Complete the mcq:
1 Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star has a mass just about the same as the mass of the Sun?
The star with spectral class B7
The star with spectral class F1
The star with spectral class G2
The star with spectral class M4
2 What is the correct sequence for stellar evolution?
Protostar, main sequence, white dwarf, red giant
Red giant, protostar, white dwarf, protostar
White dwarf, main sequence, red giant, protostar
Protostar, main sequence, red giant, white dwarf
3 What is the escape velocity from the surface of Mars? Mars has a mass of 6.42 x 10^23 kilograms, and Mars' average radius is 3.37 x
10^6 meters. (The carat symbol means raising to a power. So 10^6 means 10 raised to the power of 6, which is 1 million.)
5 kilometers per second
9 kilometers per second
13 Kilometers per second
17 kilometers per second
4 What is the escape velocity from the surface of Mars? Mars has a mass of 6.42 x 10^23 kilograms, and Mars' average radius is 3.37 x 10^6 meters. (The carat symbol means raising to a power. So 10^6 means 10 raised to the power of 6, which is 1 million.)
5 kilometers per second
9 kilometers per second
13 Kilometers per second
17 kilometers per second
5 Suppose a newly discovered star has a parallax angle of 0.4 seconds. How far away is this star?
0.4 parsecs
2.5 parsecs
17 parsecs
40 parsecs
6 Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star will depart the
Main Sequence first?
The star with spectral class B2
The star with spectral class F7
The star with spectral class G9
The star with spectral class K8
7 Pollux is a star with spectral class K0. Its absolute magnitude is +0.8, and its apparent magnitude is +1.16. How far away is Pollux?
4.5 parsecs
11.8 parsecs
19.7 parsecs
27.4 parsecs
8 Suppose a force of 51 Newtons is applied to an object with mass of 17 kilograms, initially at rest. How fast will it be moving 5 seconds later?
17 meters per second
9.81 meters per second
27 meters per second
15 meters per second
9 An astronaut has a mass of 65 kilograms at the surface of the Earth? What is his weight at the surface of the Earth?
65 kilograms
374 Newtons, or 183 lb
638 Newtons, or 143 lb
529 Newtons, or 179 lb
10 The astronaut goes to the Moon? What is his mass at the surface of the Moon?
143 lb
24 lb
65 kilograms
24 kilograms
11 Suppose the red shift of a galaxy indicates that the galaxy is moving away from us at 295 kilometers per second. Using Hubble's Law and the current estimate of Hubble's constant, about how far away is this galaxy?
2.7 Megaparsecs
4.2 Megaparsecs
6.1 Megaparsecs
9.5 Megaparsecs
12 Why does Mercury experience extreme high and low temperatures between daytime and nighttime?
Its dense atmosphere creates a runaway greenhouse.
It has virtually no atmosphere to moderate temperatures over the globe.
It is so close to the Sun.
Mercury has no axial tilt, with its equator always exposed to direct sunlight.
13 What process takes place within stars to generate the tremendous amount of energy?
nuclear fusion
nuclear fission
neutrino - anti-neutrino annihilation
gravitational collapse
14 Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star has the smallest mass?
The star with spectral class A2
The star with spectral class F9
The star with spectral class G7
The star with spectral class M3
15 Suppose a star's surface temperature is 14,000 K. At what wavelength will this star emit the most light?
852 nanometers
659 nanometers
514 nanometers
207 nanometers