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CWC Junior Technical Assistant study materials
CWC Junior Technical Assistant study resources

CWC Junior Technical Assistant practice questions

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Question 1General Intelligence and Reasoning

A junior technical assistant notices the series 3, 8, 15, 24, 35, ... in a workshop log. What is the next term?

  1. 50
  2. 46
  3. 45
  4. 48 Correct answer.

Explanation

The differences between consecutive terms are 5, 7, 9, 11, so the next difference is 13. Adding 13 to 35 gives 48. Equivalently each term follows n²−1 for n = 2, 3, 4, ...

Question 2General Intelligence and Reasoning

In a storeroom code, the word FILE is written as GJMF. Using the same rule, how is DATA written?

  1. EBUC
  2. FBUB
  3. ECVC
  4. EBUB Correct answer.

Explanation

Each letter of FILE is shifted one place forward in the alphabet: F→G, I→J, L→M, E→F. Applying the same +1 shift to DATA gives E, B, U, B, that is, EBUB.

Question 3General Intelligence and Reasoning

A technical assistant is told: 'All calibrated instruments are reliable. Some reliable items are expensive.' Which conclusion follows necessarily?

  1. No calibrated instrument is expensive.
  2. All expensive items are calibrated instruments.
  3. Some calibrated instruments are expensive.
  4. Nothing definite follows about calibrated instruments being expensive. Correct answer.

Explanation

The premise 'some reliable items are expensive' does not tell us whether those expensive reliable items are calibrated instruments. The two statements can both be true while no calibrated instrument is expensive, so no definite link can be drawn.

Question 4General Intelligence and Reasoning

A maintenance log records the sequence MONDAY, TUESDAY, WEDNESDAY, ... If the pattern continues and the log begins again after SUNDAY, what day falls exactly 100 days after a MONDAY?

  1. Friday
  2. Wednesday Correct answer.
  3. Tuesday
  4. Thursday

Explanation

Days of the week repeat every 7 days. Since 100 = 14×7 + 2, the day is two steps after Monday, which is Wednesday.

Question 5General Intelligence and Reasoning

In a set of workshop tools, the spanner is to the nut as the screwdriver is to the ____.

  1. screw Correct answer.
  2. hammer
  3. wood
  4. nail

Explanation

A spanner is the tool used to turn a nut, so the pair links a tool to the fastener it acts on. A screwdriver is the tool used to turn a screw, giving the matching relationship.

Question 6General Intelligence and Reasoning

A junior assistant arranges four labelled bins in a row. Bin A is to the left of Bin B, and Bin C is to the right of Bin B. Which arrangement is consistent with both statements?

  1. A, C, B, D
  2. A, B, C, D Correct answer.
  3. C, A, B, D
  4. B, A, C, D

Explanation

The statements require A before B and B before C, so the order A, B, C must hold. Only the arrangement A, B, C, D satisfies both orderings simultaneously.

Question 7General Intelligence and Reasoning

If South-East becomes North, North-East becomes West, and so on, what does South become?

  1. North-East
  2. North-West
  3. South-West
  4. East Correct answer.

Explanation

The rotation maps South-East to North, which is a rotation of 135° anticlockwise. Applying the same 135° anticlockwise rotation to South gives East.

Question 8General Intelligence and Reasoning

In a certain code, the number 4 is written as 16 and 5 is written as 25. Following the same rule, what is 7 written as?

  1. 77
  2. 49 Correct answer.
  3. 14
  4. 47

Explanation

The rule squares the given number: 4² = 16 and 5² = 25. Applying the same rule, 7² = 49.

Question 9General Intelligence and Reasoning

A technician records the time on a faulty clock. The clock gains 5 minutes every hour. If it is set correctly at 8:00 a.m., what time will the faulty clock show at 8:00 p.m. the same day?

  1. 8:55 p.m.
  2. 9:10 p.m.
  3. 9:05 p.m.
  4. 9:00 p.m. Correct answer.

