abrowaqas
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Homework Statement
the capital letter option was the answer that i have chosen in my test.
Homework Equations
The Attempt at a Solution
1. 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
2. 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
3. Semiconductor materials have _____ bonds.
a) Ionic b) COVALENT c) mutual d) metallic
4. 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
5. Demodulation
a) Is performed at the transmitting station
b) Removes side bands
c) Rectifies modulation signal
d) IS OPPOSITE OF MODULATION
6. 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
7. 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
8. The decay rate of a radioactivity is measured in units of
a) CURIES b) roentgens c) rads d) rems
9. 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
10. 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
11. 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