Space and universe

Approximately how long does it take for the Moon to make one complete orbit of the Earth?

• 24 hours

• 1 month

• 1 season

• 1 year

The energy generated in stable stars comes from nuclear reactions. Which type of reaction occurs in the Sun?

• Helium nuclei break up to give hydrogen nuclei.

• Helium nuclei join together to form hydrogen nuclei.

• Hydrogen nuclei break up to give helium nuclei.

• Hydrogen nuclei join together to form helium nuclei.

Two quantities define the Hubble constant H0. ● the speed at which the galaxy is moving away from the Earth v ● the distance of the galaxy from the Earth d What is the relationship between v and d and what is the current estimate for H0?

• v is proportional to d, H0= 2.2 × 10 ^(–18) /s

• v is proportional to 1/d, H0= 2.2 × 10 ^(–18) /s

• v is proportional to d, H0= 3.0 × 10^8 m / s

• v is proportional to 1/d, H0=3.0 × 10^8 m / s1

The Sun radiates most of its energy in three regions of the electromagnetic spectrum. In the pie chart, region 1 is infrared radiation and region 2 is visible radiation. What is region 3?

• microwave

• radio

• ultraviolet

• X-ray

The table gives data about four planets in our Solar System. What are planets X and Y?

• Mars Saturn

• Mars Neptune

• Mercury Saturn

• Mercury Neptune

Which statement about the Solar System is correct?

• All the planets are rocky.

• Only the Earth has a moon.

• Pluto is a dwarf planet.

• There are many stars in the Solar System.

Comets are bodies which orbit the Sun in the Solar System. What is the shape of the orbit and how is the Sun positioned within the orbit?

• circular, centre of orbit

• circular, not at centre of orbit

• elliptical, centre of orbit

• elliptical, not at centre of orbit

What is the definition of the Hubble constant?

• the ratio of the speed at which a galaxy is receding from the Earth to its distance from the Earth

• the value of the change in wavelength of the galaxy’s starlight due to redshift

• the constant used to represent the rate of expansion of the Universe in all directions

• the estimated constant equal to the age of the Universe

Which row about the orbits of the Earth and the Moon is correct?

• Earth-1 day,

  Moon- 30 days

• Earth-30 day,

  Moon- 1 day

• Earth-365 days,

  Moon-1 day

• Earth-365 days,

  Moon-30 days

Which statement about the life cycle of a star is correct?

• All stars eventually run out of hydrogen as fuel.

• A red giant forms a planetary nebula with a supernova at its centre.

• A white dwarf star eventually forms a black hole.

• Most stars expand and form protostars.