Which of the following binoculars would be best for observing very faint comets among the stars?
A) 7 × 60
B) 12 × 50
C) 5 × 20
D) 10 × 35
E) 8 × 50
A
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Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the force between these two wires?
A) It is doubled. B) It stays the same. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of 2.
Which of the following statements about Titan is not true?
A) It is the coldest moon in the solar system. B) It may have an ocean of liquid ethane. C) Its surface is hidden from view by its thick atmosphere. D) Its temperature is too cold for liquid water to exist. E) Its atmosphere is mostly nitrogen.
What is the least count of your hand calibrated thermometer?
Why are lunar eclipses more commonly seen than solar eclipses?
A) Lunar eclipses occur at night and are easier to see. B) The Moon goes around the Earth faster than the Earth goes around the Sun. C) Earth casts a bigger shadow than the Moon. D) The tilt of the Moon's axis is smaller than the Earth's. E) The Moon is much closer to Earth than to the Sun.