For insulators and semiconductors the resistance decreases with increase in temperature because

Monochromatic light of wavelength 600 nm is incident from air on to water surface. The frequency of refracted light is

The desirable properties of materials for making permanent magnets are:

Which of the following is necessary to use to achieve half wave rectification of an alternating current?

A beam of electrons move horizontally from South to North in the region of the magnetic field acting vertically downward. The force acting on the electron due to the magnetic field is :

Which of the following statements is correct about the effect of the presence of a third charge on Coulomb force between the two charges?

If Brewster's angle be θ, then the critical angle is:

The number of square matrices of order 2 using numbers 1 and -1 exactly once and the number 0 twice is :

The figure is showing the technique of gel electrophoresis. The matrix used in this technique is made out of:

The complex having lowest \(\Delta_0\) value among the given complexes is :

Read the following passage carefully and answer the given questions.
During anaerobic sludge digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as source of energy as it is inflammable. The bioactive molecule, cyclosporin A, that is used as an immunosuppressive agent in organ-transplant patients, is produced by the fungus Trichoderma polysporum. You must have noticed that bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of pectinases and proteases. Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol. The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water.
Statins, used as blood-cholesterol lowering agents are produced by -

Match List - I with List - II.

LIST I (Molecule)	LIST II (Function)
A. DNA ligase	I. snRNAs
B. RNA polymerase II	II. Discontinuous RNA synthesis
C. RNA polymerase III	III. 28S rRNA
D. RNA polymerase I	IV. hn RNA

Choose the correct answer from the options given below:

Once the BOD of sewage or waste water is reduced significantly, the effluent is then passed into a settling tank where the bacterial 'flocs' are allowed to sediment. This sediment is called as: