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Space Mechanics

Total questions: 43

Worksheet time: 44mins

Name
Class
Date
1.
Spaceflight dynamics is also known as
a)
Astrology
b)
Aerodynamics
c)
Astrodynamics
d)
Propulsion
2.
According to geocentric theroy,
a)
earth is the center of universe
b)
sun is the center of universe
c)
sun is the center of solar system
d)
none of the above
3.

According to Newton's law of gravitaiton,

a)

each planet's orbit about the Sun is an ellipse

b)

a planet moves in its ellipse so that the line between it and the Sun placed at a focus sweeps out equal areas in equal times.

c)

force of attraction between two bodies is directly proportional to the product of the masses of the two particles

d)

the ratio of the square of an object's orbital period with the cube of the semi-major axis of its orbit is the same for all objects

4.
According to Newton's law of gravitaiton, every attracts other particle with a gravitational force whose magnitude is
a)
inversely proportional to the square of the distance between them
b)
each planet's orbit about the Sun is an ellipse
c)
a planet moves in its ellipse so that the line between it and the Sun placed at a focus sweeps out equal areas in equal times.
d)
the ratio of the square of an object's orbital period with the cube of the semi-major axis of its orbit is the same for all objects
5.

Mass of Sun and earth are 2 x 10^30 kg and 6 × 10^24 kg respectively. The distance beween their centers is 1.5 x 10^11 meters. The value of gravitational constant, G = 6.67 × 10^−11 m3∕kgs2. What is gravitational attraction force between sun and earth?

a)

5 x 10^10 N

b)

20 x 10^9 N

c)

50 x 10^5N

d)

3.557×10^22 N

6.
The apogee and perigee distances of a satellite orbiting in an elliptical orbit are respectively 45000 km and 7000 km. What is the value of eccentricity?
a)
1.73
b)
0.3
c)
0.73
d)
2.5
7.
The apogee and perigee distances of a satellite orbiting in an elliptical orbit are respectively 45000 km and 7000 km. What is the value of semi-major axis of the elliptical orbit?
a)
7000 km
b)
45000 km
c)
1000 km
d)
26000 km
8.

Kepler's second law states that

a)

force of attraction between two bodies is directly proportional to the product of the masses of the two particles

b)

inversely proportional to the square of the distance between them

c)

force is equal to mass x acceleration

d)

The line joining the satellite and the centre of the Earth sweeps out equal areas in the plane of the orbit in equal time intervals

9.
Kepler's third law is also known as
a)
Newtons's second law
b)
Second law of thermodynamics
c)
Newton's law of gravitation
d)
law of periods
10.
In an elliptical orbit, at apogee
a)
the velocity is minimum
b)
the velocity is maximum
c)
the velocity is zero
d)
none of the above
11.

In an elliptic orbit, the perigee is

a)

the shortest distance beween earth and satellite

b)

focus point

c)

the furthest distance beween earth and satellite

d)

none of the above

12.

The semi-major axis of an elliptic orbit is

a)

focus point

b)

the shortest distance beween earth and satellite

c)

average of apogee and perigee

d)

none of the above

13.
Which of the following planets has a revolution time which is shorter than its rotation time?
a)
venus
b)
earth
c)
mars
d)
jupiter
14.

The greater the distance between the bodies in space, the force of gravity between them __________

a)

no change

b)

increases

c)

decreses

d)

none of the above

15.
The satellite orbit cuts the equatorial plane at _____________ when it from the northern hemisphere to the southern hemisphere
a)
descending node
b)
zenith
c)
vernal equinox
d)
ascending node
16.
Apogee can be expressed as
a)
the difference between apogee and perigee
b)
the average of apogee and perigee
c)
a(1+e)
d)
none of the above
17.

The value of eccentricity can be calculted as

a)

the average of apogee and perigee

b)

the difference between apogee and perigee

c)

(apogee-preigee)/(apogee+perigee)

d)

none of the above

18.
The angle, Ω measured from the vernal equinox towards the line of nodes in the direction of rotation of Earth is called as
a)
zenith
b)
vernal equinox
c)
apogee
d)
Right ascension of the ascending node
19.

