9,793 previous year CISCE Board - ICSE Class 9 questions, grouped by year, with answers and solutions.
Constructors & Overloading: In 'Conditional Constructs in Java: if-else and switch-case', what distinguishes a constructor from a method?
Arrays (Sorting & Searching): In 'Conditional Constructs in Java: if-else and switch-case', what is the best-case time complexity of Binary Search on a sorted array?
Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:
Assertion (A): Danger signals on communication towers and traffic posts are always illuminated in red color.
Reason (R): Red light has the longest wavelength in the visible spectrum and suffers minimum Rayleigh scattering ($I \propto 1/\lambda^4$) through fog and smoke.
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 $D = b^2 - 4ac = 0$.
Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:
Assertion (A): A concave mirror can form both real inverted images and virtual erect images.
Reason (R): When an object is placed between the pole and focus of a concave mirror, it forms an erect, magnified, virtual image.
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