Description : Piping in a soil mass is a) Erosion of subsoil by the high velocities of flow of water through it when such velocities exceed a certain limit* b) Caused due to very low exit gradient c) ... connected pores d) Due to loss of the strength of cohesion less soil because of upward flow of of water
Last Answer : a) Erosion of subsoil by the high velocities of flow of water through it when such velocities exceed a certain limit*
Description : Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful (1) solar ultraviolet radiation (2) solar infrared radiation (3) CO2 in the air (4) SO2 in the air
Last Answer : (1) solar ultraviolet radiation Explanation: Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
Last Answer : solar ultraviolet radiation
Description : What compound is a common component of air pollution, but is essential in the upper atmosphere to protect life on earth?
Last Answer : ANSWER: OZONE
Description : The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids (A) Having high viscosities (B) Moving at low velocities (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : When the air the atmosphere is unevenly warmed by the sun's wind currents are the result?
Last Answer : energyenergy
Description : When the air in the atmosphere is unevenly warm by the suns wind currents are the results?
Last Answer : Essentially, yes: the Sun's heat createsconvection-currents.
Description : When the air in the air the atmosphere is unevenly warmed by the suns wind current?
Description : The earth’s atmosphere is divided into layers based on the vertical profile of -----? A. Air pressure B. Air temperature (Answer) C. Air density D. Wind speed
Last Answer : B. Air temperature (Answer)
Description : In upper layer of atmosphere ozone is formed by (1) the action of ultraviolet rays on oxygen (2) the combination of oxygen molecules (3) subjecting oxygen to high pressure (4) the action of nitrogen on oxygen in atmosphere
Last Answer : the action of ultraviolet rays on oxygen
Description : If two bodies one light and one heavy have equal kinetic energies, which one has a greater momentum? a.Momentum depends on velocities b.Heavy body c.Both have equal momentum d.Nothing can be concluded on the basis of information provided e.Light body
Last Answer : b. Heavy body
Description : Plastic collosion of two bodies of equal mass results in a common velocity after impact which is a.Sum of their initial velocities b.Difference of their initial velocities c.Average of their initial velocities d.Independent of their initial velocities e.None of the above
Last Answer : e. None of the above
Description : Which of the following statement is false? a.The potential energy of a particle has the form Ep = k2x. The force acting on the particle is constant (k is a constant) b.The linear velocity of ... zag path while ascending a steep hill e.The density of milk decreases when cream is taken out of milk
Last Answer : e. The density of milk decreases when cream is taken out of milk
Description : Two trains 120 m and 80 m in length are running in opposite directions with velocities 42 km/h and 30 km/h respectively.
Last Answer : Two trains 120 m and 80 m in length are running in opposite directions with velocities 42 km/h ... In what time will they completely cross each other?
Description : Is it possible to add two velocities using triangle law?
Last Answer : Is it possible to add two velocities using triangle law?
Description : Discuss the following as special cases of elastic collisions and obtain their exact or approximate final velocities
Last Answer : Discuss the following as special cases of elastic collisions and obtain their exact or approximate ... much massive object, initially at rest.
Description : A car and lorry are both moving with equal kinetic energy. If equal breaking force is applied on both, then before coming to rest the (a) Car will cover a greater distance (b) Lorry ... will cover the same distance (d) The distance covered by them will depend only on their respective velocities
Last Answer : Ans:(c)
Description : The sewer pipes A. Carry sewage as gravity conduits B. Are designed for generating self-cleansing velocities at different discharge C. Should resist the wear and tear caused due to abrasion D. All the above
Last Answer : ANS: D
Description : Two particles are called to be equal settling, if they are having the same. (A) Size (B) Specific gravity (C) Terminal velocities in the same fluid & in the same field of force (D) None of these
Last Answer : (C) Terminal velocities in the same fluid & in the same field of force
Description : Solid particles separation based on the difference in their flow velocities through fluids is termed as the (A) Clarification (B) Classification (C) Elutriation (D) Sedimentation
Last Answer : (B) Classification
Description : Sorting classifiers employing differential settling methods forseparation of particles make use of the differences in their (A) Particle sizes (B) Densities (C) Terminal velocities (D) None of these
Last Answer : (C) Terminal velocities
Description : In classification, particles are said to be equal settling, if they have the same terminal velocities in the (A) Different fluids (B) Same fluid (C) Same field of force (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : In distillation columns, the number of bubble caps per tray primarily depends upon the (A) Allowable liquid velocity (B) Allowable gas velocity (C) Allowable gas and liquid velocities
Last Answer : (C) Allowable gas and liquid velocities
Description : Clocks, which moves with the velocities comparable with the velocity of light, run ? A. fast B. slow C. equal to the velocity of light D. with zero velocity (Answer)
Last Answer : D. with zero velocity (Answer)
Description : Large diameter fibers propagate action potential at a. lower velocities b. higher velocities c. equal velocities d. none of them
Last Answer : higher velocities
