Sudden fall of atmospheric pressure by a large amount is an indication of the
Rain
Cold wave
Storm
Fair weather
Correct Answer :
C. Storm
Related Questions
An atom bomb works on the principle of
Nuclear fission
Nuclear fusion
Both the nuclear fission & fusion
Ionisation
In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, 
= velocity gradient).
For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by
A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
The better insulation material should be put just next to pipe (i.e., inside)
The better insulating material should be put outside
Either of the insulating material could be put on either side
Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
The lightest non-inflammable gas is
H2
He
Ar
O2
Milk is fat dispersed in water. It is an example of
Suspension
Emulsion
Gel
Solution
Which of the following is not a ferromagnetic material?
Nickel
Cobalt
Aluminium
Iron
Pick out the wrong statement.
Complete unity of command exists in a line organisation
Line organisation is net suitable for expansion and growth of an industry
In line and staff organisation, line executes and staff directs
None of these
Auto collimator is used to check
Flatness
Angle
Rotor balancing
Roughness
Nusselt number/Biot number varies
Inversely with thermal conductivity
Directly with heat transfer co-efficient
Directly with thermal conductivity
Inversely with the dimension of the solid
__________ rubber is generally used for making 'O' rings used for vacuum sealings.
Natural
Neoprene
Butadiene
Nitrile
__________ can replace tungsten in high speed steel.
Chromium
Vanadium
Cobalt
Molybdenum
In electrical resistance welding, distortion results from the use of improper
Clamping methods
Electrodes
Current
Filler material
Wrought iron does not have
Uniform strength in all directions
Ability to hold protective coating
High ductility & corrosion resistance
Easily weldable characteristics
As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.
Butt
Lap
Welded
None of these
A reduction in thermal resistance during heat transfer does not occur in the
Convection heat transfer by stirring the fluid and cleaning the heating surface
Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
Radiation heat transfer by increasing the temperature and reducing the emissivity
None of these
The best guide to judge the general quality of water is the measurement of its
pH value
Electrical conductivity
Turbidity
Dissolved oxygen content
Oxide layer formed on the non-ferrous metal surface after its annealing is
Removed by acid pickling
Hammered into the surface
Removed with coarse emery cloth
Left as such to protect the surface
Broaching tools are usually made of
Cermets
High speed steel
Tungsten carbide
Stellite
Addition of __________ to steel does not impart hardness.
Nickel
Copper
Chromium
Silicon
Laser is a device to produce
Gamma rays
Microwaves
A beam of white light
A beam of coherent light
Eutectoid composition of carbon steel at room temperature is
Cementite
Pearlite
Martensite
Ferrite
__________ property of steel increases by addition of large amount of silicon in it.
Mechanical
Machining
Magnetic
Refractory
The hardenability of steel decreases with
Decrease in dislocation density
Increase in solutionising temperature
Increase in strength
Decrease in grain size
The most important requirement for aluminium industry is the availability of cheap
Ore
Electrical power
Labour
Abundant water
The underground well of a biogas plant is called the
Septic tank
Oxidation well
Digestor
Lagoon
Shaft/rotor speed is most accurately measured by a
Frequency counter
Tachometer
Strobometer
Speedometer
The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
5
15
30
45
Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
X-rays
γ-rays
α-rays
β-rays
Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is
3
5
0.5
1.5