CTET Solved Paper - CTET September 2016 Paper2
71. Match the following metals and non-metals with their uses.
| Metals and Non-metals | Their Uses |
| A. Iodine | (i) Water purification |
| B. Mercury | (ii) On wounds |
| C. Aluminium | (iii) Thermometers |
| D. Chlorine | (iv) Food packaging |
(A) (B) (C) (D)
- Option : C
- Explanation : Iodine is used to treat the wounds. Mercury is filled in thermometer to check temperature. Aluminium is a food packaging material and chlorine is required in water purification.
72. Select the true statement from the following.
- Option : C
- Explanation : Both Bakelite and Metamine are the example of thermosetting polymers. due to extensive cross-linking, these polymers have strongest intermolecular forces and arc brittle as cross-linking reduces to mobility of polymer chain.
- Option : D
- Explanation : When sulphur dioxide gas is dissolves in water, it form sulphurous acid.
⇒ S02 + H20 → H2S03
74. Which process skills can be promoted through the above activity?
- Option : C
- Explanation : The given activity promotes observation, classification and different skills.
- Option : A
- Explanation : Viscosity is an important fluid property when analysing fluid motion. It is a measure of its resistance to flow. So the liquid which reaches the bottom earlier has less viscosity.
