-
KSLC historical paper archive · Paper #124
The following sentence has been divided into four segments. Identify the segment that contains an error.
They have decided / to wind out / their business / without delay.
- They have decided
- their business
- to wind out
- without delay.
-
KSLC historical paper archive · Paper #124
Select the option that corrects the following sentence.
All the workers have called of the strike.
- All the workers have called at the strike.
- All the workers have called through the strike.
- All the workers have called between the strike.
- All the workers have called off the strike.
-
KSLC historical paper archive · Paper #124
The given sentence is divided into four segments. Select the option that has the segment with a grammatical error.
He organises / a children's fair every year / and his friends comes / to attend it.
- He organises
- a children's fair every year
- to attend it.
- and his friends comes
-
KSLC historical paper archive · Paper #124
The underlined phrase in the given sentence has been used incorrectly. Select the option that can correctly replace it.
Samita 'asked out' a favour of going early today.
- asked for
- asked over
- asked around
- asked after
-
KSLC historical paper archive · Paper #124
In the following passage some words have been deleted. Read the passage carefully and select the most appropriate option to fill in blank number 1.
(1)______ health benefits, including protection from cardiovascular disease and cancer, have been (2)_______ to antioxidants; however, according to dietitian Vinson, these benefits depend on how well antioxidants are absorbed and (3)______ by the body. According to the study, coffee has more antioxidant power than other well-known foods and drinks, like tea, milk, chocolate, and cranberries. Dates had the highest antioxidants per serving out of all the foods and drinks (4)_______, but because dates are not consumed to the same extent as coffee, the latter comes out on (5)_______, according to Vinson.
- Numerous
- Countable
- Limited
- Few
-
KSLC historical paper archive · Paper #124
In the following passage some words have been deleted. Read the passage carefully and select the most appropriate option to fill in blank number 2.
(1)______ health benefits, including protection from cardiovascular disease and cancer, have been (2)_______ to antioxidants; however, according to dietitian Vinson, these benefits depend on how well antioxidants are absorbed and (3)______ by the body. According to the study, coffee has more antioxidant power than other well-known foods and drinks, like tea, milk, chocolate, and cranberries. Dates had the highest antioxidants per serving out of all the foods and drinks (4)_______, but because dates are not consumed to the same extent as coffee, the latter comes out on (5)_______, according to Vinson.
- attributed
- negative
- similar
- parallel
-
KSLC historical paper archive · Paper #124
In the following passage some words have been deleted. Read the passage carefully and select the most appropriate option to fill in blank number 3.
(1)______ health benefits, including protection from cardiovascular disease and cancer, have been (2)_______ to antioxidants; however, according to dietitian Vinson, these benefits depend on how well antioxidants are absorbed and (3)______ by the body. According to the study, coffee has more antioxidant power than other well-known foods and drinks, like tea, milk, chocolate, and cranberries. Dates had the highest antioxidants per serving out of all the foods and drinks (4)_______, but because dates are not consumed to the same extent as coffee, the latter comes out on (5)_______, according to Vinson.
- utilised
- impede
- rejected
- hinder
-
KSLC historical paper archive · Paper #124
In the following passage some words have been deleted. Read the passage carefully and select the most appropriate option to fill in blank number 4.
(1)______ health benefits, including protection from cardiovascular disease and cancer, have been (2)_______ to antioxidants; however, according to dietitian Vinson, these benefits depend on how well antioxidants are absorbed and (3)______ by the body. According to the study, coffee has more antioxidant power than other well-known foods and drinks, like tea, milk, chocolate, and cranberries. Dates had the highest antioxidants per serving out of all the foods and drinks (4)_______, but because dates are not consumed to the same extent as coffee, the latter comes out on (5)_______, according to Vinson.
- assimilated
- analysed
- synthesised
- consumed
-
KSLC historical paper archive · Paper #124
Select the most appropriate synonym of the given word.
Competent
- Qualified
- Chatty
- Unskilled
- Dumb
-
KSLC historical paper archive · Paper #124
Select the most appropriate ANTONYM of the underlined word.
My parents have a 'fertile' land in the backyard.
- Barren
- Timid
- Scanty
- Potent
-
KSLC historical paper archive · Paper #124
Select the most appropriate meaning of the given idiom.
