1 |
The crystalline structure of NaCl is. |
Cubical
Hexagonal
Tri gonal
Tetragonal
|
2 |
The number of crystal system are |
Three
Five
Seven
Fifteen
|
3 |
There are different crystal systems. The number of these crystal system is. |
3
4
5
7
|
4 |
Which one of the following is crystalline solid. |
Zirconia
Glassy solid
Natural rubber
Poly strene
|
5 |
Which one is not a crystalline solid. |
Zinc
Copper
Nylon
None of these
|
6 |
A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking? |
25 m
1mm
2mm
0.5 m
|
7 |
Curie temperature is a point where : |
Diamagnetism changes to paramagnetism
Paramagnetism changes to Diamagnetism
Ferromagnetism changes to paramagnetism
Paramagnetism changes to Ferromagnetism
|
8 |
If both the length and radius of the rod are doubled, then the modulus of elasticity will: |
Increase
Decrease
Remains the same
Doubled
|
9 |
Which of the modulus of elasticity is involved in compressing a rod to decrease its length ? |
Young's modulus
Bulk modulus
Modulus of elasticity
None of these
|
10 |
Which of the modulus of elasticity is involved in compressing a rod to decrease its length ? |
Young's modulus
Bulk modulus
Modulus of elasticity
None of these
|
11 |
A wire stretched to double of its length, its strain is: |
2
1
0
0.5
|
12 |
Recently superconductor discovered is at temperature. |
110K
143K
16.3K
119K
|
13 |
The first superconductor was discovered in: |
1831
1911
1921
1876
|
14 |
Those materials whose resistivity becomes zero at certain temperature is called: |
Semiconductor
Super conductor
Conductor
Insulator
|
15 |
Insulators have: |
An empty conduction band
Al full valence band
A large energy gap
All of above
|
16 |
A semiconductor in its extremely pure form is known as: |
Intrinsic
Extrinsic
Both a and b
None of above
|
17 |
The temperature at which, semiconductor behaves as insulators: |
10k
0k
237k
None of above
|