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4

The following type of bonding is strongly directional in solids.

A. Vander Waal's

B. Ionic

C. Metallic

D. Covalent

Correct Answer :

D. Covalent


Related Questions

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4

The starting of a car takes time in winter, because the

A. Octane number of fuel is decreased

B. Fuel supply for ignition is not sufficient

C. Vaporisation of the fuel is decreased

D. Pour point of fuel decreases

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4

Shampoos are commercially not available in the form of

A. Powder

B. Gaseous mixture

C. Solution

D. Emulsion

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4

The process of removal of scale formed during hot rolling of steel is termed as

A. Descaling

B. Shot blasting

C. Pickling

D. Skimming

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4

Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?

A. Vapour locking

B. Hot starting

C. Spark plug fouling

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

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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

A jig is used while __________ a hole.

A. Boring

B. Counter boring

C. Drilling

D. Enlarging

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4

The type of pump used for lifting large quantity of sewage is a __________ pump.

A. Gear

B. Centrifugal

C. Reciprocating

D. Plunger

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4

Difference at any instant between the value of the controlled variable and the set point is called the

A. Deviation

B. Derivative time

C. Error ratio

D. Differential gap

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4

In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

A. Percentage elongation

B. Brinell hardness

C. Tensile strength

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

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4

The two elements required to form substitutional solid solution should not have

A. Same crystalline structure

B. Same valency

C. Widely differing electronegativity

D. Same atomic sizes

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4

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

A. Enthalpy

B. Relative humidity

C. Wet bulb temperature

D. Dew point temperature

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4

The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.

A. Runner

B. Cylinder

C. Mold

D. None of these

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4

The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their

A. Equivalent weight

B. (Equivalent weight)2

C. Molecular weight

D. (Molecular weight)2

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4

Dew point temperature always gives an indication of the __________ of the moist air.

A. Dryness

B. Moisture content

C. Coolness

D. Latent heat

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4

Basic open hearth furnace (BOF) is not used for producing __________ steel.

A. Killed

B. Rimming

C. High alloy

D. None of these

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4

Water-tube boiler is the one, in which

A. Water passes through tubes and flue gases around it

B. Tube carrying hot flue gases are immersed in a pool of water

C. Tubes are placed in vertical position

D. None of these

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4

Rankine cycle comprises of two isothermal and two __________ processes.

A. Isobaric

B. Polytropic

C. Isentropic

D. None of these

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4

Case hardening of a material is

A. Followed by tempering or carburising

B. Preceded by its tempering

C. Done to get a soft ductile interior with a very hard surface

D. Carried out to get extreme hardness in its core

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4

The product out from a cupola is called

A. Wrought iron

B. Pig iron

C. Cast iron

D. None of these

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4

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.

A. 6

B. 18

C. 38

D. 52

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4

Atomic __________ is a whole number for an element.

A. Number

B. Weight

C. Radius

D. None of these

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4

Case hardening is not done by

A. Nitriding

B. Hot dipping

C. Electroplating

D. Both b & c

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4

Globular form of cementite is formed during the __________ process.

A. Spheroidising

B. Hardening

C. Annealing

D. Normalising

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4

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

A. Tensile strength

B. Compressive strength

C. Young's modulus

D. Thermal co-efficient of expansion

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4

Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore?

A. High fusibility & fluidity

B. High thermal conductivity

C. Low density

D. High chemical activity

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4

For separating small pieces of metal from engine oil of a car, the best separating technique is the

A. Chromatography

B. Evaporation

C. Filtration

D. Fractional distillation

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4

The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.

A. 0

B. 100

C. 50

D. None of these

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4

Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.

A. 80-120

B. 200-300

C. 600-800

D. 1000-1100

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4

Leakage in a cooking gas cylinder is detected by

A. Radio-isotopes

B. Pouring soap solution on the surface and locating the gas bubbles

C. Halide torch

D. Pungent smell of mercaptans present in the gas

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4

Which of the following is the largest quantum of pressure?

A. 1 kg/cm2

B. 1 bar

C. 1 atmosphere

D. 1 kilo Pascal