Explanation

Major means صحت کے لئے ایک سنگین یا شدید خطرہ

Serious means صحت کے لئے ایک سنگین یا شدید خطرہ

Explanation

The equation 3(4x) = (4x)3 shows that the order of multiplication does not affect the result.

This is the Commutative Property of Multiplication, where a × b = b × a.

Explanation

Explanation

When light passes from a rarer to a denser medium, its speed and wavelength decrease, but the frequency stays the same.

This is because the source determines frequency, and it doesn’t change with medium.

Explanation

First law of motion is also called the Law of Inertia.

It states that an object will stay at rest or move with constant velocity unless an external force changes its state.

Explanation

Explanation

"Before entering" is the correct phrase, indicating the action should happen prior to entering.

It properly links with the verb "ask permission" to show timing and respect.

Explanation

Deafening means انتہائی اونچی آواز میں

Quiet means بہت کم یا کوئی شور نہیں ہے

Explanation

Explanation

Sodium is a metal, and metallic bonding involves positive ions in a lattice surrounded by a sea of free (delocalized) electrons.

This structure gives metals properties like electrical conductivity and malleability.