Question # 1

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

The first super conductor was discovered in

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1811

1890

1901

1911

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

The solids which has structure in-between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

A structure of polymeric solid is:

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An ordered structure

A disordered structure

Intermediate between order and disorder

Any of these

None of these

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

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5

7

9

14

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

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

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

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Physics ECAT Pre Engineering Chapter 17 Physics of Solid Online Test MCQs With Answers

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