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TERMINOLOGIES > cluster 1 set a > Flashcards

cluster 1 set a Flashcards

1
Q

The following will cause drift errors in an analytical balance except:

a. Balance door is open.
b. Balance is not levelled.
c. Air currents are present in the laboratory.
d. Temperature of the balance and the sample to be weighed is the same.

A

Balance door is open.

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2
Q

It is a document that provides useful information on the chemical hazards, advice on safe
handling, use and storage, and the emergency measures to be followed in case of an accident. It usually contains 16 headings.

a. Certificate of Analysis
b. Product Specification
c. Safety Data Sheet
d. Environmental Compliance Certificate

A

Safety data sheets

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3
Q

Type of chemical that can cause an allergic reaction in the airways following inhalation of the chemical.

a. Oxidizer
b. Corrosive
c. Carcinogen
d. Respiratory Sensitizer

A

Respiratory Sensitizer

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4
Q

Ammonia solution can be stored with the following chemicals except for:

a. acetic acid solution
b. sodium hydroxide solution
c. 2-propanol solution
d. cyclohexane solution

A

acetic acid solution

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5
Q

First consideration for chemical storage shall be based on its:

a. frequency of usage
b. compatibility with other chemicals
c. size of the container
d. alphabetical order

A

compatibility with other chemicals

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6
Q

In operating a UV-Vis spectrophotometer, the following shall be done, except for:

a. Before turning on the power, check if the sample holder does not contain anything.
b. Keep the sample compartment open during measurement.
c. If there are any spillage that gets onto the instrument, immediately wipe it away.
d. After turning on, allow the spectrophotometer to initialize and stabilize according to its user
manual.

A

Keep the sample compartment open during measurement.

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7
Q

In maintenance and storage of pH meters, which of the following procedure shall not be done?

a. To keep the electrode bulb moist during storage, store the electrode in distilled water.
b. Rinse pH electrodes in between measurements.
c. Blot the electrode dry after rinsing the pH electrodes.
d. Mild soap solution may be used in general cleaning of the electrodes

A

To keep the electrode bulb moist during storage, store the electrode in distilled water.

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8
Q

In using fume hoods, the following shall be done, except for:

a. Ensure the exhaust is operating before using the hood.
b. The hood shall be kept closed, except during apparatus set-up or when working within the
hood.
c. The hood may be used as a permanent storage area for volatile chemicals when an
appropriate storage cabinet is not available.
d. Items contaminated with odorous or hazardous materials should be removed from the hood
only after decontamination or if placed in a closed outer container to avoid releasing
contaminants into the laboratory air.

A

The hood may be used as a permanent storage area for volatile chemicals when an appropriate storage cabinet is not available.

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9
Q

Which of the following does not require a minimum of annual third party calibration?

a. analytical balance
b. drying oven
c. autoclave
d. sets of weights

A

sets of weights

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10
Q

Which of the following is an oxidizing chemical?

a. potassium dichromate
b. sodium hydride
c. magnesium
d. sodium

A

potassium dichromate

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11
Q

In starting-up laboratory operations the following should be observed except ________.

a. Turning on the hoods, vents and exhaust fans.

b. Turning the equipment and instruments on.

c. Performing the analysis immediately.

d. Monitoring operating parameters.

A

Performing the analysis immediately.

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12
Q
  1. The following must be avoided in using the analytical balance except ______________.

a. Weighing warm objects in the balance.
b. Closing the draft shield before reading the result.
c. Placing the sample not at the center but on the side of the pan.
d. Touching the samples or sample containers with your bare fingers.

A

Closing the draft shield before reading the result.

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13
Q
  1. Which of the following must be performed before using the analytical balance?

a. Cleaning the balance and removing sample residues.
b. Determine the sensitivity of the balance using calibration weight.
c. Checking the level of the balance by adjusting the air bubble.
d. All of the above.

A

All of the above.

