141. A human body breathes in _ liters of air in a single day.
A) 1000 to 5000
B) 5000 to 10,000
C) 10,000 to 15,000
D) 15,000 to 20,000
142. An instrument designed for testing the purity of milk is called:
A) Anemometer
B) Manometer
C) Lactometer
D) Hydrometer
143. Which of the following methods is used to purify salty water?
A) Evaporation
B) Filtration
C) Distillation
D) None of these
144. Bronze is an alloy of:
A) Sulphur and Zinc
B) Copper and Tin
C) Copper and Sulphur
D) Platinum and Zinc
145. M shell can accommodate the number of electrons?
A) 2
B) 8
C) 18
D) 32
146. What is the empirical formula of Glucose?
A) H2CO3
B) CH
C) CH2O
D) HO
147. Mass number of an element is represented by?
A) A
B) Z
C) K
D) N
148. _ burns with a brick-red flame.
A) Potassium
B) Calcium
C) Sodium
D) Magnesium
149. The gas collected at the cathode is?
A) O3
B) Cl2
C) O2
D) H2
150. _ is a weak electrolyte.
A) Ca(OH)2
B) NaCl
C) NaOH
D) H2SO4
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