Subject Specialist SS Physics MCQs Past Papers

1. Lorentz force is the sum of:
a) Gravitational and centripetal force
B) ELECTRIC AND MAGNETIC FORCE
c) Magnetic and nuclear force
d) Electrical and nuclear force

2. The areas under the hysteresis loop is proportional to
a) Magnetic energy density
b) Thermal energy per unit volume
C) ELECTRIC ENERGY PER UNIT VOLUME
d) Mechanical energy per unit volume

3. The frequency of A.C is measured using:
a) Multimeter b) avometer c) TACHOMETER d) speedometer

4. Del. E = rho/epsilon not is called
a) GAUSS’S LAW b) faraday’s law c) ampere’s law d) biot savart’s law

5. For computation of the rate at which the dipole radiates energy, the interaction of the normal component of __________ is done over sphere of radius R.
a) ELECTRIC FIELD b) pointing vector c) addition vector d) radiation

6. Semiconductor materials have _____ bonds.
a) Ionic b) COVALENT c) mutual d) metallic

7. The depletion region of a pn junction is formed:
a) During the manufacturing process
B) WHEN FORWARD BIAS IS APPLIED TO IT
c) Under reverse bias
d) When its temperature is reduced

8. The current amplification factor DC is given by:
A) IC/IE b) Ic/Ib c)Ib/Ie d) Ib/Ic

9. In amplitude modulation
a) Carrier frequency is changed
B) CARRIER AMPLITUDE IS CHANGED
c) Three sidebands are produced
d) Fidelity is improved

10. Demodulation
a) Is performed at the transmitting station
b) Removes side bands
c) Rectifies modulation signal
d) IS OPPOSITE OF MODULATION

11. Which of the following x-ray lines will have the largest frequency in a given element
a) K alpha b) K BETA c) L gamma d) it depends on the element

12. Which of these statements is a consequence of planck’s derivation of a radiation law?
a) Atomic oscillator can emit and absorb energy at discrete values only
b) ATOMIC OSCILLATOR CAN EMIT AND ABSORB ENERGY AT DISCRETE FREQUENCIES ONLY
c) Both A & B
d) None of these

13. The Zeeman effect without the spin of the electron is called_____ Zeeman effect
a) ANOMALOUS b) normal c) paschen d) None of these

14. Zero point energy of harmonic oscillator is
a) hw b) HW/2 c) zero d)hw2

15. According to pauli exclusion principle for two identical ferminions the total __ is antisymmetric
a) Matrix b) WAVE FUNCTION c) operator d) tensor

16. The decay rate of a radioactivity is measured in units of
a) CURIES b) roentgens c) rads d) rems

17. Why are the fission fragments usually radioactive?
a) They come originally from radioactive U235
b) They have a large neutron excess
c) THEY HAVE A LARGE BINDING ENERGY PER NUCLEON
d) They are moving at high speed

18. In a nuclear reactor, the function of the moderator is
a) To absorb neutrons
b) To keep the reactor from going critical
c) TO SLOW DOWN THE NEUTRONS
d) To absorb heat from the core

19. What is the main difficulty associated with the fusion process as a source of electrical power
a) The scarcity of fuel
b) THE COULOMB BARRIER
c) The radioactivity of the products
d) The danger of an explosion

20. Binding energy of a deuteron is
A) 2.22 MEV b) 2.8Mev c) 2.3Mev d)none of these

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