کولمب کا قانون ______ کہتا ہے؟

1. Force between two point charges is directly proportional to the sum of the charges and inversely proportional to the square of the distance between them
2. Force between two point charges is directly proportional to the product of the charges and the square of the distance between them
3. Force between two point charges is inversely proportional to the product of the charges and directly proportional to the square of the distance between them
4. Force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them

Explanation

• Coulomb's Law states that the magnitude of the electrostatic force (F) between two point charges (q1 and q2) is directly proportional to the product of the charges and inversely proportional to the square of the distance (r) between them.
• Mathematically, this is expressed as: F ∝ (q1 × q2) / r².
• This law describes the relationship between electric charges and the force they exert on each other.

Last verified on 22-05-2026

Related MCQs

A light year is a _____ unit.

ایک لائٹ ایئر ایک _____ اکائی ہے۔

1. Speed
2. Time
3. Length
4. None of these

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

• A light year is the distance that light travels in one year.
• It is used to measure vast distances in space.
• Light moves at approximately 299,792 km per second.
• One light year ≈ 9.46 trillion kilometers (5.88 trillion miles).

Last verified on 17-03-2026

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Instrument used for measuring the thickness/purity of milk is called what?

وہ اوزار جس سے دودھ کا گاڑھا پن یا خالص پن ناپا جاتا ہے، اسے کیا کہتے ہیں؟

1. Lucimeter
2. Lactometer
3. Barometer
4. Hydrometer

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

• A lactometer is used to measure the purity and density (thickness) of milk.
• It checks if milk has been adulterated with water by measuring specific gravity.
• Works on the principle of buoyancy.
• Pure milk specific gravity: 1.028–1.032 at 15°C

Last verified on 16-03-2026

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In medical and industrial applications, laser is preferred over ordinary light mainly because its beam is?

طبی اور صنعتی استعمال میں لیزر کو عام روشنی پر کیوں ترجیح دی جاتی ہے، خاص طور پر اس لیے کہ اس کی شعاع کیسی ہوتی ہے؟

1. Multicolored and diffuse
2. Narrow and highly focused
3. Weak and scattered
4. None of these

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

• Laser light is highly directional and concentrated in a small area.
• This allows precise cutting in surgery and accurate industrial work.
• Ordinary light spreads in many directions, but laser does not.

Last verified on 25-05-2026

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Which radioactive emission is described as a stream of fast-moving charged particles lighter than alpha particles?

کون سی تابکار شعاعیں تیز رفتار چارج شدہ ذرات کا ایک سلسلہ ہوتی ہیں جو الفا ذرات سے ہلکی ہوتی ہیں؟

1. Beta radiation
2. X-radiation
3. Gamma radiation
4. None of these

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

• Beta particles (β) are fast-moving electrons or positrons.
• They are lighter than alpha particles and carry a charge.
• They have moderate penetrating power compared to alpha and gamma rays.

Last verified on 25-05-2026

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In quantum theory, the smallest discrete amount in which radiant energy is emitted or absorbed is called?

کوانٹم نظریہ میں وہ سب سے چھوٹی مقدار جس میں تابکاری توانائی خارج یا جذب ہوتی ہے اسے کیا کہتے ہیں؟

1. Nucleus
2. Molecule
3. Quantum
4. None of these

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

• In Quantum Physics, energy is not continuous but comes in small packets.
• The smallest discrete packet of energy is called a quantum.
• Light energy is emitted or absorbed in the form of photons (quanta of light).

Last verified on 25-05-2026

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