1Which is the main element in a nebula? helium, carbon, nitrogen or hydrogen
2The huge explosion that happens as a star dies is a ........ . pulsar, neutron star, supernova or black hole
3Which is the correct order in the life cycle of a star? nebula → protostar → star → red giant → supernova → black dwarf; nebula → protostar → star → supernova → red giant → black hole; nebula → protostar → star → red supergiant → supernova → black hole; nebula → protostar → star → red supergiant → supernova → white dwarf
4Which of these is a fact about the universe? The universe has spread out only up to a fixed limit. All the matter and energy of the universe came from one common mass. The amount of energy in the universe keeps changing. Energy decreases when matter in the universe is destroyed.
5Write the difference between a protostar and a star.
6Write the difference between a red giant and a red supergiant.
7Write the difference between a nova and a supernova.
8Give reason: a nebula is also called a stellar nursery.
9Give reason: stars are not all the same colour.
10Give reason: a black hole cannot be seen.
11Give reason: the gas giant Jupiter is also called a failed star.
12What is a nebula?
13What is a black hole?
14Explain the life cycle of a star with a diagram.
15What will happen to the Sun when its fuel finally runs out? Explain.
16Write some scientific facts about the universe.
17Why are units such as the astronomical unit and the light year important in astronomy?
18Describe the state of astronomy studies in Nepal.
19Discuss the role of NASA in the development of astronomy.
20Write the four main aims of NAST.
21What are the main functions of the IAU?
22Why is Pluto no longer called a planet?
23Why are telescopes placed in space, and how is the James Webb Space Telescope different from Hubble?
24State the principle of conservation of energy and explain it using burning firewood.