Explanation

• Sublimation is the process by which a solid substance transitions directly into a gas or vapour, without going through the liquid phase, and then condenses back into a solid.
• Examples include iodine, dry ice, and naphthalene.

Last verified on 06-03-2026

Explanation

• Gases do not have a definite shape or volume.
  • They take the shape and volume of the container they are in.
  • Gases can be compressed because the particles are far apart.

Last verified on 06-03-2026

Explanation

• Non-luminous objects do not produce their own light; they are visible because they reflect light from other sources.
• The Moon is non-luminous; it reflects sunlight.
• Luminous objects like the Sun, stars, and fireflies produce their own light.

Last verified on 06-03-2026

Explanation

• A translucent object allows some light to travel through it, but scatters or absorbs some of the light, making it semi-transparent.
• Examples: Frosted glass, wax paper, and tissue paper.

Additional information:

• Transparent: Allows all light to pass through, providing a clear view. 
• Opaque: Does not allow any light to pass through.

Last verified on 06-03-2026

Explanation

• When an opaque object moves closer to the light source, the shadow becomes larger.
• This is because the light rays spread out more, increasing the shadow’s size.
• Opposite effect: Moving the object away from the light source makes the shadow smaller.

Last verified on 06-03-2026

Explanation

• A solar eclipse occurs when the Moon passes between the Sun and Earth, blocking sunlight.
  • It can be total, partial, or annular, depending on the alignment.
  • During a total solar eclipse, the day briefly becomes dark.

Last verified on 06-03-2026

Explanation

• A leap year occurs every 4 years to adjust for the extra 0.2422 days in a solar year.
• Normal year = 365 days, solar year = 365.2422 days, so 1 extra day is added in February.
• Leap year rule: Year divisible by 4

Last verified on 06-03-2026

Explanation

Top three polluted city in the World:

1. Lahore, Pakistan

2. Delhi, India 

3. Mexico City, Mexico

Source Click here

Last verified on 06-03-2026

Explanation

K2 World 2nd highest mountain

• K2 Elevation: 8,611 m
• K2 First ascent: July 31, 1954
• K2 Mountain range: Karakoram range
• K2 First ascenders: Achille Compagnoni, Lino Lacedelli
• K2 Easiest route: Abruzzi Spur

Last verified on 06-03-2026

Explanation

• First International Match: 2 August 1948, led by Ali Iqtidar Shah Dara vs Belgium, won 2–0 at 1948 London Olympics.
  • World Hockey Cup Titles (4 times): 1971, 1978, 1982, 1994
  • 1971 World Cup: Pakistan defeated Spain to become champions.
  • 1994: Pakistan won the Hockey World Cup for the last time.
  • 2012 Hockey Champions Trophy: Pakistan beat India to win bronze.

Last verified on 06-03-2026