CHEMISTRY CLASS 10TH MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مندرجہ ذیل میں سے کون سی گلوبل وارمنگ کی وجہ ہے؟
Presence of sulphite
Rise in CO2 concentration
Oxides of nitrogen
Formtion of ozone
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Explanation
Global warming is primarily caused by the increasing levels of carbon dioxide (CO2) in the Earth's atmosphere , which traps heat and leads to a warming effect.
The main reason for this increase is human activities such as :
Burning fossil fuels like coal, oil, and gas Deforestation and land-use changes
mol dm^-3
mol^-2 dm^6
mol^-1dm3
No unit
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Explanation
The equilibrium constant, Kc, for the reaction:
N2 + O2 ⇌ 2NO is unitless (No unit).
Since the number of moles of gas is the same on both the reactant and product sides (2 moles).
The concentration terms in the equilibrium constant expression cancel out, leaving Kc without units.
زمین کے ماحول کی دوسری بلند ترین تہہ ______ ہے؟
Troposphere
Stratosphere
Mesosphere
Thermosphere
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Explanation
The stratosphere is the second layer of Earth's atmosphere as you go upwards, lying above the troposphere and below the mesosphere.
The layers of the Earth's atmosphere , in order from the surface, are:
Troposphere (up to about 12 km/7.5 miles) Stratosphere (up to about 50 km/31 miles) Mesosphere (up to about 85 km/53 miles) Thermosphere (up to about 600 km/373 miles)
اوزون ایک گیس ہے جو ____ تہہ میں پائی جاتی ہے؟
Troposphere
Mesosphere
Stratosphere
Exosphere
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Explanation
Ozone (O3) is a gas found in the stratosphere.
A stratosphere layer of the atmosphere that extends from about 12 to 50 kilometers (7.5 to 31 miles) above the Earth's surface.
The ozone layer, also known as the ozonosphere.
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)