Madhya Pradesh Board - Class 12 (Higher Secondary Board Exam) previous year questions (PYQ)

जल संरक्षण एवं प्रयोग (Water Conservation): 'वंशागति के आण्विक आधार (DNA की संरचना, प्रतिकृतियन, अनुलेखन, आनुवंशिक कूट, अनुवाद / प्रोटीन संश्लेषण, लैक ओपेरॉन)' द्वारा जल की बचत कैसे की जा सकती है?

जल संरक्षण एवं प्रयोग (Water Conservation): 'वंशागति के आण्विक आधार (DNA की संरचना, प्रतिकृतियन, अनुलेखन, आनुवंशिक कूट, अनुवाद / प्रोटीन संश्लेषण, लैक ओपेरॉन)' द्वारा जल की बचत कैसे की जा सकती है?

Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): Heavy water ($D_2O$) is utilized as a moderator in thermal nuclear power reactors.

Reason (R): Deuterium nuclei slow down energetic fission neutrons through elastic collisions without substantial parasitic neutron absorption.

जल संरक्षण एवं प्रयोग (Water Conservation): 'स्थिरवैद्युत विभव तथा धारिता (समविभव पृष्ठ, संधारित्र, समांतर पट्ट संधारित्र की धारिता)' द्वारा जल की बचत कैसे की जा सकती है?

Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): The quadratic equation $x^2 - 6x + 9 = 0$ has real and equal roots.

Reason (R): A quadratic equation $ax^2 + bx + c = 0$ has real and equal roots if and only if its discriminant $D = b^2 - 4ac = 0$.

Refer to the Case Study 'Case Study: Recombinant Human Insulin Synthesis in Modern Biotechnology' to answer:

Why is human insulin synthesized via recombinant DNA technology superior to animal-derived insulin?

Refer to the Case Study 'Case Study: Recombinant Human Insulin Synthesis in Modern Biotechnology' to answer:

In natural proinsulin produced by human pancreatic $\beta$-cells, which extra peptide sequence is present and cleaved during maturation?

Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): Noble gases possess positive or zero electron gain enthalpy.

Reason (R): Noble gases have completely filled stable electronic valence shell configurations ($ns^2 np^6$).