Abbasi Educational Academy

MDCAT Level MCQs – Solids
Q1. The rigidity of a solid is mainly due to:
A. High kinetic energy of particles
B. Large intermolecular spaces
C. Strong intermolecular forces and fixed positions
D. Random arrangement of particles
Ans: C
Q2. Which statement correctly explains the negligible diffusion in solids?
A. Particles are too heavy
B. Temperature is always low
C. Particles only vibrate about fixed positions
D. Solids lack kinetic energy
Ans: C
Q3. Which solid will show maximum compressibility?
A. Ionic solid
B. Metallic solid
C. Covalent network solid
D. Molecular solid
Ans: D
Q4. The melting of crystalline solids occurs at a fixed temperature because:
A. Intermolecular forces are absent
B. Lattice energy is uniform throughout the crystal
C. Particles are randomly arranged
D. They behave as super-cooled liquids
Ans: B
Q5. Which factor does NOT affect the strength of a solid?
A. Nature of bonding
B. Interparticle distance
C. Shape of container
D. Crystal structure
Ans: C
Types of Solids
Q6. Which solid conducts electricity in solid as well as molten state?
A. NaCl
B. Cu
C. Diamond
D. Ice
Ans: B
Q7. The hardness of diamond is due to:
A. Presence of free electrons
B. Strong van der Waals forces
C. Three-dimensional covalent network
D. Ionic bonding
Ans: C
Q8. Which solid has directional bonding?
A. Metallic solids
B. Ionic solids
C. Covalent solids
D. Molecular solids
Ans: C
Q9. Which of the following is NOT a molecular solid?
A. Iodine
B. Ice
C. Dry ice
D. Silicon carbide
Ans: D
Q10. Ionic solids are generally brittle because:
A. Ions are mobile
B. Like charges come close on applying force
C. Metallic bonding is weak
D. They contain molecules
Ans: B
Crystalline vs Amorphous Solids
Q11. Long-range order is a characteristic feature of:
A. Amorphous solids
B. Super-cooled liquids
C. Crystalline solids
D. Glass only
Ans: C
Q12. Amorphous solids differ from crystalline solids in that they:
A. Are rigid
B. Have definite volume
C. Show isotropic behavior
D. Have strong bonding
Ans: C
Q13. Glass shows gradual softening on heating because:
A. It has low density
B. It lacks long-range order
C. It is ionic in nature
D. It is crystalline
Ans: B
Q14. Which property proves anisotropy in crystals?
A. Same refractive index in all directions
B. Direction-dependent electrical conductivity
C. Random arrangement
D. No lattice structure
Ans: B
Q15. Which statement is TRUE for amorphous solids?
A. Sharp melting point
B. Long-range periodicity
C. Irregular cleavage
D. True equilibrium state
Ans: C
Isomorphism & Polymorphism
Q16. Isomorphous substances must have:
A. Same chemical composition
B. Same physical properties
C. Different composition but similar crystal structure
D. Same melting point
Ans: C
Q17. Which pair shows isomorphism?
A. NaCl and KCl
B. Diamond and graphite
C. Ice and steam
D. Quartz and glass
Ans: A
Q18. Polymorphism is the ability of a substance to:
A. Exist in solid and liquid states
B. Form different chemical compounds
C. Crystallize in more than one form
D. Become amorphous on heating
Ans: C
Q19. Which condition mainly affects polymorphic transitions?
A. Colour and density
B. Temperature and pressure
C. Molecular mass
D. Electrical conductivity
Ans: B
Q20. The difference between diamond and graphite is due to:
A. Different atomic masses
B. Different chemical compositions
C. Different crystal structures
D. Presence of impurities
Ans: C
High-Logic / MDCAT Tricky
Q21. Graphite conducts electricity because:
A. It has ionic bonds
B. It contains free electrons within layers
C. It is metallic
D. It is amorphous
Ans: B
Q22. Which solid has the highest melting point?
A. NaCl
B. Ice
C. Diamond
D. Iodine
Ans: C
Q23. The term “super-cooled liquid” is used for:
A. Crystalline solids
B. Ionic solids
C. Amorphous solids
D. Metallic solids
Ans: C
Q24. Which property distinguishes crystalline solids from amorphous solids most effectively?
A. Rigidity
B. Definite shape
C. Cleavage along definite planes
D. Volume
Ans: C
Q25. A solid that breaks into irregular fragments on cutting is most likely:
A. Crystalline
B. Ionic
C. Metallic
D. Amorphous
Ans: D

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