1 & 3 Marks Question from Surface Chemistry

A question bank has questions of Physics and Chemistry. The number of questions of Chemistry are 3.5 times the number of questions of Physics. If there are 90 questions in the question , bank find the number of questions of Physics and Chemistry in the question bank .

Witting reagent is used for the synthesis of alkenes from ketone in organic chemistry. The Witting reagent is.

A point object is kept at a distance of 2 m from a parabolic reflecting surface y^(2) = 2x . An equiconvex lens is kept at a distance of 1.80 m from the parabolic surface. The focal length of the lens is 20 cm . Find the position from origin of the image in cm, after reflection from the surface.

If light of wavelength of maximum intensity emitted from surface at temperature T_(1) Is used to cause photoelectric emission from a metallic surface, the maximum kinetic energy of the emitted electron is 6 ev, which is 3 time the work function of the metallic surface. If light of wavelength of maximum intensity emitted from a surface at temperature T_(2) (T_(2)=2T_(1)) is used, the maximum kinetic energy of the photo electrons emitted is

In reference to surface chemistry, define dialysis.

A student got the following marks in 9 questions of a question paper. 3,5,7,3,8,0,1,4 and 6. Find the median of these marks.

In the above example, if temperature of inner surface P is kept constant at theta_1 and of the outer surface Q at theta_2(lttheta_1) . Then, Find. (a) rate of heat flow or heat current from inner surface to outer surface. (b) temperature theta at a distance r (altrltb) from centre.

A stone drop from height h reaches to earth surface in 1 sec. if the same stone taken to moon and drop freely then it will reaches from the surface of the moon in the time (the 'g' of moon is 1/6 times of earth)-

A hollow sphere of glass of inner and outer radii R and 2R respectively has a small mark on its inner surface. This mark is observed from a point outside the sphere such that the centre of the sphere lies in between. Prove that the mark will appear nearer than it really it, by a distance (mu-1)(R)//(3mu-1)

A test contains 10 true/false questions. A correct answer is awarded 2 marks, a wrong answer -1 and a question not answered is awarded 0. A student attempts 7 questions and gets 8 marks. How many questions did the student answer correctly?