Science MCQs

Precession is the slow cyclical wobble of Earth's axis over a period of about 26,000 years.

Sunspots are temporary dark spots on the Sun's photosphere that appear darker because they are cooler than surrounding areas.

Redshift is an effect where the wavelength of light is stretched shifting it towards the red end of the spectrum indicating the object is moving away.

The string tethering the car to the nail represents the Sun's gravitational pull which keeps the planets (the car) in orbit.

In the weight formula W=mg 'g' stands for acceleration due to gravity.

Weight (W) = mass (m) × gravity (g). So W = 60 kg × 10 m/s² = 600 N.

Mass is the amount of matter and remains constant regardless of location. Only weight changes.

On December 22nd the Southern Hemisphere is tilted towards the Sun receiving more direct sunlight and experiencing summer.

Spring tides occur during new and full moons when the Sun Earth and Moon are aligned resulting in the combined gravitational pull and the highest tides.

When the elevator accelerates upwards the scale must push harder to accelerate the person too showing a higher "apparent weight." The opposite happens when decelerating.