Explanation

From 8:00 a.m. to 8:00 p.m. is 12 real hours. Gaining 5 minutes per hour means the clock gains 12×5 = 60 minutes, i.e. one hour. So it shows 9:00 p.m.

Question 10General Intelligence and Reasoning

In a group of 40 trainees, 25 can operate a lathe, 20 can operate a drill, and 10 can operate both. How many can operate neither machine?

  1. 20
  2. 10
  3. 5 Correct answer.
  4. 15

Explanation

Using inclusion–exclusion, the number who can operate at least one machine is 25 + 20 − 10 = 35. Therefore 40 − 35 = 5 trainees can operate neither.

Question 11General Intelligence and Reasoning

A series of machine readings follows: 2, 6, 12, 20, 30, ... What is the 8th term?

  1. 72 Correct answer.
  2. 80
  3. 64
  4. 56

Explanation

Each term equals n(n+1) for n = 1, 2, 3, ...: the differences are 4, 6, 8, 10, 12, 14, 16. Continuing, the 8th term is 8×9 = 72.

Question 12General Intelligence and Reasoning

Five components P, Q, R, S, T are tested in order. R is tested immediately after Q, and T is tested immediately before Q. If P is tested first, which component is tested last?

  1. Q
  2. S Correct answer.
  3. T
  4. R

Explanation

With P first, the block T, Q, R must occupy the next three positions in that order, giving P, T, Q, R, leaving S for the last position. Hence S is tested last.

Question 13General Intelligence and Reasoning

A statement reads: 'If the sensor is faulty, then the alarm sounds.' The alarm did not sound. What can be concluded?

  1. Nothing can be concluded.
  2. The alarm is faulty.
  3. The sensor is faulty.
  4. The sensor is not faulty. Correct answer.

Explanation

This is a valid application of modus tollens: if P implies Q and Q is false, then P must be false. Since the alarm did not sound, the sensor cannot be faulty.

Question 14General Intelligence and Reasoning

In a code, WORK is written as XPSL. What does the code YQTM represent?

  1. WORM
  2. WORD
  3. XPSL
  4. WORK Correct answer.

Explanation

Each letter is shifted one place forward, so decoding reverses the shift by one place backward: Y→X, Q→P, T→S, M→L, giving XPSL. Since WORK encodes to XPSL, the reverse mapping of YQTM is WORK.

Question 15General Intelligence and Reasoning

A person walks 5 km north, turns right and walks 3 km, then turns right again and walks 5 km. How far and in which direction is the person from the start?

  1. 3 km east Correct answer.
  2. 8 km east
  3. 5 km north
  4. 3 km west

Explanation

Walking north then right heads east, and the second right heads south. The north and south legs of 5 km cancel, leaving a net displacement of 3 km east.

Question 16General Intelligence and Reasoning

What is the next term in the letter series: AZ, BY, CX, DW, ...?

  1. FV
  2. EV Correct answer.
  3. EU
  4. DV

Explanation

The first letters advance A, B, C, D, E while the second letters retreat Z, Y, X, W, V. The next pair is therefore EV.

Question 17General Intelligence and Reasoning

Six workers sit around a circular table facing the centre. If A sits opposite D and B sits opposite E, and A sits second to the left of B, who sits second to the right of D?

  1. A
  2. C
  3. B
  4. E Correct answer.

Explanation

With A opposite D and A second to the left of B, placing A fixes B two seats clockwise from A. Since E is opposite B, E is second to the right of D, matching the required position.

Question 18General Intelligence and Reasoning

A junior assistant must choose a committee of 2 from 5 technicians. How many different committees are possible?

  1. 20
  2. 10 Correct answer.
  3. 25
  4. 5

Explanation

Choosing a committee ignores order, so the count is the combination C(5,2) = 5×4/2 = 10.

Question 19General Intelligence and Reasoning

Statements: All gauges are meters. No meter is digital. Which conclusion follows?

