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۔
درجہ حرارت کی ایس آئی یونٹ کیا ہے؟
- Kelvin
- Centigrade
- Fahrenheit
- None of these
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Explanation
The SI unit of temperature as per the International System of Units is Kelvin.
It is represented by the symbol K.
Note:
Celsius is currently a derived unit for temperature in the SI system, Kelvin is the base unit.
ایک امپیر گھنٹے _____ کی اکائی ہے؟
- Power
- Current
- Quantity of charge
- None of these
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Explanation
Ampere-hour (Ah) measures the total electric charge transferred by a current of one ampere flowing for one hour.
It is widely used to express the capacity of batteries.
رفتار کی ایس آئی یونٹ کیا ہے؟
- m²-sec
- m/s
- m·s⁻¹
- Both B and C
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Explanation
Velocity SI units: meters per second (m/s or m·s⁻¹).
This unit is derived from the SI units for displacement (meter) and time (second),
Velocity is defined as the rate of change of displacement over time (displacement/time).
لینس کی طاقت کی اکائی کیا ہے؟
- Meter
- Watt
- Diopter
- None of these
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Explanation
The power of the lens is the reciprocal of focal length.
The SI unit is dioptre.
Dioptre (D)
Power of lens = 1/ focal length in meter.
- Kg
- Km
- W
- N
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Explanation
The Metric System of Measurements uses the mass units: gram (g), kilogram (kg), and tonne (t). 1000 g = 1 kg. 1000 kg = 1 tonne.
Mass was first defined in 1795
Symbol: M
الیکٹرک فلوکس کا ایس آئی یونٹ _____ ہے؟
- Newton per coulomb (N/C)
- Newton meter² per coulomb (N·m²/C)
- Coulomb per meter² (C/m²)
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Explanation
Electric flux is given by Φ = E × A, so its SI unit is (N/C) × m² = N·m²/C.
It represents the number of electric field lines passing through a surface.
ورک کا ایس آئی یونٹ _____ ہے؟
- Nm²
- Ns
- Nm
- None of these
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Explanation
Work is defined as force × displacement, so its unit is Newton × meter (Nm).
In SI units, 1 Nm = 1 joule (J), the standard unit of work.
امپیڈنس کا ایس آئی یونٹ کیا ہے؟
- Henry
- Hertz
- Ampere
- Ohm
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Explanation
The SI unit of impedance is the ohm (Ω).
Impedance, like resistance, is measured in ohms.
It can be represented as a complex number.
انڈکٹنس کی پیمائش کی اکائی کیا ہے؟
- Henry
- Watt
- Light
- Tesla
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Explanation
The unit of measurement for inductance is the henry (H).
It is the International System of Units (SI) unit.
The henry is named after Joseph Henry, the physicist who independently discovered inductance.
- Galvanometer
- Ammeter
- Voltmeter
- None of these
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Explanation
- A voltmeter measures the potential difference (voltage) between two points in a circuit.
- It is always connected in parallel to the component.
- The SI unit of potential difference is the Volt (V).
- Potential difference is the work done per unit charge to move a charge between two points.
- Formula: V = W / Q
- V = potential difference (volts)
- W = work done (joules)
- Q = charge (coulombs)
- A voltmeter has high resistance so it doesn't draw current from the circuit.
