Description : The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels. (A) 60 (B) 90 (C) 105 (D) 120
Last Answer : (B) 90
Description : As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise. (A) 110 (B) 85 (C) 60 (D) 45
Last Answer : (B) 85
Description : Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels. (A) 75 (B) 95 (C) 120 (D) 140
Last Answer : (B) 95
Description : Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels. (A) 85 (B) 105 (C) 125 (D) 145
Last Answer : (B) 105
Description : Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels. (A) 105 (B) 135 (C) 160 (D) 185
Last Answer : (B) 135
Description : The maximum permissible hardness for public supplies is (A) 95 mg/litre (B) 105 mg/litre (C) 115 mg/litre (D) 125 mg/litre
Last Answer : (C) 115 mg/litre
Description : As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m3 .(μg-microgram) (A) 10 (B) 90 (C) 800 (D) 750
Description : Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels. (A) 20 (B) 60 (C) 90 (D) 120
Last Answer : (C) 90
Description : At what height must top rails be fitted above working platform? a. Between 90 cm (35 inches) and 110 cm (43 inches) b. Between 100 cm (39 inches) and 120 cm (47 inches) c. Between 95 cm (38 inches) and 115 cm ( 45 inches) d. Between 105 cm (41 inches)and 125 cm (49 inches)
Last Answer : c. Between 95 cm (38 inches) and 115 cm ( 45 inches)
Description : Maximum permissible limit of noise as per "Noise Pollution Rules 2000 of India" is:
Last Answer : Maximum permissible limit of noise as per "Noise Pollution Rules 2000 of India" is: A. 60 decibles B. 70 decibels C. 80 decibels D. 100 decibels.
Last Answer : Maximum permissible limit of noise as per "Noise Pollution Rules 2000 of India" is: A. 75 dB B. 65 dB C. 55dB D. 45dB
Description : Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools). (A) 1-2 (B) 5-10 (C) 15-20 (D) 25-30
Last Answer : (B) 5-10
Description : Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels. (A) 120 (B) 140 (C) 170 (D) 200
Last Answer : (C) 170
Description : Noise level during normal conversation among men is about __________ decibels. (A) 10 (B) 45 (C) 90 (D) 115
Last Answer : (B) 45
Description : Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels. (A) 3 (B) 30 (C) 7 (D) 70
Last Answer : (A) 3
Description : Noise level in a quiet private business office is about __________ decibels. (A) 25 (B) 50 (C) 70 (D) 85
Last Answer : (B) 50
Description : . Noise level inside a jet airliner in normal flight is about __________ decibels. (A) 80 (B) 100 (C) 125 (D) 150
Last Answer : (B) 100
Description : Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million). (A) 0.002 (B) 0.2 (C) 1.2 (D) 4.8
Last Answer : (B) 0.2
Description : Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm. (A) < 1 (B) 10-100 (C) 100-200 (D) 100-1000
Last Answer : (A) < 1
Description : Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c. (A) 1 (B) 7 (C) 19 (D) 82
Last Answer : (B) 7
Description : Permissible noise level at Residential area during night time is : (1) 45 dB (2) 55 dB (3) 75 dB (4) 80 dB
Last Answer : (1) 45 dB Explanation: As per the norm, the permissible noise level in residential areas is 45 db during night time, 55 db during day and in commercial areas it is 55 db during night and 65 db during day.
Description : Permissible noise level at Residential area during night time is : (1) 45 dB (A) (2) 55 dB (A) (3) 75 dB (A) (4) 80 dB (A)
Last Answer : 45 dB (A)
Description : The Sweep coverage is to ha/day. a. 1.75 to 2.5 b. 1.95 to 3.5 c. 1.35 to 2.3
Last Answer : 1.75 to 2.5
Description : Aniline point of high speed diesel may be about __________ °C. (A) 35 (B) 70 (C) 105 (D) 150
Last Answer : (B) 70
Description : Indicate the false statement. Noise figure is defined as A. the ratio of the S/N power supplied at the input terminal of a receiver or amplifier to the S/N power supplied to the output or ... under test, both working at the same temperature over the same bandwidth and fed from the same source
Last Answer : C. an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals
Description : What bandwidth is needed to support a capacity of 128 kbps when the signal power to noise power ratio in decibels is 100? A. 19224 Hz B. 3853 Hz C. 19244 Hz D. 3583 Hz
Last Answer : B. 3853 Hz
Description : Noise Pollution is measured in a) Hertz b) Fathoms c) Manometers d) Decibels.
Last Answer : d) Decibels.
Description : The standard audible capacity of a healthy human being as per World Health Organi-sation is in the range of - (1) 45-50 decibels (2) 200-250 decibels (3) 5-10 decibels (4) 2000-2500 decibels
Last Answer : (3) 5-10 decibels Explanation: Hearing range usually describes the range of frequencies that can be heard by an animal or human, though it can also refer to the range of levels. In humans the audible ... as low as 12 Hz under ideal laboratory conditions, to 20 kHz in most children and some adults.
