Explanation

Non-electrolytes are substances that do not dissociate into ions in solution, so they do not conduct electricity.

Examples include sugar and pure water.

Explanation

Sodium carbonate (Na₂CO₃) is commonly known as soda ash.

It is used in glass making, detergents, and water softening.

Explanation

• When an electron jumps from a higher energy level to a lower energy level, it radiates energy.
• The electron releases this excess energy in the form of a photon (electromagnetic radiation) as it moves to a more stable, lower-energy state. 
•  Lower-Radiates/Emits energy.
• Lower- Higher: Absorbs energy. 

Last updated question by NA on 28 April 2026

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

Gauss → Unit of magnetic induction (CGS system)

Tesla → SI unit of magnetic induction

Weber/Ampere·meter → This is a unit of magnetic permeability, not magnetic induction

Explanation

Using the formula for parallel resistance: 1/R_eq = 1/R1 + 1/R2

1/24 = 1/40 + 1/R

Solving for R gives R = 60Ω.

Explanation

Explanation

Waheed runs 9 miles in 1 hour.

We need to find how many hours it will take him to run 108 miles.

= 108 ÷ 9 = 12 hours

Explanation

We are given the equation:

w = (2/3)t + 6

and asked to find w when t = 12.

Step-by-step:

w = (2/3 × 12) + 6

w = 8 + 6

w = 14

Explanation

42 ÷ 7 = Rs. 6 per folder

50 ÷ 6 ≈ Rs. 8.33 per folder

56 ÷ 8 = Rs. 7 per folder

72 ÷ 9 = Rs. 8 per folder