physics : class11 Sun-Planet Line : Second Law of Kepler : Gravitation MCQ Questions and Answers
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Sun-Planet Line
MCQ questions and answers.
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MCQ Questions
1. According to Kepler's second law, the line joining a planet and the Sun sweeps out
A.
equal areas in equal intervals of time
B.
equal distances in equal intervals of time
C.
equal angles in equal intervals of time
D.
unequal areas in equal intervals of time
Correct Answer:
equal areas in equal intervals of time
Explanation:
Kepler's second law states that the Sun-planet line sweeps out equal areas during equal intervals of time.
2. The line joining the Sun to a planet is called the
A.
Sun-planet line
B.
equatorial line
C.
diameter line
D.
tangent line
Correct Answer:
Sun-planet line
Explanation:
The imaginary line joining the Sun and the planet is referred to as the Sun-planet line in Kepler's second law.
3. If a planet sweeps an area A in time t, the area swept by the Sun-planet line in time 2t is
A.
A
B.
2A
C.
A/2
D.
4A
Correct Answer:
2A
Explanation:
Equal areas are swept in equal times, so doubling the time doubles the area swept by the Sun-planet line.
4. In equal time intervals, the areas swept by the Sun-planet line are
A.
equal
B.
always zero
C.
proportional to the distance from the Sun only
D.
different for every interval
Correct Answer:
equal
Explanation:
Kepler's second law directly states that the Sun-planet line sweeps out equal areas in equal time intervals.
5. During a planet's motion around the Sun, the area swept by the Sun-planet line is measured between
A.
the two positions of the planet and the Sun
B.
the two positions of the Sun and Earth's equator
C.
the planet's path and a tangent only
D.
two points on the planet's surface
Correct Answer:
the two positions of the planet and the Sun
Explanation:
The swept area is the area bounded by the two Sun-planet lines drawn to the planet's two positions and the part of the orbit between them.
6. If equal areas are swept by the Sun-planet line in equal times, the area swept per unit time is
A.
constant
B.
zero
C.
continuously increasing
D.
continuously decreasing
Correct Answer:
constant
Explanation:
Equal areas in equal time intervals mean that the area swept per unit time remains constant.
7. Kepler's second law is also known as the law of
A.
areas
B.
periods
C.
orbits
D.
distances
Correct Answer:
areas
Explanation:
Kepler's second law is called the law of areas because it describes the equal areas swept by the Sun-planet line in equal times.
8. Suppose a planet moves from position P1 to P2 in a time interval. The area swept by the Sun-planet line is represented by the region between
A.
SP1, SP2, and the orbital arc P1P2
B.
P1P2 and the planet's diameter
C.
SP1 and the planet's circumference only
D.
SP2 and the Sun's diameter only
Correct Answer:
SP1, SP2, and the orbital arc P1P2
Explanation:
The swept sector is bounded by the Sun-planet lines SP1 and SP2 and the portion of the planetary orbit between P1 and P2.
9. If the Sun-planet line sweeps 5 square units in 1 hour, how much area will it sweep in 3 hours?
A.
5 square units
B.
8 square units
C.
15 square units
D.
20 square units
Correct Answer:
15 square units
Explanation:
The area swept per unit time is constant, so in 3 hours the line sweeps 3 times 5, or 15 square units.
10. The equal-area rule applies to the motion of a planet around the
A.
Sun
B.
Moon only
C.
nearest star only
D.
Earth's equator
Correct Answer:
Sun
Explanation:
Kepler's second law concerns the line joining a planet to the Sun and states that this line sweeps equal areas in equal times.
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