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Oil and Gas Job Recruitment Aptitude Test Questions and Answers

How many trains have been commissioned since the establishment of the Nigeria LNG?

A depression in the earth’s crust in which sedimentary materials have accumulated is referred to as:

Shaft.

Cave.

Basin.

Curve.

Depressor.

The Nigeria Liquefied Natural Gas Company, also known as Nigeria LNG was established as a limited liability company in what month and year?

January 1990

May 1989

October 1991

September 1990

August 1989

To stop production of a well and plug the wellbore to prevent any possible future leakage into fresh water is referred to as.

Topping.

Abandonment.

Blowout.

Sealing.

Capping.

The Bonny Terminal, owned and operated by Shell Petroleum Development Company is in which state of the federation?

Delta State.

Kogi State.

Bayelsa State.

Cross River State.

Rivers State.

In what month and year was the Nigeria National Petroleum Company (NNPC) established?

December 1999

June 1971

August 1980

April 1977

March 1981

49 : 37

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The Petroleum Industry Governance Bill (PIGB) was passed by the Senate in what year?

2019

2000

2017

2016

2010

Nigeria became a member of the Organization of Petroleum Exporting Countries (OPEC) in what year?

1971

1999

2000

1980

1969

he acronym NCDMB represents in full:

Nigerian Company Development and Monitoring Board

Nigerian capacity Development and Management Board

Nigerian Content Development Managing Board

National Content Development and Monitoring Board

Nigerian Content Development and Monitoring Board

The search for oil and gas through activities such as aerial surveys, geo-physical surveys, geophysical studies, core testing and the drilling of test wells is

Fielding.

Survey.

Examination.

Exploration.

Discovery.

The acronym for the agency responsible for the regulation of petroleum pricing in the downstream sector is?

PPPRA

PPLA

PRPPA

PPARP

PPRA

All operations taking place after crude oil is produced, such as transportation, refining and marketing is referred to as:

Upstream.

Downstream.

Selling.

Trading.

Postproduction activity.

The chairman of the Board of NCDMB is

The Executive Secretary of NCDMB

The Vice President of the Federal republic of Nigeria

The Group Managing Director of NNPC

The President of the Federal Republic of Nigeria

The Minister of State for Petroleum

The Bill that gave birth to the NCDMB was signed into law by which president?

President Umar Yar’Adua

General Olusegun Obasanjo

President Goodluck Jonathan

President Muhammadu Buhari

President Ibrahim Babangida

Since the inception of the NCDMB how many Executive Secretaries were appointed before the current leadership?

A geographical area under which one or more oil or gas reservoirs lie, all of them related to the same geological structure is called?

Reserve

Field

Well

Range

Acreage

All of these are the functions of the Board of the Nigerian Content Development and Monitoring Board (NCDMB) except.

To grow and manage the Nigerian Content Development Fund.

To review, assess and approve Nigerian Content plans developed by operators.

To issue licenses to operators in the upstream sector.

To set guidelines and minimum content levels for project related activities across the oil and gas value chain.

To engage in targeted capacity building interventions that would deepen indigenous capabilities- Human Capital Development, Infrastructure & Facilities, Manufactured Materials & Local Supplier Development.

The burning of gas vented through a pipe or stack at a refinery, or a method of disposing of gas while a well is being drilled is generally referred to as

Flaring

Blasting

Fusion

Ignition

Combustion

Nigeria’s petroleum is classified mostly as ‘light’ and ‘sweet’ because:

It evaporates easily.

It has a sweet colour.

It is soft to touch and smells sweet

It is valuable

It is largely Sulphur free.

Passage

You are a trainee manager on a two-year programme working for Transcorp Hilton Hotels, a national chain of 4 or 5 hotels. The programme ensures that trainees gain experience in all areas of hotel and hospitality management through rotational scheme of 4 months placements. You are currently undertaking your ‘Guest Services’ placement and you are based at the Transcorp Calabar. You are working as second in command in the hotel’s Guest Services team; you report directly to the Guest Relations Manager. The primary job of the Guest Services Team is to ensure that customers of the hotel receive an efficient and friendly welcome and departure, while ensuring the reception and front of house departments operate in an organised manner. The team must ensure a professional, friendly, and courteous service is provided to all guests and that all complaints the hotel receives are handled properly. The Guest Services Staff must also implement Transcorp occupancy policy which is to try to maximise occupancy daily.

