Subject Specialist SS Physics MCQs Past Papers notes in pdf download. SS Physics solved mcqs from past papers.
Lorentz force is the sum of the forces:
a) Gravitational and centripetal force
b) Electric and magnetic force
c) Magnetic and nuclear force
d) Electrical and nuclear force
Answer: b) Electric and magnetic force
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
Answer: c) Electric energy per unit volume
The frequency of A.C is measured using:
a) Multimeter
b) Avometer
c) Tachometer
d) Speedometer
Answer: c) Tachometer
Del. E = rho/epsilon not is called:
a) Gauss’s Law
b) Faraday’s Law
c) Ampere’s Law
d) Biot-Savart’s Law
Answer: a) Gauss’s Law
For computation of the rate at which the dipole radiates energy, the interaction of the normal component of __________ is done over a sphere of radius R.
a) Electric field
b) Pointing vector
c) Addition vector
d) Radiation
Answer: b) Pointing vector
Semiconductor materials have _____ bonds.
a) Ionic
b) Covalent
c) Mutual
d) Metallic
Answer: b) Covalent
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
Answer: b) When forward bias is applied to it
The current amplification factor DC is given by:
a) IC/IE
b) Ic/Ib
c) Ib/Ie
d) Ib/Ic
Answer: b) Ic/Ib
In amplitude modulation:
a) Carrier frequency is changed
b) Carrier amplitude is changed
c) Three sidebands are produced
d) Fidelity is improved
Answer: b) Carrier amplitude is changed
Demodulation:
a) Is performed at the transmitting station
b) Removes sidebands
c) Rectifies modulation signal
d) Is opposite of modulation
Answer: d) Is opposite of modulation
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
Answer: b) K beta
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
Answer: b) Atomic oscillator can emit and absorb energy at discrete frequencies only
The Zeeman effect without the spin of the electron is called _____ Zeeman effect:
a) Anomalous
b) Normal
c) Paschen
d) None of these
Answer: b) Normal
Zero point energy of a harmonic oscillator is:
a) hw
b) hw/2
c) Zero
d) hw^2
Answer: c) Zero
According to Pauli Exclusion principle, for two identical fermions, the total __ is antisymmetric:
a) Matrix
b) Wave function
c) Operator
d) Tensor
Answer: b) Wave function
The decay rate of radioactivity is measured in units of:
a) Curies
b) Roentgens
c) Rads
d) Rems
Answer: a) Curies
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
Answer: b) They have a large neutron excess
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
Answer: c) To slow down the neutrons
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
Answer: b) The Coulomb barrier
Binding energy of a deuteron is:
a) 2.22 MeV
b) 2.8 MeV
c) 2.3 MeV
d) None of these
Answer: a) 2.22 MeV