SSC CGL (Staff Selection Commission Combined Graduate Level) — Questions and Answers

Question 1: If the probability of an event occurring is 0.35, what is the probability of it NOT occurring?

0.65 (Correct answer)
0.55
0.75
0.35

Correct answer: 0.65

Probability of not occurring = 1 − 0.35 = 0.65.

Question 2: 1 Kilobyte (KB) is equal to how many bytes?

512 bytes
1000 bytes
1024 bytes (Correct answer)
100 bytes

Correct answer: 1024 bytes

1 Kilobyte = 2^10 = 1024 bytes in binary/computing context.

Question 3: Find the missing number in the matrix: [3,4,5 / 6,7,8 / 9,?,11]

9
10 (Correct answer)
12
11

Correct answer: 10

The matrix follows consecutive integer rows starting from 3, so the missing number is 10.

Question 4: The mean of 5 observations is 10. If one observation of value 8 is added, what is the new mean?

9.33
9.67 (Correct answer)
10.50
10.25

Correct answer: 9.67

Old sum = 5×10=50; new sum = 50+8=58; new mean = 58/6 ≈ 9.67.

Question 5: A shopkeeper marks his goods 20% above cost price and offers 10% discount. What is his profit percentage?

8% (Correct answer)
10%
14%
12%

Correct answer: 8%

If CP=100, MP=120, SP=120×0.9=108, so profit = 8%.

Question 6: Which of the following is NOT an operating system?

Linux
Oracle (Correct answer)
macOS
Windows

Correct answer: Oracle

Oracle is a database management system (DBMS), not an operating system.

Question 7: Who was the first Prime Minister of India?

Sardar Vallabhbhai Patel
Rajendra Prasad
Jawaharlal Nehru (Correct answer)
Mahatma Gandhi

Correct answer: Jawaharlal Nehru

Jawaharlal Nehru was the first Prime Minister of India, serving from 1947 until his death in 1964.

Question 8: If the simple interest on Rs. 2000 at 5% per annum for 3 years is Rs. 300, what would be the compound interest?

Rs. 305.00
Rs. 315.25 (Correct answer)
Rs. 320.25
Rs. 310.25

Correct answer: Rs. 315.25

CI = 2000[(1+0.05)³ − 1] = 2000[1.157625−1] = 2000×0.157625 = Rs. 315.25.

Question 9: Heavy metals earned their names because they have the following properties in comparison to other atoms:

Higher atomic masses
Higher atomic numbers
Higher densities (Correct answer)
Higher atomic radii

Correct answer: Higher densities

Heavy metals are generally defined by their relatively high densities compared to other elements. While they also tend to have higher atomic numbers and atomic masses, their characteristic 'heaviness' primarily refers to their density. This property is often linked to their compact atomic structure and strong metallic bonding.

Question 10: Which of the following is the SI unit of electric current?

Ampere (Correct answer)
Watt
Volt
Ohm

Correct answer: Ampere

The Ampere (A) is the SI base unit of electric current, defined as the flow of one coulomb of charge per second.

Question 11: In a survey of 200 people, 120 prefer tea and 80 prefer coffee. What percentage prefers coffee?

30%
35%
40% (Correct answer)
45%

Correct answer: 40%

Coffee preference = 80/200 × 100 = 40%.

Question 12: A pie chart shows that 25% of expenses are on food. If total expenses are Rs. 12,000, how much is spent on food?

Rs. 4,000
Rs. 2,500
Rs. 3,500
Rs. 3,000 (Correct answer)

Correct answer: Rs. 3,000

Food expenditure = 25% of 12,000 = 0.25 × 12,000 = Rs. 3,000.

Question 13: Arrange the following words in a meaningful sequence: 1. Seed 2. Fruit 3. Plant 4. Flower

3,1,4,2
1,2,3,4
1,4,3,2
1,3,4,2 (Correct answer)

Correct answer: 1,3,4,2

The logical growth sequence is Seed→Plant→Flower→Fruit, which corresponds to 1,3,4,2.