QTN: It is 8pm on a Thursday evening in February. Fifty percent of the hotel’s 300 rooms are currently occupied and a customer without previous reservation has just arrived at the reception desk. The customer has enquired about the price of a standard double room. You have informed her that the room rate is N47,000 per night including breakfast. The customer then asks whether you can let her have the room and breakfast for N30,000. Review the following responses A to D and indicate which one you believe to be the response to the situation you would be ‘most likely to make’.

Give her information on the towns inexpensive B&B accommodation and how to find it.
Say that if she returns at 9pm you will probably be available to give her a discount on the standard room rate then.
Say that you can offer her the room at N40,000 for the night and breakfast.
Say that the room is N47,000 and there is no discount available.

QTN: It is 7.30pm. you are on duty at the concierge desk when a guest calls down to say that they have just checked in and are extremely unhappy with the cleanliness of their room. They say that the sink has hair in it, the teacups are smeared, and the curtains are dusty. The guest is only at the hotel for one night and has a business meeting in Calabar first thing in the morning. Review the following responses A to D and indicate which one you believe to be the response to the situation you would be ‘most likely to make’.

Apologize to the customer and say that you will ensure that the room is cleaned thoroughly within the next hour.
Apologize and arrange a complimentary room service meal and bottle of wine to be sent to the room.
Apologize and offer the customer a discount on his room rate
Apologize and offer the customer a different room immediately, if necessary, an upgraded room if no others are available in his original price range.

QTN: The hotel is hosting a large banquet tomorrow night on behalf of a corporate client. The guest list was due to be 150 people, however, just now, you received a call from the client contact and they informed you that they had underestimated the numbers and that they need to increase the quest list to 200 people. It is 10am Review the following responses A to D and indicate which one you believe to be the response to the situation you would be ‘most likely to make’.

Tell the client that the hotel will do everything it can to accommodate the extra numbers and you hope to be able to call them back and confirm the booking.
Tell the client what the increased cost will be for the extra 50 guests based on the amount quoted per person for the original 150.
Thank the client for letting you know about the increase in numbers and then inform the catering team that there will be 50 extra guests.
Thank the client for informing you and say that you will call back to confirm the booking once you have spoken to the catering team.

QTN: It is Saturday morning and you have been informed that a large group booking is going to be transferred from the Sheraton Hotel to your hotel as Sheraton is overbooked. The group requires 110 rooms and the main conference suite to be made available from 6pm this evening. You have room availability tonight but not all the rooms have been prepared and you weren’t expecting a high occupancy level. In order for all the rooms to be prepared the morning shift housekeeping staff will need to work an additional 2 hours each for which they will be paid overtime. Their shift normally ends at 2pm. Review the following responses A to D and indicate which one you believe to be the response to the situation you would be ‘most likely to make’.

Ask the senior housekeeper to let the staff know that they will be required to work an extra two hours today.
Talk to the housekeeping staff and say that unfortunately they will have to work an extra two hours and you are very sorry.
Call the housekeeping staff together and say that you are sorry they will be needed for extra two hours but that hopefully the overtime pay will come in handy
Call the housekeeping staff together as soon as is convenient and then explain the situation to them saying that the group booking is great for the Transcorp as occupancy has been low recently and that they will be helping to keep the hotel running successfully.

Give her information on the towns inexpensive B&B accommodation and how to find it.
Say that if she returns at 9pm you will probably be available to give her a discount on the standard room rate then.
Say that you can offer her the room at N40,000 for the night and breakfast.
Say that the room is N47,000 and there is no discount available.

1) A body is floating in seawater with 2/3 of its volume above the surface. The weight of the displaced water is?
A. Less than the weight of the body
B. Equal to the weight of the body
C. More than the weight of the body
D. Not enough information provided.

Questions 2 – 7 refer to the following: A tank is a vertical cylinder with inside diameter of 6ft and a height of 15ft.

2) What is the weight in pounds of the tank, as in the above case, if the tank itself weighs 20 lbs per ft of height?
A. 63,424 lbs
B. 42,241 lbs
C. 16,151 lbs
D. 10,605 lbs.

