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If u = tan^-1 (x+y), then x ∂u/∂x + y ∂u/∂y =

(1) sin 2u (2) ½ sin 2u (3) 2 tan u (4) sec2 u Solution: Given u = tan-1 (x+y)... View Article

(1) u (2) 2u (3) 3u (4) u/3 Solution: Given u = xy2 tan-1(y/x) Differentiate u partially w.r.t.x ux =... View Article

(1) (1 + log x)/(1 + log z) (2) -(1 + log x)/(1 + log z) (3) (1 + log... View Article

(1) 0 (2) 1 (3) 2 (4) 3 Solution: Given u = log(x3 + y3 + z3 – 3xyz) ∂u/∂x... View Article

(1) -y/(x2 + y2) (2) x/√(1 – y2) (3) -y/√(x2 – y2) (4) -y/x√(x2 – y2) Solution: Given u =... View Article

During nuclear fission, a small neutron hits a uranium atom and splits it into smaller atoms. During this process, a... View Article

Beryllium has 11 isotopes but only three are measured routinely 7Be, 9Be and 10Be. Beryllium is a monoisotopic element meaning... View Article

When the mass number of the atom is greater than 82, the atoms are not stable because of the level... View Article

It is very difficult to start a fusion reaction that releases more energy than what is required to start the... View Article

The binding energy is the energy equivalent of the mass defect. When the protons and neutrons are combined, the mass... View Article

NH4Br is a salt formed from a strong acid HBr and a weak acid NH3. Therefore the salt is acidic.

Hydrochloric acid is a stronger acid than sulphuric acid since the Ka value (acid ionisation constant) of hydrochloric acid is... View Article

Corrosive substances will destroy and damage the materials which they get in contact with. Few of the corrosive substances are... View Article

Nitric acid (HNO3) can be stored in dark coloured glass bottles. It is stored in dark bottles in order to... View Article

Nitrous acid (HNO2) decomposes into nitric oxide (NO), nitrogen dioxide (NO2) and water (H2O). 2HNO2→NO2+NO+H2O

Calcium is an alkaline earth metal. It is a pale yellow metal that is reactive and forms a dark oxide... View Article

Neon is a stable element since it has a full octet or completely filled valence shell with 8 electrons.

When the concentration of a salt solution is increased a. Boiling point increases while vapour pressure decreases b. Boiling point... View Article

Stefan-Boltzmann Law: According to this law, the total energy emitted per unit time by a hotter object is more than... View Article

Horizontally polarised signals oscillate from right to left and the vertically polarised signals oscillate up and down.