GENERAL SCIENCE CLASS 8 MCQS
General
Science MCQs Click Here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ٹارٹرک ایسڈ _____ میں پایا جاتا ہے؟
- Orange and Mango
- Lemon and Apple
- Tamarind and Grapes
- All of these
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Explanation
- Tartaric acid is a white, crystalline organic acid that occurs naturally in many fruits, most notably in grapes and tamarinds.
- It also found in bananas, avocados, and citrus fruits.
نتیجے میں حل نہ تو تیزابی ہے اور نہ ہی بنیادی غیر جانبدار۔ اس عمل کو کیا کہتے ہیں؟
- Ionization
- Oxidation
- Decomposition
- Neutralization
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Explanation
- Neutralization is a chemical reaction where an acid and a base combine to form a neutral solution, neither acidic nor basic, with a pH of 7.
- This process is commonly seen in reactions between strong acids and strong bases, resulting in the formation of a salt and water.
پانی کے محلول میں ہائیڈروکسیل آئن پیدا کرنے والا مادہ کہلاتا ہے؟
- Oxidizing agent
- Reducing agent
- Base
- Acid
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Explanation
- A base is a substance that produces hydroxide ions (OH-) in an aqueous solution, making the solution basic.
- Examples of bases include sodium hydroxide (NaOH), calcium hydroxide (Ca(OH)2), and ammonium hydroxide (NH4OH).
وہ مادہ جو آبی محلول میں ہائیڈروجن آئن پیدا کرتا ہے اسے ____ کہتے ہیں؟
- Base
- Acid
- Oxidizing agent
- Reducing agent
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Explanation
- An acid is a substance that donates a proton (H+ ion) in a reaction, increasing the concentration of hydrogen ions in an aqueous solution.
- Examples of acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH).
تیزاب کی اصطلاح لاطینی لفظ ____ سے آتی ہے؟
- Acidus
- Acidos
- Acare
- Acre
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Explanation
The term "acid" comes from the Latin word "acidus," meaning sour.This relates to the sour taste of many acids like citrus juice or vinegar.
ترکیب رد عمل کی ایک مثال کیا ہے؟
- Water decomposing into Hydrogen and Oxygen
- Carbon combining with Oxygen to form Carbon Monoxide
- Nitrogen and Oxygen combining to form Nitrogen Dioxide
- Hydrogen and Oxygen combining to form water
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Explanation
- Hydrogen and Oxygen combining to form water, which is an example of a synthesis reaction: 2H2 + O2 → 2H2O
- In this reaction, two substances (hydrogen and oxygen) combine to form a new compound (water).
مندرجہ ذیل میں سے کون سی مساوات اضافی ردعمل کی نمائندگی کرتی ہے؟
- AB → A+B
- A → AB
- A+B → AB
- AB → A+C
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Explanation
The equation A+B → AB represents an addition reaction, where two substances (A and B) combine to form a new compound (AB).
- Combination Reaction
- Decomposition Reaction
- Neutralization Reaction
- None
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Explanation
- The given reaction, CaO + CO2 → CaCO2, is an example of a Combination Reaction, also known as a Synthesis Reaction or Addition Reaction.
- In this reaction, two substances, calcium oxide (CaO) and carbon dioxide (CO2), combine to form a single compound, calcium carbonate (CaCO2).
اضافی ردعمل کو ____ کے نام سے بھی جانا جاتا ہے؟
- Combination Reaction
- Synthesis Reaction
- Decomposition Reaction
- Both A and B
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Explanation
- An Addition Reaction is also known as both a Combination Reaction and a Synthesis Reaction.
- All three terms refer to a chemical reaction where two or more substances combine to form a new, single compound.
کیمیائی رد عمل کے دوران ری ایکٹنٹس اور مصنوعات کا کل ماس محفوظ رہے گا، اس بیان کو _____ کہا جاتا ہے؟
- Law of definite proportions
- Law of conservation of mass
- Law of multiple proportions
- Law of reciprocal proportions
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Explanation
The statement "Total mass of the reactants and products will remain conserved during a chemical reaction" is called the Law of Conservation of Mass.