3) How much water in gallons would have to be removed to reduce the total weight of the tank plus water, as in the above case, by 20%?
A. 388 gals
B. 3,230 gals
C. 2,121 gals
D. 626 gals.

4) What would be the new level of the water, as measured from the top of the tank, if the water in the above case (equivalent of 20% of total weight) is removed?
A. 10.4 ft
B. 12.7 ft
C. 7.1 ft
D. 7.8 ft.

5) What is the volume of liquid in cubic feet if we fill the tank to one foot high?
A. 28.27 ft3
B. 18.8 ft3
C. 113.1 ft3
D. 424.1 ft3.

6) What is the total volume of the tank in cubic feet?
A. 1686.5 ft3
B. 442.5 ft3
C. 424.1 ft3
D. 847.5 ft3.

7) What is the volume of water in cubic ft in the tank if a measure stick indicates the water surface is 6 feet below the top of the tank?
A. 170.2 ft3
B. 254.4 ft3
C. 1017.9 ft3
D. 678.6 ft3.

For questions 8 to 12, select the correct preposition or adverb:

8) He insisted _____ seeing the documents.
A. by
B. in
C. of
D. on

9) It never occurred _____ me to ask him for proof of his identity.
A. for
B. to
C. on
D. with

10) I object to being kept waiting. Why can’t you be _____ time?
A. on
B. in
C. of
D. at

11) I was _____ the impression that I had paid you for the work you did for me.
A. into
B. over
C. with
D. under

12) Buying presents for children is sometimes very difficult. ___ the end I bought a kite for Tom.
A. At
B. On
C. In
D. By.

13) What are two safety precautions that should be taken before driving your car?

14) In computer jargon, what do you understand by CPU?
A. Computer Processing Unit
B. Computer Procedure Utility
C. Central Processing Unit
D. Central Power Unit.

15) Which of the following pair of countries consist of the permanent security council of UN
A. Brazil, Germany, France, USA, China
B. France, China, USSR, USA, Britain
C. France, Britain, Brazil, New Zealand
D. France, Germany, Japan, China

16) In order to qualify for the post of President in Nigeria the person must be _____ and above
A. 35 years
B. 20 years
C. 40 years
D. 55 years

17) The name Nigeria coined out of _______
A. Niger Forest
B. Niger Area
C. Niger River
D. Niger Textures

18) The first Inspector General of the Police Force was
A. Teslim Balogun
B. Louis Edet
C. Ademola Adetokunbo
D. Mike Okiro.

19) What is the equation for Ohm’s law?
A. V = IR
B. V = I/R
C. R = VI
D. I = VR

20) In direct current I = 3A, R = 4W. Calculate V;
A. 1.33 V
B. 6 V
C. 12 V
D. 24 V

21) What becomes V if we use 2 resistors of 4W in parallel?
A. 2.66 V
B. 6 V
C. 12 V
D. 24 V

22) If x = y – 9, and y – 4 = 10, x = ?
A. -5
B. +5
C. 1
D. A and B

23) What is the force in pounds exerted upwards on a piston with a diameter of 4 inches if a gauge indicates the internal pressure in the cylinder is 1000 psi?
A. 4000 lbs
B. 250 lbs
C. 50,266 lbs
D. 12,566 lbs

24) What is the weight in kilograms of a string of pipe that is 11,500 ft long and weighs .33 pounds per inch?
A. 1,725 kg
B. 20,700 kg
C. 45,540 kg
D. 3795 kg

25) How much time in minutes will it take a car driving at 90 km/hr to travel 27 kilometers?
A. 3.3 minutes
B. 2430 minutes
C. 18 minutes
D. 0.3 minutes

26) What is the total capacity in gallons of a rectangular tank 5 meters in height knowing that it will hold 200 liters per foot?
A. 3281 gal
B. 1000 gal
C. 867 gal
D. 8670 gal

In the following question, a related pair of words or phrases is followed by five lettered pairs of words or phrases. Select the lettered pair that best expresses a relationship similar to that expressed in the original pair.

