1. Figure shows graphs between the applied force the acceleration. Out of these which one is the graph for motion of a body on smooth and rough surfaces?
---image----
a) p and q
b) r and s
c) q and r
d) p and s

---

2. An auditorium has volume $10^{5}m^{3}$ and surface area of absorption $2 \times 10^{4}m^{2}$. Its average absorption coefficent is 0.2. The reverberation time of the auditorium in seconds is
a) 6.5
b) 5.5
c) 4.25
d) 3.25

---