The correct statement regarding entropy is, 

(1) At absolute zero temperature, the entropy of a perfectly crystalline substance is +ve 

(2) At 0°C, the entropy of a perfect crystalline solid is zero 

(3) At absolute zero temperature, entropy of a perfectly crystalline solid is zero 

(4) At absolute zero temperature, the entropy of all crystalline substances is zero

Digestion of proteins is incomplete in the absence of enterokinase, because 

(1) Trypsinogen is not converted into trypsin 

(2) Pepsinogen is not converted into pepsin 

(3) Prorennin is not converted into rennin 

(4) Chymotrypsinogen is not converted into chymotrypsin

Some desert beetles can survive on “metabolic water”, without ever drinking liquid water which 

(1) is a breakdown product of pyruvate inside the mitochondria, along with carbon dioxide 

(2) was produced as water in the organisms they eat 

(3) is a breakdown product from glycolysis in the cytoplasm 

(4) is absorbed from the air along with respiratory oxygen

A plane glass plate is placed over a various coloured letters (violet, green, yellow, red). The letter which appears to raised more 

(1) Yellow 

(2) Violet 

(3) Red 

(4) Green

Pick the hormone which is not secreted by human placenta. 

(1) Prolactin 

(2) hCG 

(3) Estrogen

(4) hPL

HCl gas is covalent and NaCl is an ionic compound. This is because 

(1) Hydrogen is a non-metal 

(2) Electronegativity difference between H and Cl is less than 2.1 

(3) Sodium is highly electro positive 

(4) HCl is a gas

The increasing order of bond order of O_2,O⁺_2,O₂^{– –} is

(1) O₂,^{– –} O^–_2, O⁺_2, O₂

(2) O^2-_2, O^–₂, O_2, O⁺₂

(3) O⁺₂, O₂, O^–₂, O₂^{– –}

(4) O_2, O⁺_2, O^–_2, O₂^{– –}

Which is true regarding nitrogen? 

(1) Has low ionisation enthalpy 

(2) Ability to form pπ -pπ bonds with itself 

(3) Less electronegative 

(4) d-orbitals are available

The property which is not true about Fluorine is, 

(1) It forms only one oxo acid 

(2) High F-F bond dissociation enthalpy 

(3) Most of its reactions are exothermic 

(4) Highest electronegativity 

The value of tan π/8 is equal to 

(1) √2 + 1

(2) 1-√2

(3) 1/2

(4) 1/√2+1