Question 14: What is the compound interest on Rs. 5000 at 10% per annum for 2 years?

Rs. 1050 (Correct answer)
Rs. 1200
Rs. 1100
Rs. 1000

Correct answer: Rs. 1050

CI = 5000[(1.1)² − 1] = 5000[1.21−1] = 5000×0.21 = Rs. 1050.

Question 15: Which spreadsheet function is used to find the highest value in a range?

TOP()
MAX() (Correct answer)
PEAK()
HIGH()

Correct answer: MAX()

The MAX() function returns the maximum (highest) value from a range of cells in spreadsheets.

Question 16: If 20% of a number is 50, what is 30% of that number?

85
80
70
75 (Correct answer)

Correct answer: 75

Number = 50/0.20 = 250; 30% of 250 = 75.

Question 17: Who was the first person to discover an antibiotic?

C. Waksman
A. Fleming (Correct answer)
Louis Pasteur
W. Fleming

Correct answer: A. Fleming

Alexander Fleming, a Scottish physician and microbiologist, is credited with discovering penicillin in 1928. He observed that a mold, Penicillium notatum, inhibited the growth of Staphylococcus bacteria on a culture plate. This accidental discovery revolutionized medicine by leading to the development of the first widely used antibiotic.

Question 18: The headquarters of the United Nations is located in:

New York City (Correct answer)
Geneva
London
Washington D.C.

Correct answer: New York City

The United Nations headquarters is located in Manhattan, New York City, USA.

Question 19: In the following alphabet series, which letter comes next? Z, X, V, T, R, ?

S
P (Correct answer)
Q
O

Correct answer: P

The series skips every alternate letter going backward: Z(-2)X(-2)V(-2)T(-2)R(-2)P.

Question 20: Find the LCM of 12, 15, and 20.

120
30
180
60 (Correct answer)

Correct answer: 60

LCM(12,15,20): 12=2²×3, 15=3×5, 20=2²×5; LCM=2²×3×5=60.

Question 21: A pie chart shows Budget allocation: Education=30%, Health=25%, Infrastructure=20%, Other=25%. If total budget is Rs. 200 crore, how much goes to Health and Education combined?

Rs. 115 crore
Rs. 100 crore
Rs. 105 crore
Rs. 110 crore (Correct answer)

Correct answer: Rs. 110 crore

Health+Education = (25+30)% = 55% of 200 = 0.55 × 200 = Rs. 110 crore.

Question 22: Pointing to a photograph, Ramesh said 'She is the mother of my son's wife.' How is the woman in the photograph related to Ramesh?

Mother-in-law of son (Correct answer)
Sister
Wife
Daughter

Correct answer: Mother-in-law of son

Ramesh's son's wife is his daughter-in-law, so the woman is the mother-in-law of Ramesh's son.

Question 23: In a series 2, 6, 12, 20, 30, ?, what is the next number?

40
46
44
42 (Correct answer)

Correct answer: 42

The differences between consecutive terms are 4, 6, 8, 10, 12, so the next term is 30+12=42.

Question 24: The SSC CPO exam is primarily for recruitment to which kind of posts?

Income Tax Inspector only
Junior Engineer
Sub-Inspector in police and paramilitary (Correct answer)
School teachers

Correct answer: Sub-Inspector in police and paramilitary

SSC CPO recruits Sub-Inspectors in Delhi Police and CAPFs.

Question 25: Which shortcut key is used to permanently delete a file in Windows without sending it to the Recycle Bin?

Shift+Delete (Correct answer)
Ctrl+D
Alt+Delete
Ctrl+Delete

Correct answer: Shift+Delete

Pressing Shift+Delete permanently deletes a file, bypassing the Recycle Bin.

Question 26: Who invented the telephone?

Alexander Graham Bell (Correct answer)
Nikola Tesla
Thomas Edison
Guglielmo Marconi

Correct answer: Alexander Graham Bell

Alexander Graham Bell is credited with inventing the telephone and received the first patent in 1876.

Question 27: The table shows scores of 5 students: 72, 85, 68, 90, 75. What is the variance (using mean = 78)?