Dog eat dog
- Ruthlessly competitive
- Tit for tat
- Being calculative
- Like-minded people connect better
-
KSLC historical paper archive · Paper #124
Select the most appropriate connotation to fill in the blank.
I always love the ______ of my mother's cooking.
- aroma
- stench
- perfume
- scent
-
KSLC historical paper archive · Paper #124
Select the most appropriate ANTONYM of the given word.
Enemy
- Combatant
- Colleague
- Friend
- Attacker
-
KSLC historical paper archive · Paper #124
Select the correctly spelt word.
- Illuseon
- Illusion
- Illuzion
- Ilusion
-
KSLC historical paper archive · Paper #124
In the following passage some words have been deleted. Read the passage carefully and select the most appropriate option to fill in blank number 5.
(1)______ health benefits, including protection from cardiovascular disease and cancer, have been (2)_______ to antioxidants; however, according to dietitian Vinson, these benefits depend on how well antioxidants are absorbed and (3)______ by the body. According to the study, coffee has more antioxidant power than other well-known foods and drinks, like tea, milk, chocolate, and cranberries. Dates had the highest antioxidants per serving out of all the foods and drinks (4)_______, but because dates are not consumed to the same extent as coffee, the latter comes out on (5)_______, according to Vinson.
- bottom
- lowest
- below
- top
-
KSLC historical paper archive · Paper #124
Read the given sentence carefully. Change the meaning of the sentence by replacing the underlined word with its ANTONYM from the following options.
The 'equivocal' tone of the Prime Minister in his speech caused uproar in the chamber.
- conflicting
- iffy
- explicit
- irresolute
-
KSLC historical paper archive · Paper #124
Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select 'No substitution required'.
The plum tree in our garden 'is cover' in blossoms, as are the trees outside my office window.
- is covering at
- are cover at
- is covered in
- No substitution required
-
KSLC historical paper archive · Paper #124
Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select 'No substitution required'.
A soldier of the tenth legion leaped into the water as soon as 'the ship touches the shore'.
- No substitution required
- the ship touched the shore
- the ship was touch the shore
- the ship touch the shore
-
KSLC historical paper archive · Paper #124
Select the most appropriate option that can substitute the underlined segment in the given sentence.
We feel 'warm on' the subject.
- warmly about
- warming about
- warmer on
- warmed on
-
KSLC historical paper archive · Paper #124
Select the most appropriate meaning of the given idiom.
Put in mind
- To calculate
- To remind
- To forget
- To understand
-
KSLC historical paper archive · Paper #124
Select the most appropriate option that can substitute the underlined segment in the given sentence.
The dictator ordered the traitor 'were jailed'.
- is
- to be
- might
- was
-
KSLC historical paper archive · Paper #124
Select the INCORRECTLY spelt word.
- marijuena
- stationery
- dictator
- lascivious
-
KSLC historical paper archive · Paper #124
Select the most appropriate ANTONYM of the underlined word in the sentence.
He laboured very hard but could not yield anything from the 'barren' piece of land.
- Fertile
- Fruitless
- Vile
- Sterile
-
KSLC historical paper archive · Paper #124
Select the most appropriate ANTONYM of the underlined word in the given sentence.
The 'dearth' of governmental policies on the basic rights and comforts of the impaired population leads to low standard of public life in a country.
- Brevity
- Lacunae
- Abundance
- Paucity
-
KSLC historical paper archive · Paper #124
Select the most appropriate synonym of the given word.
Wonderful
- Upright
- Synthetic
- Amazing
- Awful
-
KSLC historical paper archive · Paper #124
5 is related to 27 by certain logic. Following the same logic, 7 is related to 51. To which of the following is 4 related, following the same logic?
NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into constituent digits.
- 15
- 64
- 18
- 37
-
KSLC historical paper archive · Paper #124
Which of the following numbers will replace the question mark (?) in the given series?
6, 16, 36, 76, ?, 316
- 152
- 146
- 156
- 168
-
KSLC historical paper archive · Paper #124
What will replace the question mark (?) if '+' and '-' are interchanged and '×' and '÷' are interchanged?
80 + 18 × 3 ÷ 5 - 23 = ?
