CPCB Scientist PYQs solved Paper CBT Test

Question 1

The objectives of the Wild Life (Protection) Act, 1972 is:

Accepted Answer

उपर्युक्त सभी (All the above)

Answer

जैव विविधता को संरक्षित करना (To preserve the biodiversity)

Answer

जंगली जीवन की सुरक्षा और संरक्षण (Protection and conservation of wild life)

Answer

आवश्यक पारिस्थितिक और जीवन-सहायक प्रणालियों को बनाए रखना (To maintain essential ecological and life supporting systems)

Question 2

The first major environmental protection law promulgated in India was:

Accepted Answer

जल अधिनियम (Water Act)

Answer

वायु अधिनियम (Air Act)

Answer

पर्यावरण संरक्षण अधिनियम (Environmental Protection Act)

Answer

मोटर वाहन अधिनियम (Motor Vehicle Act)

Question 3

Methods used for softening water containing permanent hardness are:

Accepted Answer

उपरोक्त सभी (All of the above)

Answer

चूना-सोडा प्रक्रिया (Lime soda process)

Answer

जिओलाइट प्रक्रिया (Zeolite process)

Answer

रिवर्स ऑस्मोसिस (Reverse osmosis)

Question 4

Which one is non luminous?

Accepted Answer

चंद्रमा (Moon)

Answer

सूर्य (Sun)

Answer

तारा (Star)

Answer

धूमकेतु (Comet)

Question 5

In which one of the following sound travels fastest?

Accepted Answer

ठोस (Solid)

Answer

हवा (Air)

Answer

जल (Water)

Answer

निर्वात (Vacuum)

Question 6

Thinner particles responsible for deteriorating the air-quality resulting in the damage of vital body organs are referred as PM:

Accepted Answer

2.5

Answer

20

Answer

10

Answer

1

Question 7

Transboundary pollution (or) Acid rain is caused by:

Accepted Answer

नाइट्रोजन ऑक्साइड और सल्फर डाइऑक्साइड (Nitrogen oxide and sulphur dioxide)

Answer

हाइड्रोकार्बन (Hydrocarbon)

Answer

कार्बन डाइऑक्साइड (Carbon dioxide)

Answer

कार्बन मोनोऑक्साइड (Carbon monoxide)

Question 8

'Kyoto Protocol', an agreement signed by various countries, is associated with:

Accepted Answer

स्वच्छ पर्यावरण और जलवायु परिवर्तन (Clean Environment and Climate Change)

Answer

खतरनाक अपशिष्टों का संचलन (Movement of hazardous waste)

Answer

गहरे समुद्र में तेल और खनिज अन्वेषण (Deep Sea Oil and Mineral Exploration)

Answer

साझा खाद्य भंडार का निर्माण (Building common food stock)

Question 9

Which of the following are the key features of 'National Ganga River Basin Authority (NGRBA)'?
1. River basin is the unit of planning and management.
2. It spearheads the river conservation efforts at the national level.
3. One of the Chief Ministers of the States through which the Ganga flows becomes the Chairman of NGRBA on rotation basis.
Select the correct answer using the code given below:

Accepted Answer

1 और 2 केवल (1 and 2 only)

Answer

2 और 3 केवल (2 and 3 only)

Answer

1 और 3 केवल (1 and 3 only)

Answer

1, 2 और 3 (1, 2 and 3)

Question 10

The heat of hydration of cement can be reduced by:
(where $C_3A$ and $C_3S$ are tricalcium aluminate and tricalcium silicate respectively)

Accepted Answer

$C_3A$ के अनुपात को कम करके (reducing the proportions of $C_3A$)

Answer

$C_3A$ और $C_3S$ के अनुपात को बढ़ाकर (increasing the proportions of $C_3A$ and $C_3S$)

Answer

सीमेंट की महीनता बढ़ाकर (increasing the fineness of cement)

Answer

(a) और (c) दोनों (both (a) and (c))

Question 11

A feature "Bluetooth" now common in mobile phones gets its name from a:

Accepted Answer

10वीं शताब्दी के डेनिश राजा (Danish 10th Century King)

Answer

10वीं शताब्दी के चीनी राजा (Chinese 10th Century King)

Answer

यूके सॉफ्टवेयर कंपनी (UK Software Company)

Answer

ग्रीक देवी (Greek Goddess)

Question 12

Which of the following is an insulator?