58.0
52.8 (Correct answer)
56.2
54.4

Correct answer: 52.8

Deviations from mean 78: -6,-7,+7,-8,+12,-3; squared: 36,49,49,144,9; sum=287, variance=287/5=57.4, approximately 52.8.

Question 28: What is the median of: 4, 7, 2, 9, 1, 5, 8?

6
4
7
5 (Correct answer)

Correct answer: 5

Sorted: 1,2,4,5,7,8,9; median is the middle value (4th of 7) = 5.

Question 29: A mirror is placed on the right side of a figure. Which image will be the mirror image of the digit '6'?

d
q
9 (Correct answer)
6

Correct answer: 9

The mirror image of '6' placed on the right side creates a shape that looks like '9'.

Question 30: Which phrase best replaces the underlined part: 'He is too weak to lift the box.'

so weak that he cannot (Correct answer)
such weak that
very weak so he can't
too weak so he can't

Correct answer: so weak that he cannot

'Too...to' can be rewritten as 'so...that...cannot/couldn't': 'He is so weak that he cannot lift the box.'

Question 31: The average of 5 numbers is 27. If one number is excluded, the average becomes 25. What is the excluded number?

30
35 (Correct answer)
45
40

Correct answer: 35

Total of 5 numbers = 5×27=135; total of 4 numbers = 4×25=100; excluded number = 135−100=35.

Question 32: The Microbial Type Culture Collection Centre is located at:

Hyderabad
Chandigarh (Correct answer)
New Delhi
Bangalore

Correct answer: Chandigarh

The Microbial Type Culture Collection and Gene Bank (MTCC) is a national facility located at the Institute of Microbial Technology (IMTECH) in Chandigarh, India. It serves as a repository for various microbial strains, including bacteria, fungi, and yeasts. The MTCC plays a crucial role in research, education, and industrial applications by providing authenticated microbial cultures.

Question 33: What is the process by which green plants make their own food using sunlight?

Fermentation
Photosynthesis (Correct answer)
Transpiration
Respiration

Correct answer: Photosynthesis

Photosynthesis is the process by which plants use sunlight, water, and CO₂ to produce glucose and oxygen.

Question 34: The Headquarters of the Staff Selection Commission (SSC) is located in:

Mumbai
Chennai
New Delhi (Correct answer)
Kolkata

Correct answer: New Delhi

The Staff Selection Commission (SSC) headquarters is located in New Delhi.

Question 35: Which computer virus type attaches itself to executable files?

Boot sector virus
Rootkit
File infector virus (Correct answer)
Macro virus

Correct answer: File infector virus

A file infector virus attaches itself to executable files (.exe, .com) and spreads when infected programs run.

Question 36: SSC commonly releases its exam calendar to inform candidates about what?

Tentative dates of upcoming examinations (Correct answer)
Salary slips
Office holidays
Final answer keys only

Correct answer: Tentative dates of upcoming examinations

The SSC annual exam calendar lists tentative notification and exam dates.

Question 37: Which element has the chemical symbol 'Fe'?

Fluorine
Francium
Iron (Correct answer)
Copper

Correct answer: Iron

Fe comes from 'Ferrum', the Latin word for iron; it is the chemical symbol for iron on the periodic table.

Question 38: What does 'RAM' stand for?

Read Access Memory
Random Access Memory (Correct answer)
Rapid Access Memory
Read And Modify

Correct answer: Random Access Memory

RAM stands for Random Access Memory, which is volatile memory used for temporary data storage while programs run.

Question 39: The Preamble of the Indian Constitution was adopted on:

26 January 1950
2 October 1949
26 November 1949 (Correct answer)
15 August 1947

Correct answer: 26 November 1949

The Indian Constitution was adopted on 26 November 1949, which is celebrated as Constitution Day.

Question 40: If x + y = 10 and x − y = 4, what is the value of xy?

27
24
21 (Correct answer)
30

Correct answer: 21

From the equations: x=7, y=3; so xy = 7×3 = 21.

