Chapter-24
Space Science
B. Rockets and Satellites
Learning Card-1
Choose the correct answer:
1. The escape velocity of an object with respect to earth is
a) 11.2 km/s b. 11.2 m/s c.12.1 m/s d. 9.8m/s
2. Payland is a
a) Fuel b) oxidiser c) Scientific instruement d) Engine
3. Aryabhata is a/an
a) Rocket b) Artificial satellite c) National satelliete d) Space craft.
4. The radius of the orbit of geostationary satellite is
a. 3600 km b. 36000m c. 36000 km d. 11.2 km
Question and Answers:
1. What is a propallant?
The mixture of oxidiser and fuel is called propallent
2. Write any two Rocket Propallants
a) Liquid hydrogen and liquid oxygen.
b) Kerosene and liquid oxygen
c) Hydrazine and Nitric acide
3. State Newton’s third law of motion.
Newton’s third law of motion- “ For every action there will be be equal and opposite reaction, where action and reacton are occuring on the different objects”.
4. State the law of “conservation of momentum”
Law of ‘conservation of Momentum”-The total momentum of the system is conserved when the net force acting on the system is zero”.
5. Write an expression for recoil velocity.
Expression for recoil velocity V=(-mv)/M
6. Define “orbital velocity”.
The velocity of the satellite along a circular path is called the orbital velocity (vo)
7. Define “escape velocity”.
The minimum velocity with which a body must be projected so that it escapes from the gravitational field of earth is called escape velocity.(ve)
8. Write the relation b/w escape velocity and orbital velocity.
Where
VO-Orbital Velocity
Ve-Escape velocity.
9. Waht are multistaged rockets?
The rocket in which several rockets are joined together one on top of the other to increase efficiency is called multistaged rocket
10. Expand -(i)PSLV (ii) GSLV (iii) ISRO.
PSLV: Polar satellite launch vehicle.
GSLV: Geosynchrouecs satellite launch vehicle
ISRO: Indian space research Organisation.
11. Draw neat diagram of single staged rocket and lable the parts
Diagram of single stage rocket.
Chapter-24
Space Science
B. Rockets and Satellites
Learning Card-2
Choose the correct answer:
1. Which among the following is not a fuel?
(a) Liquid hydrogen (b) Aluminium percolate (c) Hydrazine (d) Synthetic rubber
2. The equation of the Thurst on the rocket is given by
(a) RVex = M.a (b) R.M = Vex · a (c) R.M = Vex (d) R.a = M · Vex
3. The satellite which is placed at the height of 36,000Km is
(a) Remote sensing (b) Meterological (c) Geo stationary (d) Rohini
4. The first artificial satellite launched by the Indians is
(a) Rohini (b) IRS (c) Bhaskar (d) Aryabhata
Question and Answers:
1. What is pay load?
The scientific instrument which is placed in the front region of the rocket is called payload
2. Give the relation between thrust, rate of combustion of fuel and exhaust velocity.
Thurst = R.Vex
3. Write the relation between escape velocity and acceleration due to gravity.
4. What are geostationary satellites?
The satellites whose period of revolution is same as the period of rotation of the earth are called geostationary satellites
5. What is the need of adding oxidiser to fuel in the rockets?
Because as we move away from the earth surface the availability of oxygen required for the combustion of the fuel decreases and almost nill when it crosses atmosphere. Therefore to supply the required oxygen the oxidisers are used.
6. Define "pay load ratio" in rocket designing.
The ration of the pay load mass (m) to the fuel mass (M) is called pay load ratio.
7. How a multistage rocket is advantageous over a single stage rocket?
Advantages of multistaged rockets.
* Efficiency is more
* Fuel consumption can be minimised
* Heavy payloads could be taken to the greater height.
8. Classify the following into Rockets and satellites. Aryabhata, GSLV,
Rohini, APPLE, IRS-1A, RSLV.
Rockets - GSLV, PSLV
Satellite - Rohini, APPLE, IRS-1A, Aryabhata
9. Match the numerical values with the relative constants
G - 6.672 × 10–11 Nm2kg–2
g - 9.8m/s
RE - 6.37 × 106m
Ve - 11.2km/s
10. In the automobiles which travel on the ground only fuel is filled not oxidiser. Why?
Because the oxygen required for the combustion process of the fuel is available in the atmosphere.
11. What happens to the mass, acceleration due to gravity and atmospheric resistance as the rocket-ascends?
Mass of the rocket
Acceleration due to gravity } decreases as the rocket ascends
Atmospheric resistance
Chapter-24
Space Science
B. Rockets and Satellites
Learning Card-3
Choose the correct answer:
1. With respect to the momentum of a system which among the following equations is wrong.
a) V/v = -m/M b) M/V = -m/v c) –m/V = M/v d) V = (-mv)/M
2. As the height of the satellite from the earth surface increases, the orbital velocity of the satellite
a) Decreases b) Increases c) Remains same d) Varies with time.
Question and Answers:
1. What are missiles?
Rockets which carry explosives as pay load are called missiles.
2. If the radius of the earth is 6.37 x 106m and the escape velocity is 11.2 km/s, calculate acceleration due to gravity.
3. A vehicle theif was caught by the police using GPS technology which kind of satellite helps in catching thief.
Geo stationary satellite
4. Rocket launching pads are located at the seashore or costal region, why?
Because as the rocket is launched, the burnt part of the rockets are made to fall into the sea or oceans.
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