Give the name of the bacterium other than E. coli, which is used in recombinant DNA technology.

A body has a uniform velocity in frame of reference X.Is there any other frame of reference in which the body can be at rest?

Two chords PQ and RS of a circle are parallel to each other and AB is the perpendicular bisector of PQ. Without using any construction, prove that AB bisects RS.

Name a halogen other than chlorine, bromine and iodine.

If a line is perpendicular to one of two given parallel lines, then prove that it is also perpendicular to the other line.

Draw a circle and any two of its diameter.If you join the ends of thes diameters,what is the figure obtained?What figure is obtained if the diameters are perpendicular to each others?How do you check your answer?

Name two objects other than which are members of the solar system.

Every number other than I has atleast two distinct factors

State whether it is true or false: If two vector veca and vecb are perpendicular to each other then veca > vecb.

What is the effect of charged particle in magnetic field and electric field acting perpendicular to each other?