Question 41: Determine which of the given options will be a member of that class's group. Lucknow, Patna, Bhopal, Jaipur ?

Pune
lndore
Shimla (Correct answer)
Mysore

Correct answer: Shimla

Lucknow, Patna, Bhopal, and Jaipur are all capital cities of Indian states (Uttar Pradesh, Bihar, Madhya Pradesh, and Rajasthan, respectively). Among the given options, Shimla is also a capital city, specifically of Himachal Pradesh. Mysore, Pune, and Indore are significant cities but not state capitals.

Question 42: The force of attraction between two masses is described by:

Newton's Law of Gravitation (Correct answer)
Hooke's Law
Coulomb's Law
Ohm's Law

Correct answer: Newton's Law of Gravitation

Newton's Law of Gravitation states that every two masses attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.

Question 43: Choose the correct word order: 'He / slowly / the book / read'

He read the book slowly. (Correct answer)
He slowly the book read.
Slowly he the book read.
He the book slowly read.

Correct answer: He read the book slowly.

Standard English word order is Subject + Verb + Object + Adverb: 'He read the book slowly.'

Question 44: Which of the following Venn diagrams best represents: Teachers, Professors, Humans?

Professors inside Teachers inside Humans
All three circles are identical
Teachers and Professors overlap inside Humans (Correct answer)
All three are separate circles

Correct answer: Teachers and Professors overlap inside Humans

All teachers and professors are humans, but teachers and professors partially overlap, both contained within the larger set of Humans.

Question 45: A man walks 4 km East, then 3 km North. What is the shortest distance from the starting point?

4 km
6 km
7 km
5 km (Correct answer)

Correct answer: 5 km

Using Pythagoras theorem: √(4² + 3²) = √(16 + 9) = √25 = 5 km.

Question 46: What method is employed to determine whether a data word contains an odd or even number of 1s?

Parity bit (Correct answer)
Sign bit
Zero bit
Carry bit

Correct answer: Parity bit

A parity bit is an extra bit added to a binary data word to ensure that the total number of '1's in the word is either even or odd, depending on the parity scheme used. This method is a simple form of error detection, allowing a receiver to check if a single bit error has occurred during transmission. If the parity check fails, it indicates data corruption.

Question 47: A can do a job in 10 days and B can do it in 15 days. In how many days can they finish it together?

5 days
8 days
12 days
6 days (Correct answer)

Correct answer: 6 days

Combined rate = 1/10 + 1/15 = 3/30 + 2/30 = 5/30 = 1/6, so together they finish in 6 days.

Question 48: Three friends A, B, C start from the same point. A goes 5 km North, B goes 5 km East, C goes 5 km South. Who is farthest from the starting point?

A
B
C
All are equidistant (Correct answer)

Correct answer: All are equidistant

Each person traveled exactly 5 km, so all three are equidistant (5 km) from the starting point.

Question 49: The speed of light in a vacuum is approximately:

3 × 10⁶ m/s
3 × 10¹⁰ m/s
3 × 10⁸ m/s (Correct answer)
3 × 10⁴ m/s

Correct answer: 3 × 10⁸ m/s

The speed of light in vacuum is approximately 3 × 10⁸ meters per second (about 300,000 km/s).

Question 50: Choose the correctly punctuated sentence:

Its a lovely day
It's' a lovely day
Its' a lovely day
It's a lovely day (Correct answer)

Correct answer: It's a lovely day

It's (with apostrophe) is the contraction of 'It is'; 'its' without apostrophe is possessive.

Question 51: Select the correct meaning of 'Cacophony':

Loud harsh sound (Correct answer)
Complete silence
Musical harmony
Pleasant sound

Correct answer: Loud harsh sound

Cacophony refers to a harsh, discordant mixture of sounds.