- 73
- 85
- 88
- 80
-
KSLC historical paper archive · Paper #124
Three statements are followed by conclusions numbered I and II. Consider the statements to be true, even if they seem to be at variance with commonly known facts. Decide which conclusions logically follow.
Statements:
All journals are books.
Some books are fans.
All fans are wood.
Conclusion (I): Some journals are wood.
Conclusion (II): Some fans are books.
- Neither conclusion (I) nor (II) follows.
- Both conclusions (I) and (II) follow.
- Only conclusion (II) follows.
- Only conclusion (I) follows.
-
KSLC historical paper archive · Paper #124
The position of how many letters will remain unchanged if each of the letters in the word 'ABDUCTS' is arranged in English alphabetical order?
- More than four
- Three
- Four
- Two
-
KSLC historical paper archive · Paper #124
What should come in place of the question mark (?) in the given series?
131, 263, 527, 1055, ?
- 1121
- 2121
- 1211
- 2111
-
KSLC historical paper archive · Paper #124
What will replace the question mark (?) if '+' and '×' are interchanged and '-' and '÷' are interchanged?
132 - 12 × 17 + 3 ÷ 27 = ?
- 30
- 36
- 32
- 35
-
KSLC historical paper archive · Paper #124
Select the set in which the numbers are related in the same way as the numbers in the following sets.
(6, 12, 3)
(10, 20, 5)
NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits.
- (21, 28, 7)
- (14, 28, 7)
- (14, 21, 7)
- (14, 28, 9)
-
KSLC historical paper archive · Paper #124
'A × B' means 'A is B's brother'.
'A ÷ B' means 'A is B's sister'.
'A + B' means 'A is B's father'.
'A - B' means 'A is B's mother'.
Using the same meanings, which option means 'X is Z's mother's father'?
- X + Y - Z
- X - Y ÷ Z
- X + Y × Z
- X × Y ÷ Z
-
KSLC historical paper archive · Paper #124
Four letter-clusters are given, of which three are alike in some manner and one is different. Select the one that is different.
The odd one is not based on the number or position of consonants and vowels.
- PTV
- EJH
- XCA
- LQO
-
KSLC historical paper archive · Paper #124
What should come in place of the question mark (?) to complete the following letter-cluster series?
BDC, EGF, HJI, ?
- KLN
- LMN
- KML
- KLM
-
KSLC historical paper archive · Paper #124
What should come in place of the question mark (?) in the given series?
8, 21, 34, 47, 60, ?
- 71
- 72
- 73
- 70
-
KSLC historical paper archive · Paper #124
In a certain code language, 'art of war' is coded as 'gb pr ml' and 'the lost art' is coded as 'ml sj ak'. How is 'art' coded in that language?
- gb
- ml
- pr
- ak
-
KSLC historical paper archive · Paper #124
If 9 March 2007 was Friday, then what was the day of the week on 13 March 2012?
- Tuesday
- Thursday
- Monday
- Wednesday
-
KSLC historical paper archive · Paper #124
In a certain code language, 'MONEY' is coded as '64381' and 'HONEY' is coded as '54381'. What is the code for 'H'?
- 5
- 6
- 4
- 8
-
KSLC historical paper archive · Paper #124
Select the pair that follows the same pattern as both pairs below.
PTL : NRJ
AEX : YCV
- GIF : FIG
- BTM : DVO
- TVN : RTL
- ABC : ZTS
-
KSLC historical paper archive · Paper #124
Which two numbers should be interchanged to make the given equation correct?
45 ÷ 3 + 12 × 9 - 15 + 2 × 5 = 36
Numbers must be interchanged as whole numbers, not by exchanging constituent digits.
- 3 and 9
- 2 and 9
- 5 and 3
- 12 and 5
-
KSLC historical paper archive · Paper #124
Select the word-pair that best represents a similar relationship to the pair below.
Plain : Austere
The words must be meaningful English words; do not base the relation on letter counts.
- Clean : Sterile
- Lonely : Gloomy
- Neutral : Detached
- Abandon : Barren
-
KSLC historical paper archive · Paper #124
The ratio of a father's age to his son's age is 7 : 4. The product of the numbers representing their ages is 1372. What will be the ratio of their ages after 8 years?
- 19 : 11
- 19 : 12
- 19 : 13
- 19 : 14
-
KSLC historical paper archive · Paper #124
The following table shows the production of cars in a company from 2016 to 2020.
