Free gk questions Online Test - MeritNotes

No. of Questions :10

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1. The velocity of photo electron emitted in photoelectric effect depends only on

2. An atom at the ground level is carried to the excited level by photon. It is known as

3. According to Sommerfeld, since the orbit of the electron is elliptical, the velocity of the electron is

(a) minimum when the electron is nearest to the nucleus and maximum when it is farthest from the nucleus
(b) minimum when the electron is nearest to the nucleus or farthest from the nucleus
(c) maximum when the electron is nearest to the nucleus or farthest from the nucleus
(d) maximum when the electron is nearest to the nucleus and minimum when it is farthest from the nucleus

4. Which of the following will deflect in electric field?

5. Cathode rays can be deflected by

6. Metastable state in laser is

7. Cathode rays enter an electric field normal to the lines of force. Then their path in the electric field is

8. The first explosion of an atomic device in India was carried out in the state of

9. The materials which conduct electricity at zero resistance are called

10. After pumping process in laser, ______

(a) no atoms are available in the excited state
(b) the number of atoms in the ground state is equal to the number of atoms in the excited state
(c) the number of atoms in the ground state is greater than the number of atoms in the excited state
(d) the number of atoms in the excited state is greater than the number of atoms in the ground state

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