PPSC PAST PAPERS ALL MCQS 2024 OF EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- Electromagnetic waves signals
- Electric signals
- Through satellite
- Sound waves
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Explanation
These devices use electromagnetic waves, such as radio waves and microwaves, to transmit information.
Electromagnetic waves can travel through the vacuum of space,
Which allows for communication across long distances, even with spacecraft and space agencies
- Hydrogen
- Propane
- Butane
- Methene
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Explanation
CNG (Compressed Natural Gas) is primarily composed of methane.
When comparing the burning efficiency of CNG to other gases
It is generally understood that CNG burns less efficiently than Propane
Propane has a higher energy content per unit volume compared to methane, meaning it can produce more energy when burned.
- Single inheritance
- Multiple inheritance
- Multilevel inheritance
- None of these
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Explanation
In Java, a class cannot inherit from more than one superclass to avoid ambiguity.
However, it does support single inheritance, multilevel inheritance, and hierarchical inheritance.
To achieve some aspects of multiple inheritance, Java uses interfaces, allowing a class to implement multiple interfaces.
- Banana
- Butter
- Milk
- None of these
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Explanation
The components that is rich in fat are: Butter
Butter is primarily made from fat, particularly milk fat, and is much richer in fat compared to bananas and milk.
ویلڈنگ میں کون سی گیس استعمال ہوتی ہے۔
- Hydrogen
- Nitrogen
- Acetylene
- Ammonia
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Explanation
Oxy-acetylene welding is a very common welding process.
Gases used in welding and cutting processes include:
- shielding gases such as carbon dioxide, argon, helium, etc.
- fuel gases such as acetylene, propane, butane, etc.
oxygen, used with fuel gases and also in small amounts in some shielding gas mixtures
کان کا کون سا حصہ سماعت سے تعلق رکھتا ہے
- Cochlea
- Ossicle
- Pinna
- Eardrum
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Explanation
The part of the ear that primarily belongs to hearing is the Cochlea.
The cochlea is responsible for converting sound vibrations into neural signals that the brain interprets as sound.
- Electronic wave
- Mechanical wave
- Water wave
- None of these
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Explanation
Sound, a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium.
- Joseph Priestley
- John Pemberton
- Coca-Cola
- None of these
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Explanation
Joseph Priestley invented soda water in 1767 by infusing water with carbon dioxide.
His method laid the foundation for carbonated beverages.
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.
گرمی کا استعمال کرتے ہوئے بڑے ہائیڈرو کاربن کو چھوٹے مالیکیولز میں توڑنے کے عمل کو _____ کہا جاتا ہے؟
- Catalytic cracking
- Thermal cracking
- Hydrolysis
- None of these
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Explanation
Thermal cracking is a process in which high temperatures are used to break down large hydrocarbon molecules into smaller, more useful molecules.
Such as gasoline and diesel.
This process is widely used in the petroleum industry.