Second Year Physics Chapter 19 Online MCQ Test for 2nd Year Physics Chapter 19 Dawn of Modern Physics Preparation

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.#	Question	Answer
1	If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be	A. 50 V B. 2 V C. 5 V D. 15 V
2	Pair production cannto take place in vacuum because :	A. Mass in not conserved B. Momentum is not conserved C. Energy is not conserved D. Charge is not conserved
3	The minimum energy required for occurrence of pair production is:	A. 1.022eV B. 1.02keV C. 1.02Me.V D. 1.04MeV
4	A positron is an anti particle of.	A. Proton B. Electron C. Neutron D. Photon
5		A. Wien's constant B. Planck's constant C. Davison constant D. Lumber's constant
6	If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.	A. √2 B. 1/√2 C. 2 D. 1/2
7	Platinum wire becomes white at a temperature of.	A. 1600oC B. 1300oC C. 1100oC D. 900oC
8	The wavelength associated with the protons moving at speed of 40 m/s is.	A. 7.20 nm B. 9.02 C. 15.7 nm D. 17.3 nm
9	When platinum is it becomes orange at.	A. 500oC B. 900oC C. 1100oC D. 1300oC
10	The value of Stefan is constant is:	A. 4.57 x 10-8 m2k2 B. 5.67 x10-8 wm-2k-4 C. 6.67x 10-11 wm2k4 D. 7.45 x  10-9 m2 wk3