EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
واٹر گیس ______ کا مرکب ہے؟
Carbon dioxide and hydrogen
Carbon monoxide and nitrogen
Carbon monoxide and hydrogen
Carbon dioxide and nitrogen
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Explanation
Water gas is a mixture of Carbon Monoxide (CO) and Hydrogen (H2) .
Water Gas is formed when steam is passed over red-hot coke.
Formula: H₂O
Boiling point: 100°C
اٹھارہ سینٹی گریڈ پر پانی کا ڈائی الیکٹرک مستقل ______ ہے؟
70
80
84
None of these
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Explanation
The dielectric constant of water at around 18°C is approximately 80 .
This high value makes water an excellent polar solvent for ionic and polar compounds.
زمین پر تازہ پانی کی کتنی فیصد موجود ہے؟
0.04%
2.5%
2.2%
3%
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Explanation
3% of Earth's water is fresh water.
2.5% of that fresh water is unavailable because it is:
Locked in glaciers and polar ice caps Present in the atmosphere and soil Too deep underground to extract affordably Only 0.5% of Earth's water is available as usable fresh water for human use.
ماحول کا سب سے سرد خطہ ______ ہے؟
Mesosphere
Stratosphere
Troposphere None of these
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Explanation
The mesosphere is the coldest layer of the atmosphere, with temperatures dropping as low as -90°C .
It lies above the stratosphere and below the thermosphere .
مندرجہ ذیل بیان الکائنس کے لئے درست نہیں ہے؟
They burn to form CO2
They do not perform Bayer's Test
They undergo addition reaction
None of these
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Explanation
They do not perform Baeyer's Test statement is not true because alkynes do perform Baeyer's Test , which detects unsaturation (like double or triple bonds).
In Baeyer's Test , potassium permanganate gets decolorized if alkynes are present, indicating a reaction.
متبادل کرنٹ کو ڈائریکٹ کرنٹ میں تبدیل کس کے ذریعے کیا جاتا ہے؟
Anemometer
Battery
Rectifier
None of these
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Explanation
A rectifier is an electrical device that converts Alternating Current (AC) into Direct Current (DC).
It works by allowing current to flow only in one direction using diodes.
زمین اور ماحول پر پانی سمیت زمین کے تقریبا %50 پرت ______ ہے؟
Oxygen
Salts
Plasma
None of these
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Explanation
Priestly discover oxygen in 1776 .
Oxygen makes up about 46-50% of the Earth's crust by weight, mainly in the form of oxides and silicates .
It is also a major component of water (H₂O).
It is abundant in the atmosphere as O₂ .
موسمیات کا بانی کس کو سمجھا جاتا ہے؟
Einstein
Plato
Aristotle
None of these
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Explanation
Aristotle is widely considered the founder of meteorology .
He first used the term " meteorology " in the fourth century BC , although his work on weather was based on observation and lore rather than modern scientific methods.
ہوا کی توانائی ______ توانائی ہے۔
Potential
Transverse
Kinetic
None of these
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Explanation
The wind is used to produce electricity by converting the kinetic energy of air in motion into electricity.
Wind energy is the energy obtained from the force of the wind.
The unit of wind is: joule
زمین کی تہہ میں سب سے زیادہ کونسا عنصر پایا جاتا ہے؟
Carbon Dioxide
Ozone
Oxygen
None of these
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Explanation
Most abundant element in Earth crust is Oxygen.
Oxygen in the crust is (46.1%).
The chemical formula of oxygen (dioxygen) is O 2 .
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List of 10 Most Abundant Elements in the Earth's Crust
Sr# Element Abundance percent by weight 1 Oxygen 46.10% 2 Silicon 28.20% 3 Aluminum 8.23% 4 Iron 5.63% 5 Calcium 4.15% 6 Sodium 2.36% 7 Magnesium 2.33% 8 Potassium 2.09% 9 Titanium 0.57% 10 Hydrogen 0.14%
