NIOS Class 12 Physics — Flashcards

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. Amo

A: Given: Frequency = 1370 kHz Find: Frequency in GHz Step 1: Convert kHz to Hz 1370 kHz = 1370 × 10³ Hz = 1.370 × 10⁶ Hz Step 2: Convert Hz to GHz 1 GHz = 10⁹ Hz ∴ Frequency = 1.370 × 10⁶ / 10⁹ GHz =

A: (a) 426.69 → 5 significant figures Rule: All non-zero digits are significant. (b) 4200304.002 → 10 significant figures Rule: All zeros between non-zero digits are significant. (c) 0.3040 → 4 s

A: Distance is the total length of the path covered by a body - it is a scalar quantity (only magnitude). Displacement is the shortest distance between initial and final positions with a specific directi

A: Given: Total distance = 400m, Displacement = 0m (returns to start), Time = 60s Average speed = Total distance / Time = 400m / 60s = 6.67 m/s Average velocity = Displacement / Time = 0m / 60s = 0 m/s K

A: Instantaneous velocity is the velocity of an object at a specific instant of time or at a particular point on its path. It is the limit of average velocity as the time interval approaches zero: v = li

A: Newton's First Law: A body continues to be in a state of rest or of uniform motion in a straight line unless acted upon by a net external force. Physical Property Introduced: INERTIA — the tendency o

A: Inertia: The property of a body by which it resists any change in its state of rest or uniform motion in a straight line. Relation with Mass: Mass is the quantitative measure of inertia. A heavier bo

A: Newton's Second Law: The rate of change of momentum of a body is directly proportional to the net external force acting on it, and the change occurs in the direction of the force. Derivation: Step 1: