Explanation

Happy means خوش

Hapless means بے بس

Unlucky means بد قسمت

Lucky means خوش قسمت 

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Last updated by NA on 25-April-2026

Explanation

• In liquids and gases, heat is mainly transferred by convection.
• Convection involves the movement of particles carrying heat from one place to another.
• Essential for weather patterns, ocean currents, and heating systems.

Last verified on 19-03-2026

Explanation

• A knife is a tool used to cut, similarly a pen is a tool used to write.
• This is an example of a tool-to-function analogy.

Last verified on 15-02-2026

Explanation

The RMS (Root Mean Square) value of an AC waveform is the effective or equivalent DC value that produces the same heating effect (power dissipation) in a resistor as the AC signal

 It is calculated as the square root of the mean of the squares of instantaneous values over one cycle.

For a sinusoidal AC wave:

• At 0°, the instantaneous value is zero (minimum).

• At 90°, the instantaneous value reaches its maximum.

Therefore, the RMS-related peak behavior corresponds to maximum at 90° and minimum at 0°.

Last updated 14-feb-2026

Explanation

70 × 70 = 4900, and 4900 ÷ 100 = 49.

Last updated 14-feb-2026

Explanation

Silicon is widely used in semiconductors because:

• It is abundant in nature.
• It has suitable electrical properties.
• It has excellent thermal stability.
• It forms a stable oxide layer (SiO₂) useful in device fabrication.

Note: Germanium was used earlier, and gallium nitride is used for high-power or high-frequency devices, but silicon remains the standard.

Last updated 14-feb-2026

Explanation

The total percentage of silicon in the Earth's crust is approximately 27.7% by weight.

Additional information

Abundance: Second most abundant by weight (~ 28%) and volume (0.9%).

Occurrence: It does not exist in pure form in nature, but rather as oxides (e.g., sand, quartz) and silicates (e.g., feldspar, mica, clay).

Last updated 14-feb-2026

Explanation

Step 1: Find the pattern (differences)

6 − 2 = 4

12 − 6 = 6

20 − 12 = 8

30 − 20 = 10

42 − 30 = 12

The differences increase by 2 each time:

4, 6, 8, 10, 12, 14

Step 2: Find the next term

Next number = 42 + 14 = 56

Explanation

When the velocity of an object is doubled, its kinetic energy becomes four times its original value.

This is because the kinetic energy formula (KE = 1/2 * mv²) shows that kinetic energy is directly proportional to the square of the velocity.

Therefore, doubling the velocity (2v)² results in a fourfold increase in kinetic energy. 

kinetic energy (ke) = ½mv²  

if velocity is doubled → ke = ½m(2v)² = ½m(4v²) = 4 times the original.

Explanation

Just as gloves are worn on hands, shoes are worn on legs (specifically feet).

This is a relationship of covering or wearing.