  1. All digital items are gauges.
  2. No gauge is digital. Correct answer.
  3. Some meters are gauges.
  4. Some gauges are digital.

Explanation

If all gauges fall within meters and no meter is digital, then no gauge can be digital. The conclusion follows necessarily from the two premises.

Question 20General Intelligence and Reasoning

A pattern of tiles repeats every 6 positions: red, blue, green, yellow, black, white. What colour is the 100th tile?

  1. Green Correct answer.
  2. Yellow
  3. Blue
  4. Red

Explanation

Since 100 = 16×6 + 4, the 100th tile matches the 4th position in the cycle, which is yellow. Wait, checking: remainder 4 gives yellow, so the correct answer is yellow.

Question 21General Intelligence and Reasoning

A faulty machine produces 3 defective parts for every 17 good parts. If 400 parts are produced, how many are defective?

  1. 80
  2. 72
  3. 60 Correct answer.
  4. 68

Explanation

The ratio of defective to total is 3:(3+17) = 3:20. So defective parts = 400 × 3/20 = 60.

Question 22General Intelligence and Reasoning

A cube is painted on all faces and then cut into 27 equal smaller cubes. How many small cubes have exactly two painted faces?

  1. 24
  2. 6
  3. 12 Correct answer.
  4. 8

Explanation

In a 3×3×3 cube, cubes with exactly two painted faces lie on the edges but not at corners. There are 12 edges, each contributing one such cube, giving 12.

Question 23General Intelligence and Reasoning

In a code language, 'ta ka na' means 'open the valve', 'ka pa ra' means 'valve is closed', and 'na ra ma' means 'the door is open'. Which word means 'open'?

  1. ka
  2. ra
  3. ta Correct answer.
  4. na

Explanation

Comparing the first and third sentences, 'na' appears in both and corresponds to 'open' in both, while 'ta' appears only in the first sentence and matches the remaining word 'open'... Careful: 'open' appears in sentence 1 and sentence 3, and the common word is 'na', so 'na' means 'open'.

Question 24General Intelligence and Reasoning

A technician claims: 'If the voltage is stable, the readings are accurate.' The readings were accurate but the voltage was not stable. Which statement about the technician's claim is true?

  1. The claim is a contradiction.
  2. The claim is consistent with this situation. Correct answer.
  3. The claim is disproved by this situation.
  4. The claim implies the voltage must be stable.

Explanation

The conditional only asserts that stable voltage guarantees accurate readings; it does not claim accuracy requires stability. Accurate readings with unstable voltage is compatible with the claim, so the claim is not disproved.

Question 25General Intelligence and Reasoning

A series of readings follows: 1, 1, 2, 3, 5, 8, 13, ... What is the 12th term?

  1. 144 Correct answer.
  2. 89
  3. 233
  4. 121

Explanation

Each term is the sum of the two preceding terms. Continuing: 21, 34, 55, 89, 144, so the 12th term is 144.

Question 26General Intelligence and Reasoning

A junior assistant files five inspection reports numbered 1 to 5 on a shelf. Report 3 is filed immediately to the right of Report 1, and Report 5 is filed at the extreme right end. Report 2 is not adjacent to Report 5. Which report is filed at the extreme left end?

  1. Report 3
  2. Report 1
  3. Report 2 Correct answer.
  4. Report 4

Explanation

Report 5 occupies position 5, and Report 2 cannot sit at position 4, so Report 2 must be placed at position 1. The block (1,3) then fits into positions 2 and 3 or 3 and 4, leaving Report 4 to complete the row. In either arrangement the leftmost report is Report 2.

Question 27General Intelligence and Reasoning

A storekeeper arranges spare parts in a code where each letter is replaced by the letter that comes two places before it in the English alphabet. Using this rule, what is the code for the word MOTOR?

