Which of the following happens during a new moon

Moon is invisible to us during a new moon day.

Explanation:

Moon is earth's only satellite which revolve the Earth at specific path. Moon complete its one revolution of earth in the period of 29.53 days. During a new moon day, moon is between the earth and the sun, moon travelled at the first lunar phase in their revolutionary motion. During full moon day, Earth is between the Sun and Moon due to this position moon is clearly visible to us.

less than half of the moon

Explanation:

If you go outside during a new moon, and you look at the sky, you can only see a small sliver of the moon.