CHEMISTRY CLASS 10TH MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
Hydrogen bond
Ionic bond
Covalent bond
All of these
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Explanation
The bond formed between water molecules (H2O ) is a hydrogen bond.
The bond within the water molecule itself is a covalent bond
زمین کی سطح کا کتنا فیصد (%) پانی سے ڈھکا ہوا ہے؟
70%
60%
90%
75%
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Explanation
Approximately 70% of the Earth's surface is covered with water.
This includes oceans, seas, lakes, rivers , and other bodies of water.
مندرجہ ذیل میں سے کون سی پانی سے پیدا ہونے والی بیماری وائرل ہے؟
Typhoid fever
Polio
Dysentery
Diarrhea
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Explanation
Polio is also known as poliomyelitis.
It is a disease caused by the poliovirus.
The virus is usually spread through the fecal-oral route, which includes through contaminated water and food.
اسٹراٹاسفیئر پر اونچائی ______ ہے؟
40 to 45 km
50 to 55 km
60 to 65 km
70 to 75 km
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Explanation
The bottom of the stratosphere is around 10 km (6.2 miles or about 33,000 feet) above the ground at middle latitudes.
The top of the stratosphere occurs at an altitude of 50 km (31 miles).
نائٹروجن کے بعد حجم کے لحاظ سے خشک ہوا کا دوسرا سب سے زیادہ پرچر جز ہے؟
Nitrogen
Oxygen
Argon
Carbon Dioxide
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Explanation
The composition of dry air is:
Nitrogen (N2) - approximately 78.08% by volume Oxygen (O2) - approximately 20.95% (21%) by volume Argon (Ar) - approximately 0.93% by volume Carbon Dioxide (CO2) - approximately 0.04% by volume (varies with location and time)
کون سی گرین ہاؤس گیسوں کا حصہ نہیں ہے؟
Carbon dioxide
Methane
Nitrous oxide
Oxygen
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Explanation
Oxygen (O2) is not a greenhouse gas.
Greenhouse gases are gases in the Earth's atmosphere that absorb and emit radiation, trapping heat and contributing to the Greenhouse Effect.
The main greenhouse gases are:
Carbon dioxide (CO2) Methane (CH4) Nitrous oxide (N2O) Water vapor (H2O) Ozone (O3) Chlorofluorocarbons (CFCs) Hydrofluorocarbons (HFCs) Perfluorocarbons (PFCs)
اوزون کی تہہ ______ کا حصہ ہے؟
Mesosphere
Stratosphere
Thermosphere
Troposphere
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Explanation
The ozone layer is a region within the stratosphere , extending from about 15 to 30 km (9 to 19 miles) above the Earth's surface.
It contains a high concentration of ozone (O3) , a molecule made up of three oxygen atoms.
The ozone layer plays a crucial role in protecting the Earth from harmful ultraviolet (UV) radiation from the sun, particularly UV-C and UV-B rays.
ماحول کی وہ تہہ جو اسٹراٹاسفیر اور ٹروپوسفیئر کو الگ کرتی ہے اسے _____ کہا جاتا ہے؟
Tropo-pause
Mesopause
Stratopause
Thermopause
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Explanation
The tropopause is the layer that separates the stratosphere and troposphere.
It's a boundary layer located at an average altitude of around 12 km (7.5 miles) above the Earth's surface , where the troposphere ends and the stratosphere begins.
ماحولیاتی دباؤ ______ کے ساتھ کم ہوتا ہے؟
Increase in longitude
Decrease in altitude
Increase in altitude
Increase in latitude
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Explanation
Atmospheric pressure decreases as altitude increases.
As you go higher , the air pressure decreases because there are fewer air molecules above you , exerting less pressure.
This is why aircraft pilots must adjust their altimeters to account for changes in air pressure as they ascend or descend.
ہوائی جہاز ______ میں اڑتے ہیں؟
Troposphere
Stratosphere
Mesosphere
Thermosphere
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Explanation
Aeroplanes fly in the troposphere , which is the lowest layer of the Earth's atmosphere, extending up to about 12 km (7.5 miles) above the Earth's surface.
The troposphere is where weather occurs , and it's the layer where aircraft operate , typically cruising at altitudes between 30,000 to 40,000 feet (9,100 to 12,200 meters).