27) COLOR : SPECTRUM
A. tone : scale
B. sound : waves
C. verse : poem
D. dimension : space

28) Choose the lettered word or phrase that is most nearly opposite in meaning to the word DIFFUSE:
A. concentrate
B. contend
C. imply
D pretend

For questions 29 to 35, select the correct answer:

29) I don’t know_____.
A. where is your pen
B. where your pen is
C. where your is pen
D. where is the pen of yours

If you want to see him, ______.
A. please let me to know
B. let me to know please
C. please let me know
D. let me please to be known
_______, the little girl ran out of the yard.
A. Being afraid of the dog
B. The dog she is afraid of
C. The dog has been afraid of
D. Was being afraid of the dog
The manager_____ here at 4 p.m.
A. is supposing to arrive
B. is supposed to arrive
C. will suppose to arrive
D. is supposed to be arrived
Due to the devaluation, many people have become rich, but many others _______.
A. ruined
B. have been ruined
C. have ruined
D. would have ruined
The man has been hospitalized since yesterday ______.
A. because his serious wound
B. because of his serious wound
C. because of his seriously wound
D. because his wound seriously
Your suggestion, ______ , is beneficial to both the company and the employees.
A. different than his
B. as well as he
C. as he is
D. like his

In the sentence below, choose the word or set of words for each blank that best fits the meaning of the sentence as a whole.

36) Early _____ of hearing loss is ______ by the fact that the other senses are able to compensate for moderate amounts of loss, so that people frequently do not know that their hearing is imperfect.
(A) discovery … indicated
(B) development … prevented
(C) detection … complicated
(D) treatment … facilitated

For questions 37 to 40, choose the correct tense for the verbs in brackets:

37) I usually go by train, but this weekend I am going by bus. It (take) longer but it costs less.
A. take
B. takes
C. is taken
D. will take

38) I (not think) your brother is enjoying the party. He keeps looking at his watch.
A. doesn’t think
B. didn’t think
C. don’t think
D. am not thinking

39) The hall (be) painted at the moment, so it isn’t looking its best.
A. is being
B. is
C. is to be
D. will be

40) At present I’m having my typewriter (repair).
A. repairing
B. repaired
C. is repaired
D. being repaired

41) Which word in the options is most opposite in meaning to the word in capitals? MITIGATE
A. augment
B. palliate
C. appreciate
D. trust
E.destroy

42) Which word in the options is closest in meaning to the word in capitals? HABITUATED
A. constant
B. accustomed
C. colonized
D. commonplace
E. energetic

43) A train travelling at a speed of 75 m.p.h. enters a tunnel that is 2.5 miles long. The length of the train is 0.25 miles. How long does it take for all of the train to pass through the tunnel, from the moment the front enters to the moment the rear emerges?

44) ______ is when heat travels from the warmed end of an object towards the cool end. ______ is when heat travels through space. _______ is when heat from a hotplate is transferred to water in a pan placed on the hotplate.
Insert the three types of heat listed into their correct definition: radiation, conduction, convection.

45) senate, banana, mirage, curate, revoke
Which one of the words in the options below belongs with the words above?
A. ginger
B. humane
C. abacus
D. yogurt
E. sector

46) Which of the following statements are TRUE of limited liability companies?
(I) The company’s exposure to debts and liability is limited
(II) Financial statements must be produced
(III) A company continues to exist regardless of the identity of its owners.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
E. None of the above

47) Which of the following statements about sales tax is/are true?
(1) Sales tax is an expense to the ultimate consumer of the goods purchased.
(2) Sales tax is recorded as income in the accounts of the entity selling the goods.
A. 1 only
B. 2 only
C. Both 1 and 2
D. Neither 1 nor 2
E. Question not clear

48) If the motor M rotates in the direction shown by the arrow as illustrated in the diagram below, what is going on?

1 and 2 are going down
B. 1 goes up and 2 goes down
C. 1 and 2 are going up
D. 1 goes down and 2 goes up

49) For the system in the diagram below to be in equilibrium, what is the mass of P in pounds? The mass at the other end of the beam is 5 kg.

5.5 lb
B. 2.8 kg
C. 10 kg
D. none of these

50) These 3 wells have been drilled with a mud of specific gravity of 1.25 gr/cm3. In which well A, B or C, will the highest hydrostatic bottom hole pressure be recorded ?

Well A
B. Well B
C. Well C
D. All three will have equal bottom hole pressure

51) If the density of A is greater than the density of B. What is going to happen ?

