Science Exam: 12th Grade Quiz!
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- 1.Which of the following condition favors the existence of a substance in the solid-state?
- A.
High temperature
- B.
Low temperature
- C.
High thermal energy
- D.
Weak cohesive forces
- 2.Which of the following is not a characteristic of a crystalline solid?
- A.
Definite and characteristic heat of fusion
- B.
Isotropic nature
- C.
A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal
- D.
A true solid
- 3.Which of the following is an amorphous solid?
- A.
Graphite
- B.
Quartz glass
- C.
Chrome alum
- D.
Silicon carbide
- 4.Which of the following is true about the value of the refractive index of quartz glass?
- A.
Same in all directions
- B.
Different in different directions
- C.
Cannot be measured
- D.
Always zero
- 5.Which of the following statement is not true about amorphous solids?
- A.
On heating they may become crystalline at certain temperature
- B.
They may become crystalline on keeping for a long time
- C.
Amorphous solids can be moulded by heating
- D.
They are anisotropic in nature
- 6.The sharp melting point of crystalline solids is due to
- A.
A regular arrangement of constituent particles observed over a short distance in the crystal lattice
- B.
A regular arrangement of constituent particles observed over a long distance in the crystal lattice
- C.
Same arrangement of constituent particles in different directions
- D.
Different arrangement of constituent particles in different directions
- 7.Iodine molecules are held in the crystals lattice by:
- A.
London forces
- B.
Dipole-dipole interactions
- C.
Covalent bonds
- D.
Coulombic forces
- 8.Which of the following is a network solid?
- A.
S02
- B.
I2
- C.
Diamond
- D.
H2O
- 9.The total number of tetrahedral voids in the face-centered unit cell is:
- A.
6
- B.
10
- C.
8
- D.
12
- 10.Which of the following point defects are shown by AgBr (s) crystals? (A) Schottky defect (B) Frenkel defect (C) Metal excess defect (D) Metal deficiency defect
- A.
A and B
- B.
C and D
- C.
A and C
- D.
B and D
- 11.The percentage of empty space in a body-centered cubic arrangement is:
- A.
74
- B.
68
- C.
32
- D.
26
Questions: 10 | Attempts: 1992 | Last updated: Mar 21, 2022
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