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Home » Engineering » Aptitude Test - 75
Hassan
1.For the diffuse surfaces
A. the intensity of emitted radiation is constant and depends upon the direction
B. the intensity of emitted radiation is not constant and depends upon the direction
C. the intensity of emitted radiation is constant and does not depend upon the direction
D. the intensity of emitted radiation is constant and depends upon the direction
2. What is the relation between absorptivity (α), reflectivity (ρ) and transmissivity (τ) for gray body?
A. ρ + α + τ =1
B. α + τ =1
C. ρ + τ =1
D. ρ + α + τ =1
3.What is irradiation (G)?
A. the total radiation incident upon a surface per unit time per unit surface area
B. the total radiation leaving a surface per unit time per unit surface area
C. the net radiation exchanging between two surfaces per unit time per unit surface area
D. the total radiation incident upon a surface per unit time per unit surface area
4.The total radiation leaving a surface per unit time per unit surface area is called as
A. radiosity
B. irradiosity
C. irradiation
D. radiosity
5.Radiosity (J) is the sum of radiation
A. emitted, reflected and absorbed
B. emitted, reflected and transmitted
C. transmitted, reflected and absorbed
D. emitted, reflected and absorbed
6. Radiation shields are used
A. to increase radiant heat transfer
B. to decrease radiant heat transfer
C. to maintain radiant heat transfer constant
D. to increase radiant heat transfer
7.Which surface can be best described as a radiation shield?
A. the surface which has very high absorptivity
B. the surface which has very high transmissivity
C. the surface which has very high reflectivity
D. the surface which has very high absorptivity
8. Which object can be used as a radiation shield?
A. polished transparent glass
B. mirror
C. rubber
D. polished transparent glass
9.Which of the following gases is/are not capable to emit and to absorb radiant heat energy?
A. Nitrogen (N2)
B. Water vapour (H2O )
C. Carbon monoxide (CO)
D. Nitrogen (N2)
10. Which of the following gases is/are capable to emit and to absorb radiant heat energy?
A. Carbon dioxide (CO2)
B. Sulphur dioxide (SO2)
C. Ammonia (NH3)
D. Carbon dioxide (CO2)
11. Gases absorb and emit radiant energy
A. in all wavelengths over the entire spectrum (λ = 0 to ∞)
B. only between narrow ranges of wavelengths
C. only at single constant wavelength
D. in all wavelengths over the entire spectrum (λ = 0 to ∞)
12. Which among the following factors is/are taken into account in calculation of radiation emitted or absorbed by a gas layer?
A. thickness of the gas layer
B. shape of the gas enclosure
C. . pressure in gas enclosure
D. thickness of the gas layer
13.How is the incident radiation absorbed by a gas layer?
A. A gas layer absorbs incident radiation slowly
B. A gas layer absorbs incident radiation rapidly
C. doesn't matter
D. A gas layer absorbs incident radiation slowly
14.What is the relation between the intensity of radiation and the thickness of the layer, in case of gas?
A. the intensity of radiation increases with increase in the thickness of gas layer
B. the intensity of radiation decreases with increase in the thickness of gas layer
C. the intensity of radiation remains unaffected with change in the thickness of gas layer
D. the intensity of radiation increases with increase in the thickness of gas layer
15.90% of the incident radiation on glass in the visible range is
A. absorbed
B. reflected
C. transmitted
D. absorbed
16. In greenhouse effect, the only infrared radiations
A. are allowed to exit from the interior surface
B. are not allowed to exit from the interior surface
C. cannot absorb heat energy
D. are allowed to exit from the interior surface
17.How is the greenhouse effect experienced on earth?
A. global worming
B. pollution
C. both a. and b.
D. global worming
18. Which of the following gases is/are responsible for global warming?
A. Carbon dioxide (CO2)
B. Water vapour (H2O)
C. Both (a) and (b)
D. Carbon dioxide (CO2)
19. In desert areas, there is large difference between day and night temperatures mainly because of
A. presence of carbon dioxide in air as it acts as barrier for emanating infrared radiation from the earth surface
B. presence of water vapour in air as it acts as barrier for emanating infrared radiation from the earth surface
C. absence of carbon dioxide in air as it acts as barrier for emanating infrared radiation from the earth surface
D. presence of carbon dioxide in air as it acts as barrier for emanating infrared radiation from the earth surface
20.How is the cooling at night in coastal areas?
A. the day temperature reduces rapidly at night in coastal areas
B. . the day temperature reduces slowly at night in coastal areas
C. the day temperature and a night temperature in coastal areas are similar
D. the day temperature reduces rapidly at night in coastal areas
21.The radiation energy from the sun is produced by
A. fission reaction
B. fusion reaction
C. both a. and b.
D. fission reaction
22. When light falls on a smooth polished surface, most of it
A. is reflected in the same direction
B. is reflected in different directions
C. is scattered
D. is reflected in the same direction
23. Image formed by reflection from a plane mirror is
A. real and inverted
B. virtual and erect
C. real and erect
D. real and inverted
24.If an incident ray passes through the focus, the reflected ray will
A. pass through the pole
B. be parallel to the principal axis
C. retrace its path
D. pass through the pole
25.Magnifying power of a concave lens is
A. always > 1
B. always < 1
C. always = 1
D. always > 1
26.The image formed by a convex lens can be
A. virtual and magnified
B. virtual and diminished
C. virtual and of same size
D. virtual and magnified
27.A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:
A. at infinity
B. at focus
C. at the pole
D. at infinity
28.Focal length of a concave mirror is
A. negative
B. positive
C. depends on the position of object
D. negative
29. If the power of a lens is – 2 D, what is its focal length?
A. +50 cm
B. -100 cm
C. -50 cm
D. +50 cm
30.A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be
A. both concave
B. both convex
C. the mirror is concave and the lens is convex
D. both concave
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