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__________ has the highest melting point out of the following.

A. Tungsten

B. Zirconium

C. Molybdenum

D. Tantalum

Correct Answer :

A. Tungsten


Related Questions

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X-rays are

A. Positively charged

B. Negatively charged

C. Neutral

D. Of higher wavelength than visible light

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4

Lead is poured into the joint between two __________ pipes.

A. Mild steel

B. Concrete

C. Cast iron

D. Asbestos cement

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4

Notched bar test is used for testing the __________ of a material.

A. Impact strength

B. Endurance limit

C. Machinability

D. Corrosion resistance

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4

Pick out the correct statement.

A. Hot worked materials are subjected to annealing to remove internal stresses

B. Annealing of steel hardens it slightly

C. Normalising of a material induces stresses

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness

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4

The condition of diffraction from a crystal is given by

A. nλ = 2d Sin θ

B. λ = d Sin 2θ

C. λ = 2d Sin 2θ

D. nλ = d Sin θ

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4

Lead pencil contains

A. Graphite

B. Lead sulphide

C. Lead

D. Both (B) & (C)

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4

Cold chisel & hammers are made of

A. High speed steel

B. High carbon steel

C. Forged steel

D. Mild steel

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4

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

A. Parabolic

B. Hyperbolic

C. Straight line

D. None of these

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4

Wavelength of radiation emitted by a body depends on the __________ of its surface.

A. Temperature

B. Area

C. Nature

D. All 'a', 'b' & 'c'

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4

One of the methods of purification of leach liquor is ion exchange, which involves

A. Exchange between two liquid phases

B. Exchange between a gaseous phase and a liquid phase

C. Exchange between a liquid phase and an organic resin phase

D. Exchange between a solid phase and a gas phase

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4

Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot

A. Piercing

B. Spinning

C. Drawing

D. Extrusion

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4

Boiling point of water gets lowered at high altitudes (e.g., hills), because

A. Temperature is low

B. Atmospheric pressure is low

C. Atmospheric pressure is high

D. None of these

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4

Minimum number of members required to form a Public Limited Joint Stock Com-pany is

A. 7

B. 10

C. 12

D. 17

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4

Which of the following has the highest value of refractive index?

A. Brine (sea water)

B. Diamond

C. Distilled water

D. Glass

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4

Cassiterite is an ore of

A. Tin

B. Lead

C. Molybdenum

D. Chromium

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4

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

A. Linearly

B. Exponentially

C. Logarithmically

D. Inversely

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4

Wrought iron is not

A. Ductile & resistant to corrosion/rusting

B. Weldable easily

C. Having uniform strength in all directions

D. Having maximum tensile strength along the lines of slag distribution

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4

Which of the following is used to produce draught in the locomotive boilers?

A. Chimney

B. Induced draught fan

C. Forced draught fan

D. Steam jet arrangement

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4

Which of the following is not used as a bearing material?

A. Copper-lead alloys

B. Babbitts

C. Bronzes

D. Cermets

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4

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

A. Scratch

B. Indentation

C. Dynamic

D. Rebound

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4

A psychrometer does not measure the __________ temperature of moist air.

A. Dew point

B. Dry bulb

C. Wet bulb

D. None of these

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4

Atomic __________ of an element is a whole number.

A. Weight

B. Number

C. Volume

D. Radius

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4

Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

A. Manganese

B. Phosphorous

C. Magnesium

D. Chromium

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4

Which of the following is an unconventional source of energy?

A. Thermal power

B. Hydroelectric power

C. Nuclear-fusion power

D. Solar power

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4

Cascade control is

A. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller

B. Used when changes in process conditions cause serious upsets in the controlled variable

C. Useful to control flow from temperature

D. All 'a', 'b' & 'c'

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4

Powder metallurgy technique is used in the production of __________ tools.

A. Tungsten carbide

B. High carbon steel

C. High speed steel

D. Drilling

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4

The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.

A. Fluidity

B. Basicity

C. Acidity

D. Viscosity

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4

Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of

A. 1 : 1

B. 1 : 2

C. 2 : 1

D. 1 : 4

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4

In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is

A. 1

B. 1.4

C. 1.5

D. Y = Cp/Cv

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4

Which of the following gases cause global warming?

A. Carbon monoxide

B. Carbon dioxide

C. Nitrogen

D. Ozone