6,346 previous year Rajasthan Board - Class 12 (Senior Secondary Board Exam) questions, grouped by year, with answers and solutions.
Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:
Assertion (A): DNA replication in all prokaryotic and eukaryotic organisms is semi-conservative.
Reason (R): Each daughter double helix retains one intact parental template strand and one newly synthesized complementary strand.
पर्यावरण अध्ययन (अपना परिवेश): 'विद्युत धारा (Current Electricity - किरचॉफ के नियम, व्हीટસ્ટોન सेतु)' का हमारे पर्यावरण व स्वास्थ्य से क्या संबंध 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): Systemic arteries have thick, elastic muscular walls compared to veins.
Reason (R): Arterial blood flows under high, pulsatile hydrostatic pressure generated by ventricular systole.
जल संरक्षण: राजस्थान में 'जनन स्वास्थ्य (Reproductive Health)' (बावड़ी, टांका, जोहड़) का क्या महत्व 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 square root of 2 ($\sqrt{2}$) is an irrational real number.
Reason (R): The square root of any positive prime integer is an irrational number.
मानचित्र ज्ञान: राजस्थान के मानचित्र में 'वैद्युतरसायन (Electrochemistry - नेर्नस्ट समीकरण, फैराडे के नियम, ईंधन सेल)' जिला किस दिशा या संभाग में स्थित है?
Refer to the Case Study 'Case Study: Recombinant Human Insulin Synthesis in Modern Biotechnology' to answer:
What chemical bonds cross-link Chain A and Chain B to stabilize the functional tertiary structure of human insulin?
Refer to the Case Study 'Case Study: Parabolic Cable Geometry in Civil Engineering Suspension Bridges' to answer:
What geometric property distinguishes the vertex of the upward-opening parabola $y = ax^2 + c$ ($a > 0$)?
Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:
Assertion (A): Gastric enzyme pepsin requires an acidic environment to digest dietary proteins.
Reason (R): Hydrochloric acid secreted by parietal cells creates optimum pH (1.5 to 2.0) and cleaves inactive pepsinogen into active pepsin.
Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:
Assertion (A): Systemic arteries have thick, elastic muscular walls compared to veins.
Reason (R): Arterial blood flows under high, pulsatile hydrostatic pressure generated by ventricular systole.
पर्यावरण अध्ययन (अपना परिवेश): 'विकास (Evolution)' का हमारे पर्यावरण व स्वास्थ्य से क्या संबंध है?
Directions: In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:
Assertion (A): The quadratic equation $2x^2 - 4x + 3 = 0$ has no real roots.
Reason (R): The discriminant $D = b^2 - 4ac$ for this equation is $(-4)^2 - 4(2)(3) = 16 - 24 = -8 < 0$.
Refer to the Case Study 'Case Study: Recombinant Human Insulin Synthesis in Modern Biotechnology' to answer:
What chemical bonds cross-link Chain A and Chain B to stabilize the functional tertiary structure of human insulin?
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