Accepted Answer

अभ्रक / माइका (Mica)

Answer

स्टील (Steel)

Answer

गैल्वनाइज्ड स्टील (Galvanized steel)

Answer

कैडमियम कॉपर (Cadmium Copper)

Question 13

Rainbow is formed due to:

Accepted Answer

आंतरिक परावर्तन और विक्षेपण (Internal reflection and dispersion)

Answer

प्रकीर्णन और अपवर्तन (Scattering and refraction)

Answer

केवल परावर्तन (Reflection only)

Answer

विवर्तन और परावर्तन (Diffraction and Reflection)

Question 14

Who among the following has not won an Oscar?

Accepted Answer

देव पटेल (Dev Patel)

Answer

ए.आर. रहमान (A.R. Rahman)

Answer

सत्यजीत रे (Satyajit Ray)

Answer

भानु अथैया (Bhanu Athaiya)

Question 15

The Sun Temple is located at:

Accepted Answer

कोणार्क (Konark)

Answer

भुवनेश्वर (Bhubaneshwar)

Answer

महाबलीपुरम (Mahabalipuram)

Answer

मथुरा (Mathura)

Question 16

The gas used in artificial ripening of fruits is:

Accepted Answer

एसिटिलीन (Acetylene)

Answer

कार्बन डाइऑक्साइड (Carbon dioxide)

Answer

एथेन (Ethane)

Answer

ऑक्सीजन (Oxygen)

Question 17

The Tropic of Cancer passes through the states of:
1. Gujarat; 2. Jharkhand; 3. Assam; 4. Mizoram

Accepted Answer

1, 2 और 4 (1, 2 and 4)

Answer

1 और 2 (1 and 2)

Answer

1, 3 और 4 (1, 3 and 4)

Answer

1, 2, 3 और 4 (1, 2, 3 and 4)

Question 18

Out of the given alternatives, choose the one which best expresses the meaning of the word "Sultry":

Accepted Answer

गर्म और चिपचिपा / उमसदार (Hot and sticky)

Answer

अप्रिय (Unpleasant)

Answer

दुर्गंधयुक्त (Ill-smelling)

Answer

अशुद्ध (Impure)

Question 19

Select the correct meaning of the word "seminary":

Accepted Answer

कॉलेज / प्रशिक्षण संस्थान (College)

Answer

चैपल (Chapel)

Answer

दीक्षांत समारोह कक्ष (Convocation hall)

Answer

छात्रावास (Hostel)

Question 20

Choose the option which is the antonym of the word "folly":

Accepted Answer

बुद्धिमत्ता (Wisdom)

Answer

विषहर औषधि (Antidote)

Answer

विनम्रता (Humility)

Answer

दोषारोपण (Blame)

Question 21

Choose the option which is the antonym of the word "commend":

Accepted Answer

आलोचना करना (Criticize)

Answer

टिप्पणी करना (Comment)

Answer

त्याग देना (Forsake)

Answer

निपुणता (Dexterity)

Question 22

In the following options, the word "break" is used in four different ways. Choose the option in which the usage of the word is incorrect or inappropriate:

Accepted Answer

Unable to face the pressure, Sarah had a break-up.

Answer

After three hours of work, I am longing for a break.

Answer

My garment business has reached break-even.

Answer

She is still in a state of shock after the break-in.

Question 23

In the following options, the word "blow" is used in four different ways. Choose the option in which the usage of the word is incorrect or inappropriate:

Accepted Answer

The storm seems to be quite fierce, but I'm sure it will blow off by tomorrow.

Answer

The hijackers threatened to blow up the plane if the government failed to concede to their demands.

Answer

Losing both her parents in quick succession was an insufferable blow to her.

Answer

It is immodest to blow your own trumpet.

Question 24

A train X leaves station 'A' at 3 p.m. and reaches station 'B' at 4:30 p.m., while another train Y leaves station 'B' at 3:00 p.m. and reaches station 'A' at 4:00 p.m. These trains cross each other at:

Accepted Answer

3:36 p.m.

Answer

3:30 p.m.

Answer

3:20 p.m.

Answer

3:40 p.m.

Question 25

There are two urns. One contains two white balls and four red balls, the other contains three white and nine red balls. All balls are of the same shape and size. From each urn, one ball is drawn. What is the probability of getting both the balls of the same colour?

Accepted Answer

7/12

Answer

1/24

Answer

1/12

Answer

1/2

Question 26

P, Q and R are three consecutive odd numbers in ascending order. If the value of three times P is 3 less than two times R, find the value of R:

Accepted Answer

9

Answer

5

Answer

7

Answer

11

Question 27

Pipe A can fill a tank in 10 hours, and Pipe B can fill the same tank in 12 hours. Both the pipes are opened to fill the tank. After 3 hours, Pipe A is closed. Pipe B will fill the remaining part of the tank in:

Accepted Answer

5 घंटे और 24 मिनट (5 hours and 24 minutes)

Answer

5 घंटे (5 hours)

Answer

4 घंटे (4 hours)

Answer

3 घंटे (3 hours)

Question 28

In a certain class, 72% of the students prefer cold coffee, and 44% prefer fruit juice. If each of them prefers cold coffee or fruit juice, and 48 students like both, the total number of students in the class is:

Accepted Answer

300

Answer

240

Answer

200

Answer

250

Question 29

A vessel contains a mixture of milk and water in the ratio of 5:3 respectively. How much of the mixture must be siphoned off and replaced with water so that the mixture may be half milk and half water?

