ECAT Pre Computer Science Chapter 17 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 17 Physics of Solids

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ECAT Physics Chapter 17 Physics of Solids

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Question # 1

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

Question # 2

The substances which break just after the elastic limit is reached, are known as

Question # 3

Within each domain, the magnetic field of all the spinning electrons are

Question # 4

The molecules or ions in a crystalline solids are

Question # 5

Polymeric solids have

Question # 6

Amorphous solids are also called as

Question # 7

The vast majority of solids are in the form of

Question # 8

In a semi-conductor material, current flows due to

Question # 9

In a semi-conductor material, the total current is

Question # 10

The charged nucleus of an atom itself spins its magnetic field

Question # 11

Polymers are the chemical combination of carbon with:

Question # 12

The maximum stress that a material can withstand, is known as

Question # 13

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

Question # 14

The solids are classified as:

Question # 15

The transition from solid to liquid is actually from:

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ECAT Physics Chapter 17 Important MCQ's

Sr.# Question Answer
1 When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called
A. p-type semi-conductor
B. n-type semi-conductor
C. either of them
D. none of them
2 Substances which break just after the elastic limit is reached, are known as
A. brittle substances
B. ductile substances
C. plastic substances
D. elastic substances
3 The first super conductor was discovered in
A. 1811
B. 1890
C. 1901
D. 1911
4 The conduction band in a solid
A. may be empty
B. cannot be empty
C. should be filed
D. all of them
5 The SI unit of stress is
A. N/m2
B. Nmc
C. dynes/m
D. N
6 An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:
A. 800oC
B. 500oC
C. 300oC
D. 100oC
7 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
8 The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:
A. Critical temparature
B. Temperature of vaporization
C. Melting point
D. Both (A) and (C)
9 The ratio of linear stress/linear strain is called as
A. Yong's modulus
B. Bulk modulus
C. Shear modulus
D. Modulus
10 The charged nucleus of an atom itself spins its magnetic field
A. equal to the field produced by orbital electrons
B. greater than the field produced by orbital electrons
C. much weaker than the field produced by orbital electrons
D. none of these

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