Option “3” is correct Silica gel is a granular, vitreous, porous form of silicon dioxide made synthetically from sodium silicate. It is mainly used as a drying agent.
372. Octane number is a measure of the quality of-
Option “2” is correct The Octane number of a fuel is the measure of its antiknock quality when it is used in a spark ignition, internal combustion engine as compared to the antiknock quality of ISO-octane. The higher octane number of a fuel means the better antiknocking capacity for that fuel.
373. Table salt (NaCl) is a product of-
1. Weak acid and weak base
2. Strong acid and strong base
3. Weak acid and strong base
4. Strong acid and weak basic
Option “2” is correct The compounds formed after reaction between the strong base and strong acid are known as neutral salt. Sodium chloride (NaCl) is an example of neutral which is salt also known as Table Salt.
374. ‘Red ink’ is prepared from-
1. Phenol
2. Aniline
3. Congo red
4. Eosin
Option “4” is correct Eosin is a Tetrabromofluorescein. Most red inks are dilute solution of the red dye eosin.
375. The Nucleus of Helium has-
1. Only one neutron
2. Two protons
3. Two protons and two neutrons
4. One proton and two neutrons
Option “3” is correct Helium- (2He4) is a non-radioactive isotope of the element Helium. Its nucleus is identical to an alpha particle and consists of two protons and two neutrons.
376. What does Trypsin do?
1. Breaks down Carbohydrates
2. Synthesizes proteins
3. Breaks down fats
4. Breaks down proteins
Option “4” is correct Trypsin is one of the three principal digestive proteinases. Trypsin acts with the other proteinases to break down dietary protein molecules to their component peptides and amino acids.
377. Name the source from which Aspirin is produced?
1. Willow bark
2. Oak Tree
3. Acacia
4. Eucalyptus
Option “1” is correct The ancient Egyptians used Willow bark to produce aspirin as a remedy for aches and pains.
Option “3” is correct The acid present in lemon is citric acid.
379. The Chemical formula of Urea is
1. (NH4)2CO2
2. (NH2)CO
3. (NH4)2CO
4. (NH2)2CO
Option “4” is correct Urea is an organic compound having chemical formula (NH2)2CO. Also called as Carbonic diamide. It is a colourless, odorless solid and highly soluble in water.
380. Atomic number of which of the following elements is greater than that of Magnesium
1. Neon
2. Fluorine
3. Sodium
4. Aluminum
Option “4” is correct Atomic number of Magnesium is 12. While Atomic number of Fluorine is 9, Neon is 10, Sodium is 11 and Aluminium is 13.
