11) What is the chemical name of baking soda?
(A) Sodium bicarbonate
(B) Sodium Nitrate
(C) Sodium Carbonate
(D) Potassium
12) Milk lacks in one important nutrient, which?
(A) Calcium
(B) Iron
(C) Potassium
(D) Protein
13) Ripening of fruits is hastened by which of the following gases
(A) Hydrogen
(B) Carbon dioxide
(C) Methane
(D) Ethylene
14) Iron articles rust because of the formation of
(A) Ferrous chloride
(B) A mixture of ferrous and ferric hydroxide
(C) Sodium carbonate
(D) Ferric chloride
15) Gunpowder consists of
(A) 75% potassium nitrite + 15% charcoal + 10% sulphur
(B) 75% potassium nitrite + 10% charcoal + 15% sulphur
(C) 75% potassium nitrate + 10% charcoal + 15% sulphur
(D) 75% potassium nitrate 15% charcoal + 10% sulphur
16) X-rays are produced when a stream of electrons in an X-ray tube
(A) Hits the glass wall of the tube
(B) Strikes metal target
(C) Pass through a strong magnetic field
(D) None
17) In the periodic table elements have been arranged
(A) In order of increasing volume
(B) In order of increasing atomic number
(C) In order of increasing atomic weights
(D) In order of increasing density
18) Which group of elements in the periodic table show highest first ionization potential. Elements in the
(A) Left hand top corner
(B) Left hand bottom corner
(C) Right hand top corner
(D) Right hand bottom corner
19) When we move from left to right in second period, the atomic volume of the element
(A) Increases
(B) Increases with constant state
(C) Decreases
(D) None of these
20) Generally in a given period in the periodic table, as we move from left to right, the electropositive character of elements
(A) Increases
(B) Decreases
(C) Neither increases nor decreases
(D) Decreases then increases