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Science Hypothesis and experimentation MCQ Questions for Class 9

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Hypothesis and experimentation Practice Questions

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नियंत्रित चर क्या होते हैं?

What are controlled variables?

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Correct Answer

B. वे कारक जिन्हें समान रखा जाता हैFactors kept the same

Step 1

Concept

Controlled variables are kept the same during an experiment. This makes the effect of the independent variable clear.

Step 2

Why this answer is correct

The correct answer is B. वे कारक जिन्हें समान रखा जाता है / Factors kept the same. Controlled variables are kept the same during an experiment. This makes the effect of the independent variable clear.

Step 3

Exam Tip

नियंत्रित चर प्रयोग के दौरान समान रखे जाते हैं। इससे केवल स्वतंत्र चर का प्रभाव स्पष्ट होता है।

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निष्पक्ष प्रयोग में सामान्यतः कितने स्वतंत्र चर बदले जाने चाहिए?

How many independent variables should usually be changed in a fair experiment?

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Correct Answer

C. एकOne

Step 1

Concept

Usually only one independent variable is changed in a fair experiment. Other relevant factors are kept constant.

Step 2

Why this answer is correct

The correct answer is C. एक / One. Usually only one independent variable is changed in a fair experiment. Other relevant factors are kept constant.

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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यदि एक साथ कई कारक बदल दिए जाएं तो क्या समस्या होगी?

What problem occurs if several factors are changed at the same time?

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Correct Answer

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

Step 1

Concept

Changing several factors together makes the cause of the result unclear. Change only one factor for a fair test.

Step 2

Why this answer is correct

The correct answer is D. परिणाम का वास्तविक कारण पहचानना कठिन होगा / It will be difficult to identify the actual cause of the result. Changing several factors together makes the cause of the result unclear. Change only one factor for a fair test.

Step 3

Exam Tip

एक साथ कई कारक बदलने से परिणाम का कारण स्पष्ट नहीं रहता। निष्पक्ष जांच के लिए एक ही कारक बदलें।

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किस कथन में सही परिकल्पना दी गई है?

Which statement is a correct hypothesis?

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Correct Answer

A. यदि पौधे को अधिक प्रकाश मिलेगा तो उसकी ऊंचाई अधिक बढ़ेगीIf a plant receives more light then its height will increase more

Step 1

Concept

This statement gives a testable relationship between light and plant height. Such a hypothesis can be tested experimentally.

Step 2

Why this answer is correct

The correct answer is A. यदि पौधे को अधिक प्रकाश मिलेगा तो उसकी ऊंचाई अधिक बढ़ेगी / If a plant receives more light then its height will increase more. This statement gives a testable relationship between light and plant height. Such a hypothesis can be tested experimentally.

Step 3

Exam Tip

यह कथन प्रकाश और पौधे की ऊंचाई के बीच जांच योग्य संबंध बताता है। ऐसी परिकल्पना प्रयोग से जांची जा सकती है।

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परिकल्पना बनाते समय किस शब्द समूह का उपयोग उपयोगी होता है?

Which phrase is useful while forming a hypothesis?

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Correct Answer

B. यदि ऐसा तो वैसाIf this then that

Step 1

Concept

The if this then that form makes the cause and expected result clear. It helps make a hypothesis testable.

Step 2

Why this answer is correct

The correct answer is B. यदि ऐसा तो वैसा / If this then that. The if this then that form makes the cause and expected result clear. It helps make a hypothesis testable.

Step 3

Exam Tip

यदि ऐसा तो वैसा वाला रूप कारण और अपेक्षित परिणाम स्पष्ट करता है। इससे परिकल्पना जांच योग्य बनती है।

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एक छात्र जांचता है कि गर्म पानी में चीनी जल्दी घुलती है या नहीं। स्वतंत्र चर कौन सा है?

A student tests whether sugar dissolves faster in hot water. What is the independent variable?

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Correct Answer

C. पानी का तापमानTemperature of water

Step 1

Concept

The water temperature is deliberately changed. Therefore it is the independent variable.

Step 2

Why this answer is correct

The correct answer is C. पानी का तापमान / Temperature of water. The 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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उसी प्रयोग में आश्रित चर कौन सा है?

In the same experiment what is the dependent variable?

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Correct Answer

D. चीनी के घुलने में लगा समयTime taken for sugar to dissolve

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 D. चीनी के घुलने में लगा समय / Time taken for sugar to dissolve. 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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पौधों पर पानी की मात्रा का प्रभाव जांचते समय क्या समान रखना चाहिए?

What should be kept the same while testing the effect of water amount on plants?

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Correct Answer

A. पौधे का प्रकारType of plant

Step 1

Concept

Keeping the plant type the same makes the effect of water amount clear. Water amount will be the independent variable.

Step 2

Why this answer is correct

The correct answer is A. पौधे का प्रकार / Type of plant. Keeping the plant type the same makes the effect of water amount clear. Water amount will be the independent variable.

Step 3

Exam Tip

पौधे का प्रकार समान रखने से पानी की मात्रा का प्रभाव स्पष्ट होता है। पानी की मात्रा स्वतंत्र चर होगी।

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प्रयोग में आंकड़े कब दर्ज करने चाहिए?

When should data be recorded during an experiment?

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Correct Answer

C. अवलोकन या मापन के समयAt the time of observation or measurement

Step 1

Concept

Recording data immediately reduces forgetting and alteration. Write the unit with every measurement.

Step 2

Why this answer is correct

The correct answer is C. अवलोकन या मापन के समय / At the time of observation or measurement. Recording data immediately reduces forgetting and alteration. Write the unit with every measurement.

Step 3

Exam Tip

आंकड़े तुरंत दर्ज करने से भूल और बदलाव की संभावना कम होती है। हर मापन के साथ इकाई लिखें।

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नियंत्रण समूह का उद्देश्य क्या है?

What is the purpose of a control group?

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Correct Answer

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

Step 1

Concept

A control group shows the condition without the independent variable being applied. It provides a basis for comparison.

Step 2

Why this answer is correct

The correct answer is A. तुलना के लिए सामान्य आधार देना / To provide a normal basis for comparison. A control group shows the condition without the independent variable being applied. It provides a basis for comparison.

Step 3

Exam Tip

नियंत्रण समूह उस स्थिति को दिखाता है जिसमें स्वतंत्र चर लागू नहीं किया जाता। इससे प्रभाव की तुलना की जाती है।

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