Diamagnetic materials

Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

A

CO₂

B

O₂

C

NO

D

NO₂

Diamagnetic Materials এর চৌম্বক প্রবশ্যতা বাতাসের তুলনায়-

A

কম

B

বেশি

C

সমান

D

কোনটিই নয়

Which of the following materials are diamagnetic?

A

Silver

B

Copper

C

Silver and copper

D

Iron

Diamagnetic materials are magnetised

A

Strongly

B

Only slightly

C

With eddy currents only

D

In a direction opposite to that of the applied field

Wood is a diamagnetic material.

A

True

B

False

Which of the following group of elements are diamagnetic?

A

Argon, copper, silver

B

Hydrogen, argon, copper

C

Oxygen, copper, silver

D

Hydrogen, oxygen, Argon

Thermoplastic materials are those materials which

A

Do not become hard with the application of heat and pressure and no chemical change occurs

B

Are flexible and can withstand considerable wear under suitable conditions

C

Are formed into shape under heat and pressure and results in a permanently hard product

D

Are used as a friction lining for clutches and brakes

In drilling softer materials, the cutting speed is ___________ as compared to harder materials.

A

Same

B

Low

C

High

D

None of these

Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. Such materials are called

A

Piezo-electric

B

Photo-electric

C

Thermo-electric

D

Photo-resistive

Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.

A

circular

B

triangular

C

rectangular

D

none of the above

Diamagnetic materials

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