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Percentage of argon (by volume) in dry atmospheric air is about

A. 0.09

B. 0.3

C. 0.57

D. 0.94

Correct Answer :

D. 0.94


Related Questions

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Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30%?

A. 9,100

B. 13,000

C. 7,000

D. 2,550

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Out of the following, which will fracture most readity, when hit with a hard hammer?

A. Brass

B. Bronze

C. German silver

D. Cast iron

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Fibrous fracture is normally encountered in the __________ materials.

A. Hard

B. Elastic

C. Ductile

D. Brittle

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Material of construction of foundry crucible is

A. Lead

B. Stainless steel

C. Graphite

D. Cast iron

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__________ test is the appropriate test to determine whether a material is ductile or brittle.

A. Impact

B. Cupping

C. Hardness

D. Tensile

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As the fluid flow rate increases, the float of the Rotameter

A. Rises in the tube

B. Rotates at higher speed

C. Rotates at lower speed

D. Drops down in the tube

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Which of the following is the correct nature of shear stress distribution along the cross section in a horizontal circular pipe under steady state fluid flow condition?

A.

B.

C.

D.

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The most commonly used moderator in nuclear power plants is

A. Graphite

B. Light water

C. Heavy water

D. Beryllium

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Materials having __________ lattice structure are usually the most ductile.

A. Body centred cubic (bcc)

B. Hexagonal close packed (hcp)

C. Face centred cubic (fcc)

D. None of these

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The co-ordination number in simple cubic structure is

A. 4

B. 6

C. 8

D. 12

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The best guide to judge the general quality of water is the measurement of its

A. pH value

B. Electrical conductivity

C. Turbidity

D. Dissolved oxygen content

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Unbreakable crockeries are made from __________ polymers.

A. Polystyrene

B. Melamine

C. Polystyrene

D. Polyurethane

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Multistage compression of air as compared to single stage compression offers the advantage of

A. Power saving per unit weight of air delivered

B. Moisture elimination in the inter-stage cooler

C. Increased volumetric efficiency

D. All (A), (B) & (C)

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__________ of hard alloy and tool steel is done to make it easily machinable.

A. Case carburising

B. Tempering

C. Normalising

D. Annealing

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__________ is used for tying the steel columns to concrete foundation.

A. Grouting

B. Eyebolt

C. Anchor bolts

D. Refractory castables

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__________ is not used as the control rod material in a nuclear reactor.

A. Cobalt

B. Hafnium

C. Cadmium

D. Boron

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Transformer cores are normally made from

A. Soft ferrites

B. High purity iron

C. Grain oriented Fe-Si alloy

D. Al-Ni-Co alloy

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In extrusion of metals, which of the following statement is true?

A. Speed of the extruded material is same as that of ram speed

B. Redundant work is a function of the die angle

C. Relative motion between the billet surface and the container wall is always present

D. Hollow ram is used for indirect extrusion

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4

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A. Grashoff number

B. Grashoff number & Reynolds number

C. Reynolds number

D. Grashoff number & Prandtl number

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A pycnometer is used for the measurement of

A. Flow rate of molten metal

B. Specific gravity of a liquid

C. Composition of alloys

D. Concentration of a solution

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During sensible heating of humid air

A. Relative humidity increases

B. Dew point remains constant

C. Dry bulb & wet bulb temperature increases

D. Both 'b' & 'c'

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4

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is

A. Very low which prevents their ignition by compression

B. Very high which prevents their ignition by compression

C. Zero

D. None of these

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4

Which of the following if present in iron ore, enhances its value?

A. Alumina

B. Alkali oxide

C. Lime & Magnesia

D. None of these

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The 'laughing gas' is

A. Nitrous oxide

B. Nitric oxide

C. Nitrogen trioxide

D. Nitrogen pentoxide

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The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.

A. Two

B. Four

C. Six

D. Eight

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__________ of air does not increase with increase in temperature.

A. Density

B. Thermal diffusivity

C. Viscosity

D. Thermal conductivity

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The swift cup test evaluates the following property of a sheet metal.

A. Stretchability

B. Drawability

C. Bendability

D. None of these

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Which of the following heat treatment processes is usually applied to castings?

A. Tempering

B. Annealing

C. Normalising

D. Carburising

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Which one of the following is incombustible?

A. H2

B. CCl4

C. C2H2

D. S

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Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.

A. Hexagonal close, packed (hcp)

B. Face centred cubic (fcc)

C. Body centred cubic (bcc)

D. Simple cubic