What is sewage? In which way can sewage be harmful to us?
Name any two species of fungus, which are used in the production of the antibiotics.
In which way have microbes played a major role in controlling diseases caused by harmful bacteria?
Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes
In which food would you find lactic acid bacteria? Mention some of their useful applications
Give examples to prove that microbes release gases during metabolism.
Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?
Name any five hybrid varieties of crop plants which have been developed in India.
Find out what the various components of the medium used for propagation of explants in vitro are?
What is the major advantage of producing plants by micropropagation?
Which part of the plant is best suited for making virus-free plants and why?
Explain what is meant by biofortification.
Briefly describe various steps involved in plant breeding.
Discuss the role of fishery in enhancement of food production.
What is apiculture? How is it important in our lives?
Name the methods employed in animal breeding. According to you which one of the methods is best? Why
Name the methods employed in animal breeding. According to you which one of the methods is best? Why
What is meant by the term ‘breed’? What are the objectives of animal breeding?
If your family owned a dairy farm, what measures would you undertake to improve the quality and quantity of milk production?
Please Explain in brief the role of animal husbandry in human welfare.
Fraction of total volume occupied by atoms in a simple cubic cell is
A solid is made of two elements P&Q. Atoms P are in ccp arrangement and atoms Q occupy all the octahedral voids and half of the tetrahedral voids, then the simplest formula of the compound is
In fluorite structure (CaF2)
In a fcc arrangement of A & B atoms, where A atoms are at the Corners of the unit cell, B atoms at the face centers, two atoms are missing from two corners in each unit cell, then the simplest formula of the compound is
An ionic compound AB has ZnS type of structure, if the radius A+ is 22.5pm, then the ideal radius of B- is
Close packing is maximum in the Crystal which is
The edge length of a cube is 400 pm. Its body diagonal would be
In closest packing of A type of atoms (radius, rA), the radius of atom B that can be fitted into Octahedral void is
The arrangement of Cl- ions in CsCl structure is
Xenon crystallizes in face centre cubic lattice and the edge of the unit cell is 620 pm, then the radius of xenon-atom is.
if the ratio of co-ordination no. P to that of Q be Y:Z, then the formula of the solid is
The limiting radius ratio of the complex
Compute the percentage void space per unit volume of unit cell in zinc-fluoride structure.
Prove that void space in fluorite structure per unit volume of unit cell is 0.251?
In a face centred lattice with all the positions occupied by A atoms the body centred octahedral hole in it is occupied by an atom B of an appropriate size for such a crystal, calculate the void space per unit volume of unit cell. Also predict the formula of the compound?
A tube of uniform cross sectional area 1 cm2 is closed at one end with semi permiable membrane. A solution having 5 gm glucose per 100 ml is placed inside the tube and dipped in pure water at 27°C. When the equilibrium is established, what will be the osmotic pressure, height developed in vertical column. Also calculate molality and molarity of the solution. Density of glucose solution is 1 gm/ml
NaCl is added to 1 litre water to such an extent that
becomes to the wt. of NaCl added is
The vapour pressure of solvent is 20 torr, while that of its dilute solution is 17 torr, the mole-fraction of the solvent is
Which of the following plots represents the behaviour of an ideal binary liquid solution?
The vapour pressures of ethanol and methanol are 42.0 mm and 88.5 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 46.0 g of ethanol with 16.0 g of methanol. The mole fraction of methanol in the vapour is:
The vapour pressure of benzene at 80°C is lowered by 10 mm by dissolving 2g of a non-volatile substance in 78g of benzene. The vapour pressure of pure benzene at 80°C is 750 mm. The molecular weight of the substance will be:
Solute A is a ternary electrolyte and solute B is non-electrolyte. If 0.1 M solution of solute B produces an osmotic pressure of 2P, then 0.05 M solution of A at the same temperature will produce on osmotic pressure equal to
A solution containing 8.6 g urea in one litre was found to be isotonic with a 5% (wt./vol.) solution of an organic non-volatile solute. The molecular weight of latter is:
Dry air was passed successively through a solution of 5 g of a solute in 180 g of water and then through pure water. The loss in weight of solution was 2.50 g and that of pure solvent 0.04 g. The molecular weight of the solute is:
Osmotic pressure of blood is 7.65 atm at 310 K. An aqueous solution of glucose that will be isotonic with blood is ----------- wt./vol.
One mole of non-volatile solute is dissolved in two moles of water. The vapour pressure of the solution relative to that of water is
A 0.1097 gm sample of As2O3 required 26.10 mL of KMnO4 solution for its titration. The molarity of KMnO4 solution is
The volume of 0.25 M H3PO3 required to neutralise 25 ml of 0.03 M Ca(OH)2 is
1.5 litre of a solution of normality N and 2.5 litre of 2M HCl are mixed together. The resultant solution had a normality 5. The value of N is
20g of sample of Ba(OH)2 is dissolved in 50 mL of 0.1 N HCl solution. The excess of HCl was titrated with 0.1 N NaOH. The volume of NaOH used was 20 ml. The percentage of Ba(OH)2 in the sample is
A metal oxide has the formula Z2O3. It can be reduced by hydrogen to give free metal and water. 0.1596g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is