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Home » Engineering » Chemical Engineering » Aptitude Test - 14
1.A concave mirror gives real, inverted and same size image if the object is placed
A. At F
B. At infinity
C. At C
D. At F
2. A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
A. At infinity
B. Between F and C
C. Between P and F
D. At infinity
3.We can see objects because of_______
A. reflection
B. refraction
C. transmission
D. reflection
4.Convex lens focus a real, point sized image at focus, the object is placed
A. At focus
B. Between F and 2F
C. At infinity
D. At focus
5.8 The unit of power of lens is
A. Metre
B. Centimeter
C. Diopter
D. Metre
6.The refractive index of a rarer medium with respect to a denser medium is...
A. 1
B. Greater Than 1
C. Smaller Than 1
D. 1
7.The radius of curvature of a mirror is 20cm the focal length is
A. 20cm
B. 10cm
C. 40cm
D. 20cm
8.Molar absorbtivities of compounds exhibiting charge transfer absorption are
A. small
B. moderate
C. large
D. small
9.Molar absorbtivity is the measure of the
A. amount of light absorbed per unit length
B. amount of light absorbed per unit concentration
C. amount of light reflected and absorbed per unit concentration
D. amount of light absorbed per unit length
10.Which of the following relationships between absorbance and %transmittance is incorrect?
A. A = log10 1 / T
B. A = 2 - log10 %T
C. A = log10 1 / T
D. A = log10 1 / T
11.Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?
A. Because %T cannot be measured as accurately as absorbance
B. Because %T is dependant on the power of the incident radiation
C. Because absorbance is proportional to the concentration of the analyte, whereas %T is not
D. Because %T cannot be measured as accurately as absorbance
12.In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the
A. the Fourier Transfer Algorithm allows us to scan all frequencies at once
B. light is faster today that it used to be
C. absence of broad spectrum of wavelenth
D. the Fourier Transfer Algorithm allows us to scan all frequencies at once
13.Which of the following will oscillate the fastest?
A. A large mass on a weak spring
B. A large mass on a stiff spring
C. A small mass on a stiff spring
D. A large mass on a weak spring
14.In the equation, A = ε bc, what quantity is represented by "ε"?
A. Absorbtivity
B. Molar absorbtivity
C. Path length
D. Absorbtivity
15.Why must the voltage supplied to a tungsten lamp be very stable?
A. Because if it wasn't, the lamp would bum out
B. Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
C. Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
D. Because if it wasn't, the lamp would bum out
16.Where does a carbonyl (C=0) stretch appear in an IR spectrum?
A. 1740-1720
B. 1870-1650
C. 3640-3250
D. 1740-1720
17.Which of the following components of a monochromator is the dispersing element?
A. The collimating lens
B. The entrance slit
C. The diffraction grating
D. The collimating lens
18.A simple harmonic oscillator may absorb energy
A. at anytime.
B. when the frequencies match exactly
C. when the amplitudes are the same.
D. at anytime.
19.UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)?
A. σ → σ*
B. n → σ*
C. n → π* and π → π*
D. σ → σ*
20.Vibrational spectroscopy is
A. a large mass on a weak spring
B. a flashlight through a prism and shake it
C. a class of spectroscopic techniques which analyzes molecular motions
D. a large mass on a weak spring
21.Why are rotational transitions of little use to a spectroscopist?
A. Because the energy required to induce a rotational transition is so small that it cannot be measured
B. Because rotational transitions are extremely rare
C. Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
D. Because the energy required to induce a rotational transition is so small that it cannot be measured
22.Beer's Law states that
A. absorbance is proportional to both the path length and concentration of the absorbing species
B. absorbance is proportional to the log of the concentration of the absorbing species
C. absorbance is equal to P0 / P
D. absorbance is proportional to both the path length and concentration of the absorbing species
23.The capacity to do work is called:
A. Heat
B. Energy
C. work
D. Heat
24.The thermal diffusivities for solids are generally
A. Less than those for gases
B. Less than those for liquids
C. More than those for liquids and gases
D. Less than those for gases
25.Depending on the radiating properties, body will be transparent when (Where a = absorptivity, p = reflectivity, x = transmissivity)
A. P = 0, x = 0 and a = 1
B. P=1, x = 0, and a = 0
C. P = 0, T= 1, and a = 0
D. P = 0, x = 0 and a = 1
26.Thermal diffusivity of a substance is
A. Directly proportional to thermal conductivity
B. Inversely proportional to density of substance
C. Inversely proportional to specific heat
D. Directly proportional to thermal conductivity
27.Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
A. Minimum energy
B. Maximum energy
C. Both (A) and (B)
D. Minimum energy
28.The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as
A. Kirchoff’s law
B. Stefan's law
C. Wien' law
D. Kirchoff’s law
29.Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.
A. Cold body to hot body
B. Hot body to cold body
C. Smaller body to larger body
D. Cold body to hot body
30. According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
A. Absolute temperature
B. T²
C. T⁵
D. Absolute temperature
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