ECAT Pre Engineering Physics Chapter 17 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 17 Physics of Solid

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 17 Physics of Solid

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Physics ECAT Pre Engineering Chapter 17 Physics of Solid

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Question # 1

The bands below the valence band are

Question # 2

When a stress changes the shape, it is called the

Question # 3

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

Question # 4

The critical temperature of aluminium is

Question # 5

Above the curie temperature, iron becomes

Question # 6

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

Question # 7

The neighbours of every molecule in crystalline solids are arranged in

Question # 8

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

Question # 9

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

Question # 10

Whenever a covalent bond is broken in an intrinsic semi-conductor

Question # 11

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

Question # 12

The domains are of macroscopic size of the order of

Question # 13

Synthetic materials fall into the category of

Question # 14

Zirconia is classified as:

Question # 15

Amorphous solids are also more like

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Sr.# Question Answer
1 The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called
A. diamagnetic substances
B. ferromagnetic substances
C. paramagnetic substances
D. all of them
2 The force applied on unit area to produce any change in the shape, volume or length of a body is known as
A. strain
B. elasticity
C. stretching
D. stress
3 When relatively simple molecules are chemically combined into massive molecules, the reaction is called:
A. Fission reaction
B. Fusion reaction
C. Polymerization
D. Any of these
4 When a stress changes the shape, it is called the
A. compressional stress
B. tensile stress
C. shear stress
D. any one of them
5 The cohesive forces between atoms, molecules or ions in crystalline solids maintain the strict
A. short range order
B. long range order
C. both of them
D. none of them
6 In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:
A. Adhesive force
B. Nuclear forces
C. Inter atomic cohesive force
D. Electromagnetic force
7 In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as
A. plastic limit
B. plastic deformation
C. proportional limit
D. elastic behaviour
8 The whole structure obtained by the repetition of unit cells is called:
A. Crystal lattice
B. Amorphous solid
C. Polymeric solid
D. Polysterne
9 Which of the following can become a good permanent magnet
A. iron
B. steel
C. both of them
D. none of them
10 Tick the one which is not polymer solid:
A. Zirconia
B. Polythene
C. Nylon
D. Synthetic rubber
11 Each atom in a metal crystal vibrates about a fixed point with an amplitude that:
A. Decrease the rise in temprature
B. Is not affected by rise in temprature
C. Increase with rise in temprature
D. Both (B) and (C)
12 The bands below the valence band are
A. completely filled and play active part in conduction process
B. completely filled and plays no part in conduction process
C. completely filled and play active part in conduction process
D. not completely filled and play no part in conduction process
13 The maximum stress that a material can withstand, is known as
A. plastic point
B. elastic limit
C. yield point
D. ultimate tensile strength
14 The transition from solid to liquid is actually from:
A. Order to disorder
B. Disorder to order
C. Order to order
D. Disorder to disorder
15 In a semi-conductor material, the total current is
A. only the +ve current
B. only the electronic current
C. sum of +ve and electronic current
D. all of them

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