Years: 2016 | 2017 | 2018 | 2019 | 2020
A: 30 | 23 | 39 | 25 | 18
B: 16 | 10 | 14 | 12 | 8
C: 15 | 18 | 19 | 25 | 30
D: 31 | 12 | 21 | 19 | 20
There was a continuous decrease in production of which car types during 2018 to 2020?
- A, B
- C, D
- B, C
- B, D
-
KSLC historical paper archive · Paper #124
In triangle ABC, XY is drawn parallel to BC, cutting sides at X and Y, where AB = 5.4 cm, BC = 7.2 cm and BX = 3 cm. What is the length of XY (in cm)?
- 4.3
- 3.0
- 3.2
- 2.8
-
KSLC historical paper archive · Paper #124
Simplify: 18 ÷ (7 × 2 - 5) × 5 × 24 ÷ 30
- 8
- 0.5
- 10
- 6
-
KSLC historical paper archive · Paper #124
If the diameter of a hemisphere is 21 cm, what is its curved surface area (in cm²)? Take π = 22/7.
- 693
- 963
- 939
- 639
-
KSLC historical paper archive · Paper #124
The following data show the percentage distribution of workers by skill category in four companies.
Company | Skilled | Semi-skilled | Un-skilled
A | 30% | 40% | 30%
B | 25% | 30% | 45%
C | 40% | 40% | 20%
D | 40% | 25% | 35%
If all companies have the same total number of workers, which company has the highest number of un-skilled workers and which company has the lowest number of skilled workers, respectively?
- B; C
- B; B
- C; C
- C; B
-
KSLC historical paper archive · Paper #124
A boat can travel 60 km downstream in 4 hours. If the speed of the boat in still water is 13 km/h, in what time will it cover 30 km upstream?
- 2 8/11 hours
- 3 4/7 hours
- 2 4/7 hours
- 3 5/7 hours
-
KSLC historical paper archive · Paper #124
A dozen pairs of gloves priced at ₹180 are available at a discount of 10%. How many pairs of gloves can be bought for ₹54?
- 2
- 8
- 4
- 6
-
KSLC historical paper archive · Paper #124
During the first year, the population of a village increased by 5%, and during the second year it diminished by 5%. At the end of the second year its population was 47,880. What was the population at the beginning of the first year?
- 45000
- 48000
- 43500
- 53000
-
KSLC historical paper archive · Paper #124
How many numbers lie strictly between 2000 and 2020 that are divisible by 8?
- 2
- 5
- 3
- 4
-
KSLC historical paper archive · Paper #124
Mahesh's annual salary increased from ₹2,00,000 to ₹2,40,000. Find the percentage increase in the salary.
- 22%
- 18%
- 24%
- 20%
-
KSLC historical paper archive · Paper #124
Twelve men working for 9 hours a day complete a piece of work in 24 days. In how many days can 8 men working for 12 hours a day complete the same piece of work?
- 27 days
- 28 days
- 21 days
- 24 days
-
KSLC historical paper archive · Paper #124
The perimeter of a minor sector of a circle of radius 4 units, subtending an angle of 45°, is:
- 4 - π units
- 8 - π units
- 8 + π units
- 4 + π units
-
KSLC historical paper archive · Paper #124
The areas of two similar triangles ΔPQR and ΔXYZ are 12.96 cm² and 635.04 cm², respectively. If QR = 2.9 cm, then the length of YZ (in cm) equals:
- 30.4
- 20.3
- 23.2
- 25.2
-
KSLC historical paper archive · Paper #124
The following data show marks obtained by Riya and Rida in six CBSE Class 12 subjects. The maximum marks in Maths, Physics and Chemistry are 140 each, while the maximum marks in English, IP and Biology are 180 each.
Subject | Riya | Rida
Maths | 80 | 70
Physics | 100 | 110
Chemistry | 130 | 120
English | 110 | 140
IP | 150 | 130
Biology | 170 | 160
What percentage marks did Rida obtain in PCM (Maths, Physics and Chemistry)?
- 81.32%
- 50%
- 71.43%
- 78.57%
-
KSLC historical paper archive · Paper #124
The following data show exports of pearls (in crores of rupees).
