MCQOPTIONS
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MCQOPTIONS
This section includes 63 Mcqs, each offering curated multiple-choice questions to sharpen your 12th knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Which of the following solids are also called as super cooled liquids? |
| A. | Metallic solids |
| B. | Covalent solids |
| C. | Crystalline solids |
| D. | Amorphous solids |
| Answer» E. | |
| 52. |
In which of the following solids, ions of opposite charges are held together by strong electrostatic forces of attraction? |
| A. | Non metallic solids |
| B. | Covalent solids |
| C. | Ionic solids |
| D. | Metallic solids |
| Answer» D. Metallic solids | |
| 53. |
Which of the following is an amorphous solid? |
| A. | Salt |
| B. | Graphite |
| C. | Glass |
| D. | Diamond |
| Answer» D. Diamond | |
| 54. |
Potassium chloride is: |
| A. | Ionic solid |
| B. | Molecular solid |
| C. | Metallic solid |
| D. | Covalent solid |
| Answer» B. Molecular solid | |
| 55. |
Which type of solids are held by weak dispersion forces? |
| A. | Metallic solids |
| B. | Non polar molecular solids |
| C. | Covalent solids |
| D. | Polar molecular solids |
| Answer» C. Covalent solids | |
| 56. |
Which of the following solid is isotropic? |
| A. | Molecular |
| B. | Metallic |
| C. | Ionic |
| D. | Amorphous |
| Answer» E. | |
| 57. |
Why do metallic solids conducts electricity? |
| A. | Due to free or delocalised electrons. |
| B. | Due to loosely bounded particles |
| C. | Due to close packing of negative charge. |
| D. | Due to closely packed positive ions. |
| Answer» B. Due to loosely bounded particles | |
| 58. |
Which of the following is a covalent crystal? |
| A. | Rock salt |
| B. | Dry ice |
| C. | Ice |
| D. | Quartz |
| Answer» E. | |
| 59. |
Zinc sulphide is crystalline solid: |
| A. | Because of periodicity in definite arrangement of particles. |
| B. | Because of scattering particles. |
| C. | Because of large number of particles. |
| D. | Because of non periodicity in arrangement of particles. |
| Answer» B. Because of scattering particles. | |
| 60. |
Which of the following is NOT a property of an amorphous solid? |
| A. | They have a sharp melting point |
| B. | They are known as super cooled liquids. |
| C. | They do not have definite heat of fusion. |
| D. | They are isotropic in nature |
| Answer» B. They are known as super cooled liquids. | |
| 61. |
Dry ice is an example of: |
| A. | ionic solid |
| B. | metallic solid |
| C. | molecular solid |
| D. | covalent solid |
| Answer» D. covalent solid | |
| 62. |
Why ancient glass becomes milky? |
| A. | On ageing cracks develop. |
| B. | On ageing refractive index changes. |
| C. | On ageing amorphous nature increases. |
| D. | On ageing crystallization occurs. |
| Answer» E. | |
| 63. |
Why ice is a crystalline compound? |
| A. | Because water molecules are arranged in random way. |
| B. | Because water is condensed to form solid |
| C. | Because water molecules are arranged in cage like ordered structure. |
| D. | Because ice melts to form water. |
| Answer» D. Because ice melts to form water. | |