PPSC Everyday Science MCQs

The Moon's gravity creates tidal bulges in Earth's oceans.
The Sun modifies the tidal range according to alignment.

Deforestation removes tree cover for farming, timber, or development.
It can reduce biodiversity and increase erosion.

Earth completes one rotation in about 24 hours.
The side facing the Sun experiences daylight.

Roots physically hold soil together.
Vegetation also reduces the impact of rain and surface runoff.

Earth's axis is tilted relative to its orbital plane.
This changes day length and solar intensity through the year.

Renewable resources are naturally replaced relatively quickly.
Examples include sunlight, wind, and flowing water.

Mercury has the smallest orbit around the Sun.
It completes a revolution in about 88 Earth days.

Photovoltaic materials release charge carriers when illuminated.
The device generates direct electric current.

Hydropower turbines are driven by flowing or falling water.
Generators convert the turbine's motion into electricity.

Earth's internal heat warms rocks and underground water.
It can provide heating or generate electricity.

Greenhouse gases slow the escape of heat to space.
The natural effect keeps Earth habitable, but added gases increase warming.

Coal, oil, and gas release stored carbon when burned.
The resulting carbon dioxide contributes to climate change.