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.
| 1. |
When can anyone observe the Schottky defect? |
| A. | Density of the crystal is increased. |
| B. | An ion leaves its normal site and occupies an interstitial site |
| C. | Equal number of cations and anions are missing from the lattice. |
| D. | Unequal number of cations and anions are missing from the lattice. |
| Answer» D. Unequal number of cations and anions are missing from the lattice. | |
| 2. |
What will happen if sodium chloride is crystallised with a little amount of strontium chloride? |
| A. | It will create cationic vacancy. |
| B. | It will create metal deficiency |
| C. | It will crystallize more sodium ions. |
| D. | It will create anionic vacancy. |
| Answer» B. It will create metal deficiency | |
| 3. |
Which of the following substances are strongly attracted by magnetic field? |
| A. | Diamagnetic substances |
| B. | Paramagnetic substances |
| C. | Ferrimagnetic substances |
| D. | Ferromagnetic substances |
| Answer» E. | |
| 4. |
Germanium or silicon becomes semiconductor due to |
| A. | Frenkel defect |
| B. | Schottky defect |
| C. | Metal deficiency defect |
| D. | Chemical impurity |
| Answer» E. | |
| 5. |
A p-type conductor is created on doping silicon with |
| A. | As |
| B. | Al |
| C. | C |
| D. | P |
| Answer» C. C | |
| 6. |
Which of the following is NOT correct? |
| A. | Doping can be done with an impurity which is electron rich or electron deficient. |
| B. | Metals conduct electricity in solid as well as molten state. |
| C. | Molecular orbitals of the solids are close in energy to each other and form band. |
| D. | none of the above |
| Answer» E. | |
| 7. |
Which one of the following can be made n-type semiconductor only when doped with some group 15 elements like P or As? |
| A. | Cl |
| B. | Ne |
| C. | Si |
| D. | Mg |
| Answer» D. Mg | |
| 8. |
What is the new location of smaller ion in Frenkel defect? |
| A. | Interstitial defect |
| B. | Vacancy defect |
| C. | Metal deficiency defect |
| D. | Impurity defect |
| Answer» B. Vacancy defect | |
| 9. |
. If the anionic site is occupied by an electron and it becomes part of the lattice it is called |
| A. | E-centre |
| B. | F-centre |
| C. | D-centre |
| D. | T-centre |
| Answer» C. D-centre | |
| 10. |
How many valence electrons are required in impurity, to be added to silicon, to get an n-type semiconductor? |
| A. | 3 |
| B. | 1 |
| C. | 5 |
| D. | 2 |
| Answer» D. 2 | |
| 11. |
The forbidden gap between the valence band and conduction band is maximum in |
| A. | semiconductors. |
| B. | insulators. |
| C. | super conductors. |
| D. | conductors. |
| Answer» C. super conductors. | |
| 12. |
Which of the following substances are weakly repelled by magnetic field? |
| A. | Paramagnetic substances |
| B. | Ferromagnetic substances |
| C. | Diamagnetic substances |
| D. | All the above |
| Answer» D. All the above | |
| 13. |
Schottky defect in crystals is a type of: |
| A. | Vacancy defect |
| B. | Metal excess defect |
| C. | Interstitial defect |
| D. | Impurity defect |
| Answer» B. Metal excess defect | |
| 14. |
A solution in which no more solute can be dissolved at the given temperature and pressure is called a |
| A. | Saturated solution |
| B. | Solid solution |
| C. | Unsaturated solution |
| D. | Dilute solution |
| Answer» B. Solid solution | |
| 15. |
Which among the following statements is not true? |
| A. | When a solute is added to a solvent its particles go into the solution and its concentration increases in the solution |
| B. | A solution in which more solute can be dissolved at same temperature is called unsaturated solution |
| C. | A solution in which more solute can be dissolved at same temperature is called saturated solution |
| D. | None of the above |
| Answer» D. None of the above | |
| 16. |
A solution in which no more solute can be dissolved at a given temperature and pressure is called a saturated solution. At saturated solution stage equilibrium gets established among which two processes? |