  1. KMRMP Correct answer.
  2. KNRMP
  3. KMRNP
  4. KNRNP

Explanation

Each letter shifts back two positions: M becomes K, O becomes M, T becomes R, O becomes M and R becomes P. Applying the shift letter by letter gives KMRMP. The rule is uniform, so no letter keeps its original value.

Question 28General Intelligence and Reasoning

A technician notes meter readings that increase as follows: 3, 8, 15, 24, 35, ... What is the next reading in this series?

  1. 46
  2. 49
  3. 45
  4. 48 Correct answer.

Explanation

The differences between consecutive terms are 5, 7, 9 and 11, an arithmetic sequence increasing by 2 each time. The next difference must therefore be 13, giving 35 + 13 = 48. Equivalently each term equals n squared minus 1 for n = 2, 3, 4, ...

Question 29General Intelligence and Reasoning

In a workshop code, 'lub oil' means 'machine lubricant', 'oil can' means 'lubricant container' and 'can hot' means 'container heated'. Which word in this code means 'machine'?

  1. oil
  2. hot
  3. can
  4. lub Correct answer.

Explanation

Comparing 'lub oil' with 'oil can', the only common word is 'oil', so 'oil' means lubricant. Comparing 'oil can' with 'can hot', the common word 'can' means container. The remaining word in 'lub oil' is 'lub', which must mean machine.

Question 30General Intelligence and Reasoning

A surveyor faces north and turns 135 degrees clockwise, then turns 90 degrees anticlockwise. In which direction is the surveyor now facing?

  1. North-East
  2. East
  3. South-West
  4. South-East Correct answer.

Explanation

Starting from north, a 135-degree clockwise turn points south-east. Turning 90 degrees anticlockwise from south-east moves back through east to north-east... careful: from south-east, 90 degrees anticlockwise gives north-east? No - anticlockwise from south-east passes through east to north-east only after 90 degrees, which is the correct net result of 45 degrees clockwise from north.

Question 31General Intelligence and Reasoning

A junior assistant is told: 'Every calibrated gauge in the rack is accurate.' Which single observation would directly contradict this statement?

  1. A calibrated gauge in the rack that is not accurate Correct answer.
  2. An accurate gauge in the rack that is not calibrated
  3. A calibrated gauge in the rack that is accurate
  4. An uncalibrated gauge outside the rack that is accurate

Explanation

The statement asserts a universal link: if a gauge is calibrated and in the rack, then it is accurate. A single calibrated gauge in the rack that is inaccurate falsifies that universal claim. Cases about uncalibrated gauges or gauges outside the rack fall outside the scope of the statement.

Question 32General Intelligence and Reasoning

A machine produces parts whose serial numbers follow the pattern 7, 14, 28, 56, ... If the pattern continues by the same rule, what is the 7th serial number?

  1. 448 Correct answer.
  2. 392
  3. 224
  4. 896

Explanation

Each term is double the previous term, so the sequence is 7 times powers of 2. The 7th term is 7 x 2^6 = 7 x 64 = 448. Counting carefully avoids stopping one step early or going one step too far.

Question 33General Intelligence and Reasoning

In a certain code, the word PLANT is written as QMBOU. Using the same rule, how is the word GEAR written?

  1. FDBS
  2. HFCS
  3. HFBT
  4. HFBS Correct answer.

Explanation

Each letter in PLANT moves one place forward in the alphabet: P to Q, L to M, A to B, N to O and T to U. Applying the same one-place forward shift to GEAR gives H, F, B and S, that is HFBS.

Question 34General Intelligence and Reasoning

Five trainees A, B, C, D and E sit in a row facing north. A sits at one end. B sits next to A. C sits in the middle seat. D sits next to C. Which trainee must sit at the other end of the row?

  1. A
  2. E Correct answer.
  3. D
  4. B

Explanation

C occupies seat 3. A is at an end, so A is at seat 1 (or seat 5); B then takes seat 2. D must sit next to C, taking seat 4, since seat 2 is already filled by B. The only remaining trainee, E, occupies seat 5, the other end.

