Which of the following is reversible? (Changes back to the original state).

Which of the following is irreversible? (Cannot change back to original state).

Which of the following circuits makes the bulb light up?

Days and nights  

12 months

Salt, sugar, and coffee dissolve faster in cold water.

The Sun is the brightest source of light.

When …………………… is heated, it turns back to water again.

The aluminum and …………………… need a lot of heat to change into a liquid.

which one can change from solid to liquid?

Which one is soluble?

It takes ............... days for the Earth to make one orbit of the Sun.

Light from the Sun takes .......... minutes to reach the Earth.

Earth moves ........... around the Sun.