| A. | Sublimation and crystallisation |
| B. | Dissolution and crystallisation |
| C. | Dissolution and condensation |
| D. | Evaporation and condensation |
| Answer» C. Dissolution and condensation | |
| 17. |
Dissolved gases can be removed from liquids by heating because: |
| A. | Solubility of gases decreases with decrease in temperature |
| B. | Solubility of gases decreases with increase in temperature |
| C. | Solubility of gases increases with decrease in temperature |
| D. | Solubility of gases increases with increase in temperature |
| Answer» C. Solubility of gases increases with decrease in temperature | |
| 18. |
Which of the following gases will be least soluble in water? |
| A. | Sulphur dioxide |
| B. | Oxygen |
| C. | Hydrogen chloride |
| D. | Ammonia |
| Answer» C. Hydrogen chloride | |
| 19. |
According to Henry's Law at a constant temperature the solubility of gas in a liquid is directly proportional to the |
| A. | Mass of gas |
| B. | Pressure of gas |
| C. | Density of gas |
| D. | Volume of gas |
| Answer» C. Density of gas | |
| 20. |
The value for Henry's constant for helium, hydrogen, nitrogen and oxygen at 293 K are 144.97 kbar, 69.16 kbar, 76.48 kbar and 34.86 kbar respectively. Which of the gas will be having maximum solubility? |
| A. | Helium |
| B. | Nitrogen |
| C. | Hydrogen |
| D. | Oxygen |
| Answer» E. | |
| 21. |
When a solid solute is added to solvent, some solute dissolves and its concentration increases in solution. This process is known as |
| A. | Solubility |
| B. | Crystallisation |
| C. | Dissolution |
| D. | Sublimation |
| Answer» D. Sublimation | |
| 22. |
The value for Henry’s constant for argon, carbon dioxide, methane and vinyl chloride at 298 K are 40.3 kbar, 1.67 kbar, 0.413 kbar and 0.611 kbar respectively. Which of the gas will be having least solubility? |
| A. | Carbon dioxide |
| B. | Argon |
| C. | Methane |
| D. | Vinyl chloride |
| Answer» C. Methane | |
| 23. |
If an atom is present in the edge centre of a unit cell, it will be shared by how many cubes? |
| A. | 3 cubes |
| B. | 4 cubes |
| C. | 6 cubes |
| D. | 2 cubes |
| Answer» C. 6 cubes | |
| 24. |
In a simple cubic unit cell, how many corners are occupied by constituent particles? |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 2 |
| Answer» D. 2 | |
| 25. |
Face centered and body centered unit cell are types of |
| A. | Primitive unit cell. |
| B. | End centred unit cell. |
| C. | Centred unit cell. |
| D. | Non centred unit cell. |
| Answer» D. Non centred unit cell. | |
| 26. |
How many atoms are present in a face centred cubic unit cell? |
| A. | 6 atoms |
| B. | 2 atoms |
| C. | 3 atoms |
| D. | 4 atoms |
| Answer» E. | |
| 27. |
In a body centred unit cell, the particles are present at |
| A. | corners & all faces are occupied. |
| B. | corners & body centre is occupied. |
| C. | corners & any 2 opposite faces are occupied. |
| D. | corners & all edges are occupied. |
| Answer» C. corners & any 2 opposite faces are occupied. | |
| 28. |
How many atoms are present in end centred cubic unit cell? |
| A. | 3 atoms |
| B. | 2 atoms |
| C. | 6 atoms |
| D. | 4 atoms |
| Answer» C. 6 atoms | |
| 29. |
Which is the most unsymmetrical crystal system? |
| A. | Triclinic crystal system |
| B. | Monoclinic crystal system |
| C. | Orthorhombic crystal system |
| D. | Cubic crystal system |
| Answer» B. Monoclinic crystal system | |
| 30. |
In a primitive unit cell the particles occupies |
| A. | only corners. |
| B. | only face centres. |
| C. | only body centres. |
| D. | only edges. |
| Answer» B. only face centres. | |
| 31. |
How can you best describe a unit cell? |
| A. | Arrangement of lattice point in 2D. |
| B. | Arrangement of lattice point in 3D. |
| C. | Arrangement of lattice point in 1D |
| D. | Arrangement of lattice point in any one direction. |
| Answer» C. Arrangement of lattice point in 1D | |
| 32. |
