10 Question-Answer on gravitational intensity
1. Gravitational intensity at a place is given by:
(a) G
(b) g
(c) mg
(d) none of the above
Ans: ( b)
2. Units of gravitational intensity are
(a) Ms-2
(b) N kg-1
(c) Kg ms-1
(d) Kg ms-2
Ans: (a,b)
3. intensity of gravitational field on earth is maximum at
(a) Poles
(b) Equator
(c) Centre of earth
(d) Same every where
Ans: (a)
4. If earth were a hollow sphere, what would be gravitational field intensity at any point inside the earth?
(a) 9.8 m/s2
(b) >9.8 m/s2
(c) <9.8 m/s2
(d) Zero
Ans: (d)
5. A mass m is placed at a point B in the gravitational field of mass M. When the mass m is brought from B to near point A, its gravitational potential energy will
(a) Remain unchanged
(b) Increase
(c) Decrease
(d) Become zero
Ans: ( c)
6. If g is the acceleration due to gravity on the earth’s surface, the gain in potential energy of the earth at a height equal to three times the radius R of the earth will be:
(a) mg R
(b) mg R/2
(c) mg R/3
(d) 3 mgR/4
Ans: (d)
7. The gravitational intensity at any point due to earth inside the earth is :
(a) Same at the surface
(b) Increase as we go down
(c) Same as at the centre of earth
(d) Decreases as we go down
Ans: (d)
8. There are two bodies of masses 100,000 kg and 1000 kg separated by a distance of 1m. At what distance from the smaller body, the intensity of gravitational field will be zero:
(a) m/9
(b) m/10
(c) m/11
(d) 10m/11
Ans: (c)
9. In a gravitational field, if a body is bound, then total energy has:
(a) Positive value
(b) Negative value
(c) Zero value
(d) KE < PE
Ans: (b)
10. At what height from the surface of the earth, the total energy of a the satellite is equal to its potential energy at a height of 2R from the surface of earth (R = radius of earth)
(a) R/4
(b) R/2
(c) 2R
(d) 4R
Ans: ( b)
Comments
Post a Comment