Science Objective Questions (Series – 1)
Q. 1. The life span of WBCs is (a). 4 to 5 days (b). 120 days (c). 70 days (d). About a week Q. 2. The focal length of a mirror is -10cm. What will be its nature? (a). Convex mirror (b). Concave mirror (c). Plane mirror (d). None of these Q. 3. Rusting of iron is which type of chemical reaction? (a). Fast reaction (b). Slow reaction (c). Moderate reaction (d). None of these Q. 4. Metallic lusture presents in (a). Metals (b). Non- metals (c). Semi-metals (d). None of these Q. 5. Which enzyme is present in saliva? (a). Ptyalin (b). Pepsin (c). Lipase (d). None of these Q. 6. The life span of platelets is (a). About a week (b). 120 days (c). 80 days (d). 150 days Q. 7. A transparent medium bounded by two surfaces is called, (a). Lens (b). Prism (c). Glass slab (d). None of these Q. 8. Haemoglobin pigment is present in (a). RBCs (b). WBCs (c). Platelets (d). None of these Q