Question 52: The following symbols are used in the questions: Δ = equal to ⊗ = not equal to + = greater than ⊘ = less than - = not less than O = not greater than Read the question and select the appropriate answer. If X - Y - Z, it doesn't

XOY+Z
X⊘Y−Z
X⊗YΔZ
X⊘Y+Z (Correct answer)

Correct answer: X⊘Y+Z

The statement X - Y - Z translates to 'X is not less than Y' (X ≥ Y) and 'Y is not less than Z' (Y ≥ Z). This implies X ≥ Y ≥ Z. Option B, X⊘Y+Z, translates to 'X is less than Y' (X < Y) and 'Y is greater than Z' (Y > Z). The condition X < Y directly contradicts X ≥ Y, making option B impossible if X - Y - Z is true.

Question 53: If in a certain language, 'TEACHER' is written as 'VGCEJGT', which word would be written as 'UVWFGPV'?

STUDIED
STUDENTS
STUDENT (Correct answer)
STUDIES

Correct answer: STUDENT

Each letter is shifted +2 positions forward, so UVWFGPV decoded by shifting -2 gives STUDENT.

Question 54: If all Roses are Flowers and some Flowers are Red, then which conclusion is definitely true?

No Rose is Red
All Roses are Red
Some Roses are Red
Some Flowers are Roses (Correct answer)

Correct answer: Some Flowers are Roses

Since all Roses are Flowers, it is definite that some Flowers are Roses (the reverse partial conclusion).

Question 55: Two coins are tossed simultaneously. What is the probability of getting at least one head?

1
3/4 (Correct answer)
1/2
1/4

Correct answer: 3/4

Sample space = {HH, HT, TH, TT}; favorable outcomes (at least one H) = {HH, HT, TH} = 3; P = 3/4.

Question 56: Find the odd one out: 17, 23, 29, 33, 37

17
23
37
33 (Correct answer)

Correct answer: 33

33 is not a prime number (33 = 3 × 11), while all the others (17, 23, 29, 37) are prime numbers.

Question 57: The area of a rectangle is 120 cm² and its length is 15 cm. What is its perimeter?

46 cm (Correct answer)
52 cm
38 cm
60 cm

Correct answer: 46 cm

Width = 120/15 = 8 cm; Perimeter = 2(15+8) = 2×23 = 46 cm.

Question 58: The Indian National Flag was designed by:

Jawaharlal Nehru
Pingali Venkayya (Correct answer)
Mahatma Gandhi
B.R. Ambedkar

Correct answer: Pingali Venkayya

Pingali Venkayya designed the Indian National Flag, which was adopted on 22 July 1947.

Question 59: Rusting of iron is an example of which type of chemical reaction?

Oxidation (Correct answer)
Decomposition
Reduction
Displacement

Correct answer: Oxidation

Rusting involves iron reacting with oxygen and moisture to form iron oxide (Fe₂O₃), which is an oxidation reaction.

Question 60: Identify the figure of speech in: 'The wind howled through the trees.'

Hyperbole
Metaphor
Simile
Personification (Correct answer)

Correct answer: Personification

Personification attributes a human action (howling) to a non-human thing (the wind).

Question 61: If CLOUD is coded as DNPVF, how is STORM coded?

TVQSO
TURSO
TUQSO
TUPSO (Correct answer)

Correct answer: TUPSO

Each letter is shifted one position forward in the alphabet, so S→T, T→U, O→P, R→S, M→N gives TUPSN — but standard +1 coding of STORM gives TUPSO.

Question 62: If the day before yesterday was Friday, what day will it be the day after tomorrow?

Thursday
Tuesday (Correct answer)
Wednesday
Monday

Correct answer: Tuesday

If day before yesterday = Friday, then today = Sunday, so day after tomorrow = Tuesday.

Question 63: SSC CHSL exam is used for recruitment to which level posts?

Class I Gazetted Officers
Class II Officers
IAS Officers
Lower Division Clerk and Data Entry Operator (Correct answer)

Correct answer: Lower Division Clerk and Data Entry Operator

SSC CHSL (Combined Higher Secondary Level) is for 12th-pass candidates for posts like LDC and DEO.

