#MCQ practice

ZOOLOGY

Which of the following statements about transformation is correct?

Transformation allows bacterial lls to take up foreign DNA, either naturally or through artificial methods like electroporation. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Principles of Inheritance, Molecular Basis of Inheritance and Biotechnology, Topic: Genetics, DNA techniques and applications.

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PHYSICS

The ripple in a rectifier output is reduced by using:

A capacitor filter smooths the pulsating DC output by charging during peaks and discharging during troughs, reducing AC ripples to provide a steadier DC voltage.

Ref: NCERT Physics Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII, continuing as per NCERT advisory for 2026-27),Topic: Fundamental laws, definitions and applications as per latest NCERT. The section explains governing laws, formulas like μ₀ = 4π.

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ZOOLOGY

Which transgenic animal is used to test the safety of polio vaccines?

Transgenic mice are used to test the safety of polio vaccines before human use. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

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BOTANY

Which of the following statements about translation is incorrect?

Translation does **not** convert **DNA** into protein; it converts **mRNA** into protein. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.

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Vitamins - Types, Coenzymes and Deficiency Diseases - Part 2

Which vitamin deficiency disrupts carboxylation reactions?

Vitamin H (Biotin) deficiency impairs carboxylation reactions, as it’s a coenzyme for carboxylases.

Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Vitamins - Types, Coenzymes and Deficiency Diseases - Part 2

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100

What is the general outer electronic configuration of group 17 elements?

Group 17 elements (halogens) have 7 valence electrons, with outer configuration ns² np⁵.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100

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100

Which group 16 element forms a dioxide that exists as a linear gas at room temperature?

In group 16, O₂ is a linear diatomic gas at room temperature, unlike SO₂ (bent), SeO₂ (polymeric solid), or TeO₂ (solid).

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100

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100

What is the formula of the compound formed between silicon and chlorine?

Si (group 14, valence 4) and Cl (group 17, valence 1) form SiCl₄, a covalent compound, by sharing electrons to complete octets.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100

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100

The atomic radius of which element is the largest among the following?

Atomic radius decreases across a period and increases down a group. Among F, Cl, Br, and I (group 17), Iodine (I), being lowest in the group, has the largest atomic radius.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100

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100

Which ion among the following has the highest effective nuclear charge for an isoelectronic series with 10 electrons?

For isoelectronic species (10 electrons), effective nuclear charge increases with atomic number. Al³⁺ (Z=13) has the highest effective nuclear charge compared to Na+, Mg²⁺, or F⁻.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100

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Medical Applications - Molecular Diagnosis - PCR ELISA

Which of the following is incorrect about molecular diagnostics?

Molecular diagnostics uses advanced techniques like PCR and DNA probes, not just microscopic_x000D_ observations, for accurate detection of diseases and genetic mutations.

Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Molecular Diagnosis - PCR ELISA

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Medical Applications - Molecular Diagnosis - PCR ELISA

Which of the following is incorrect about molecular diagnostics?

Molecular diagnostics uses advanced techniques like PCR, DNA probes, and sequencing, not just visual_x000D_ inspection, for accurate detection.

Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Molecular Diagnosis - PCR ELISA

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