Science MCQs

An object in freefall is accelerating downward at 'g'. Since there is no normal force acting against gravity it feels weightless.

There are 88 officially recognized constellations that cover the entire celestial sphere.

As Earth revolves around the Sun our night-time view of space changes allowing us to see different parts of the sky and different constellations at different times of the year.

Any object with mass generates a gravitational field. The Earth's large mass creates a significant gravitational field that pulls objects toward its center.

Gravitational force is inversely proportional to the square of the distance. Doubling the distance reduces the force to a quarter.

The Earth is slightly flattened at the poles. An object is closer to the Earth's center at the poles so 'g' is slightly higher increasing its weight.

While revolution causes seasons the daily tides are primarily influenced by the Moon's gravity the Sun's gravity and the Earth's rotation.

Perigee is the point in the orbit of the Moon or a satellite where it is nearest to the Earth.

The Earth's rotation causes most places to experience two high tides and two low tides each day as they move through the tidal bulges.

In summer the hemisphere is tilted towards the Sun resulting in longer daylight hours and more direct (concentrated) sunlight.