Explanation

اوھان جي مرضي مگر ملڻ بيحد ضروري آهي۔ جملي ۾ لفظ مگر هڪ حرف جملو آهي۔

اهو ٻن جملن يا جملي جي حصن کي ڳنڍڻ جو ڪم ڪري ٿو (يعني جوڙيندڙ يا تفريق ڪندڙ لفظ جي طور تي استعمال ٿئي ٿو)۔

Last verified on 13-03-2026

Explanation

مٺڙا لفظ ٻارن جي خاصيت ڏيکاريندو آهي، جيڪو ڪنهن شيءَ کي ننڍو ۽ پيارو ظاهر ڪري ٿو۔

اهڙو لفظ اسم تصغير ۾ اچي ٿو، جيڪو شيءِ کي نرالو يا ننڍڙو ڏيکاريندو آهي۔

Last verified on 13-03-2026

Explanation

• 1 kilogram (Kg) = 1000 grams (g)
• So, 0.2 Kg = 0.2 × 1000 g = 200 g
• Mass is a measure of matter in an object.

Last verified on 13-03-2026

Explanation

• Acceleration is not a base quantity.

The base quantities are:

• Length (L)
• Mass (M)
• Time (T)

Last verified on 13-03-2026

Explanation

• Thermodynamics studies the relationship between heat, temperature, energy, and work.

Additional information:

• First law: Energy cannot be created or destroyed (Law of energy conservation)
• Second law: Heat flows from hot to cold spontaneously
• Third law: Absolute zero cannot be reached
• Zeroth law: Establishes temperature measurement
• Applications: Engines, refrigerators, heat pumps, and power plants

Last verified on 13-03-2026

Explanation

• Conduction is the process of heat transfer through direct contact of molecules.
• In solids, especially metals, molecules vibrate and pass energy to neighboring molecules.
• No movement of the substance itself is required; only energy is transferred.

Last verified on 13-03-2026

Explanation

• A thermal conductor is a material that allows heat to pass through it easily.
• Metals like copper, aluminum, and iron are good thermal conductors.
• Thermal conduction occurs mainly in solids where particles are closely packed.
• In contrast, thermal insulators (like wood, plastic, and rubber) resist heat flow.

Last verified on 13-03-2026

Explanation

• Green plants use carbon dioxide (CO₂) from the atmosphere to make food via photosynthesis.
• In photosynthesis, CO₂ + H₂O → Glucose + O₂ (with sunlight and chlorophyll).

Last verified on 13-03-2026

Explanation

• The symbol ⁴₂He indicates helium has 2 protons (atomic number = 2) and mass number = 4.
• In a neutral atom, the number of electrons = protons, so helium has 2 electrons.

Last verified on 13-03-2026

Explanation

• The same atomic number (Z) → same number of protons
• Different mass numbers → different number of neutrons