The antiparticle of electron is: ______?

Related Mcqs:

1. 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

2. For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?

   A. 107m/sec
   B. Should be greater than the speed of light.
   C. Be zero
   D. Not be wave-like

3. In bringing an electron towards the second electron, the electrostatic potential energy of the system

   A. Decreases
   B. increases
   C. remains the same
   D. becomes zero

   Submitted by: Tauseef Ali

4. The charge on an electron was determine by ________________?

   A. Ampere
   B. Maxwell
   C. Millikan
   D. Thomson

5. A particle having the mass of an electron and the charge of a proton is called a______________?

   A. Antiproton
   B. Positron
   C. Gamma rays
   D. Photon

6. In an electron microscope, we use energetic particles because of______________?

   A. Penetrating power is high
   B. Kinetic energy is large
   C. Wavelength is very short
   D. All the above reasons

7. In the electron microscope, electric & magnetic fields are used as_______________?

   A. Electromagnetic gun
   B. Source of electromagnetic waves
   C. Deflecting charged particle
   D. Converging source of electrons

8. Electron moves in the orbit as________________?

   A. Simple vibratory motion
   B. Standing wave motion
   C. Vibratory motion like up and down
   D. S.H.M likes the sound

9. Wave-like characteristic of electron is demonstrated by______________?

   A. Line spectrum of atoms
   B. Production of x-rays.
   C. Diffraction by crystalline solids
   D. Photoelectric effect

10. Electron cannot exist in the nucleus it is confirmed by observing that______________?

    A. It does emit radiation
    B. Its size as compare to proton and neutron is very small
    C. No antiparticle of electron is present
    D. The velocity of electron must be very high according to uncertainty principle