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Consider the following statements regarding the importance of diffusion and choose the correct answer:
1. The exchange of gases takes place by the principle of dependent diffusion
2. The process of diffusion is involved in transpiration of water vapours
3. The ions are absorbed by the simple diffusion during passive salt uptake
4. Diffusion is an effective means of transport of substances over a very short distance and helps in the translocation of food materials
Which of the following are the properties of an electron? 1) Electron is a constituent of cathode ray 2) Electron is a negatively charged particle 3) The mass of the electron is equal to the mass of the proton 4) Electron is deflected by the electric field but not by magnetic field Select the correct answer using the code given below:
Match List 1 with List 2 and choose the correct answer form the code given below: List 1 (Cultural diffusion) List 2 (Definition) (a) Relocative  1.Upward/downward movement of dispersal through a system of classes or centres (b) Hierarchical Diffusion  2. When acceptance of or information about an innovation spreads throughout the society (c) Expansion Diffusion  3. When expansion affects almost uniformly to all individuals and areas from a source region (d) Contagious Diffusion  4. Geographical transfer of culture traits by movements of people across space
In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system. For equimolar counter current diffusion:
Find the velocity of an electron when its kinetic energy is equal to one electron volt (in 105m/s). Given charge of an electron e = 1.6 x 10-19 and mass of an electron m = 9.1 x 10-31.
"It is now expected that the variable production cost per unit and the selling price per unit will each increase by 10%, and fixed production cost will rise by 25%. What will be the new break even point?
Selling price - Rs 6 per unit
Variable production cost - Rs 1.20 per unit
Variable selling cost - Rs 0.40 per unit
Fixed production cost - Rs 4 per unit
Fixed selling cost - Rs 0.80 per unit
Budgeted production and sales for the year are 10,000 units."
Concentration of hydrogen gas across a 2mm thick palladium sheet differs by 4 kg/m3. Considering steady-state diffusion with diffusion constant 10-10 m2/s, diffusion flux is ______ kg/m2.s:
Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle     4. Diesel cycle     5. Brayton cycle
An electron starts from origin at t = 0. The velocity of the electron is 4Πm/s. It moves in an x-y plane under the action of a force that produces a constant acceleration of (4Î + 3ĵ) m/s2. What will be the x-coordinate of the electron when the y-coordinate is 13.5 m?
Which of the following example is correct about the diffusion? Example 1: The smell of food being cooked reaches us even from a considerable distance.  Example 2: The fragrance of the burning incense sticks spreads all around due to the diffusion of its smoke into the air. Example 3: The smell of perfume spreads due to the diffusion of perfume vapors into the air.