Escape velocity and orbital energy MCQs – Aerospace

1. The escape velocity from Earth’s surface is approximately:
(A) 11.2 km/s
(B) 7.9 km/s
(C) 9.8 km/s
(D) 5.0 km/s

2. Escape velocity is defined as the:
(A) Minimum velocity an object needs to escape the gravitational influence of a celestial body
(B) Maximum speed at which an object can remain in orbit
(C) Velocity required to achieve a stable orbit around a celestial body
(D) Speed needed to enter a celestial body’s atmosphere

3. The escape velocity from a planet depends on:
(A) The planet’s mass and radius
(B) The planet’s distance from the Sun
(C) The planet’s atmospheric composition
(D) The planet’s rotation speed

4. For a given celestial body, the escape velocity increases with:
(A) Increasing mass
(B) Increasing temperature
(C) Increasing altitude
(D) Increasing atmospheric pressure

5. The escape velocity from the Moon is approximately:
(A) 2.4 km/s
(B) 11.2 km/s
(C) 7.9 km/s
(D) 5.0 km/s

6. Orbital energy is the sum of:
(A) Kinetic energy and gravitational potential energy
(B) Kinetic energy and thermal energy
(C) Gravitational potential energy and atmospheric pressure
(D) Kinetic energy and electrical energy

7. In a stable orbit, the total orbital energy of a satellite is:
(A) Negative
(B) Zero
(C) Positive
(D) Constant

8. The orbital velocity of a satellite in a circular orbit is:
(A) The speed required to maintain a stable orbit around the celestial body
(B) The speed needed to escape the gravitational influence
(C) The velocity needed to achieve re-entry
(D) The speed required to reach the surface

9. The gravitational potential energy of an object in orbit is:
(A) Negative
(B) Positive
(C) Zero
(D) Constant

10. To escape Earth’s gravitational pull, an object must reach:
(A) Escape velocity
(B) Orbital velocity
(C) Re-entry speed
(D) Maximum velocity