Explanation

Surface area of a cube = 6 × (edge)²  

= 6 × 5² = 6 × 25 = 150  

Last verified on 12-04-2026

Explanation

The pattern: 60, 100, 140... increases by 40 each cabin.  

That’s an arithmetic sequence: a₁ = 60, d = 40  

16th term = 60 + (16-1)×40 = 60 + 600 = 660  

Last verified on 12-04-2026

Explanation

• The in-center is the point where all three internal angle bisectors of a triangle meet.
• It is always located inside the triangle.
• The in-center is the center of the incircle (circle inside the triangle).
• It is equally distant from all sides of the triangle.

Last verified on 12-04-2026

Explanation

Degree = sum of exponents on the variables.  

For 5x²yz: 2 + 1 + 1 = 4  

Last verified on 12-04-2026

Explanation

Let Cost Price = 100  

Marked Price = 100 + 20% = 120  

Discount 15% of 120 = 18, so Selling Price = 120 - 18 = 102  

Gain = 102 - 100 = 2  

Last verified on 12-04-2026

Explanation

• The principal is the original amount of money deposited or borrowed.
• It is the base amount on which interest or profit is calculated.
• This term is commonly used in banking, loans, and investments.
• Without principal, no interest or markup can be calculated.
• It is the starting value in all financial transactions.

Last verified on 12-04-2026

Explanation

LCM of 4 and 10: multiples of 4 = 4, 8, 12, 16, 20... multiples of 10 = 10, 20...

First common multiple = 20 

Last verified on 12-04-2026

Explanation

• Stationary waves are formed due to the reflection of a wave from a rigid boundary.
• The reflected wave travels in the opposite direction and interferes with the incident wave.
• This interference produces nodes (no displacement) and antinodes (maximum displacement).
• Stationary waves do not transfer energy from one place to another.
• They are commonly observed in stretched strings and air columns.

Last verified on 11-04-2026

Explanation

AND Gate Rule:

• Output = 1 (HIGH) only when all inputs are 1 (HIGH)
• Truth condition: A = 1 AND B = 1 → Output = 1

Last verified on 11-04-2026

Explanation

• Refractive index shows how much light bends when entering a medium.
• Glass is a transparent solid with moderate optical density.
• Its refractive index is a standard value used in physics experiments.
• It is greater than water and less than diamond.
• So, the commonly accepted value for glass is around 1.5.

Last verified on 12-04-2026