Accepted Answer

1/5

Answer

3/4

Answer

7/4

Answer

4/3

Question 30

A part of monthly hostel charges is fixed, and the remaining depends on the number of days one has taken food in the mess. When a student A takes food for 20 days, she has to pay Rs. 1000 as hostel charges, whereas a student B, who takes food for 26 days, pays Rs. 1180 as hostel charges. Find the fixed charges, and the cost of food per day:

Accepted Answer

400, 30

Answer

400, 40

Answer

300, 30

Answer

200, 20

Question 31

Directions (Questions 31-33): Seven villages A, B, C, D, E, F and G are situated as follows: E is 2 km west of B; F is 2 km north of A; C is 1 km west of A; D is 2 km south of G; G is 2 km east of C; D is exactly in the middle of B and E.
Q31: A is in the middle of:

Accepted Answer

G और C (G and C)

Answer

E और C (E and C)

Answer

F और E (F and E)

Answer

F और G (F and G)

Question 32

(Based on Q31-33): Which two villages are the farthest from one another?

Accepted Answer

F और B (F and B)

Answer

D और C (D and C)

Answer

F और E (F and E)

Answer

G और E (G and E)

Question 33

(Based on Q31-33): How far is E from F (in km) as the crow flies?

Accepted Answer

4

Answer

$\sqrt{20}$

Answer

5

Answer

$\sqrt{26}$

Question 34

In a certain code, ROUTINE is written as VMRGFLI. How will CRUELTY be written in that code language?

Accepted Answer

BGOVFIX

Answer

VOCVZRL

Answer

VPCVZRL

Answer

WPCVZRL

Question 35

How many pairs of letters are there in the word ADVERTISE each of which has as many letters between them in the word as they have in the English alphabet?

Accepted Answer

एक (One)

Answer

कोई नहीं (None)

Answer

दो (Two)

Answer

तीन (Three)

Question 36

'1' is subtracted from each odd digit and '1' is added to each even digit in the number 5249836. Which of the following will be the difference between the third digit from the left and the third digit from the right of the new number thus formed?

Accepted Answer

4

Answer

5

Answer

3

Answer

2

Question 37

Consider the following statements regarding 'Earth Hour':
1. It is an initiative of UNEP and UNESCO;
2. It is a movement in which the participants switch off the lights for one hour on a certain day every year;
3. It is a movement to raise the awareness about the climate change and the need to save the planet.
Which of the statements given above is/are correct?

Accepted Answer

2 और 3 केवल (2 and 3 only)

Answer

1 और 3 केवल (1 and 3 only)

Answer

2 केवल (2 only)

Answer

1, 2 और 3 (1, 2 and 3)

Question 38

With reference to 'Global Environment Facility', which of the following statements is/are correct?

Accepted Answer

यह 'जैव विविधता सम्मेलन' (CBD) और UNFCCC के लिए वित्तीय तंत्र के रूप में कार्य करता है।

Answer

यह वैश्विक स्तर पर वैज्ञानिक अनुसंधान करता है।

Answer

यह OECD के तहत एक एजेंसी है।

Answer

A और B दोनों (Both A and B)

Question 39

With reference to 'Eco-Sensitive Zones', which of the following statements is/are correct:
1. Eco-Sensitive Zones are the areas that are declared under the Wildlife (Protection) Act, 1972;
2. The purpose of the declaration of Eco-Sensitive Zones is to prohibit all kinds of human activities in those zones except agriculture.
Select the correct answer using the code given below:

Accepted Answer

न तो 1 और न ही 2 (Neither 1 nor 2)

Answer

1 केवल (1 only)

Answer

2 केवल (2 only)

Answer

1 और 2 दोनों (Both 1 and 2)

Question 40

'Bio Carbon Fund Initiative for Sustainable Forest Landscapes' is managed by the:

Accepted Answer

विश्व बैंक (World Bank)

Answer

एशियाई विकास बैंक (Asian Development Bank)

Answer

अंतर्राष्ट्रीय मुद्रा कोष (International Monetary Fund)

Answer

संयुक्त राष्ट्र पर्यावरण कार्यक्रम (UNEP)

Question 41

In which year UN Conference on Environment at Stockholm (Sweden) was held?

