Pair production cannot take place in a vacuum as ________________?

Related Mcqs:

1. Pair production cannot take place in a vacuum as ________ is not conserved ?

   A. Energy
   B. Charge
   C. Mass
   D. MomentumB.

2. Velocity of sound in vacuum is ____________________?

   A. 332 ms-1
   B. 320 ms-1
   C. Zero
   D. 224 ms-1

3. Sound waves do not travel in vacuum because ___________________?

   A. they are transverse waves
   B. they are stationary waves
   C. they require material medium for propagation
   D. they do not have enough energy

4. When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?

   A. a straight line parallel to the field
   B. a parabola in a plane perpendicular to the field
   C. a circle in a plane perpendicular to the field
   D. a straight line along its initial direction

5. After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?

   A. Increases because wavelength decreases
   B. Decreases because speed decreases
   C. Remains same
   D. Increases then decrease

6. Which of the following waves have smallest velocity in vacuum?

   A. Ultraviolet
   B. Sound
   C. Infra-Red
   D. Micro

   Submitted by: Malik Asghar Hussain

7. Pair production takes place in the vicinity of a heavy nucleus so that_____________?

   A. Net energy is conserved
   B. Net charge is conserved
   C. Net momentum is conserved
   D. All of the above

8. Pair production can take place only with_________________?

   A. X-rays
   B. Gamma rays
   C. UV-rays
   D. IR-rays

9. Which one of the following cannot be polarized ?

   A. radio waves
   B. ultraviolot rays
   C. X-rays
   D. sound waves

10. For ___________ flow the path of the fluid particles cannot be tracked?

    A. Laminar
    B. Streamline
    C. Turbulent
    D. Both A and B