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۔
Pentane
Hexane
Octane
None
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Explanation
Octane is a hydrocarbon and an alkane with the chemical formula C₈H₁₈, and the condensed structural formula CH₃(CH₂)₆CH₃.
Octane has many structural isomers that differ by the amount and location of branching in the carbon chain
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RY 23-12-2022
Speed
Kinetic energy
Potential energy
Acceleration
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Explanation
When a bullet is fired vertically upwards it loses kinetic energy and gains potential energy .
جب جوہری توانائی کو بجلی کی پیداوار کے لیے استعمال کرنے کا ارادہ کیا جاتا ہے، جوہری ری ایکٹر میں خارج ہونے والے ممکنہ طور پر تباہ کن نیوٹران کس کے ذریعے جذب ہوتے ہیں
Cubical blocks of steel Long rods of CD
Heavy water
A pile of blocks made of graphite
Both A and C
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Explanation
When nuclear energy is intended to be harnessed for the generation of electricity, potentially
destructive neutrons released in a nuclear reactor are absorbed by Cubical blocks of steel Long rods of CD and A pile of blocks made of graphite
Carbon
Gold
Silver
Platinum
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Explanation
Diamond is composed of a single element of carbon
It is the arrangement of the C atoms in the lattice
Diamond is a solid form of pure carbon with its atoms arranged in a crystal.
ٹیبل نمک کس کا کیمیائی نام ہے
sodium chloride
potassium chloride
oxygen
sodium phosphate
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Explanation
Table salt is the granulated white salt seen in most saltshakers. Table salt is typically mined from underground deposits.
Table Salt is commonly known as Sodium chloride
MUG 11-12-2022
الیکٹرانکس میں سولڈرنگ آپریشنز میں عام طور پر کون سا مواد سولڈر کے طور پر استعمال ہوتا ہے؟
Iron and tin
Lead and tin
Aluminum and lead
Aluminum and iron
None of these
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Explanation
Lead and tin are the materials generally employed as solder in soldering operations in electronics.
Solder is used for joining two metal surfaces together. Solder is a mixture of lead and tin.
MUG 11-12-2022
ہمارے جسم میں توانائی کا سب سے اہم ذریعہ کیا ہے؟
Carbohydrates
Protein
Fats
Vitamins
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Explanation
Carbohydrates are the major source of energy in our body
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Carbohydrates are the main energy source of the human diet .
The metabolic disposal of dietary carbohydrates is direct oxidation in various tissues, glycogen synthesis (in the liver and muscles), and hepatic de novo lipogenesis.
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The energy of the sun is the original source of most of the energy found on earth.
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ND29-11-2022
10
12
13
14
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Explanation
The atomic number of sodium is 11. It has 11 electrons. It loses one electron to form sodium ion.
N a → N a + + e −
Then the number of electrons in sodium ion is 1 1 − 1 = 1 0 .
3,2,1,5,4
4,2,1,5,3
3,4,1,5,2
None
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Explanation
Sand is cheaper than Iron, Iron is cheaper than Gold,Gold is cheaper than diamond and diamond is cheaper than platinum
potassium
radium
polonium
uranium
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Explanation
polonium is not a radioactive element **** It is found in the form of an elemental state having allotropes with colors black, red and grey . Thus it is also a non-radioactive element. Polonium is a group of 16 elements with atomic number 84 and an atomic mass of 204. *** The common 4 radioactive elements are Uranium, Radium, Polonium, Thorium, etc.