CUET · PHYSICS · PYQ PAPER 2025

Which of the following statements is not true?

A Conductance is the reciprocal of resistance.
B Ohm's law is not applicable at very low and very high temperatures for conductors.
C Semiconductors obey Ohm's law.
D Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes.

Verified Solution

Answer & Solution

Correct Answer

(C) Semiconductors obey Ohm's law.

Step-by-step Solution

Detailed explanation

Semiconductors are non-ohmic devices, meaning they do not obey Ohm's law. In semiconductors, the relationship between voltage and current is non-linear, as their resistance changes with applied voltage and temperature.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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C. Stopping potential	(III) \(\left[M L^2 T^{-3} A^{-1}\right]\)
D. de Broglie wavelength	(IV) \(\left[M L^2 T^{-1}\right]\)

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List-I	List-II
(A) Gyromagnetic ratio	(I) \( 4 \times 10^{-5} \text{ T} \)
(B) Permeability of free space	(II) \( 9.27 \times 10^{-24} \text{ Am}^2 \)
(C) Earth's magnetic field at equator	(III) \( 8.8 \times 10^{10} \text{ C/kg} \)
(D) Bohr magneton	(IV) \( 12.56 \times 10^{-7} \text{ TmA}^{-1} \)

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Match List-I with List-II

LIST - I (Statement)	LIST - II (Energy band diagram)
(A) An intrinsic semiconductor at \(T =0 K\)	(I)
(B) An intrinsic semiconductor at \(T >0 K\) with thermally generated electron-hole pairs.	(II)
(C) Energy bands of n-type semiconductor at \(T >0 K\)	(III)
(D) Energy bands of p -type semiconductor at \(T >0 K\)	(IV)

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