modern physics Interview Questions and Answers
Ques:- Cathode rays can be deflected by
A. Magnetic field
B. Electric fields
C. Both electric and magnetic fields
D. None of the above
Ques:- The velocity of photo electron emitted in photoelectric effect depends only on
A. The wave length of incident light
B. The frequency and intensity of incident light
C. The frequency of incident light
D. None of these
Ques:- Cathode rays enter an electric field normal to the lines of force. Then their path in the electric field is
A. Parabola
B. Straight line
C. Circle
D. Ellipse
Ques:- An atom bomb is based upon the principle of
A. Controlled nuclear fission
B. Nuclear fusion
C. Nuclear fission
D. None of the above
Ques:- The mass defect per nucleon is called
A. Binding energy
B. Packing fraction
C. Ionization energy
D. Excitation energy
Ques:- Nuclear forces are
A. Attractive or repulsive depending upon separation between nucleons
B. Neither attractive nor repulsive
C. Attractive only
D. Repulsive only
Ques:- If a U-238 nucleus splits into two identical parts, the two nuclei so produced will be
A. Radioactive
B. Stable
C. Isobars
D. Isotopes
Ques:- Which of the particles has similar mass to that of the electron?
A. Neutrino
B. Positron
C. Neutron
D. Proton
Ques:- The ratio of specific charges of an alpha particle to that of a proton is
A. 1/2
B. 1/3
C. 1/1
D. 2/1
Ques:- The cause of fractional atomic weights of elements is the presence of
A. Isotones
B. Isobars
C. Isotopes
D. None of these
Ques:- Voltage applied between the electrodes of discharge tube is of the nature
A. Voltage obtained by induction coil
B. 220 V alternating voltage
C. 220 V DC voltage
D. Variable voltage
Ques:- The mass energy relation is the outcome of
A. Special theory of relativity
B. Quantum theory
C. Field theory of relativity
D. General theory of relativity
Ques:- The first explosion of an atomic device in India was carried out in the state of
A. Rajasthan
B. Jammu and Kashmir
C. Manipur
D. Nagaland
Ques:- Which of the following will deflect in electric field?
A. X-rays
B. Y-rays
C. Ultraviolet rays
D. Cathode rays
Ques:- In nuclear fission, the percentage of mass converted into energy is about
A. 10%
B. 0.01%
C. 0.1%
D. 1%
Ques:- If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
A. Gamma rays
B. Alpha rays
C. Beta rays
D. None, all have same wavelength
Ques:- When the speed of electrons increases, then the value of the specific charge on an electron
A. Increases
B. Decreases
C. Remains unchanged
D. None of these