2nd Year Physics Chapter 1 Test15. Gravitation

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Artificial satellites are used for:
   1. Communication
   2. Military operations
   3. Scientific research
   4. All of the above
2. The first artificial satellite launched in 1957 was:
   1. Apollo 11
   2. Voyager 1
   3. Sputnik 1
   4. Explorer 1
3. If medium between the masses is changed by a conductor then the gravitational force will
   1. increase
   2. decrease
   3. remain constant
   4. become zero
4. Gravitational potential at a point is defined as:
   1. Work done per unit distance
   2. Work done per unit mass
   3. Work done per unit force
   4. Work done per unit velocity
5. Gravitational potential is always taken as zero at:
   1. Earth’s surface
   2. Earth’s center
   3. Infinite distance from Earth
   4. North pole
6. Gravitational field lines always:
   1. Point outward from the Earth
   2. Form closed loops
   3. Point radially inward towards the center of mass
   4. Are parallel to Earth’s surface
7. Gravitational force between two masses decreases if:
   1. Masses increase
   2. Distance increases
   3. Distance decreases
   4. None of these
8. The SI unit of gravitational potential is:
   1. N/kg
   2. J/kg
   3. J/N
   4. N/J
9. A geostationary satellite completes one orbit in:
   1. 12 hours
   2. 24 hours
   3. 48 hours
   4. 1 hour
10. The unit of gravitational field strength ‘g’ is:
    1. N/kg
    2. N/m²
    3. J/kg
    4. kg m/s