# Model Papers of Class 12th (Physics) Objective for SSC Annual Examination 2018

## Model Paper Physics Paper-12th

SECTION - A

Time Allowed: 20 Minutes
1-The minimum charge on any body can not less than---------- (a) 1.6 x 10 27C (b) 1.6 x10 -19C (c) 1.6 x10 -31C (d) None of These
2-If a charged particle moves through a magnetic field perpendicular to it. The energy of the particle will--------
(a) Increase (b) Increase (c) Remain Constant (d) None of These

3- The force b/w two points charges when placed in a dielectric medium will----------
(a) Increase (b) Increase (c) Remain Constant (d) None of These

4- Which one can be used as a unit of energy?
(a) Volt-ampere (b) Newton Per meter (c) Watt Second (d) Volt Per coulomb

5- A perfect absorber must be a perfect---------

6- Pair production occurs ody the energy of photon is at least equal to----------
(a) 1.02 Mev (b) 1.02 Kev (c) 1.02 Ev (d) 1.02 Jules

7- Weber per second is equal to--------------
(a) Joule (b) Volt (c) Tesla (d) None of These

8- If the K.E of electrons, protons, alpha particles and neutrons is the same. Which one will have the shortest wavelength?
(a) Electron (b) Proton (c) Alpha Particle (d) Neutron
9- If a step up transformer is 100% efficient, the primary and secondary windings will have the same----
(a) Power (b) Current (c) Number of Turns (d) Voltage

10- When the P-N junction is reversed biased. The current flowing through it will have he order of-----------
(a) Milli amperes (b) Amperes (c) Nano amperes (d) Micro-amperes

11- An electrical bulb marked 100W, 200V would mean frat the resistance is ---------
(a) 200 Am (b) 400am (c) 50am (d) 2am

12- The shortest wavelength of radiation in Paschen series is--------
(a) RH/9 (b) 9/RH (c) 9RH (d) 99RH

13- The ion Zation potential of Hydrogen atom is-----------
(a) 13.6Kev (b) 13.6Mev (c) 13.6ev (d) -13.6ev

14- The phase difference between current and voltage at resonance is-----------
(a) 0 (b) π (c) - π (d) π/2

15- What is the coefficient of mutual inductance when he magnetic flux changes by 2 x 10-2 WB and change in current is 0.01 A?
(a) 2H (b) 3H (c) ½ H (d) Zero

16- A circuit having zero resistance is called---------
(a) Short Circuit (b) Closed circuit (c) Open circuit (d) None of these

17 -The reciprocal of decay constant of a radio Active substance is---------
(a) Half Life (b) Total Life (c) Mean Life (d) None of these

18- The radius of 31rd bohr orbit in H-atom is greater than the radius of the 1St orbit by the factor of-------
(a) 9 (b) 3 (c) 2 (d) 4