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14
Q
  1. Sealable enclosures containing desiccants used to protect chemicals which
    are hygroscopic or which react with water from humidity.

a. Mortar and Pestle
b. Desiccator
c. Evaporating dish
d. Separatory Funnel

A

Desiccators

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15
Q
  1. To determine the specific gravity of a liquid, which of the following glass wares should be used?

a. volumetric flask
b. pycnometer
c. pipette
d. graduated cylinder

A

A hydrometer

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16
Q

Preparation of highly toxic and volatile compounds should be carried out in an efficient
_____________.

a. canopy hood
b. laminar hood
c. fume hood
d. any of the above

A

A fume hood

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17
Q
  1. Which of the following shall not be followed when boiling a solution in a hot plate?

a. Make sure that the glass ware being used is heat resistant
b. Inspect the glass ware for cracks before putting it in the hot plate.
c. Add boiling stones to facilitate boiling.
d. When removing the heated material, use polyethylene gloves to protect your hand from
heat.

A

When removing the heated material, use polyethylene gloves to protect your hand from
heat.

18
Q

18-20. The absorbance of different concentrations of potassium permanganate determined through UV-Vis Spectrophotometer is shown below.

A

solving

19
Q
  1. The conductivity value of a liquid solution increases as the temperature decreases as a result of higher ion mobility.
A

FALSE

20
Q

The alkaline effect is the phenomenon where H+ ions in the gel layer of the pH-sensitive membrane are partly or completely replaced by alkali ions.

A

TRUE

21
Q

In pH measurements, if the solution is acidic, the H+ ions diffuse out of the layer and a negative charge is established on the outer side of the membrane.

A

FALSE

22
Q

Karl Fischer titrator is used to determine viscosity of liquids.

A

FALSE

23
Q

For pipettes marked with To Deliver (TD), a small amount of liquid remaining on the tip should not be blown out.

A

TRUE

24
Q

Cuvettes must be cleaned in an ultrasonic cleaning bath.

A

FALSE

25
Q

In operating the centrifuge, opposing tubes must be of equal weight.

A

TRUE

26
Q

To ensure that glass wares is properly cleaned, the film of water which adheres to the inner glass wall of the glass ware as it is emptied must not be uniform.

A

FALSE

27
Q

Class B volumetric glass ware provides the highest accuracy and passes the ASTM
standard specification for laboratory volumetric glass ware.

A

FALSE

28
Q

In calibration of burettes, volume reading shall be taken with the eye higher than the liquid level to avoid parallax error.

A

FALSE

29
Q

A defined procedure whereby a part of a substance, material or product is taken
to provide for testing or calibration a representative sample of the whole. (ISO /
IEC 17025)

A

Sampling

30
Q

The process of selecting a portion of material, in some manner, to represent or
provide information about a larger body of material.

A

**Sampling**

31
Q

A portion of a material, selected in a specialized manner, which represents a larger
body of material

A

Sample

32
Q

Representative of the bulk (system)

A

Sample

33
Q

Representative of the bulk (system)

A

Sample

34
Q

Retains the properties of the lot, or properties change the same way as the
lot

A

Sample

35
Q

Suitable in amount and form to provide needed information

A

Sample

36
Q

Forms of the lot / bulk / system

A

o Solid / Liquid / Gas
o Homogeneous /Heterogeneous
o Static / Dynamic
o Inorganic / Organic / Biological

37
Q

Types of Sampling

A

o Random Sampling
o Judgmental / Selective Sampling
o Systematic Sampling
o Stratified Sampling

38
Q

Sample is collected a random from the target population
(Random sample).

A

Random Sampling

39
Q

Increments are taken in such a way that any portion of the
bulk has the same probability of being sampled out.

A

Random Sampling

40
Q

Bias is reduced to minimum if not eliminated.

A

Random Sampling

41
Q

Available information about the target population is used to
help select samples (Selective samples)

A

Judgmental / Selective Sampling

42
Q

Sample are taken according to a sampling plan to screen out
materials with certain characteristics and/or select materials
with other relevant characteristics

A

TERMINOLOGIES (5 decks)

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