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۔
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 .
دھاتوں کے بارے میں کون سا بیان غلط ہے؟
Metals are solid at room temperature
Metals have high melting and boiling point
Metals are good conductor of heat and electricity
Metals are shiny, ductile and malleable
Metals are dull and soft
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Explanation
The incorrect statement is : Metals are dull and soft.
Metals are typically:
Solid at room temperature Have high melting and boiling points Good conductors of heat and electricity Shiny (although some metals may have a dull appearance due to oxidation or other surface treatments) Ductile (can be drawn into thin wires or sheets) Malleable (can be pounded into shape without breaking)
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
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.
***
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.
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.