Year | Export
2013 | 9.9
2014 | 10.8
2015 | 7.8
2016 | 5.2
2017 | 6.5
2018 | 9.5
2019 | 11.4
In which year was the percentage increase in exports over the previous year the greatest?
- 2018
- 2014
- 2017
- 2019
-
KSLC historical paper archive · Paper #124
In a group of 250 persons, 40% are males and 60% are females. If 30 more females join the group, what will be the percentage of females in the new group? Give the answer correct to two decimal places.
- 62.58%
- 72.25%
- 64.29%
- 90.25%
-
KSLC historical paper archive · Paper #124
What is the value of cos(x + y) - sin(x - y) + tan(2z)?
- cos x cos y - sin x sin y - sin x cos y - cos x sin y + 2 tan z/(1 - tan² z)
- cos x cos y - sin x sin y - sin x cos y + cos x sin y + 2 tan z/(1 - tan² z)
- cos x cos y - sin x sin y - cos x sin y + tan z/(1 - tan² z)
- sin x sin y + 2 tan z/(1 - tan² z)
-
KSLC historical paper archive · Paper #124
A merchant sold two refrigerators for ₹10,000 each. On one refrigerator, he incurred a 20% loss, and on the other, he gained 20%. What was his profit or loss percentage on the whole transaction?
- Profit of 4%
- Loss of 2%
- Loss of 4%
- Profit of 2%
-
KSLC historical paper archive · Paper #124
O is the centre of a circle and the arc PQR subtends an angle of 240° at O. PQ is extended to A. Then ∠AQR is:
- 180°
- 60°
- 240°
- 120°
-
KSLC historical paper archive · Paper #124
The graphs of the two linear equations x + 2y = 15 and 4x + 8y = 13 will be:
- parallel
- coincident
- intersecting at one point
- intersecting at two points
-
KSLC historical paper archive · Paper #124
The capacity of a cylindrical tank is 8316 cm³. If the radius of its base is 21 cm, find the depth of the tank. Take π = 22/7.
- 4 cm
- 8 cm
- 10 cm
- 6 cm
-
KSLC historical paper archive · Paper #124
On which river in India was the Somasila Dam built?
- Krishna River
- Pennar River
- Sabarmati River
- Tapti River
-
KSLC historical paper archive · Paper #124
Which theory describes the collective effects of changes in Earth's movements on its climate over thousands of years?
- Plate tectonics theory
- Copernicus' heliocentric theory
- Milankovitch theory
- Continental drift theory
-
KSLC historical paper archive · Paper #124
How many times had India won the South Asian Football Federation (SAFF) Championship as of December 2023?
- 5 times
- 7 times
- 6 times
- 9 times
-
KSLC historical paper archive · Paper #124
How much water should be added to 60 litres of milk priced at 1 1/2 litres per rupee so as to obtain a mixture worth 1 7/8 litres per rupee?
- 15 litres
- 12 litres
- 27 litres
- 20 litres
-
KSLC historical paper archive · Paper #124
Two circles touch each other externally. Their centres are O and A, their radii are 49 cm and 16 cm, and BC is a direct common tangent segment joining their respective points of tangency. Find the length (in cm) of BC.
- 56
- 55
- 58
- 57
-
KSLC historical paper archive · Paper #124
Which of the following types of crops are sown after the end of the monsoon season?
- Zaid crops
- Kharif crops
- Rabi crops
- Vital crops
-
KSLC historical paper archive · Paper #124
By which ministry of the Government of India was the Deendayal Antyodaya Yojana started?
- Ministry of Rural Development
- Ministry of Home Affairs
- Ministry of Labour and Employment
- Ministry of Corporate Affairs
-
KSLC historical paper archive · Paper #124
How many types of writs can be issued by the Supreme Court to protect the Fundamental Rights of Indian citizens?
- Six
- Four
- Five
- Seven
-
KSLC historical paper archive · Paper #124
What is the name of the centrally sponsored literacy scheme launched by the Government of India in March 2023?