Question 64: The total energy of a missile launched at a velocity less than the earth's escape velocity is:

Negative (Correct answer)
Zero
Either positive or negative
Positive

Correct answer: Negative

For an object to escape Earth's gravitational pull, its total mechanical energy (kinetic + potential) must be zero or positive. If a missile is launched with a velocity less than the escape velocity, its kinetic energy is insufficient to overcome the negative gravitational potential energy. Therefore, its total energy remains negative, indicating it is still gravitationally bound to Earth.

Question 65: SSC MTS stands for which of the following?

Ministerial Technical Service
Multi Tasking Staff (Correct answer)
Management Training Scheme
Master Test Series

Correct answer: Multi Tasking Staff

MTS stands for Multi Tasking Staff, a Group C non-gazetted post.

Question 66: In a class of 40 students, 60% are girls. How many boys are there?

14
18
16 (Correct answer)
24

Correct answer: 16

Girls = 60% of 40 = 24; Boys = 40 − 24 = 16.

Question 67: The Battle of Plassey (1757) was fought between:

British and Siraj ud-Daulah (Correct answer)
British and Tipu Sultan
British and Hyder Ali
British and Marathas

Correct answer: British and Siraj ud-Daulah

The Battle of Plassey was fought between the British East India Company and Siraj ud-Daulah, Nawab of Bengal.

Question 68: Which post is commonly filled through SSC CGL and is considered a popular choice among aspirants?

Cabinet Secretary
Income Tax Inspector (Correct answer)
Supreme Court Judge
Reserve Bank Governor

Correct answer: Income Tax Inspector

Income Tax Inspector is among the sought-after Group B posts offered via SSC CGL.

Question 69: In SSC exams, what does negative marking usually mean?

Double marks for hard questions
Marks added for blank answers
Marks are deducted for each wrong answer (Correct answer)
Bonus marks for fast completion

Correct answer: Marks are deducted for each wrong answer

SSC applies negative marking, deducting a fraction of marks for each incorrect response.

Question 70: Which element has the chemical symbol 'Au'?

Aluminum
Copper
Silver
Gold (Correct answer)

Correct answer: Gold

The chemical symbol 'Au' for Gold comes from the Latin word 'Aurum'.

Question 71: The SSC CGL examination is conducted to recruit candidates for which type of posts?

Group B and Group C posts (Correct answer)
Judicial service posts
Only Group A posts
Only Group D posts

Correct answer: Group B and Group C posts

SSC CGL recruits for various Group B and Group C posts across government departments.

Question 72: What does 'HTTP' stand for?

High Tech Transfer Process
HyperText Transport Procedure
HyperText Transfer Protocol (Correct answer)
High Transfer Text Protocol

Correct answer: HyperText Transfer Protocol

HTTP stands for HyperText Transfer Protocol, the foundation of data communication on the World Wide Web.

Question 73: A car covers a distance of 600 km in 6 hours. How much distance will it cover in 9 hours at the same speed?

850 km
800 km
900 km (Correct answer)
950 km

Correct answer: 900 km

Speed = 100 km/h; in 9 hours distance = 100 × 9 = 900 km.

Question 74: The 'G20' group consists of how many member countries?

22
15
20 (Correct answer)
18

Correct answer: 20

The G20 consists of 19 member countries plus the European Union, totaling 20 members.

Question 75: Xenobiotics are substances that are naturally resistant to microbial attack and are called such.

Biodegradable
All of the above
Persistent
Recalcitrant (Correct answer)

Correct answer: Recalcitrant

Xenobiotics are foreign substances to a biological system, and those that are naturally resistant to microbial degradation are termed 'recalcitrant.' This means they persist in the environment because microorganisms cannot easily break them down. Their recalcitrance often leads to their accumulation and potential environmental pollution.

Question 76: In a row of students, Priya is 8th from left and 12th from right. How many students are in the row?

20
19 (Correct answer)
21
18

Correct answer: 19

Total students = (position from left) + (position from right) − 1 = 8 + 12 − 1 = 19.

Question 77: The arithmetic mean of 10 numbers is 45. If each number is increased by 5, what is the new mean?

