variables are not kept the same?

Explanation opens after your attempt
Correct Answer

D. परिणाम की सही व्याख्या कठिन होगीCorrect interpretation of the result will be difficult

Step 1

Concept

Uncontrolled factors may also affect the result. This makes it difficult to identify the correct cause.

Step 2

Why this answer is correct

The correct answer is D. परिणाम की सही व्याख्या कठिन होगी / Correct interpretation of the result will be difficult. Uncontrolled factors may also affect the result. This makes it difficult to identify the correct cause.

Step 3

Exam Tip

अनियंत्रित कारक भी परिणाम को प्रभावित कर सकते हैं। इसलिए सही कारण पहचानना कठिन हो जाता है।

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प्रयोग में चर पहचानने का सही क्रम कौन सा है?

What is the correct way to identify variables in an experiment?

Explanation opens after your attempt
Correct Answer

A. क्या बदला क्या मापा और क्या समान रखा गयाWhat was changed what was measured and what was kept the same

Step 1

Concept

To identify variables look for the factor changed measured and kept the same. These are the three main roles.

Step 2

Why this answer is correct

The correct answer is A. क्या बदला क्या मापा और क्या समान रखा गया / What was changed what was measured and what was kept the same. To identify variables look for the factor changed measured and kept the same. These are the three main roles.

Step 3

Exam Tip

चर पहचानने के लिए बदला गया मापा गया और समान रखा गया कारक खोजें। यही तीन मुख्य भूमिकाएं हैं।

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स्वतंत्र आश्रित और नियंत्रित चर का सही संबंध क्या है?

What is the correct relationship among independent dependent and controlled variables?

Explanation opens after your attempt
Correct Answer

A. स्वतंत्र चर बदला जाता है आश्रित चर मापा जाता है और नियंत्रित चर समान रखे जाते हैंThe independent variable is changed the dependent variable is measured and controlled variables are kept the same

Step 1

Concept

The independent variable is changed as the cause and the dependent variable is measured as the outcome. Controlled variables maintain fairness.

Step 2

Why this answer is correct

The correct answer is A. स्वतंत्र चर बदला जाता है आश्रित चर मापा जाता है और नियंत्रित चर समान रखे जाते हैं / The independent variable is changed the dependent variable is measured and controlled variables are kept the same. The independent variable is changed as the cause and the dependent variable is measured as the outcome. Controlled variables maintain fairness.

Step 3

Exam Tip

स्वतंत्र चर कारण के रूप में बदला जाता है और आश्रित चर परिणाम के रूप में मापा जाता है। नियंत्रित चर निष्पक्षता बनाए रखते हैं।

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एक छात्र अलग मात्रा में नमक मिलाकर पानी के क्वथन समय को मापता है। नमक की मात्रा कौन सा चर है?

A student adds different amounts of salt and measures the boiling time of water. What type of variable is the amount of salt?

Explanation opens after your attempt
Correct Answer

C. स्वतंत्र चरIndependent variable

Step 1

Concept

The amount of salt is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is C. स्वतंत्र चर / Independent variable. The amount of salt is deliberately changed. Therefore it is the independent variable.

Step 3

Exam Tip

नमक की मात्रा जानबूझकर बदली जाती है। इसलिए यह स्वतंत्र चर है।

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एक प्रयोग में अलग सतह क्षेत्र वाले पात्रों में समान पानी रखा जाता है। पानी के वाष्पीकरण की मात्रा कौन सा चर है?

In an experiment equal amounts of water are kept in containers with different surface areas. What type of variable is the amount of water evaporated?

Explanation opens after your attempt
Correct Answer

B. आश्रित चरDependent variable

Step 1

Concept

The amount of water evaporated is the measured outcome. Therefore it is the dependent variable.

Step 2

Why this answer is correct

The correct answer is B. आश्रित चर / Dependent variable. The amount of water evaporated is the measured outcome. Therefore it is the dependent variable.

Step 3

Exam Tip

वाष्पित पानी की मात्रा मापा गया परिणाम है। इसलिए यह आश्रित चर है।

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ध्वनि की तीव्रता का बीज अंकुरण पर प्रभाव जांचते समय तापमान कैसा रखना चाहिए?

How should temperature be kept while testing the effect of sound intensity on seed germination?

Explanation opens after your attempt
Correct Answer

D. सभी समूहों में समानThe same in all groups

Step 1

Concept

Keeping temperature the same in all groups isolates the effect of sound intensity. Temperature is a controlled variable here.

Step 2

Why this answer is correct

The correct answer is D. सभी समूहों में समान / The same in all groups. Keeping temperature the same in all groups isolates the effect of sound intensity. Temperature is a controlled variable here.

Step 3

Exam Tip

तापमान सभी समूहों में समान रखने से केवल ध्वनि की तीव्रता का प्रभाव देखा जाएगा। तापमान यहां नियंत्रित चर है।

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FAQs

Class 9 Science Quiz FAQs

How many questions are in this quiz?

This level is designed for 50 active questions. Currently 50 questions are available for the selected class and difficulty.

Is there a timer in this quiz?

Yes, the timer uses 40 seconds per question for Easy difficulty and shows the total remaining time on the page.

Can I open each question separately?

Yes, every question has its own SEO-friendly page with answer, explanation and related practice links.