If atoms are present on each of face centre, each corner and in body centre of a unit cell then, what will be the number of atoms present in that unit cell? |
| A. | 7 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 33. |
Centered unit cells can be classified into how many types? |
| A. | 7 |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» C. 2 | |
| 34. |
Primitive unit cells are classified into how many types of crystal systems? |
| A. | 7 |
| B. | 4 |
| C. | 6 |
| D. | 2 |
| Answer» B. 4 | |
| 35. |
An atom present at the face centre is shared by how many unit cells? |
| A. | 5 |
| B. | 3 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 36. |
Which of the following system has all unequal edge lengths and all bond angles equal? |
| A. | Monoclinic crystal system |
| B. | Cubic crystal system |
| C. | Orthorhombic crystal system |
| D. | Triclinic crystal system |
| Answer» D. Triclinic crystal system | |
| 37. |
What are the basic particles of ice crystals? |
| A. | cations |
| B. | atoms |
| C. | molecules |
| D. | anions |
| Answer» D. anions | |
| 38. |
Which of the following is a non-conductor in solid state but good conductor in molten state? |
| A. | Sodium |
| B. | Potassium chloride |
| C. | Silicon dioxide |
| D. | Diamond |
| Answer» C. Silicon dioxide | |
| 39. |
Which state of matter is incompressible? |
| A. | vapours |
| B. | gas |
| C. | liquid |
| D. | solid |
| Answer» E. | |
| 40. |
The intermolecular forces existing between two non polar molecules are called |
| A. | London or dispersion forces |
| B. | electrostatic forces |
| C. | electrostatic forces |
| D. | dipole-dipole forces |
| Answer» B. electrostatic forces | |
| 41. |
The crystalline solids are: |
| A. | anisotropic |
| B. | Atropic |
| C. | Enantiotropic |
| D. | Isotropic |
| Answer» B. Atropic | |
| 42. |
Which of the following is NOT true for solid crystals? |
| A. | Solid crystals have strong intermolecular forces. |
| B. | Solid crystals have definite mass and volume. |
| C. | Solid crystals have fixed positions of the constituent particles. |
| D. | Solid crystals have large intermolecular distances. |
| Answer» E. | |
| 43. |
What are the basic constituent particles forming diamond crystals? |
| A. | Anions |
| B. | Molecules |
| C. | Atoms |
| D. | Cations |
| Answer» D. Cations | |
| 44. |
Quartz is: |
| A. | Metallic solid |
| B. | Molecular solid |
| C. | Covalent solid |
| D. | Ionic solid |
| Answer» D. Ionic solid | |
| 45. |
Hydrogen bonding occurs in which type of crystalline solids? |
| A. | Metallic solids |
| B. | Ionic solids |
| C. | Network solids |
| D. | Molecular solids |
| Answer» E. | |
| 46. |
Amorphous solids are also known as |
| A. | Isoenthalpic and superheated liquids |
| B. | Isotropic and super cooled liquids |
| C. | Isotropic and superheated solids |
| D. | Anisotropic and super cooled liquids |
| Answer» C. Isotropic and superheated solids | |
| 47. |
Which of the following properties is NOT exhibited by metallic solids? |
| A. | Low Boiling Point |
| B. | Electrical Conductivity |
| C. | Ductility |
| D. | Malleability |
| Answer» B. Electrical Conductivity | |
| 48. |
How can anyone differentiate crystalline and amorphous solids? |
| A. | On the basis of number of particles. |
| B. | On the basis of arrangement of particles. |
| C. | On the basis of size of particles. |
| D. | On the basis of types of atoms. |
| Answer» C. On the basis of size of particles. | |
| 49. |
Why some of the physical properties of solids show different values when measured along different directions in the same crystals? |
| A. | Because solid crystals are anisotropic. |
| B. | Because solid crystals have short bond distances. |
| C. | Because solid crystals are isotropic. |
| D. | Because solid crystals are rigid. |
| Answer» B. Because solid crystals have short bond distances. | |
| 50. |
Which of the following crystalline solids have highest melting point? |
| A. | diamond |
| B. | sulphur |
| C. | ice |
| D. | zinc |
| Answer» B. sulphur | |