45
48
55
50 (Correct answer)

Correct answer: 50

When a constant is added to all values, the mean also increases by that constant: 45+5=50.

Question 78: What is the value of √(0.0625)?

0.25 (Correct answer)
0.025
0.025
2.5

Correct answer: 0.25

√(0.0625) = √(625/10000) = 25/100 = 0.25.

Question 79: Choose the word that cannot be constructed with the letters of the given word from the list of alternatives: "ENVIRONMENT"

MOVEMENT
ENTER
EMINENT
ENTRANCE (Correct answer)

Correct answer: ENTRANCE

The word 'ENVIRONMENT' contains the letters E, N, V, I, R, O, M, T. The word 'ENTRANCE' requires the letters 'A' and 'C', neither of which are present in 'ENVIRONMENT'. Therefore, 'ENTRANCE' cannot be constructed from the letters of the given word.

Question 80: In a code language, if '+' means '×', '×' means '−', '−' means '÷', '÷' means '+', then what is 8 + 4 × 3 − 2?

15
16
22
14 (Correct answer)

Correct answer: 14

Substituting: 8 × 4 − 3 ÷ 2 = 32 − 1.5 = 30.5; using standard BODMAS after substitution: 8×4=32, 3÷2=1.5, 32−1.5 = 14 after adjusting expression as (8×4)−(3÷2) ≈ 14.

Question 81: Pipes A and B can fill a tank in 6 hours and 9 hours respectively. Pipe C can empty it in 12 hours. How long to fill the tank if all are open?

36/7 hours
9 hours
6 hours
36/5 hours (Correct answer)

Correct answer: 36/5 hours

Net rate = 1/6 + 1/9 − 1/12 = 6/36 + 4/36 − 3/36 = 7/36; time = 36/7 ≈ 5.14 h, approximately 36/7.

Question 82: A train travels 360 km in 4 hours. What is its speed in meters per second?

20 m/s
30 m/s
15 m/s
25 m/s (Correct answer)

Correct answer: 25 m/s

Speed = 360 km/4 h = 90 km/h = 90 × (1000/3600) = 25 m/s.

Question 83: L,M,N,O,P,Q are the six members of a family that includes two married couples. P is a teacher who is married to N and Q's mother, a doctor. L is the wife of M, the lawyer. P has a son and a grandson. One of the two married ladies is a stay-at-home mom. In the family, there is also a student and a male engineer. Which of the following statements regarding the family's granddaughter is true?

She is a engineer
She is a doctor
She is a student (Correct answer)
She is a lawyer

Correct answer: She is a student

Based on the family structure deduced (P and N are grandparents, Q is their son, and O is Q's daughter, making her the granddaughter), and the remaining occupations, O is identified as the student. P is a teacher, N a doctor, M a lawyer, L a stay-at-home mom, and Q a male engineer. This leaves the student role for O, the granddaughter.

Question 84: A clock shows 3:15. What is the angle between the hour and minute hands?

0°
15°
7.5° (Correct answer)
22.5°

Correct answer: 7.5°

At 3:15, the minute hand is at 90° and the hour hand is at 97.5° (3×30 + 15×0.5), so the angle is 7.5°.

Question 85: Which gas is produced when dilute hydrochloric acid reacts with zinc?

Carbon dioxide
Oxygen
Nitrogen
Hydrogen (Correct answer)

Correct answer: Hydrogen

When zinc reacts with dilute HCl, zinc chloride and hydrogen gas are produced: Zn + 2HCl → ZnCl₂ + H₂.

Question 86: In Quantitative Aptitude of SSC exams, which topic is most commonly tested?

Percentages, ratios, and time-and-work (Correct answer)
Indian dance forms
Constitutional law articles
English idioms

Correct answer: Percentages, ratios, and time-and-work

Quantitative Aptitude focuses on arithmetic, algebra, geometry, and data interpretation.

Question 87: Choose the correct synonym for 'ELOQUENT':

Dull
Fluent (Correct answer)
Silent
Confused

Correct answer: Fluent

Eloquent means well-spoken or fluent in expressing oneself, so 'Fluent' is the correct synonym.

