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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
Consider the following statements in the relevant context: 1. The two types of currents that flow in semiconductor diodes and transistors are drift and diffusion currents. 2. The junction region is called depletion region or space-charge region. 3. When currents flow through the diode in forward bias, the depletion region current is mostly of ‘diffusion’ type. Which of the above statements are correct?
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
The critical reasoning question is based on a short argument, a set of statements, or a plan of action. For each question, select the best answer of the choices given. The size of particles is directly linked to their potential for causing health problems. Small particles less than 10 micrometers in diameter cause the greatest problems, as they can get deep into the lungs and some may get into the bloodstream. One being exposed to such particles can affect both the lungs and the heart of a person. But there are particles that are causing environmental effects too, few of which are given below.  Which among the following below options does not talk about the effects of these particles on the environment?
Consider the following statements: a. Beta particles are negatively charged and are more penetrating than Alpha particles, which are positively charged. b. Gamma particles are neutral and are more penetrating than Beta-particles. c. In general neutral particles can be said to be having very high penetrating power.
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:
Transport mechanisms that do not contribute to densification during sintering are:
P. Surface diffusion
Q. Bulk diffusion
R. Bulk diffusion
S. Evaporation-condensation
T. Viscous flow
The following properties of particles decide whether a given substance will exist as a solid, liquid, or gas: The spaces between the particles. The force of attraction between particles. The amount of movement of particles.
Which of the following statement about the force of attraction between the particles is/are correct? The force of attraction between the particles of the same substance is known as cohesion. The force of attraction is maximum in the particles of solid matter and minimum in the particles of gaseous matter.
A system of four particles is in X-Y plane of these two particles of masses m are located at (1, 1) and (-1, 1). The remaining two particles each of mass 2m are located at (1, 1) and (-1, -1). The xy component of moment of inertia tensor of the system of particles is