If P floats in liquid A, it will also float in B.
B. If P floats in liquid B, it may or may not float in A, depending on the density of P.
C. If P sinks in B, it will sink in A also.
D. None of the above answers are correct.

52) For the circuit shown below, if V=380VAC and the bulb is rated at 170VAC, 5W, what is the resistance R that should be connected in series to the bulb?

6500 ohms
B. 7000 ohms
C. 7145 ohms
D. 5780 ohms

53) If we increase the voltage across a DC motor, then the motor speed will?
A. decrease
B. increase
C. stay same
D. stop

54) What will be the output voltage of two 12V batteries connected in series?
A. 12 V
B. 6 V
C. 24 V
D. no voltage

55) What will be the output voltage of two 12V batteries connected in parallel?
A. 12 V
B. 6 V
C. 24 V
D. no voltage

56) A model of an atom which contains 24 electrons, 25 protons and 26 neutrons has some of its particles inside a nucleus at the centre of the model. What is the nucleon number (mass number) of the atom?
A. 49
B. 51
C. 50
D. 26

In the distance-time graph for two cyclists A and B below, the cyclists starts a 500 m race together but finishes the race at different times.

57) What is the distance between A and B at time t = 20s.
A. 50m
B. 120m
C. 88m
D. 60m

58) Calculate the difference in the time taken by A and B for the race.
A. 21s
B. 15s
C. 12s
D. 9s

59) How many squares are there on a normal chessboard?
Hint: There are actually 204 squares on a chessboard. There are 64 (1×1) squares. There are 49 (2×2) squares. There are 36 (3×3) squares. There are 25 (4×4) squares. There are 16 (5×5) squares. There are 9 (6×6) squares. Then there are 4 (7×7) squares and 1 big 8×8 square. So, there are a total of 204 squares on a normal chessboard.

60) Three people picked 65 apples altogether. At the first tree they each picked the same number of apples. At the second tree they each picked 3 times as many as they picked at the first tree. When they finished at the third tree, the group had 5 times as many apples as they had when they started at that tree. At the fourth tree the group picked just 5 apples. How many apples did each person pick at the first tree?

61) A bus run at 100 km/hr top speed. It can carry a maximum of 6 persons. If speed of bus decreases in fixed proportion with increase in number of person, find speed when three person are traveling in bus.

62) A man decides to buy a nice horse. He pays $60 for it, and he is very content with the strong animal. After a year, the value of the horse has increased to $70 and he decides to sell the horse. But already a few days later he regrets his decision to sell the beautiful horse, and he buys it again. Unfortunately he has to pay $80 to get it back, so he loses $10. After another year of owning the horse, he finally decides to sell the horse for $90. What is the overall profit the man makes?

63) There are 20 pieces of bread to divide among 20 people. A man eats 3 pieces, woman eats 2 pieces and a child eats half piece of bread. Tell the correct combination of men, women and children so that they are 20 people in total and everyone gets the bread. Note that a man cannot eat less than 3 or more than 3. A woman cannot eat less than 2 or more than 2 and the child cannot eat less than half or more than half piece of the bread. You have to tell there are how may are men, women and children in those 20 people.

64) Divide 30 by half and add ten. What do you get?
Hint: Dividing by half (1/2) is the same as multiplying by 2.

65) If a doctor gives you 3 pills and tells you to take one pill every half hour, how long would it be before all the pills had been taken?
Hint: 1 hour. If you take a pill at 1 o’clock, then another at 1.30 and the last at 2’clock, they will be taken in 1 hour.

66) I went to bed at eight 8 ‘clock in the evening and wound up my clock and set the alarm to sound at nine 9 ‘clock in the morning. How many hours sleep would I get before being awoken by the alarm?
Ans: 1 hour. It is a wind up alarm clock which cannot discriminate between a.m. and p.m.

