131. | what metals are in brass |
A. iron and copper | |
B. zinc and iron | |
C. copper and zinc | |
D. nickel and zinc |
132. | Consider the following statements – 1. Baking soda is used in fire extinguishers. 2. Quick lime is used in the production of glass. 3. Gypsum is used in the production of plaster of paris. Which of the above statements is/are correct? |
A. 1 and 2 | |
B. 2 and 3 | |
C. only 1 | |
D. 1, 2 and 3 |
133. | Consider the following statements 1. Anhydrous sodium carbonate is commonly known as baking soda. 2. Baking soda is used in fire extinguishers. 3. Bleaching powder is produced at the Hessenclaver plant. Which of the above statements is/are correct? |
A. 1,2 and 3 | |
B. 2 and 3 | |
C. only 3 | |
D. 1 and 2 |
134. | The ‘slots’ used to connect electronic circuits contain |
A. lead and tin | |
B. tin and iron | |
C. copper and lead | |
D. lead and aluminum |
135. | Metals are good conductors because |
A. they have free electrons | |
B. their molecules stick together | |
C. their molecules collide freely | |
D. their page is reflective |
136. | Which of the following compounds is commonly used in mouthwashes and toothpastes? |
A. icing | |
B. saltpeter | |
C. hydrogen peroxide | |
D. Sodium chloride |
137. | Which of the following is liquid at room temperature |
A. lithium | |
B. sodium | |
C. francium | |
D. Cerium |
138. | Which alloy is used to make magnets |
A. duralumin | |
B. Stainless Steel | |
C. Elkino | |
D. magnalium |
139. | Which of the following is not a component of chlorophyll |
A. hydrogen | |
B. magnesium | |
C. Carbon | |
D. calcium |
140. | What gives glass its deep blue color? |
A. cobalt oxide | |
B. cupric oxide | |
C. ferrous oxide | |
D. nickel oxide |