Explanation

گردے دراصل لوبیئے کی شکل کے دو عدد اخراجی اعضاء ہیں جو خون میں پیدا ہوتے رہنے والے غیر ضروری اجزاء (بطور خاص یوریا) کو خون سے الگ کر کے یا چھان کر، پانی کے ساتھ پیشاب کی شکل میں جسم سے خارج کردیتے ہیں۔

Explanation

Fat soluble 

Sources include green vegetables, milk and its products, liver eggs and especially in carrots.

leading cause of blindness in children worldwide

Explanation

The charges of Proton, Electron, Neutron respectively are:

• Proton: Positive charge (+1)
• Electron: Negative charge (-1)
• Neutron: Neutral charge (0)

Explanation

 While an electron always has an electric field due to its charge, its spin generates a magnetic field.

The motion of a charged particle (even if it's just spinning) creates a magnetic field.

Explanation

This refers to the loss of water through the cuticle, the waxy layer on the surface of leaves. 

Sources consistently state that approximately 5-7% of total transpiration occurs via the cuticle. 

Explanation

The empirical formula of glucose is CH2O.

This represents the simplest whole-number ratio of the elements in glucose.

It has a molecular formula of C6H12O6.

Explanation

The average translational kinetic energy of a molecule in an ideal gas is given by the formula:

E=3/2​kT

Where:

• $k = 1.38 times 10^{-23} , text{J/K}$ (Boltzmann constant)

• T=27∘C=300K (since 27°C + 273 = 300 K)

Now calculate:

E=3​/2×1.38×10^−23×300
E=3/2​×4.14×10^−21

6.21×10^−21 J

Explanation

The Earth's South Magnetic Pole is geographically north, and the Earth's magnetic North Pole is geographically south, so free-moving magnets are always north-south.

Explanation

Many practical and proprietary methods exist to avoid plastic shrinkage cracking, including various curing methods, power floating, the use of cold water, shrinkage reducing admixtures, and fibres.

Covering concrete with plastic sheets or wet burlap is the most common practical concrete curing method.

Explanation

How is the Rainbow formed? 5 marks

Rainbow:

"A rainbow is a meteorological and optical phenomenon that is caused by the reflection, refraction, and dispersion of light in water droplets"

Color of Rianbow:

The colors of the rainbow are:

1. Red
2. orange
3. yellow
4. green
5. blue
6. indigo
7. and violet.

Rainbow formed:

• When sunlight hits a rain droplet, some of the light is reflected.
  
• The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle.
• Thus, the spectrum is separated, producing a rainbow.