CUET · BIOLOGY · PYQ PAPER 2023

Arrange the following steps of DNA fingerprinting in a correct sequence.
(A) Hybridisation using labelled VNTR probe and autoradiography
(B) Digestion of DNA by restriction endonuclease and separation of fragments by electrophoresis.
(C) Blotting of separated DNA fragments to synthetic membrane.
(D) Isolation of DNA
Choose the correct answer from the options given below:

A D-B-C-A
B C-A-B-D
C D-C-B-A
D A-B-C-D

Verified Solution

Answer & Solution

Correct Answer

(A) D-B-C-A

Step-by-step Solution

Detailed explanation

D-B-C-A

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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Match List-I with List-II

List-I	List-II
(A) The vectors \(\lambda \hat{i}+\hat{j}+2 \hat{k}\) and \(\hat{i}+\lambda \hat{j}+\hat{k}\) are perpendicular if \(\lambda\) is equal to	(I) 1
(B) The vectors \(3 \hat{i}+6 \hat{j}-\hat{k}\) and \(2 \hat{i}+\lambda \hat{j}-2 \hat{k}\) are collinear if \(\lambda\) is equal to	(II) -1
(C) The number of vectors of unit-length which are perpendicular to both the vectors \(\vec{a}=\hat{i}+\hat{j}+2 \hat{k}\) and \(\vec{b}=3 \hat{i}-\hat{j}+5 \hat{k}\) is	(III) \(2 / 3\)
(D) If \(\|\vec{a}\|=1\) and \(\vec{a}+\vec{b}=\overrightarrow{0}\), then \(\|\vec{b}\|\) is equal to	(IV) 2

Choose the correct answer from the options given below :

CUET 2025 Medium

Match List-I with List-II

List-I	List-II
(A) Degree of this differential equation \(\frac{d^4 y}{d x^4}+2 \log _e\left(\frac{d^3 y}{d x^3}\right)=0\)	(I) 1
(B) Order of this differential equation \(e^{\left(\frac{dy}{dx}\right)^3}+3 y\left(\frac{d^2 y}{d x^2}\right)^3=0\)	(II) 4
(C) Degree of \(\frac{d^4 y}{d x^4}+\left(\frac{d y}{d x}\right)^2=0\)	(III) not defined
(D) Order of the differential equation \(2 \frac{d^4 y}{d x^4}+\left(\frac{d^2 y}{d x^2}\right)^5=0\)	(IV) 2

Choose the Correct answer from the options given below :

CUET 2025 Hard

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