Description : Momentum correction factor used in fluid flow problems accounts for the (A) Change in direction of flow (B) Change in total energy (C) Change in pressure (D) Non uniform direction of velocities at inlet & outlet sections
Last Answer : (D) Non uniform direction of velocities at inlet & outlet sections
Description : Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles ... (A) Drag on particles (B) Drag on column walls (C) Bed height (D) Bed voidage
Last Answer : (C) Bed height
Description : Laminar flow is characterised by the nonexistence of (A) Pressure fluctuation (B) Eddies (C) Deviating velocities (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Ore concentration by froth floatation utilises the __________ of oreparticles. (A) Density difference (B) Wetting characteristics (C) Terminal velocities (D) None of these
Last Answer : (B) Wetting characteristics
Description : Pick up the correct statement from the following: (A) Head loss in smaller size pipes at equal velocities, is less (B) Cost of pumping is less in smaller size pipes (C) Cost of smaller pipes is comparatively more (D) None of these
Last Answer : (D) None of these
Description : If the velocities of flow of a stream of 10 m depth recorded by a current meter at depths of 2 m and 8 m are 0.7 m and 0.3 m respectively, the discharge per unit width of the stream in cubic metres, is (A) 2 (B) 3 (C) 4 (D) 5
Last Answer : Answer: Option D
Description : The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as (A) One dimensional flow (B) Uniform flow (C) Steady flow (D) Turbulent flow
Description : The flow in a pipe or channel is said to be non-uniform when (A) The liquid particles at all sections have the same velocities (B) The liquid particles at different sections have different ... The quantity of liquid flowing per second is constant (D) Each liquid particle has a definite path
Last Answer : Answer: Option B
Description : The flow in a pipe or channel is said to be uniform when (A) The liquid particles at all sections have the same velocities (B) The liquid particles at different sections have different ... The quantity of liquid flowing per second is constant (D) Each liquid particle has a definite path
Last Answer : Answer: Option A
Description : Hot wire anemometer is used to measure (A) Pressure in gases (B) Liquid discharge (C) Pressure in liquids (D) Gas velocities
Description : According to the theory of relativity, people who travel at relativistic velocities and then return home will be: w) shorter than if they had not made the trip. x) taller than if they had not made the trip. y) younger than if they had not made the trip. z) older than if they had not made the trip.
Last Answer : ANSWER: Y -- YOUNGER THAN IF THEY HAD NOT MADE THE TRIP.
Description : The index of refraction can be considered: w) a ratio of material thickness between substances x) a ratio of velocities of light in different materials y) a ratio of mass between materials z) to have the units of photons
Last Answer : ANSWER: X -- A RATIO OF VELOCITIES OF LIGHT OF DIFFERENT MATERIALS
Description : In the mass spectrograph, two positively charged ions having the same velocity pass through a slit and enter a uniform magnetic field at right angles to their initial velocities. The ions will NOT be ... charges and their masses are equal z) the ratios of their charges to their masses are equal
Last Answer : ANSWER: Z -- THE RATIOS OF THEIR CHARGES TO THEIR MASSES ARE EQUAL
Description : Two cars collide head-on. They stop at the point of collision. Both cars must have one of the following. Do they have w) equal masses x) equal but opposite velocities before the collision y) equal but opposite momenta before the collision
Last Answer : ANSWER: Y -- EQUAL BUT OPPOSITE MOMENTA BEFORE THE COLLISION
Description : In an elastic collision, the RELATIVE velocities of separation of the two bodies after impact compared with the relative velocity of approach before impact is: w) always greater x) always smaller y) always the same z) first greater, then smaller
Last Answer : ANSWER: Y -- ALWAYS THE SAME
Description : Ozone layer of upper atmosphere is being destroyed by:
Last Answer : Ozone layer of upper atmosphere is being destroyed by: A. Chlorofluorocarbon B. `SO_(2)` C. photochemical oxidants/`O_(2)` and `CO_(2)` D. smog.
Description : The ozone hole in the upper atmosphere of the earth is due to the breakdown of ozone to oxygen. The reaction is catalyzed by
Last Answer : The ozone hole in the upper atmosphere of the earth is due to the breakdown of ... D. chlorine formed by the decomposition of chlorofluorocarbons
Description : `._(6)C^(14)` in upper atmosphere is generated by the nuclear reaction
Last Answer : `._(6)C^(14)` in upper atmosphere is generated by the nuclear reaction A. `._(7)^(14)N + ._(1)^(1)H to ._(6)^ ... )^(1)H to ._(6)^(11)C + ._(2)^(4)He`
Description : A considerable part of the harmful ultraviolet radiation of the sun does not reach the surface of earth. This is because in the upper atmosphere, ther
Last Answer : A considerable part of the harmful ultraviolet radiation of the sun does not reach the surface of earth. This is because ... ` C. `O_(3)` D. `NH_(3)`
Description : What would be an instrument to use to measure weather data from the upper atmosphere?
Last Answer : A weather satellite.
Description : Which of the following types radiations is absorbed by the upper layer of the atmosphere? A. Radio-waves B. Infrared C. Visible D. Ultraviolet
Last Answer : ANSWER: B
Description : The ultra violet radiations of the Sun do not reach the Earth because the upper layers of the atmosphere contain (a) oxygen (b) helium (c) ozone (d) hydrogen
Description : Which type of radiations are absorbed by the upper layer of the atmosphere? (1) Radio-waves (2) Infrared (3) Visible (4) Ultraviolet
Last Answer : (4) Ultraviolet Explanation: The Troposphere is the layer where the weather happens. Above this layer is the Stratosphere and in between them is the Ozone layer that absorbs the sun's ... . Above the Stratosphere is the Mesosphere, the Thermosphere including the Ionosphere - and the Exosphere.