Tamil Nadu Board - Class 9 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): Under the Constitution of India, the judiciary enjoys structural independence from executive and legislative interference.

Reason (R): Judges of the Supreme Court and High Courts have security of tenure and their judicial salaries are charged directly to the Consolidated Fund of India.

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.

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.

Optics & Human Eye: Which corrective lens is prescribed for myopia (short-sightedness) in 'Electric Charge and Current'?

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): 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.

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): An employer is vicariously liable for tortious civil wrongs committed by an employee during the authorized course of employment.

Reason (R): The doctrine of vicarious liability is founded on the legal maxims *respondeat superior* (let the master answer) and *qui facit per alium facit per se*.

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

Assertion (A): Money serves as an indispensable medium of exchange in modern market economies.

Reason (R): Money eliminates the need for double coincidence of wants inherent in barter trade systems.