CHEMISTRY CLASS 10TH MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
اگر پی ایچ قدر 7 سے زیادہ ہے، تو حل ______ ہے؟
Acidic
Basic
Amphoteric
Neutral
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Explanation
If the pH value is greater than 7 , the solution is basic (also known as alkaline). This means that the concentration of hydroxide ions (OH-) is higher than the concentration of hydrogen ions (H+). Key Points:
pH < 7: Acidic pH = 7: Neutral pH > 7: Basic (or alkaline)
مندرجہ ذیل میں سے کون سا خام تیل کا ایک حصہ نہیں ہے؟
Petroleum coke
Ammonia
Fuel oil
Paraffin wax
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Explanation
Ammonia (NH3) is not a fraction of crude oil.
Crude oil is a mixture of various hydrocarbons, which are separated into different fractions based on their boiling points and properties.
The main fractions of crude oil are:
Refinery gas Liquefied petroleum gas (LPG) Naphtha Gasoline Kerosene Diesel fuel Fuel oil Lubricating oils Paraffin wax Petroleum coke (also known as petcoke)
مندرجہ ذیل میں سے کون سا جیٹ ایندھن کے طور پر استعمال ہوتا ہے؟
Kerosene oil
Fuel oil
Petrol
Diesel oil
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Explanation
Kerosene oil is used as jet fuel , commonly known as Jet-A or Jet-A1.
It has a high energy density and good combustion properties suitable for aircraft engines.
کٹائی ______ کا سب سے اہم مرحلہ ہے؟
Preparation of soap
Preparation of cold drinks
Preparation of sugar
Preparation of medicines
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Explanation
Harvesting is the most important step in the preparation of sugar from sugarcane or sugar beets.
Sugarcane is typically harvested by hand or by machine, and sugar beets are harvested by machine.
The quality of the harvest affects the quality of the sugar produced.
Water
Water insoluble minerals
Water semi soluble minerals
Water absorving minerals
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Explanation
Abrasives are substances that wear away or remove material through friction or rubbing.
Examples of abrasives include :
Water insoluble minerals like :
Silica (sand) Alumina (aluminum oxide) Calcium carbonate (limestone) Diamond
کو الگ کرنے کے لیے استعمال ہونے والی سینٹری فیوج مشین؟ ____
Juice
pH
Mud
Crystal
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Explanation
A centrifuge is a machine that uses centrifugal force to separate particles of different densities or sizes from a mixture.
It is commonly used to separate :
Liquids from solids (e.g., mud, sludge) Heavy particles from lighter particles (e.g., sedimentation) Immiscible liquids (e.g., oil and water)
سائٹرک ایسڈ کو کولڈ ڈرنکس کی تیاری میں استعمال کیا جاتا ہے؟
Sweet taste
Bitter taste
Sour taste
Salty taste
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Explanation
Citric acid is a natural preservative and flavoring agent that is commonly used in foods and beverages to add a sour taste.
It is particularly useful in cold drinks, such as:
Soft drinks (e.g., lemon-lime soda) Fruit juices (e.g., orange, grapefruit) Sports drinks Energy drinks
پوٹاشیم ہائیڈرو آکسائیڈ کے استعمال سے ________ پیدا ہوا؟
Hard soap
Soft soap
Moderate soap
All of these
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Explanation
Potassium hydroxide (KOH) is used to make soft soaps, which are typically more soluble and have a lower melting point than soaps made with sodium hydroxide (NaOH).
Soft soaps are often used in liquid soaps, shampoos, and body washes.
صابن کے مالیکیول کے کاربو آکسیلیٹ سرے کو جو پانی کی طرف راغب کرتا ہے ____ کہلاتا ہے؟
Hydrophobic end
End point
Hydrophilic end
None
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Explanation
The carboxylate end of a soap molecule (-COO-) is hydrophilic (water-loving) , meaning it is attracted to water.
This end of the molecule is negatively charged and is able to form hydrogen bonds with water molecules , which are polar and also have a slightly positive charge.
سرفیکٹنٹ پانی کے ______ کو کم کرتے ہیں۔
Viscosity
Surface tension
Boiling point
Melting Point
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Explanation
Surfactants reduce the surface tension of water , which is the energy required to create a surface between water and air.
By reducing surface tension , surfactants make it easier for water to spread and penetrate surfaces , which is important for cleaning and other applications.