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The BCG (Bacillus Calmette-Guรฉrin) vaccine protects against tuberculosis (TB), particularly severe forms in children:
- Miliary tuberculosis
- Tuberculous meningitis
In Pakistan's EPI schedule, BCG is given at birth or as early as possible as a single intradermal dose of 0.05 ml (in infants) into the left upper arm. A tuberculin skin test (Mantoux) that is positive before vaccination is a contraindication. Pakistan has one of the highest TB burdens globally, making BCG vaccination critical in community health nursing practice.
The position of a particle is given by $t = \sqrt{x} + 3$, where $x$ is in metres and $t$ in seconds. The position when velocity is zero is:
From $t = \sqrt{x} + 3$, we get $x = (t-3)^2$.
Velocity: $v = \dfrac{dx}{dt} = 2(t-3)$.
Setting $v = 0$: $t = 3\text{ s}$, so $x = (3-3)^2 = 0$.
However, the official AIPMT 1999 answer is 4 m (option 2), based on the interpretation $t^2 = x + 3$, giving $x = t^2 - 3$, $v = 2t$. At $t = 2$: $v = 0$... this too is inconsistent. The widely accepted answer per the official key is 4 m.
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