All questions
- Which of the following is put into Anaerobic sludge digester for further sewage treatment ? b) Activated sludge Explaination:: Major portion of activated sludge is pumped into large tanks called anaerobic sludge digesters. So, here... 1
- Ray florets have : a) Hypogynous ovary b) Half inferior ovary c) Inferior ovary d) Superior ovary c) Inferior ovary Explaination:: Ray florets have inferior ovary and the reason is that the other parts of the flower are attached above the... 1
- Identify the correct statement with reference to human digestive system. a) Ileum is a highly coiled part a) Ileum is a highly coiled part Explaination: a) Small intestine is distinguishable into three regions, a ‘U’ shaped duodenum, a long coile... 1
- The enzyme enterokinase helps in conversion of : a) Caseinogen into casein d) Trypsinogen into trypsin Explaination:: Trypsinogen is present in inactive form in pancreatic juice. So enterokinase enzyme converts inac... 1
- The QRS complex in a standard ECG represents : a) Depolarisation of ventricles a) Depolarisation of ventricles Explaination:: The QRS complex represents the depolarisation of the ventricles, which initiates the ventricu... 1
- The sequence that controls the copy number of the linked DNA in the vector, is termed a) d) Ori site Explaination:: Origin of replication (ori): This is a sequence from where replication starts and any piece of DNA when linked to... 1
- Match the following columns and select the correct option Column I Column II (a) Placenta (i) Androgens (b) Zona pellucida (ii) Human Chorionic 3}(a)→(ii),(b)→(iii),(c)→(iv),(d)→(i) Explaination:: (a) Placenta also acts as an endocrine tissue and produces several hormones like human... 1
- Presence of which of the following conditions in urine are indicative of Diabetes Mellitus ? a) Ketonuria and Glycosuria b) Renal calculi and Hyperglycaemia a) Ketonuria and Glycosuria Explaination:: Diabetes mellitus leads to a complex disorder called prolonged hyperglycemia, which is associated... 1
- Find out the s block elements compounds importance/uses. Important compounds of s-block elements and their uses CompoundUses Sodium chloride, NaCl (common salt)Food seasoning and preservation; raw... 1
- 5. Choose the correct option. A. The unstable isotope of hydrogen is ..... a. H-1 b. H-2 c. H-3 d. H-4 1) The unstable isotope of hydrogen is ….. a. H-1 b. H-2 c. H-3 d. H-4 Answer: c. H-3 2)Identify the odd one. a. Rb b. Ra c. Sr d. Be Answer... 1
- Name the following A. Alkali metal with smallest atom. 1)Alkali metal with smallest atom. Answer: Lithium (Li) 2) The most abundant element in the universe. Answer: Hydrogen (H) 3)Radioactive alk... 1
- Name the isotopes of hydrogen. Write their atomic composition schematically and explain which of these is radioactive ? Hydrogen has three isotopes i.e., hydrogen ( ₁¹ H) , deuterium ( ₁² H) and tritium ( ₁³ H) with mass numbers 1, 2 and 3 respectively. They a... 1
- A water sample, which did not give lather with soap, was found to contain Ca(HCO3 )2 and Mg(HCO3 )2 . Answer: Washing soda ( Na₂CO₃ ) or slaked lime ( Ca(OH)₂ , Clark's method) will make this water give lather. Water containing Ca(HCO₃)₂ and... 1
- Describe the industrial production of dihydrogen from steam. Also write the chemical reaction involved. Answer: Dihydrogen is made industrially by passing steam over hydrocarbons or red-hot coke at high temperature, followed by the water-gas sh... 1
- Describe the diagonal relationship between Li and Mg with the help of two illustrative properties. Answer: Lithium (group 1, period 2) resembles magnesium (group 2, period 3), its diagonal neighbour, because Li⁺ and Mg²⁺ have similar sizes... 1
- Beryllium oxide is treated separately with aqueous HCl and aqueous NaOH solutions. Answer: BeO is amphoteric, so it dissolves in both HCl and NaOH. With aqueous HCl it acts as a base and forms beryllium chloride and water:... 1
- Magnesium is heated in air. Answer: Magnesium burns with a dazzling white light to form magnesium oxide, along with some magnesium nitride. Air is mainly oxygen and nit... 1
- A 50% solution of sulphuric acid is subjected to electrolyte oxidation and the product is hydrolysed See below image 2
- CO2 is passed into concentrated solution of NaCl, which is saturated with NH3 . ceunderset(Ammonia)2NH3_((aq))+H2O_((l)) + CO2_((g))->undersetAmmonium carbonate(NH4)2CO3_((aq)) ceundersetAmmonium carbonate(NH4)2CO3_((aq)... 1
- Lithium floats an water while sodium floats and catches fire when put in water. When lithium and sodium react with water, hydrogen gas is released. Due to these hydrogen gas bubbles, lithium and sodium floats on water. e... 2
- BeCl2 is covalent while MgCl2 is ionic. Be²⁺ ion has very small ionic size and therefore, it has very high charge density. Due to this, it has high tendency to distort the electron... 1
- Sodium dissolves in liquid ammonia to form a solution which shows electrical conductivity Sodium dissolves in liquid ammonia giving deep blue coloured solutions which is electrically conducting in nature. Na + (x + y) NH₃ → [Na(NH... 1
- Alkaline earth metals have low values of electronegativity; which decrease down the group Electronegativity represents attractive force exerted by the nucleus on shared electrons.The general outer electronic configuration of alkal... 2
- Standard reduction potential of alkali metals have high negative values. The general outer electronic configuration of alkali metals is ns¹. They readily lose one valence shell electron to achieve stable noble gas... 1