Description : The standard audible capacity of a healthy human being as per World Health Organi-sation is in the range of (1) 45-50 decibels (2) 200-250 decibels (3) 5-10 decibels (4) 2000-2500 decibels
Last Answer : 5-10 decibels
Description : The maximum permissible speed recommended for Indian Railways for 1 in 8 and half crossing is a)16 kmph* b) 20 kmph c)24 kmph
Last Answer : a)16 kmph*
Description : Grinding efficiency of a ball mill is of the order of __________ percent. (A) 1-5 (B) 40-50 (C) 75-80 (D) 90-95
Last Answer : (A) 1-5
Description : Quantity of coke produced from metallurgical coal may be around __________ percent. (A) 30 (B) 50 (C) 75 (D) 95
Last Answer : (C) 75
Description : Most chemical plants use an initial working capital amounting to 10- 20% of the total capital investment. But this percentage may increase to __________ percent in case of seasonal products manufacturing plant. (A) 30 (B) 50 (C) 75 (D) 95
Description : Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm). (A) Highly (B) Moderately (C) Extremely (D) Very extremely
Last Answer : (B) Moderately
Description : The normal values for creatinine clearance varies from (A) 20–40 ml/min (B) 40–60 ml/min (C) 70–85 ml/min (D) 95–105 ml/min
Last Answer : Answer : D
Description : After accounting for SDA, the net gain of energy from 25 gm of carbohydrates is about (A) 70 kcal (B) 95 kcal (C) 100 kcal (D) 105 kcal
Last Answer : Answer : B
Description : A carton contains 12 green and 8 blue bulbs .2 bulbs are drawn at random. Find the probability that they are of same colour. A) 91/47 B) 47/105 C) 47/95 D) 95/47
Last Answer : Answer: C) Let S be the sample space Then n(S) = no of ways of drawing 2 bulbs out of (12+8) = 20c2=20*19/2*1=190 Let E = event of getting both bulbs of same colour Then, n(E) = no of ways (2 bulbs out of 12) ... 12C2+ 8C2=(132/2)+(56/2) = 66+28 = 94 Therefore, P(E) = n(E)/n(S) = 94/190 = 47/95
Description : The theoretical stress-strain curve of the concrete in the Limit State design of structures is correspondingly reduced by the factor [ A ] 0.35 [ B ] 0.5 [ C ] 0.67 [ D ] 0.75
Last Answer : [ C ] 0.67
Description : The average score in a bank examination of 13 students of a class is 50. If the scores of the top five students are not considered, the average score of the remaining students falls by 5. The pass mark ... integral scores, the maximum possible score of the topper is. A) 85 B) 90 C) 95 D) 100
Last Answer : D Average = Sum of observations/Number of observations Given, average score in a bank examination of 13 students of a class is 50. Sum of total scores = 13 50= 650 Given, if the scores of the top five students are not ... b + c + d + e = 290 ⇒46+ 47 + 48+ 49 +e = 290 ⇒e = 100
Description : In case of foundations on sandy soil, maximum permissible differential settlement, is usually limited to (A) 15 mm (B) 25 mm (C) 35 mm (D) 45 mm
Last Answer : Answer: Option B
Description : Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. (A) 90 (B) 120 (C) 150 (D) 180
Last Answer : (B) 120
Description : Shouting by a man at his full voice corresponds to a voice level of about __________ decibels. (A) 25 (B) 50 (C) 80 (D) 120
Last Answer : (C) 80
Description : A sand sample has a fineness modulus of 1.95. Whether this sand can be used for concreting? Explain the procedure to bring the fineness modulus in required permissible limits. State its importance.
Last Answer : The given sand sample has a fineness modulus 1.95, which is less than prescribed limit i.e.2.2-3.2. It indicates that sand particles are finer, which is not suitable for satisfactory ... . Well graded sand is also useful for good bonding of particles and related strength criteria of concrete.
Description : Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent. (A) 15 to 25 (B) 35 to 45 (C) 55 to 75 (D) 75
Last Answer : (B) 35 to 45
Description : Relative cost of chemical process plants in India is about __________ percent more than the similar plants in U.S.A. (A) 15 (B) 35 (C) 55 (D) 75
Last Answer : (B) 35
Description : The approximate height of a blast furnace having a useful volume of 2000 m3is about __________ metres (A) 25 (B) 35 (C) 55 (D) 75
Last Answer : (C) 55
Description : A bacterium divides every 35 minutes. If a culture containing 105 cells per mL is grown for 175 minutes, what will be the cell concentration per mL after 175 minutes? (a) 35 × 105 cells (b) 32 × 105 cells (c) 175 × 105 cells (d) 85 × 105 cells
Last Answer : b) 32 × 105 cells
Last Answer : (b) 32 × 105 cells
Description : To devitalize weed seeds in manure, the composting temperature must be in which of the following range a). 35-50 °C b). 50-65 °C c). 65-90 °C d). 90-105 °C
Last Answer : c). 65-90 °C