- National Literacy Programme
- New India Literacy Programme
- India Literacy Programme
- Bharat Padhega
-
KSLC historical paper archive · Paper #124
Match the musical instruments with the maestros who play them.
a. Santoor
b. Sitar
c. Shehnai
d. Sarangi
i. Bismillah Khan
ii. Ustad Binda Khan
iii. Pt Shiv Kumar Sharma
iv. Anoushka Shankar
- a-iv, b-iii, c-ii, d-i
- a-i, b-ii, c-iii, d-iv
- a-ii, b-iii, c-i, d-iv
- a-iii, b-iv, c-i, d-ii
-
KSLC historical paper archive · Paper #124
In 2023, Gulab Chand Kataria became the Governor of which state?
- Himachal Pradesh
- Tamil Nadu
- Odisha
- Assam
-
KSLC historical paper archive · Paper #124
Match List I (composition) with List II (writer).
1. Vande Mataram
2. Jana Gana Mana
3. Ae Mere Watan Ke Logon
A. Pradeep
B. Bankim Chandra Chattopadhyay
C. Rabindranath Tagore
- 1-C, 2-B, 3-A
- 1-C, 2-A, 3-B
- 1-A, 2-B, 3-C
- 1-B, 2-C, 3-A
-
KSLC historical paper archive · Paper #124
As per Olympic badminton rules, in the third game players change ends when a side first scores how many points?
- 11
- 13
- 15
- 12
-
KSLC historical paper archive · Paper #124
The loss of water in the form of water droplets from the leaves of plants is called ____.
- Pressure gradient
- Guttation
- Translocation
- Plasmolysis
-
KSLC historical paper archive · Paper #124
A ____ is a cloud of dust and gas inside a galaxy.
- photosphere
- black hole
- chromosphere
- nebula
-
KSLC historical paper archive · Paper #124
Who among the following was appointed to the UN tax committee in July 2021 as a member for the 2021 to 2025 term?
- Vivek Singh
- Vipul Bansal
- Rasmi Ranjan Das
- T V Somanathan
-
KSLC historical paper archive · Paper #124
Who is regarded as the founder of modern microfinance?
- V K V Rao
- Rangarajan
- Y V Reddy
- Muhammad Yunus
-
KSLC historical paper archive · Paper #124
P. C. Mahalanobis is remembered as a major contributor to India's developmental path because he _____.
(A) set up Indian Institutes of Management in different parts of India
(B) formulated the Second Five-Year Plan
(C) was the first Minister of Statistics and Programme Implementation
- Only (A) and (C) are true
- Only (A) and (B) are true
- Only (A) is true
- Only (B) is true
-
KSLC historical paper archive · Paper #124
Who among the following was primarily an integral part of the Indian National Army (INA)?
- Rabindranath Tagore
- Chittaranjan Das
- Abanindranath Tagore
- Subhas Chandra Bose
-
KSLC historical paper archive · Paper #124
Which clause of Article 20 of the Constitution of India incorporates the doctrine of double jeopardy?
- 1
- 4
- 3
- 2
-
KSLC historical paper archive · Paper #124
According to the Census of India 2011, which state had the largest gap between male and female literacy rates among the following?
- Assam
- Rajasthan
- Karnataka
- Andhra Pradesh
-
KSLC historical paper archive · Paper #124
Which of the following was the last dynasty of the Vijayanagara Empire?
- Aravidu dynasty
- Sangam dynasty
- Saluva dynasty
- Tuluva dynasty
-
KSLC historical paper archive · Paper #124
In MS Word, which feature allows you to create different headers and footers for odd and even pages in a document?
- Different First Page
- Page Breaks
- Different Odd & Even Pages
- Section Breaks
-
KSLC historical paper archive · Paper #124
____ is a significant festival of the Parsi people who practise Zoroastrianism, marking the birth anniversary of Zoroaster.
- Jamshed-e-Navroz
- Pateti
- Khordad Sal
- Gahambars
-
KSLC historical paper archive · Paper #124
Who among the following is a famous Indian classical dancer?
- Sonal Mansingh
- Asha Bhosle
- Pratibha Ray
- S. Janaki
-
KSLC historical paper archive · Paper #124
In which year was tennis first included in the Olympic Games?
- 1948
- 1935
- 1896
- 1927
-
KSLC historical paper archive · Paper #124
Which kind of computer security requires verifying the genuineness of the individuals or organisations that want to access a system?
- Non-repudiation
- Availability
- Authentication
- Confidentiality