Chemistry And Physics Quiz: Science Trivia!

40 Questions | By J1_black | Updated: Mar 22, 2022 | Attempts: 6319

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Chemistry And Physics Quiz: Science Trivia! - Quiz

Do you understand the difference between chemistry and physics? Physics is concerned with the entire universe down to the smallest measurement. Physics provides us with insights regarding space and time. Chemistry concentrates on how substances interact with each other and with energy. Chemistry also studies the properties of matter on a larger scale and the reactions of matter. If you are looking for a chemistry and physics quiz, you have come to the right place.

Questions and Answers

1.

The visible region of the electromagnetic spectrum lies between wavelengths of ________.
- A.
  
  200-300
- B.
  
  340-850
- C.
  
  380-750
- D.
  
  500-900
2.

When plotting the absorbance against the concentration of a colored solution, which obeys Beer's Law, what procedure would be followed to obtain a straight-line graph with a positive slope?
- A.
  
  Plot on semi-logarithmic graph paper with absorbance on semi-log axis
- B.
  
  Plot on arithmetic graph paper
- C.
  
  Plot on log-log paper
- D.
  
  Convert to %T and plot on arithmetic graph paper
- E.
  
  Plot on semi-logarithmic graph paper with concentration on semi-log axis
3.

According to the Beer-Lambert Law, absorbance is:
- A.
  
  Inversely proportional to the concentration
- B.
  
  Directly proportional to the concentration
- C.
  
  Directly proportional to the transmittance
- D.
  
  Directly proportional to the log of the concentration
4.

In measuring the absorbance of a compound at 250 nanometers on a spectrophotometer, we have to use:
- A.
  
  An infra-red sensitive photocell
- B.
  
  A tungsten lamp
- C.
  
  A hydrogen discharge lamp
- D.
  
  A mercury discharge lamp
5.

The intensity of scattered light from suspended particles?
- A.
  
  Holds true in dilute solutions and small particle size
- B.
  
  Holds true as particle size increases
- C.
  
  Directly proportional to wavelength
- D.
  
  All of the above
6.

Light is passed through a solution with a light path of 2 cm and the absorbance is recorded as 0.40. If the light is passed through the same solution at the same wavelength and the light path is reduced to 1 cm, the absorbance should be:
- A.
  
  0.80
- B.
  
  0.40
- C.
  
  0.20
- D.
  
  0.10
7.

Light is passed through a solution with a light path of 2 cm and the absorbance is recorded as 0.40. If the light is passed through the same solution at the same wavelength and the light path is reduced to 1 cm, the absorbance should be:
- A.
  
  0.80
- B.
  
  0.40
- C.
  
  0.20
- D.
  
  0.10
8.

Which of the following wavelengths of light would have the highest radiant energy?
- A.
  
  200 nm
- B.
  
  300 nm
- C.
  
  400 nm
- D.
  
  500 nm
9.

A component of a spectrophotometer that isolates radiant energy of a specific wavelength and excludes that of other wavelengths is called a(n):
- A.
  
  Fluorometer
- B.
  
  Incandescent lamp
- C.
  
  Monochromator
- D.
  
  Photomultiplier tube
10.

To determine if the wavelength selector of a broad-bandpass spectrophotometer is actually isolating the desired wavelength, a __________ should be performed.
- A.
  
  Wavelength calibration with didymium filter
- B.
  
  Linearity check with standard solutions
- C.
  
  Spectral scan of a chromogen
- D.
  
  Photometric zero adjustment
11.

A spectral absorbance curve may be used to:
- A.
  
  Find the wavelength of maximum absorbance
- B.
  
  Select a wavelength best suited for measuring a compound
- C.
  
  Identify an unknown compound by comparing its absorption spectra to that of a known compound
- D.
  
  All of the above
12.

A blank absorbance reading is used to:
- A.
  
  Compensate for variations in reagent interferences and its absorbance is subtracted from the absorbance of the net reaction with sample
- B.
  
  Compensate for variations in reagent and sample interferences and its absorbance is subtracted from the absorbance of the net reaction with sample
- C.
  
