Kerala Board - Class 12 (Plus Two DHSE Board Exam) previous year questions (PYQ)

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 electrical conductivity of an intrinsic semiconductor increases with rise in temperature.

Reason (R): With increase in temperature, covalent bonds rupture, generating additional free conduction electrons and mobile holes.

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

Assertion (A): An aqueous solution of pure glucose does not conduct electric current.

Reason (R): Glucose is a covalent molecular compound that does not dissociate into free mobile ions in water.

ഗണിതം (LSS / പ്രൈമറി തലം): 'Probability (Conditional, Baye's Theorem)' സംബന്ധിച്ച ശരിയായ കണക്കുകൂട്ടൽ ഏതാണ്?

Advanced Research & Methodology: In scholarly analysis of 'Microbes in Human Welfare', which methodological approach ensures reproducibility and minimizes systematic bias?

Refer to the Case Study 'Case Study: Hazardous Enterprise and Supreme Court Doctrine of Absolute Liability' to answer:

What is the crucial legal distinction between the English rule of 'Strict Liability' and Indian 'Absolute Liability'?

സമയവും ദൂരവും (വേഗത): 'Integrals (Indefinite and Definite)' പ്രശ്നത്തിന്റെ ശരിയായ പരിഹാരം എന്താണ്?

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

Assertion (A): If two linear equations represent coincident lines, the system has infinitely many solutions.

Reason (R): Two lines $a_1x + b_1y + c_1 = 0$ and $a_2x + b_2y + c_2 = 0$ coincide when $\frac{a_1}{a_2} = \frac{b_1}{b_2} = \frac{c_1}{c_2}$.

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

Assertion (A): An aqueous solution of pure glucose does not conduct electric current.

Reason (R): Glucose is a covalent molecular compound that does not dissociate into free mobile ions in water.

Grammar: Choose the correct preposition or article for 'Current Electricity':

Tenses: Choose the correct past tense form for 'Reproduction in Organisms and Flowering Plants':

Refer to the Case Study 'Case Study: Parabolic Cable Geometry in Civil Engineering Suspension Bridges' to answer:

Using the tower coordinates $(x = 50\text{ m}, y = 25\text{ m})$, determine the value of the quadratic coefficient $a$.

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

Assertion (A): Electric current in a conductor is treated as a scalar physical quantity.

Reason (R): Although electric current has both magnitude and direction, it does not obey the laws of vector addition.

ഭിന്നസംഖ്യകൾ (Fractions - LSS Standard): 'Relations and Functions' ഭിന്നസംഖ്യയുടെ തുല്യരൂപം ഏതാണ്?

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

Assertion (A): Work done by an electrostatic field in moving a test charge along a closed path is zero.

Reason (R): The electrostatic Coulomb force is a conservative force whose line integral around any closed loop vanishes identically.

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

Assertion (A): If two linear equations represent coincident lines, the system has infinitely many solutions.

Reason (R): Two lines $a_1x + b_1y + c_1 = 0$ and $a_2x + b_2y + c_2 = 0$ coincide when $\frac{a_1}{a_2} = \frac{b_1}{b_2} = \frac{c_1}{c_2}$.

Refer to the Case Study 'Case Study: Optical Fibers and Total Internal Reflection in Medical Endoscopy' to answer:

What essential conditions must be satisfied for total internal reflection to occur within the optical fiber?

Which structure is primarily constructed across seasonal streams to slow water velocity and enhance groundwater recharge?