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Current Affairs January 2024

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4

Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of

A. Paper

B. Cloth

C. Lead

D. Aluminium

Correct Answer :

C. Lead


Related Questions

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4

Pick out the correct statement about the condensation.

A. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation

B. Suitable coating or vapour additive is used to promote film wise condensation

C. If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it

D. Reynolds number of condensing liquid is based on its mass flow rate

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4

To counteract the bad effects of strain hardening on a cold formed part, it must be

A. Tempered

B. Normalised

C. Annealed

D. Hardened

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4

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

A. Wet bulb

B. Dry bulb

C. Saturation

D. Dew point

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4

Ultimate strength in tension as compared to that in shear for steel is

A. Half

B. One third

C. One and half times

D. One fourth

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4

Cassiterite is an ore of

A. Tin

B. Lead

C. Molybdenum

D. Chromium

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4

Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

A. Nitrogen oxides

B. Hydrocarbons

C. Both 'a' & 'b'

D. Carbon monoxide

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4

CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the

A. Specific fuel consumption is very low due to the use of heavy water

B. Fuel cost is much lower than that used in pressurised water or boiling water reactor

C. Heavy water is used both as coolant as well as moderator

D. Both 'b' & 'c'

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4

The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then

A. Wet bulb temperature=dry bulb temperature

B. Wet bulb temperature=dew point temperature

C. Saturation temperature=dew point temperature

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

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4

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

A. Decreases & increases

B. Increases & increases

C. Increases & decreases

D. Decreases & decreases

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4

Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.

A. Atoms

B. Neutrons

C. Nucleons

D. Electrons

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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

Batch process is preferred over continuous process, when the

A. Product yields and quality cannot be achieved in continuous process, because of long residence time

B. Sales demand of product is not steady

C. Same equipment cannot be used for several processes of the same nature

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

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4

Babbitt lining is used on brass/bronze bearings to increase the

A. Antifriction properties

B. Compressive strength

C. Bearing resistance

D. Wear resistance

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4

The main constituent of bones is

A. CaF2

B. Ca3(PO4)2

C. CaCO3

D. CaCl2

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4

Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.

A. Concentration

B. Velocity

C. Temperature

D. None of these

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4

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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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

The main charge in blast furnace is usually

A. Iron ore & coke

B. Iron ore, coke & air

C. Limestone, coke & iron ore

D. Limestone, sand & iron ore

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4

Pick out the wrong statement.

A. Seam welding, projection welding & spot welding are the classification of electrical resistance welding

B. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)

C. In spot welding, two pieces to be joined are overlapped and placed between two electrodes

D. Mild steel sheet cannot be spot welded

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4

Ammonia leakage in the refrigeration system is detected by

A. Sulphur stick, which on detection gives white smoke

B. Using chemical reagents

C. Its smell

D. Soap solution

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4

The delivery pressure of boiler feed water pump compared to the boiler steam pressure is

A. Same

B. Slightly less

C. Slightly more

D. Much more

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4

Triple point of water is

A. 0°F

B. 492°R

C. 0°K

D. -273°C

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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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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

Which one can be directly solidified from gaseous state without entering into liquid state?

A. Helium

B. Oxygen

C. Carbon dioxide

D. None of these

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4

An abrupt and sudden fall in the reading of barometer is an indication of the

A. Storm

B. Rain

C. Clear weather

D. Cold wave

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4

Which of the following equipments is used for liquid dispersion?

A. Packed column

B. Venturi scrubber

C. Bubble cap plate column

D. Wetted wall column

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4

Materials having resistivity ranging from 1 to 100 ohm. cm is termed as

A. Conductor

B. Insulator

C. Semi-conductor

D. None of these

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4

For preparation of porous bearings by powder metallurgy, preferred particle shape is

A. Spherical

B. Nodular

C. Irregular

D. No preferred shape

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4

In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be

A. ΔQ = 0, ΔS=0

B. ΔQ = 0, ΔS = +ve

C. ΔQ = 0, ΔS = -ve

D. ΔQ = +ve, ΔS= +ve