61). Match the following:
A. Isotopes 1. Atoms having same atomic number but different atomic numbers
B. Isobars 2. Atoms with same number of neutrons but different atomic numbers
C. Isotones 3. Atoms with same mass numbers but different atomic numbers
Below options are given in A B C order.
| A). 1 2 3 |
| B). 1 3 2 |
| C). 2 3 1 |
| D). 2 1 3 |
|
62). An atom of an element with mass numbers 23 and atomic number 11 will have:
| A). 11 neutrons, 12 protons and 11 electrons |
| B). 11 protons, 12 neutrons and 11 electrons |
| C). 11 neutrons, 11 protons and 12 electrons |
| D). 23 protons and 11 electrons |
|
63). Match the following:
Compound added Colour imparted to glass
A. Manganese dioxide 1. Yellow
B. Selenium oxide 2. Green
C. Chromium oxide 3. Red
D. Iron oxide 4. Purple
Below options are given in A B C D order.
| A). 1 2 3 4 |
| B). 2 3 1 4 |
| C). 3 1 4 2 |
| D). 4 3 2 1 |
|
64). Which variety of glass is heat resistant?
| A). Hand glass |
| B). Flint glass |
| C). Pyrex glass |
| D). Bottle glass |
|
65). Bagasse, a by-product of sugar manufacturing industry, is used for the production of :
| A). nylon |
| B). glass |
| C). paper |
| D). alcohol |
|
66). What are soaps?
| A). Salts of silicates |
| B). Esters of heavy fatty acids |
| C). Sodium or potassium salts of heavier fatty acids |
| D). Mixture of glycerol and alcohols |
|
67). In vulcanisation, natural rubber is heated with :
| A). Carbon |
| B). Sulphur |
| C). Silicon |
| D). Phosphorus |
|
68). Which of the following is used as a filler in rubber tyres?
| A). Graphite |
| B). Coal |
| C). Coke |
| D). Carbon black |
|
69). Which is/are the important raw material(s) required in cement industry?
| A). Limestone |
| B). Gypsum and clay |
| C). Clay |
| D). Limestone and clay |
|
70). When synthetic fibre is known as artificial silk?
| A). Cotton |
| B). Rayon |
| C). Terylene |
| D). Nylon |
|