  Compensate for variations in sample interferences and its absorbance is subtracted from the absorbance of the net reaction with sample
- D.
  
  Compensate for variations in reagent interferences and light source variation and its absorbance is subtracted from the absorbance of the net reaction with sample
13.

A monochromator's filter must be tested to determine whether it can isolate a specific part of the electromagnetic spectrum. Percent transmittance (%T) of light is plotted against wavelength. It is noted at which wavelengths 50% T occurred. This type of test assesses the filter's:
- A.
  
  Linearity
- B.
  
  Bandpass
- C.
  
  Calibration
- D.
  
  Absorbance Spectrum
14.

Photometry is defined as:
- A.
  
  Measurement of light
- B.
  
  A device used to measure light
- C.
  
  The measurement of the intensity of light at selected wavelengths
- D.
  
  All of the above
15.

Monochromatic light is defined as:
- A.
  
  The measurement of the intensity of light at selected wavelengths
- B.
  
  Emission of light by molecules in an excited state produced by a chemical reaction or the absorption ionizing radiation
- C.
  
  Electromagnetic radiation of one wavelength or extremely narrow wavelengths
- D.
  
  Measurement of scattered light by suspended particles
16.

Which of the following cannot be directly measured?
- A.
  
  Transmitted light
- B.
  
  Incoming light
- C.
  
  Absorbed light
- D.
  
  None of the above
17.

In regard to electromagnetic waves of radiant energy, the distance that a periodic wave propagates in one period of the distance between wave crests is referred to as:
- A.
  
  Wavelength
- B.
  
  Modulation
- C.
  
  Amplitude
- D.
  
  Frequency
18.

What units of measurement are traditionally applied to radiant energy in the visible portion of the electromagnetic spectrum?
- A.
  
  Milimeters (mm)
- B.
  
  Centimeters (cm)
- C.
  
  Micrometers (um)
- D.
  
  Nanometers (nm)
19.

The most sensitive device used in spectrophotometers for the conversion of polychromatic light to monochromatic is:
- A.
  
  Diffraction grating
- B.
  
  Prism
- C.
  
  Glass filter
20.

When the _________, the rate of the reaction depends on the enzyme activity. When the _____________, the rate of the reaction depends on the substrate concentration
- A.
  
  Substrate is in excess, enzyme is in excess
- B.
  
  Enzyme is in excess, Substrate is in excess
21.

Which of the following would have a negative impact on Beer's Law?
- A.
  
  Deviations in absorptivity coefficients at high concentrations (>0.01 M)due to electrostatic interactions between molecules in close proximity
- B.
  
  Scattering of light due to particulates in the sample
- C.
  
  Shifts in chemical equilibria as a function of concentration non-monochromatic radiation
- D.
  
  Stray light
- E.
  
  All of the above
22.

Method requiring the measurement of absorbance in the UV region of the electromagnetic spectrum requires that the sample cuvette be made of:
- A.
  
  Glass
- B.
  
  Plastic
- C.
  
  Quartz
23.

The units for molar absorptivity are:
- A.
  
  L/cm Mol
- B.
  
  Cm Mol/L
- C.
  
  Mol/L cm
- D.
  
  Unitless
24.

Under specified conditions of pH and temperature, the international unit (IU) is defined as:
- A.
  
  The enzyme activity that catalyzes the conversion of 1 mol of substrate in 1 min under standard conditions
- B.
  
  The enzyme activity that catalyzes the conversion of 1 mol of product in 1 min under standard conditions
- C.
  
  The enzyme activity that catalyzes the conversion of 1 umol of substrate in 1 min under standard conditions
- D.
  
  The enzyme activity that catalyzes the conversion of umol of product in 1 min under standard conditions
25.

Which of the following statements about atomic absorption is not true:
- A.
  
  It requires that element to be measurement be brought to a non-ionized ground state
- B.
  
  It uses a tungsten lamp as a light source
- C.
  
  It uses a cathode made of the same element being measured
- D.
  
  It measures the absorption of light