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۔
دو دھاتوں کے ملاپ کو کیا کہا جاتا ہے؟
Substance
Alloy
Metal
Non-Metal
None of these
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Explanation
A mixture of two or more metals (or a metal with non-metals) is called an alloy
An alloy is made by mixing metals.
It improves strength and durability.
Steel (iron and carbon), is an example of an alloy.
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.
مندرجہ ذیل میں سے سب سے ہلکی دھات کون سی ہے؟
Mercury
Lithium
Lead
Silver
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Explanation
Lithium is the lightest metal.
Density of 0.534 g/cm³.
It is an alkali metal,
The third element on the periodic table,
It is soft enough to be cut with a knife.
Uses: Due to its low density and high reactivity, it's used in aircraft and, famously, in the production of batteries for electric vehicles and consumer electronics.
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 .
