By increasing impurity content in the metal alloy the residual resistivity always

A company owns some land and buildings for which the following details are relevant : Cost of land Taka 50,000; cost of building Taka 100,000, estimated life of building 20 years, estimated residual value of building Taka 2000; estimated residual value of land Taka 50,000. The company uses the straight line depreciation method. Which is the correct annual depreciation charge for this asset?

A

Taka 4000

B

Taka 4900

C

Taka 7400

D

Taka 7500

Increasing the original price of an item by 15 percent and then increasing the new price by another 15 percent is equivalent to increasing the original price by

A

32.25%

B

31.00%

C

30.25%

D

35.54%

Increasing the original price of an article by 15 percent and then increasing the new price by 15 percent is equivalent to increasing the original price by --

A

32.25%

B

31.00%

C

30.25%

D

30.00%

Increasing the original price of an article by 15 percent and then increasing the new price by 15 percent is equivalent to increasing the original price by ---

A

32.25%

B

31.00%

C

30.25%

D

30.00%

Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

A

Silicon

B

Sulphur

C

Manganese

D

Phosphorus

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.

A

Chromium

B

Nickel

C

Tungsten

D

Cobalt

The resistivity of a metal is a function of temperature because

A

The amplitude of vibration of the atoms varies with temperature

B

The electron density varies with temperature

C

The electron gas density varies with temperature

D

None of the above

Perminvar alloy having constant permeability is an alloy of

A

Nickel, copper and iron

B

Nickel, copper and zinc

C

Copper, nickel and antimony

D

Iron, zinc and bismuth

The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

A

Less than

B

Equal to

C

More than

D

Either B or C; depends on the type of alloy

Constantan an alloy used in thermocouples is an alloy of

A

Copper and tin

B

Copper and zinc

C

Copper and iron

D

Copper and nickel

By increasing impurity content in the metal alloy the residual resistivity always

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