List of top Questions asked in CUET (PG)- 2026

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 $m^* = \frac{\hbar}{\left(\frac{d^2E}{dk^2}\right)}$
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Choose the correct order of steps involved in Chemical Vapour Deposition (CVD) technique :
A. Heterogenous surface reaction catalysed by the surface
B. Nucleation and growth of film
C. Transport of reacting gases and their adsorption to the surface
D. Surface diffusion of the species to growth sites
E. Desorption and transportation of gaseous reaction products away from the surface
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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
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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 :

In Quantum dots, the energy levels resembles to those of :

Arrange the following systems in decreasing order of number of lattices in it.
A. Triclinic
B. Orthorhombic
C. Tetragonal
D. Cubic
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The average energy of an electron is related to Fermi energy (at absolute zero) as :

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 :

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

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 :

In quantum well, electrons are confined in :

During ion-implantation, the impurity atoms entering the crystal, gives up their energy to the lattice via collisions. These impurity atoms come to rest at certain average penetration depth known as :

Hooke's Law is valid only in :

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

Which of the following conditions should be met while writing the canonical structures of a resonance hybrid ?
A. The magnitude of resonance energy should be low and the hybrid will be more stable
B. The number of unpaired electrons should be same in all the canonical forms
C. Canonical forms where similar charges develop on vicinal atoms are highly significant forms
D. The positions of the nuclei of each canonical form and the hybrid must remain same
E. Only a pair of electrons should be shifted in writing the canonical forms
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The known per-oxoacids of Sulphur are :
A. $H_2SO_5$
B. $H_2S_2O_9$
C. $H_3S_4O_{12}$
D. $H_2S_2O_8$
E. $H_2S_2O_7$
Choose the correct answer from the options given below :

Which of the following molecules possess V-shape ?
A. $O_3$
B. $N_3^-$
C. $CO_3^{2-}$
D. $NO_2^-$
E. $NO_3^-$
Choose the most appropriate answer from the options given below :

Which of the silanes are formed by the reactions of $Mg_2Si + H_2SO_4 \longrightarrow$
A. $Si_4H_{10}$
B. $Si_3H_8$
C. $Si_5H_{10}$
D. $Si_6H_{14}$
E. $Si_7H_9$
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A process is spontaneous if :
A. $(\Delta G_{\text{system}})_{T, P} = 0$
B. $\Delta S_{\text{system}} + \Delta S_{\text{surrounding}} > 0$
C. $\Delta S_{\text{system}} + \Delta S_{\text{surrounding}} < 0$
D. $(\Delta G_{\text{system}})_{T, P} < 0$
E. $(\Delta G_{\text{system}})_{T, P} > 0$
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According to Born-Haber cycle, the acid strength of Halogen depends upon :
A. Enthalpy of dehydration
B. Enthalpy of dissociation
C. Dipole moment
D. Electron affinity $X^-$
E. Metal ion
Choose the most appropriate answer from the options given below :

Which of the following compounds have chiral carbon ?
A. 1, 1-Dibromopentane
B. 2-Chloro-2-methylpropane
C. 2-Bromopentane
D. 3-Bromopentane
E. 1-fluoro-2-ethylpentane
Choose the correct answer from the options given below :

Choose the correct sequence by arranging the given ions in the order of increasing size :
A. $Cl^-$
B. $Mg^{2+}$
C. $Br^-$
D. $S^{2-}$
E. $Na^+$
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Choose the correct sequence of the elements arranged in their increasing order of atomic numbers:
A. Pu
B. Po
C. Pm
D. Pt
E. Pa
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