Match the concepts in List-I with their correct examples in List-II:
| List-I (Concept) | List-II (Example) |
|---|---|
| a. Balanced forces | 1. Recoil of a gun when a bullet is fired |
| b. First law of motion | 2. A wooden block pulled equally from both sides remains at rest |
| c. Second law of motion | 3. A passenger falls backwards when the bus starts moving from rest |
| d. Third law of motion | 4. A fielder pulls his hands back gradually while catching a fast-moving ball |
Codes:
- Aa-2, b-3, c-4, d-1
- Ba-2, b-4, c-3, d-1
- Ca-1, b-3, c-4, d-2
- Da-1, b-4, c-3, d-2
Show answer and explanation
Correct answer: (a) a-2, b-3, c-4, d-1
Explanation
- (a) Balanced forces → 2: a block pulled equally from both sides has zero net force, so it stays at rest.
- (b) First law (inertia) → 3: when a bus starts suddenly, the lower body moves with the bus but the upper body tends to stay at rest, so the passenger falls backwards.
- (c) Second law → 4: force = rate of change of momentum. A fielder moves the hands back to increase the time of catching, which reduces the force on the hands.
- (d) Third law → 1: the bullet is pushed forward (action) and the gun is pushed back (reaction), so the gun recoils.
So the code is a-2, b-3, c-4, d-1.