MAJOR ELEMENTS AND METALS
Major Elements and Metals
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
زمین پر پایا جانے والا سب سے عام عنصر کونسا ہے؟
Hydrogen
Oxygen
Nitrogen
None of these
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Explanation
Aluminum is the most abundant metal in the Earth's crust , and the third most abundant element therein, after oxygen and silicon.
MOST IMPORTANT KEY POINTS :
Most abundant elements found in air are? (1) Nitrogen (2) Oxygen (3) Argon
Most abundant elements found in earth’s crust are? (1) Oxygen (2) Silicon (3) Aluminum
Most abundant elements found in Universe are? (1) Hydrogen (2) Helium (3) Oxygen
Most abundant elements found in Human Body are? (1) Oxygen (2) Carbon (3) Hydrogen
پانی کی زیادہ سے زیادہ کثافت _____ ہے؟
2°C
3°C
4°C
5°C
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Explanation
Water has maximum density at 4°C .
When Water is in its Solid form (Ice) below 0°C .
ایکس رے کی گھسنے والی طاقت ان کے ______ پر منحصر ہے؟
Source
Frequency
Applied voltage
None of these
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Explanation
The penetration power of the X-rays depends on the wavelength and frequency of X-rays
The penetration power of the X-rays will be more when the energy of the X-ray i s more.
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Related Question:
X-rays have been discovered by __________?
اس عنصر کا نام بتائیں جو سولر سیلز اور ٹرانجسٹر بنانے کے لیے استعمال ہوتا ہے؟
Germanium
Iron
Silicon
None of these
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Explanation
Silicon (Si) is the element most commonly used to fabricate solar cells and transistors.
Silicon is a semiconductor material that is widely used in the production of electronic components, including:
Solar cells (photovoltaic cells) Transistors Microprocessors Diodes
صابن ____ کی وجہ سے کپڑوں سے گندگی کو دور کرتے ہیں۔
Capillary action
Osmosis
Diffusion
Lowering of inter-facial tension
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Explanation
When the soap is in the form of micelles then it has the ability to clean the oily dirt which gets accumulated at the centre.
These micelles remain as colloidal solutions.
Therefore, the dirt from the cloth is easily washed away.
مندرجہ ذیل میں سے کون زیادہ لچکدار ہے؟
Steel
Rubber
Glass
Sponge
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Explanation
Steel is most elastic among the rubber, steel, glass and sponge.
Steel having the most steep linear stress-strain curve among all.
A stiffer material will have a higher elastic modulus.
حل کا غیر جانبدار پی ایچ ____ ہے؟
1
7
14
-7
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Explanation
As this diagram shows, pH ranges from 0 to 14 , with 7 being neutral.
pH less than 7 are acidic .
pH greater than 7 are alkaline .
Solid oxygen
Solid Nitrogen
Solid Carbon dioxide
None of these
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Explanation
Dry ice is a solid form of carbon dioxid e .
...
"Dry ice" is solid, frozen carbon dioxide, which is sublimated at a chilly -78.5 °C (-109.3°F).
Dry ice is used primarily as a cooling agent.
Dry ice does not melt into a liquid when heated instead, it changes directly into a gas.
ND16-8-2023
Iron
Gold
Silver
None of these
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Explanation
The most stable metals , such as gold and platinum , do not corrode easily
because they do not lose electrons easily.
while
Metals placed higher in the reactivity series, such as iron, zinc, etc ., get corroded very easily
ایٹم بم کن اصولوں پر مبنی ہے
Radioactivity
Nuclear Fission
Nuclear Fusion
Both A & B
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Explanation
An atomic bomb is based on the nuclear reaction known as nuclear fission,
A heavy atomic nucleus splits into two or more lighter nuclei, releasing a large amount of energy in an uncontrolled chain reaction.
The bombs dropped on Hiroshima and Nagasaki were examples of nuclear fission bombs , utilizing uranium-235 or plutonium-239 as the fissionable material.
