Kerala Board Class 12 Physics — Flashcards for Quick Revision

A: A fundamental quantity is a physical quantity that is independent of other quantities and cannot be derived from them. Examples: 1. Length - metre (m) 2. Mass - kilogram (kg) 3. Time - second (s) Thes

A: Given: Length = 15.6 m (3 significant figures) Breadth = 8.25 m (3 significant figures) Area = Length × Breadth Area = 15.6 × 8.25 = 128.7 m² Since both measurements have 3 significant figures, the

A: The seven base SI units are: 1. Length - metre (m) 2. Mass - kilogram (kg) 3. Time - second (s) 4. Electric current - ampere (A) 5. Temperature - kelvin (K) 6. Luminous intensity - candela (cd) 7. Qua

A: The near point is the minimum distance from the eye at which an object can be seen clearly without strain. For a normal young eye, it is about 7-8 cm, but increases with age to 100-200 cm or more in e

A: The least distance of distinct vision is the distance up to which the human eye can see objects clearly without any strain. For a normal human eye, this distance is taken as D = 25 cm. This is used as

A: Angular magnification (magnifying power) = ratio of angle subtended by image at eye to angle subtended by object at unaided eye when both are at least distance of distinct vision. Linear magnification

A: Distance is the total path length covered by an object (scalar quantity with only magnitude). Displacement is the shortest distance between initial and final positions with direction (vector quantity)

A: Average velocity is the displacement per unit time. Formula: v̄ = (x₂ - x₁)/(t₂ - t₁) = Δx/Δt. SI unit: ms⁻¹. It is a vector quantity and can be positive or negative depending on direction.

A: Given: First motion: 120m north in 3s; Second motion: 60m south in 2s Total distance = 120 + 60 = 180m Total displacement = 120 - 60 = 60m north Total time = 3 + 2 = 5s Average speed = 180/5 = 36 ms⁻¹