Punjab 12th Class Physics Chapter 9 Atomic Spectra Mcqs Test Online Punjab 12th Class Physics Chapter 9 Atomic Spectra Mcqs Test Online 12345678910 Question 1 of 10Physics 1. In the Bohr’s model of the hydrogen atom, the lowest orbit corresponds to: 1.Infinite energy 2.Zero energy 3.Maximum energy 4.Minimum energy Question 1 of 10Question 2 of 10 2. Laser is device which can produce: 1.Monochromatic beam of light 2.Coherent beam of light 3.All of the above4.Intense beam of light Question 2 of 10Question 3 of 10 3. In accordance with Bohr’s theory the K.E, of the electron is equal to: 1.ke²/r² 2.ke²/2r 3.ke²/r 4.ke²/2r²Question 3 of 10Question 4 of 10 4. According to Bohr’s theory the radius of quantized orbit is given by: 1.4π²mZe²k/n²h² 2.n²h²/4π² m ke² 3.4π²m/n²h²ke² 4.n²h²ke²/4π²mQuestion 4 of 10Question 5 of 10 5. When an electron in an atom goes from a lower to higher orbit its: 1.K.E increases, P.E decreases 2.K.E decreases, P.E decreases 3.K.E increases, P.E increases 4.K.E decreases, P.E increases Question 5 of 10Question 6 of 10 6. Frequency of X-rays depends upon: 1.Nature of the target 2.Accelerating potential 3.Number of electrons striking target 4.Both b and c Question 6 of 10Question 7 of 10 7. Target material used in X-rays tube must have following properties: 1.Low atomic number and low melting point 2.High atomic number only 3.High atomic number and low melting point 4.High atomic number and high melting point Question 7 of 10Question 8 of 10 8. For an atom of hydrogen atom the radius of the first orbit is given by: 1.me/4h² 2.h/me² 3.h²/4π²kme² 4.h² me²Question 8 of 10Question 9 of 10 9. If 13.6eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n = 2 is: 1.10.2eV 2.6.8 eV 3.0 eV 4.3.4 eV Question 9 of 10Question 10 of 10 10. The Balmer series is obtained when all the transition of electron terminate on: 1.2nd orbit 2.3rd orbit 3.1st orbit 4.4th orbit Question 10 of 10 Loading... Test By Subject Punjab Test By Topics 12th Class Physics You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.