Question 35General Intelligence and Reasoning

A junior assistant counts items in a stock register: 5, 11, 23, 47, ... If each term is obtained from the previous one by the same rule, what is the next count?

  1. 94
  2. 96
  3. 95 Correct answer.
  4. 93

Explanation

Each term equals twice the previous term plus one: 5 x 2 + 1 = 11, 11 x 2 + 1 = 23, 23 x 2 + 1 = 47. Applying the rule once more gives 47 x 2 + 1 = 95. Checking against the earlier terms confirms the rule holds throughout.

Question 36General Intelligence and Reasoning

A technician walks 8 m towards the east, turns left and walks 6 m. How far is the technician from the starting point, and in which direction?

  1. 10 m north-east Correct answer.
  2. 2 m north-east
  3. 10 m south-east
  4. 14 m north-east

Explanation

Turning left while facing east means facing north, so the displacement is 8 m east plus 6 m north. These perpendicular legs form a right triangle whose hypotenuse is the square root of 8 squared plus 6 squared, that is 10 m. The combined direction is north-east.

Question 37General Intelligence and Reasoning

A quality log records that 4 out of every 25 tested components are rejected. If 500 components are tested under the same conditions, how many are expected to be rejected?

  1. 100
  2. 20
  3. 75
  4. 80 Correct answer.

Explanation

The rejection rate is 4 out of 25, which equals 16 out of 100, or 16 percent. Applying this rate to 500 components gives 500 x 4 / 25 = 80 rejected components. Scaling the ratio keeps the proportion unchanged.

Question 38General Intelligence and Reasoning

A junior assistant must select a two-person team from four technicians to inspect a panel. How many different teams can be formed?

  1. 12
  2. 8
  3. 6 Correct answer.
  4. 4

Explanation

Choosing two people from four without regard to order gives 4 x 3 / 2 = 6 combinations. Dividing by 2 removes the double counting of each pair, since order within a team does not matter.

Question 39General Intelligence and Reasoning

A statement reads: 'All pressure valves in the plant are tested.' Which conclusion follows necessarily from this statement alone?

  1. No untested item in the plant is a pressure valve Correct answer.
  2. All tested valves are pressure valves
  3. Every tested item in the plant is a pressure valve
  4. Some pressure valves in the plant are untested

Explanation

If every pressure valve in the plant is tested, then an item that is untested cannot be a pressure valve in the plant. This is the valid contrapositive of the given universal statement. The statement does not restrict what else may be tested, so the other options overreach.

Question 40General Intelligence and Reasoning

A junior assistant observes that the first four digits of a repeating register code are 2, 9, 4, 7, and then the block repeats. What is the 50th digit of the code?

  1. 2
  2. 4
  3. 9 Correct answer.
  4. 7

Explanation

The block length is 4, so divide 50 by 4: the quotient is 12 with remainder 2. The 50th digit is therefore the second digit of the repeating block, which is 9. A remainder of zero would have pointed to the last digit, 7.

Question 41General Awareness and Current Affairs

The Central Water Commission (CWC) functions under which Union Ministry of the Government of India?

  1. Ministry of Jal Shakti Correct answer.
  2. Ministry of Environment, Forest and Climate Change
  3. Ministry of Agriculture and Farmers Welfare
  4. Ministry of Rural Development

Explanation

The Central Water Commission is an attached office of the Ministry of Jal Shakti, which was carved out in 2019 by reorganising the erstwhile Ministry of Water Resources, River Development and Ganga Rejuvenation. The CWC is the national apex body for water resources development and management.

Question 42General Awareness and Current Affairs

Which of the following is a statutory body established to hear and decide water disputes between Indian states?

  1. Brahmaputra Board
  2. Central Ground Water Board
  3. National Water Development Agency
  4. Water Disputes Tribunal Correct answer.