67) Oil raise up the wick in a lamp. The principle involves
A. the diffusion of oil through the wick
B. the liquid state of oil
C. capillary action phenomenon
D. volatility of oil

68) Superconductors are substances which
A. conduct electricity at low temperature
B. offer high resistance to the flow of current
C. offer no resistance to the flow of electricity
D. conduct electricity at high temperatures

69) Larger buildings may be supplied with a medium voltage electricity supply, and will required a substation or mini-sub. What is the main item of equipment contained in these?
A. Transformer
B. Transponder
C. Transducer
D. Converter

70) To which country does the present UN Secretary-General belongs?
A. Ghana
B. South Korea
C. Portugal
D. Sweden

71) The headquarters of Food and Agriculture Organisation is in
A. Washington
B. Paris
C. Madrid
D. Rome

72) The product of two numbers is 2028 and their H.C.F. is 13. The number of such pairs is:
A. 1
B. 2
C. 3
D. 4

73) What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?
A. 196
B. 630
C. 1260
D. 2520

74) The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?
A. 3
B. 4
C. 9
D. Cannot be determined
E. None of these

75) The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?
A. 69
B. 78
C. 96
D. Cannot be determined
E. None of these

76) A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:
A. 3
B. 5
C. 9
D. 11

77) If m and n are whole numbers such that mn = 121, the value of (m – 1)n + 1 is:
A. 1
B. 10
C. 121
D. 1000

78) A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?
A. 230 m
B. 240 m
C. 260 m
D. 320 m
E. None of these

79) A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is:
A. 48 km/hr
B. 54 km/hr
C. 66 km/hr
D. 82 km/hr

Each question has an underlined word followed by four answer choices. You will choose the word that is a necessary part of the underlined word.

80) harvest
A. autumn
B. stockpile
C. tractor
D. crop

81) desert
A. cactus
B. arid
C. oasis
D. flat

82) book
A. fiction
B. pages
C. pictures
D. learning

83) language
A. tongue
B. slang
C. writing
D. words

84) school
A. student
B. report card
C. test
D. learning

Each of the following questions 85 – 89 consist of two words which have a certain relationship to each other followed by four pairs of related words, Select the pair which has the same relationship.

85) DIVA:OPERA
A. producer:theatre
B. director:drama
C. conductor:bus
D. thespian:play

86) GRAIN:SALT
A. shard:pottery
B. shred:wood
C. blades:grass
D. chip:glass

87) THRUST:SPEAR
A. mangle:iron
B. scabbard:sword
C. bow:arrow
D. fence:epee

88) PAIN:SEDATIVE
A. comfort:stimulant
B. grief:consolation
C. trance:narcotic
D. ache:extraction

89) LIGHT:BLIND
A. speech:dumb
B. language:deaf
C. tongue:sound
D. voice:vibration

90) How many 4-letter words with or without meaning, can be formed out of the letters of the word, ‘LOGARITHMS’, if repetition of letters is not allowed?
A. 40
B. 400
C. 5040
D. 2520

91) In how many different ways can the letters of the word ‘MATHEMATICS’ be arranged so that the vowels always come together?
A. 10080
B. 4989600
C. 120960
D. None of these

92) How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digits is repeated?
A. 5
B. 10
C. 15
D. 20

93) If 6th March, 2005 is Monday, what was the day of the week on 6th March, 2004?
A. Sunday
B. Saturday
C. Tuesday
D. Wednesday

94) On what dates of April, 2001 did Wednesday fall?
A. 1st, 8th, 15th, 22nd, 29th
B. 2nd, 9th, 16th, 23rd, 30th
C. 3rd, 10th, 17th, 24th
D. 4th, 11th, 18th, 25th

95) On 8th Feb, 2005 it was Tuesday. What was the day of the week on 8th Feb, 2004?
A. Tuesday
B. Monday
C. Sunday
D. Wednesday

96) Which of the following tests is not done for transformer oil ?
A. Flash point and acid value.
B. Aniline point.
C. Dielectric strength.
D. Copper strip corrosion test

97) Which is the most undesirable component in kerosene ?
A. Aromatics
B. i-paraffins
C. n-paraffins
D. Naphthenes

98) Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.
A. Smoking tendency of hydrocarbons increases in the order : paraffins → isoparaffins → naphthenes → aromatics.
B. Smoking tendency of paraffins increases with decrease in its molecular weight.
C. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond.
D. Smoking tendency of aromatics decreases with increase in its molecular weight.

99) Persons working in cement plants and limestone quarries are more prone to disease like
A. cancer
B. asthma
C. silicosis
D. flourosis (bone disease)

100) Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.
A. hydrogen sulphide
B. mercury
C. cadmium
D. asbestos

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