List of top NanoScience Questions on Physics asked in CUET (PG)

Arrange the following in decreasing order of packing fraction :
A. Face centered cubic structure
B. Body centered cubic structure
C. Simple cubic
D. Diamond cubic structure
Choose the correct answer from the options given below :

In which of the following situations, heavier particle has smaller De-Broglie wavelength. If two particles :
A. move with same speed
B. move with same linear momentum
C. move with same kinetic energy
D. have fallen through the same height
Choose the most appropriate answer from the options given below :

Which of the following statements are true about effective mass?
A. Effective mass arises due to interaction of electrons with periodic potential of lattice
B. The curvature of the band determines the electron effective mass
C. Effective mass cannot be negative
D. The calculation of effective mass takes into account the shape of energy bands in 3-D k-space
E. Effective mass of an electron is given by $m^* = \frac{\hbar}{\left(\frac{d^2E}{dk^2}\right)}$
Choose the correct answer from the options given below :

The average energy of an electron is related to Fermi energy (at absolute zero) as :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : FCC lattice has higher packing fraction than simple cubic lattice.
Reason (R) : FCC contains less atoms per unit cell than simple cubic.
In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Gallium Arsenide (GaAs) is a direct-band gap semiconductor and GaP is an indirect - band gap semiconductor.
Reason (R) : In GaAs, top of valence band and bottom of conduction band are both at the same center point in Brillioun Zone, while in GaP top of the valence band is at a different position from the bottom of conduction band in Brillioun Zone.
In the light of the above statements, choose the most appropriate answer from the options given below :

Arrange the following type of electromagnetic waves according to increasing order of their wavelengths :
A. Gamma rays
B. Infrared rays
C. Visible rays
D. Ultraviolet rays
E. Radio waves
Choose the correct answer from the options given below :

A Carnot engine operates between the temperatures 850 K and 300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. The efficiency of this engine is :

Which of the following correctly represents the density of states D(E) for quantum well :
(Here, $K_o, K_1, K_2, K_3$ are constants; $d_i$ are degeneracies; $E_{iw}$ energy of level "$i$" in potential well)

When a semiconductor is doped with pentavalent impurities, the Fermi level (at moderate temperatures) lies :

Under what condition, the diffraction from the lattice will not occur :

Hooke's Law is valid only in :

In quantum well, electrons are confined in :

Temperature dependence of electron-hole mobility due to lattice scattering varies approximately as :

From the Hall Effect experiment, one can measure:

Bragg's law of diffraction is used to determine the:

A system in thermodynamic equilibrium satisfies the following requirements:

A rigid body is dropped from the top of a tower. Midway it splits into two unequal parts. The Centre of mass of the system:

The failure of Michelson-Morley experiment indicated:

A bipolar junction transistor is said to be in active mode if:

Scanning tunneling microscope works on the principle of: