INTERNATIONAL SYSTEM OF UNITS (SI)
International System of Units (SI)
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
سی جی ایس سسٹم میں ، لمبائی ، بڑے پیمانے پر اور وقت کی ایس آئی یونٹ کیا ہیں؟
- Centimeter, Kilogram, Minute
- Meter, Kilogram, Second
- Centimeter, Gram, Second
- None of these
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Explanation
SI (International System of Units) uses meter for length, kilogram for mass, and second for time.
CGS uses centimeter, gram, and second.
- Energy
- Joule
- Mass
- Velocity
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Explanation
The SI unit of work is the joule (J), which is the same unit used for energy.
Energy is found in many things, and thus, there are different types of energy.
All forms of energy are either kinetic or potential.
- Time
- Length
- Weight
- Energy
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Explanation
A foot-pound is a unit of work or energy
Specifically, it represents the amount of work done when a force of one pound moves an object one foot in the direction of the force.
Physical Quantity/ Unit
Work/Energy: foot-pound (ft-lb)
Force: pound (lb)
Distance: foot (ft)
سی جی ایس سسٹم میں بڑے پیمانے پر اکائی ____ ہے؟
- Meter
- Gram
- Pound
- None of these
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Explanation
In the C.G.S system (Centimeter-Gram-Second), the unit of mass is gram.
This system uses centimeter for length and second for time.
- Mole
- Kelvin
- Candela
- Ampere
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Explanation
The candela (cd) is the SI unit for luminous intensity, which measures the perceived brightness of a light source.
Mole (a): This is the SI unit for the amount of substance.
Kelvin (b): This is the SI unit for temperature.
Ampere (d): This is the SI unit for electric current.
ایس آئی سسٹم میں مادے کی مقدار کی اکائی _____ ہے؟
- Liter (L)
- Mole (mol)
- Gram (g)
- Kilogram (Kg)
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Explanation
- The mole (mol) is the SI unit for the amount of substance.
- 1 mol = 6.022 × 10²³ elementary entities (Avogadro's number)
- One of the 7 base SI units (adopted 1971)
- Applies to atoms, molecules, ions, etc.
- Redefined in 2019 (based on fixed Avogadro constant)
- Links microscopic particles to grams via molar mass.
اسٹیل _____ میں ماپا جاتا ہے؟
- Kilograms
- Litres
- Meters
- None of these
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Explanation
Steel, being a solid metal, is measured by weight.
The standard unit for measuring steel is kilograms or tons, depending on the quantity.
- Ohm
- Ohm-meter⁻¹
- Ohm-meter
- Mho
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Explanation
The SI unit of conductance is the Siemens (S).
It is the reciprocal of resistance, which is measured in ohms (Ω).
Therefore, 1 Siemens is equal to 1/ohm.
The term "mho" is also sometimes used as a unit of conductance, but Siemens is the standard SI unit.
مندرجہ ذیل میں سے کون سا ویکٹر کی مقدار نہیں ہے؟
- Work
- Mass
- Distance
- All of these
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Explanation
Work, mass and distance are scalar quantities because they have magnitude but no direction, but they are not vector quantities.
Vector Quantities: Velocity, momentum, torque, acceleration, weight, displacement.
Scalar Quantities: Work, distance, speed, mass.
آئنائزیشن کی صلاحیت کی اکائی _____ ہے؟
- Debye
- eV or kJ/mol
- Angeston
- None of these
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Explanation
Ionization energy (potential) is measured in:
- Electron volts (eV) (for single atoms).
- Kilojoules per mole (kJ/mol) (for molar quantities).