What is this coordinate system

a)

Geographic

b)

Transfer

c)

Interplanetry

d)

energy

20.
_______ orbits are used to raise a spacecraft orbit after launch.
a)
Transfer
b)
vernal equinox
c)
apogee
d)
Inclination
21.
______________ trajectories used to transfer satelite between two planets?
a)
energy
b)
Interplanetry
c)
apogee
d)
Inclination
22.
Orbits are changed by changing the ________ of the orbit.
a)
zenith
b)
velocity
c)
vernal equinox
d)
apogee
23.
This minimum energy trajectory is referred to as a ___
a)
Hohmann transfer
b)
Halo
c)
Equinoxes
d)
Solstices
24.
Spacecraft orbits may be redirected using _________ maneuvers where a close fly by of a planet is be used to change the direction of and orbit and add energy to it.
a)
Aerobraking Orbit
b)
Halo
c)
gravity assist
d)
vernal equinox
25.
The Global Positioning System (GPS) was developed by _______
a)
NASA
b)
ESA
c)
IISC
d)
ISRO
26.
An Earth station can be located at
a)
terresterial
b)
maritime
c)
airborne
d)
all the above
27.
Broadcast Satellite Service (BSS) Earth Stations are also called as
a)
Direct-to-Home
b)
Mobile satellite service
c)
Remote sensing
d)
Navigation
28.
____ orbit is used to serve as a communication between the lunar far side and Earth.
a)
Aerobraking Orbit
b)
Halo
c)
vernal equinox
d)
gravity assist
29.
In elliptic orbit earth is in one focus and other focus is on
a)
moon
b)
sun
c)
space
d)
mars
30.
Kepler's first law is based on
a)
Equinoxes
b)
law of conservation of energy
c)
Solstices
d)
dense air
31.
Kepler's second law is based on
a)
Equinoxes
b)
Solstices
c)
Law of conservation of momentum
d)
dense air
32.
_________ occur when the day and night are equally as long
a)
centripetal
b)
centrifugal force
c)
Magnetic field
d)
Equinoxes
33.
___________ are the longest and shortest days of the year
a)
centripetal
b)
Solstices
c)
centrifugal force
d)
Magnetic field
34.
___________ will receive and transmit signals to satellite
a)
Large Earth station
b)
Medium Earth station
c)
Small Earth station
d)
all the above
35.
In the following which is not present in space
a)
Magnetic field
b)
dense air
c)
radiation
d)
debris
36.
The ____________ force that acts outwards from the centre of the Earth
a)
centrifugal
b)
centripetal
c)
Magnetic field
d)
radiation
37.

In the absence of this centripetal force, the satellite would have continued to move in a ________ at a constant speed after injection

a)

circular orbit

b)

elliptic orbit

c)

straight line

d)

none of the above

38.
The law states about equality of centripetal and centrifugal force is
a)
Newtons's first law
b)
Newtons's second law
c)
Newtons third law
d)
none of the above
39.
On this basis of the angle of inclination of the satellite, i=0 degrees, the orbits can be classified as
a)
inclined orbits
b)
polar orbits
c)
equatorial orbits
d)
none of the above
40.
On this basis of the angle of inclination of the satellite between 0 degrees and 90 degrees, the orbits can be classified as _____
a)
Direct or prograde orbit
b)
Retrograde orbit
c)
circular orbit
d)
elliptic orbit
41.
If formed in the gravity field of a planet as the planet is forming, a moon will orbit the planet in the __________ as the planet is rotating and is a regular moon
a)
same direction
b)
opposite direction
c)
cannot be determined
d)
none of the above
42.
Pluto has ______ rotation
a)
retrograde
b)
Direct
c)
prograde orbit
d)
none of the above
43.
The orbit eccentricity lies ______
a)
between 0 and 1
b)
less than zero
c)
greater than 1
d)
none of the above

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