$\dfrac{\text{payload mass}}{\text{fuel mass}}$

Rockets - class-XI - Aliensbrain

Question 1 Multiple Choice (Single Answer)

The formula for critical velocity is :

$\sqrt {2R g}$
$\dfrac{R}{g}$
$\dfrac{3R}{2g}$
$\sqrt {R g}$

Question 2 Multiple Choice (Single Answer)

The escape velocity for any satellite to be placed in a orbit is :

$11.2 \ kms^{-1}$
$11 \ kms^{-1}$
$22 \ kms^{-1}$
$22.2 \ kms^{-1}$

Question 3 Multiple Choice (Single Answer)

The correct relation between escape velocity $v _e$ and critical velocity $v _0$ is :

$ v _e=\sqrt{\dfrac{3}{2}} v _0$
$ v _e=\sqrt{2} v _0$
$ v _e=\sqrt{3}v _0$
$ v _e=\sqrt{\dfrac{2}{3}}v _0$

Question 4 Multiple Choice (Single Answer)

Payload ratio is :

$\dfrac{\text{fuel mass}}{\text{payload mass}}$
$\dfrac{\text{payload mass}}{\text{fuel mass}}$
$\dfrac{\text{payload mass}}{\text{total rocket mass}}$
None of the above

Question 5 Multiple Choice (Single Answer)

Which of the following satellites have been successfully built by India ?

Communication Satellites
Meteorological Satellites
Remote Sensing Satellites
All of the above

Question 6 Multiple Choice (Single Answer)

When the fuel in the rocket burns, the rocket moves vertically upward due to :

the exhaust gases escape through the nozzle opposite to the earth and pushes downwards
the exhaust gases escape through the nozzle opposite to the earth and pushes upwards
the exhaust gases escape through the nozzle towards the earth and pushes downwards
the exhaust gases escape through the nozzle towards the earth and pushes upwards

Question 7 Multiple Choice (Single Answer)

Multistage rocket is used because:

a single rocket cannot push satellite to a great height
a single rocket cannot carry huge amount of fuel
the speed of a single rocket is less
none of the above

Question 8 Multiple Choice (Single Answer)

Streamlining of the rocket :

minimizes the friction of air.
maximizes the friction of air.
Either A or B is correct depending on the weight of the rocket.
Both A and B.

Question 9 Multiple Choice (Single Answer)

Which of the following need to be considered when the rocket operates:
(A): As the rocket consumes fuel at every instant, its mass goes on decreasing.
(B): The acceleration due to gravity changes continuously as the rocket ascends.
(C): The atmosphere offers resistance in the lower strata of atmosphere.

A, B and C
Only B and C
Only C
None of the above

Question 10 Multiple Choice (Single Answer)

Fill in the blank.
Larger the mass of the rocket _____ is the acceleration.

lesser
larger
same
may be lesser or may be larger

Question 11 Multiple Choice (Single Answer)

Blow a balloon and let it go. You will find it moving in the direction opposite to the direction in which the air is ejected. This demonstrates :

the principle of rocket propulsion
the principle of combustion
the principle of conservation of energy
None of the above

Question 12 Multiple Choice (Single Answer)

The scientific instrument which is usually placed in the front region of the rocket is called :

PAYBOOK
PLAYOAD
PAYLOAD
PLAYWOOD

Question 13 Multiple Choice (Single Answer)

The principle of rocket propulsion depends on :

Newton's third law of motion
Principle of conservation of momentum
Either A and B
Both A and B

Rockets - class-XI

Questions