chemistry : class12 Anisotropy : Crystalline solids : Solid State MCQ Questions and Answers
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Anisotropy
MCQ questions and answers.
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MCQ Questions
1. What is anisotropy in crystalline solids?
A.
The same physical properties in all directions
B.
Different physical properties in different directions
C.
The absence of a regular arrangement of particles
D.
The conversion of a solid into a liquid
Correct Answer:
Different physical properties in different directions
Explanation:
Anisotropy means that a crystalline solid exhibits different physical properties, such as electrical or thermal conductivity, when measured in different directions.
2. Anisotropy in crystals is mainly due to the:
A.
Random arrangement of particles
B.
Regular arrangement of particles in different directions
C.
Complete absence of particles
D.
Liquid nature of crystals
Correct Answer:
Regular arrangement of particles in different directions
Explanation:
The regular and direction-dependent arrangement of particles in a crystal causes its physical properties to vary with direction.
3. Which type of solids generally shows anisotropy?
A.
Crystalline solids
B.
Amorphous solids
C.
Gases
D.
Liquids
Correct Answer:
Crystalline solids
Explanation:
Crystalline solids generally show anisotropy because their particles are arranged in a regular repeating pattern that differs along different directions.
4. A crystal shows different electrical conductivity along different directions. This property is called:
A.
Isotropy
B.
Anisotropy
C.
Fluidity
D.
Elasticity
Correct Answer:
Anisotropy
Explanation:
The directional variation of electrical conductivity is an example of anisotropy.
5. Which observation is evidence of anisotropy in a crystal?
A.
Equal hardness in every direction
B.
Different hardness along different crystal directions
C.
No definite arrangement of particles
D.
Complete absence of cleavage
Correct Answer:
Different hardness along different crystal directions
Explanation:
When hardness changes with the direction in which it is measured, the crystal is showing anisotropy.
6. The refractive index of an anisotropic crystal:
A.
Is always zero
B.
May vary with direction
C.
Is independent of the crystal structure
D.
Is always the same as that of air
Correct Answer:
May vary with direction
Explanation:
Optical properties such as refractive index can have different values in different directions in an anisotropic crystal.
7. Anisotropy is a characteristic feature of crystals because crystals possess:
A.
Long-range order
B.
No internal structure
C.
Only short-range order
D.
Randomly moving particles
Correct Answer:
Long-range order
Explanation:
The long-range, ordered arrangement of particles in crystalline solids produces direction-dependent properties, known as anisotropy.
8. If a crystal conducts heat differently along two directions, it is showing anisotropy of:
A.
Thermal conductivity
B.
Colour only
C.
Mass
D.
Volume only
Correct Answer:
Thermal conductivity
Explanation:
A difference in heat conduction along different directions is called anisotropy of thermal conductivity.
9. Which statement correctly describes an anisotropic crystal?
A.
Its properties are identical in every direction
B.
Its properties depend on the direction of measurement
C.
It has no fixed shape
D.
It cannot form a regular structure
Correct Answer:
Its properties depend on the direction of measurement
Explanation:
In an anisotropic crystal, the measured value of a physical property depends on the direction in which it is measured.
10. A crystal has different magnetic behaviour in different directions. This is an example of:
A.
Anisotropy
B.
Isotropy
C.
Melting
D.
Diffusion
Correct Answer:
Anisotropy
Explanation:
Directional variation in magnetic behaviour is a physical manifestation of anisotropy in crystalline solids.
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