1) Choose the correct answer:

1. One of types of glass tools used in preparation and distillation ………….

   1. round flasks

   2. b. burette

   3. c. pipette

   4. d. balance

2. Small volumes of liquids can be measured with ……………

   1. graduated cylinder

   2. b. tubes

c. graduated beaker

d. flasks

3. From the tools that measures pH value …………..

   1. paper tapes

   2. b. digital balance

c. PH meter

d. (a) and (c)

4. In the burette, zero is close to the ……………..

   1. upper opening

   2. b. middle

c. lower opening

d. value

5. From the one dimensional Nano scale ………….

   1. nano fibers

   2. b. nano tubes

c. nano shells

d. bucky ball

6. The nano meter = …………….. meter

   1. 1 x 10⁹

   2. b. 1 x 10

   3. c. 1 x 10^-3

   4. d. 1 x 10^-9

7. The nano scale is important in our life because it ………….

   1. requires certain tools to see it and deal with

b.appears new properties

1. 3. ranges from 1 : 100 n m

   4. needs certain methods to be produced

8. Which of the following value is larger?

   1. 10^-6

   2. b. 10^-9

   3. c. 10^-3

   4. d. 10^-2

9. On dividing a cube into smaller cubes, the surface area.

   1. decreases and the volume decreases

   2. increases and the volume decreases

   3. decreases and the volume remains fixed

   4. increases and the volume remains fixed

   5. 10. Nano meter is used to measure

1. 1. The diameter of an atom

   2. The diameter of water moleculeThe diameter of sand grain

   3. All the previous