Ratio of the weight of H-atom to that of an electron is approximately______________?

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. A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference ?

   A. man does more work than child
   B. child does more work than man
   C. both do the same amount of work
   D. it is a foolish question

5. A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?

   A. 0.01J
   B. 0.02J
   C. 0.04J
   D. 1.0J

6. A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is_______________?

   A. mg
   B. mg – ma
   C. mg + ma
   D. mg – ma

7. The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?

   A. Ke2/rn
   B. Ke2/rn2
   C. ÀKe2/rn
   D. ÀKe2/rn2

8. Bracket series is obtained when all transition of electron terminate on_______________?

   A. 4th orbit
   B. 5th orbit
   C. 3rd orbit
   D. 2nd orbit

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