NEET Physics Keplers Laws of Planetary Motion MCQs Set A

a) semi-major axis

b) major axis

c) radius of orbit

d) semi-minor axis

Answer: semi-major axis

Question: In planetary motion

a) the total angular momentum remains constant

b) the angular speed remains constant

c) the linear speed remains constant

d) neither the angular momentum nor angular speed remains constant

Answer: the total angular momentum remains constant

Question: Kepler’s second law may be stated as "under the influence of central force, in equal interval of time, position vector sweeps out equal

a) area

b) volume

c) distance

d) dispalacement

Answer: area

Question:  The figure shows a planet in elliptical orbit around the sun S. Where is the kinetic energy of the planet maximum ?

a) P⁴

b) P₃

c) P₂

d) P₁

Answer: P⁴

Question:

a) 40

b) 30

c) 20

d) 10

Answer:  40

Question:

a)

b)

c)

d)

Answer:

Question:  A planet goes round the sun three times as fast as the earth. If r_p and r_e are the radii of orbit of the planet and the earth respectively then

a)

b)

c)

d)

Answer:

Question:  The maximum and minimum distances of a comet from thesun are 8 × 10¹² m and 1.6 × 10¹² m. If its velocity when nearest to the sun is 60 m/s, what will be its velocity in m/s when it is farthest

a) 12

b) 60

c) 112

d) 6

Answer:  12

 More Questions..........................................................

Question:  The period of moon's rotation around the earth is nearly 29 days. If moon's mass were 2 fold its present value and all other things remain unchanged, the period of moon's rotation would be nearly

a)

29 days

b)

c)

d)

Answer:  29 days

Question:  A planet of mass m moves around the sun of mass M in an elliptical orbit. The maximum and minimum distance of the planet from the sun are r₁ and r₂ respectively. The time period of planet is proportional to

a)

b)

c)

d)

Answer:

Question:  Which of the following graphs represents the motion of a planet moving about the sun ?

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:  The time period T of the moon of planet Mars (mass M_m) is related to its orbital radius R (G = Gravitational constant) as

a)

b)

c)

d)

Answer:

Question: If the distance of earth is halved from the sun, then the no. of days in a year will be

a) 129

b) 730

c) 182.5

d) 365

Answer: 129

Question: If the earth is at one-fourth of its present distance from the sun, the duration of the year will be

a) one-eighth the present year

b) one-sixth the present year

c) one-tenth the present year

d) half the present year

Answer: one-eighth the present year