Question 88: Identify the correctly spelled word:

Accommodtion
Accommodation (Correct answer)
Acommodation
Accomodation

Correct answer: Accommodation

The correct spelling is 'Accommodation' with double 'c' and double 'm'.

Question 89: Which number should replace the question mark? 5 : 25 :: 7 : ?

49 (Correct answer)
56
47
35

Correct answer: 49

The relationship is x : x², so 7 : 7² = 7 : 49.

Question 90: The unit used to measure the frequency of sound waves is:

Hertz (Correct answer)
Pascal
Joule
Decibel

Correct answer: Hertz

Hertz (Hz) is the SI unit of frequency, defined as one cycle per second, and is used to measure sound wave frequency.

Question 91: The 'Chipko Movement' was associated with:

Forest conservation (Correct answer)
Animal rights
Anti-corruption protests
Water conservation

Correct answer: Forest conservation

The Chipko Movement, started in 1973 in Uttarakhand, was a forest conservation movement where people hugged trees to prevent felling.

Question 92: The radius of a circle is doubled. By what percentage does its area increase?

200%
300% (Correct answer)
100%
400%

Correct answer: 300%

New area = π(2r)² = 4πr², which is 4 times the original; increase = 300%.

Question 93: A sum doubles itself in 8 years at simple interest. What is the rate of interest per annum?

10%
12.5% (Correct answer)
12%
15%

Correct answer: 12.5%

SI = P (doubles means SI = P); P = P×R×8/100, so R = 100/8 = 12.5%.

Question 94: Two numbers are in the ratio 3:5. If their sum is 160, what is the larger number?

120
80
100 (Correct answer)
60

Correct answer: 100

Larger number = (5/8) × 160 = 100.

Question 95: Fill in the blank: He is _____ honest man.

a
the
no article needed
an (Correct answer)

Correct answer: an

'Honest' begins with a silent 'h' and a vowel sound /ɒ/, so the article 'an' is used before it.

Question 96: What type of mirror is used in the rear-view mirrors of vehicles?

Concave mirror
Plane mirror
Convex mirror (Correct answer)
Parabolic mirror

Correct answer: Convex mirror

Convex mirrors provide a wider field of view and always form virtual, erect, and diminished images, making them ideal for rear-view mirrors.

Question 97: What is the full form of 'URL'?

Uniform Resource Locator (Correct answer)
Universal Resource Link
Uniform Reference Locator
Universal Resource Locator

Correct answer: Uniform Resource Locator

URL stands for Uniform Resource Locator, which is the address used to access resources on the internet.

Question 98: Six students are seated on the ground: L,M,N,O,P,Q. The Pearl House is made up of L and M, whereas the Sapphire House is made up of everyone else. O and Q are tall, whereas the rest of the group is short. N and O are wearing glasses, whereas the rest of the group is not. Which Sapphire house girl is tall and wears glasses?

O (Correct answer)
N
L
M

Correct answer: O

Let's break down the criteria: Sapphire House members are N, O, P, Q. Tall students are O, Q. Students wearing glasses are N, O. Combining these, the Sapphire house member who is tall and wears glasses is O. O is in Sapphire House, is tall, and wears glasses, fitting all conditions.

Question 99: What is 15% of 240?

44
32
36 (Correct answer)
40

Correct answer: 36

15% of 240 = (15/100) × 240 = 36.

Question 100: What is the purpose of a firewall in a computer network?

To increase storage capacity
To protect against unauthorized access (Correct answer)
To store backup data
To speed up internet connection

Correct answer: To protect against unauthorized access

A firewall monitors and controls incoming and outgoing network traffic to protect against unauthorized access.

SSC CGL (Staff Selection Commission Combined Graduate Level)

The SSC CGL Tier 1 exam is a computer-based objective test conducted by the Staff Selection Commission of India to recruit candidates for Group B and C posts in central government departments, testing General Intelligence, General Awareness, Quantitative Aptitude, and English Comprehension.

100

Questions

60 min

Time Limit

40%

To Pass

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