Flight of a rocket in the space is an example of______________________?

Related Mcqs:

1. Taking off rocket can be explained by __________________?

   A. 1st law of motion
   B. 2nd law of motion
   C. Law of conservation of momentum
   D. law of conservation of energy

2. The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?

   A. -1
   B. 1
   C. 2
   D. -2

3. The thrust on the rocket in the absence of gravitational force of attraction is__________________?

   A. Constant
   B. not constant
   C. constant if the rate of ejected gases is constant
   D. constant for short range rocket.

4. Propulsion force of a rocket is____________________?

   A. non-conservative force
   B. conservative force
   C. both A and B
   D. none of these

5. Which shows the correct relation between time of flight T and maximum height H ?

   A. H=gT2/8
   B. H=8T2/g
   C. H=8g/T2
   D. H=gT2

6. Value of permeability of free space in SI units is___________________?

   A. 4πx10-9 WbA-1m-1
   B. 4πx10-7 WbA-1m-1
   C. 4πx10-10 WbA-1m-1
   D. 4πx10-8 WbA-1m-1

7. Electromagnetic waves travel in free space with the speed of___________________?

   A. λ-rays
   B. Positive rays
   C. Cathode rays
   D. More than sound waves

8. The direction of a vector in space is specified by_______________?

   A. One angle
   B. Two angle
   C. Three angle
   D. No angle

9. A vector can have maximum________components in space.?

   A. Zero
   B. Two
   C. Three
   D. Infinite

   Submitted by: Zahid Jagirani

10. Instantaneous and average velocities become equal when body___________________?

    A. has zero acceleration
    B. has uniform acceleration
    C. has variable acceleration
    D. moves in a circle