We can calculate mass of any planet or star if we know …………
a) acceleration due to gravity (g)
b) radius of earth
c) radius of planets
d) both a & c
The radius of Jupiter is …………
a) 7.15×107m
b) 7.15×109m
c) 7.15 m/s1017m
c) 7.15×1013m
Explanation: Jupiter is the largest planet on solar system, having radius of 7.15×107m.
The value of acceleration due to gravity on moon surface is ……………
a) 9.8m/s2
b) 10 m/s2
c) 1.6 m/s2
d) 9.6 m/s2
Explanation: Moon is a natural satellite having mass of 7.3×1022kg and radius of 1.74×106m.
How many planets we have in our solar system?
a) 7
b) 8
c) 9
d) 6
Newton was unable to explain which type of forces?
a) non contact forces
b) contact forces
c) both a & b
c) none of these
Explanation: Newton was unable to explain how objects can exert forces on one another without coming into contact.
The gravitational pull of the earth acting on the body whether the body is in contact with the earth or not is …………………..
a) gravity
b) weight
c) field force
d) gravitational force
