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Current Affairs January 2024

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4

Energy of the sun arises mainly from __________ reactions.

A. Fusion

B. Fission

C. Combustion

D. None of these

Correct Answer :

A. Fusion


Related Questions

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Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

A. 1/k

B. k

C. k2

D. 1/k2

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4

Moist climate is the most favourable factor in the site selection far a

A. Steel plant

B. Textile factory

C. Petroleum refinery

D. Coke oven battery

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For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot?

A. Temperature - entropy

B. Temperature - pressure

C. Enthalpy - entropy

D. Enthalpy-pressure

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4

In TIG welding, thoriated tungsten electrodes are used, because it

A. Has higher current carrying capacity

B. Has better electron emissivity

C. Is stronger than ordinary tungsten

D. Is easy to prepare

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Which of the following is an example of cathodic protection of metals against corrosion?

A. Painted steel

B. Galvanised iron

C. Case hardened steel

D. Lead lined reactor

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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

X-rays are

A. Positively charged

B. Negatively charged

C. Neutral

D. Of higher wavelength than visible light

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A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?

A. Steel

B. Glass

C. Rubber

D. Brass

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4

Pick out the wrong statement.

A. Molecules with symmetrical arrangements (e.g. CH4 or CCl4) are non-polar

B. Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise

C. Most of the hydrocarbons are non-polar

D. None of these

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__________ is the hardest material out of the following.

A. Boron carbide

B. Tungsten carbide

C. Hardened steel

D. Silicon carbide

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__________ temperature remains constant during adiabatic saturation process of unsaturated air.

A. Dew point

B. Dry bulb

C. Wet bulb

D. None of these

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The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.

A. Ambient

B. Dry bulb

C. Dew point

D. Wet bulb

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4

Holes for riveting purposes should be preferably made by

A. Cutting torch

B. Drilling

C. Punching

D. None of these

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The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

A. Carbon

B. Manganese

C. Both 'a' nor 'b'

D. Neither 'a' nor 'b'

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4

The most commonly used moderator in nuclear power plants is

A. Graphite

B. Light water

C. Heavy water

D. Beryllium

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Diamagnetic materials

A. Are magnetised by eddy currents only

B. Are non-magnetic and cannot be magnetised

C. Are magnetised in direction opposite to the magnetic field

D. Can be magnetised in one direction only

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4

For the Stoke's law to be valid in the case of a falling sphere in a fluid, the

A. Reynolds number (based on sphere diameter) should be < 1

B. Flow around the sphere should be in turbulent region

C. Sphere must be metallic

D. Fluid density should be constant

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Maraging steels derive their strength from the following mechanism:

A. A fine, highly dislocated and strong martensite

B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc

C. Fine dispersions of alloy carbides in a ferrite matrix

D. Fine dispersions of C nucleated on dislocations in austenite

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Between 230 and 370°C, blue brittleness is caused in mild steel because of the

A. Immobility of dislocation

B. Strain-ageing

C. Increase in Young's modulus

D. Strain hardening

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4

The elastic strain in copper is due to the

A. Motion of dislocations

B. Stretching of atomic bonds

C. Breakage of atomic bonds

D. None of the above

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4

The thermodynamic law, = constant, is not followed by the

A. Free expansion of an ideal gas

B. Adiabatic expansion of steam in turbine

C. Adiabatic compression of air

D. Ideal compression of air

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4

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)

A. H

B. H/2

C. H/4

D. H/6

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The pressure outside a bubble/droplet of liquid is __________ the internal pressure.

A. Greater than

B. Less than

C. Equal to

D. Unpredictable; depends on the bubble size

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Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is

A. Nickel

B. Cobalt

C. Vanadium

D. Platinum

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4

The activity co-efficient of the solute in a dilute solution

A. Decreases with the increase of concentration of the solute

B. Increases with the increase of concentration of the solute

C. Remains constant

D. Is unity at infinite dilution

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L.D. (Linz-Donawitz) converter is used in the production of

A. Copper

B. Steel

C. Zinc

D. Aluminium

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The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.

A. 768

B. 908

C. 1400

D. 1539

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Gratings is associated with the measurement of

A. Linear displacement

B. Concavity/convexity

C. Surface texture

D. Flatness

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Silicon percentage in silicon steel used for electrical equipments is about

A. 1

B. 4.0

C. 8

D. 14

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Load cells used for the measurement of weight has

A. Compact & rugged construction with an accuracy of 0.1 to 1%

B. No moving parts and incurs negligible deflection under load

C. Provision of thermal compensation and is hermetically sealed

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