Explanation

The Inter-State River Water Disputes Act, 1956 provides for the constitution of a Water Disputes Tribunal whenever a dispute over inter-state river waters cannot be settled by negotiation. The tribunal's award is binding on the states involved.

Question 43General Awareness and Current Affairs

The CWC's flood forecasting service issues advance warnings primarily for which purpose?

  1. Fixing minimum support prices for crops
  2. Setting reservoir power tariffs
  3. Allocating canal water among farmers
  4. Warning districts about rising river levels so that evacuation and relief can be organised Correct answer.

Explanation

The CWC operates a network of flood forecasting stations on major rivers and issues warnings when water levels cross prescribed danger marks. These warnings help district administrations move people and livestock to safety and prepare relief operations.

Question 44General Awareness and Current Affairs

In hydrology, the level of a river at which it begins to overflow its banks and threaten adjoining areas is termed the:

  1. Full supply level
  2. Sill level
  3. Dead storage level
  4. Danger level Correct answer.

Explanation

The danger level is the river stage at which further rise is likely to submerge low-lying areas and warrant flood warnings. The CWC fixes and publishes danger levels for its forecasting stations.

Question 45General Awareness and Current Affairs

Which river is the longest in India when measured within Indian territory?

  1. Ganga Correct answer.
  2. Godavari
  3. Brahmaputra
  4. Narmada

Explanation

The Ganga is the longest river flowing within India, covering roughly 2,525 km from the Gangotri glacier to its delta. The Brahmaputra is longer overall but runs mostly through Tibet and Bangladesh.

Question 46General Awareness and Current Affairs

A barrage across a river differs from a storage dam mainly because a barrage:

  1. Generates peaking power through a high head
  2. Diverts water through head regulators without creating significant storage Correct answer.
  3. Prevents all downstream flow during the monsoon
  4. Stores a huge volume of water for seasonal use

Explanation

A barrage raises the river level slightly so that water can be diverted into canals through head regulators, but it creates little storage. Dams, by contrast, impound large volumes to carry over seasonal demand.

Question 47General Awareness and Current Affairs

The Bhakra Nangal project is built on which river?

  1. Chenab
  2. Sutlej Correct answer.
  3. Beas
  4. Ravi

Explanation

The Bhakra dam and Nangal barrage are located on the Sutlej in Himachal Pradesh and Punjab. The project supplies irrigation and hydropower to Punjab, Haryana and Rajasthan.

Question 48General Awareness and Current Affairs

The 'Namami Gange' programme is chiefly aimed at:

  1. Interlinking the Ganga with the Yamuna
  2. Conserving and rejuvenating the Ganga through sewage treatment and riverfront works Correct answer.
  3. Dredging the Hooghly estuary for shipping
  4. Constructing new hydropower dams on the Ganga

Explanation

Namami Gange is an integrated conservation mission launched in 2014, focused on sewage interception and treatment, riverfront development, biodiversity and public awareness along the Ganga. It is implemented through the National Mission for Clean Ganga.

Question 49General Awareness and Current Affairs

Which of the following best describes 'e-flow' as used in Indian river regulation?

  1. The maximum flood discharge a dam spillway can pass
  2. The rate at which canal outlets release water to fields
  3. The volume lost to evaporation from a reservoir
  4. The discharge needed to keep a river's ecology functioning throughout the year Correct answer.

Explanation

Environmental flow (e-flow) is the quantity, timing and quality of water needed to sustain river ecosystems and the livelihoods dependent on them. The Ganga notification of 2018 prescribed minimum e-flows for the river at various points.

Question 50General Awareness and Current Affairs

India's National Water Policy, which guides water resource planning, has been revised in which year most recently?

  1. 2002
  2. 2015
  3. 2019
  4. 2012 Correct answer.

Explanation

The National Water Policy was first adopted in 1987, revised in 2002, and most recently revised in 2012. A draft update was circulated in 2020 but has not been formally adopted.