| Column I | Column II | ||
| (a) | Chlamydomonas | (iii) | Algae |
| (b) | Cycas | (iv) | Gymnosperm |
| (c) | Selaginella | (ii) | Pteridophyte |
| (d) | Sphagnum | (i) | Moss |
Figure 8.9 shows the strain-stress curve for a given material. What are (a) Young’s modulus and (b) approximate yield strength for this material?

Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following (Fig. 5.14) is a possible result after collision ?