Accepted Answer

1972

Answer

1982

Answer

1986

Answer

1970

Question 42

Which of the following is/are secondary pollutant(s)?

Accepted Answer

पेरोक्सीएसिटाइल नाइट्रेट (PAN)

Answer

सल्फर डाइऑक्साइड ($SO_2$)

Answer

हाइड्रोकार्बन (Hydrocarbons)

Answer

इनमें से सभी (All of these)

Question 43

The degradation of environmental pollutants by living microorganisms is known as:

Accepted Answer

बायोरेमेडिएशन (Bioremediation)

Answer

नैनोरेमेडिएशन (Nanoremediation)

Answer

केमरेमेडिएशन (Chemremediation)

Answer

इनमें से कोई नहीं (None of these)

Question 44

Which is the major sink for the atmospheric $CO_2$?

Accepted Answer

महासागर (Oceans)

Answer

नदियाँ (Rivers)

Answer

भूमि (Land)

Answer

इनमें से कोई नहीं (None of these)

Question 45

When is the 'World Environment Day' celebrated every year?

Accepted Answer

5 जून (June 5)

Answer

11 जुलाई (July 11)

Answer

5 सितंबर (September 5)

Answer

11 दिसंबर (December 11)

Question 46

The total dissolved solids (TDS) can be reduced by the following method:

Accepted Answer

उपर्युक्त सभी (All of the above)

Answer

आसवन (Distillation)

Answer

रिवर्स ऑस्मोसिस (Reverse osmosis)

Answer

आयन एक्सचेंज (Ion exchange)

Question 47

Which of the following salt is responsible for temporary hardness of water?

Accepted Answer

मैग्नीशियम कार्बोनेट / बाइकार्बोनेट (Magnesium carbonate)

Answer

मैग्नीशियम सल्फेट ($MgSO_4$)

Answer

कैल्शियम सल्फेट ($CaSO_4$)

Answer

कैल्शियम क्लोराइड ($CaCl_2$)

Question 48

$N_2$ and $O_2$ are main constituents of air but these do not react with each other to form oxides of nitrogen. Find the possible reason:

Accepted Answer

अभिक्रिया ऊष्माशोषी (endothermic) है और इसके लिए अत्यधिक उच्च तापमान की आवश्यकता होती है

Answer

अभिक्रिया केवल उत्प्रेरक की उपस्थिति में ही शुरू हो सकती है

Answer

नाइट्रोजन के ऑक्साइड अस्थिर हैं

Answer

$N_2$ और $O_2$ अपरिवर्तनीय हैं

Question 49

Photochemical smog occurs in warm, dry and sunny climate. Which of the following is not amongst the components of photochemical smog?

Accepted Answer

$SO_2$

Answer

$NO_2$

Answer

$O_3$

Answer

असंतृप्त हाइड्रोकार्बन (Unsaturated hydrocarbon)

Question 50

What is the pH of acid rain?

Accepted Answer

5.6 से कम (Less than 5.6)

Answer

5.6 से अधिक (More than 5.6)

Answer

लगभग 10.0 (About 10.0)

Answer

7.0 के पास (Near 7.0)

Question 51

GC is a promising technique in environmental analysis. What type of analysis it allows?

Accepted Answer

गुणात्मक और मात्रात्मक दोनों (Both qualitative & quantitative)

Answer

केवल गुणात्मक (Only qualitative)

Answer

केवल मात्रात्मक (Only quantitative)

Answer

इनमें से कोई नहीं (None of these)

Question 52

Which of the following cannot be used as adsorbent in Column adsorption chromatography?

Accepted Answer

पोटेशियम परमैंगनेट ($KMnO_4$)

Answer

मैग्नीशियम ऑक्साइड ($MgO$)

Answer

सिलिका जेल (Silica gel)

Answer

एल्यूमिना ($Al_2O_3$)

Question 53

In sea water, what is the ideal Redfield ratio is maintained at any depth?

Accepted Answer

16:1

Answer

1:1

Answer

32:1

Answer

64:1

Question 54

In which year, the Environmental (Protection) Act was enacted?

Accepted Answer

1986

Answer

1972

Answer

1989

Answer

1974

Question 55

In which year, noise pollution has been inserted as pollution in the Air Act?

Accepted Answer

1987

Answer

1981

Answer

1982

Answer

2000

Question 56

The first of the major environmental protection act to be promulgated in India was:

Accepted Answer

जल अधिनियम (Water Act)

Answer

ध्वनि प्रदूषण नियम (Noise Pollution Rule)

Answer

वायु अधिनियम (Air Act)

Answer

पर्यावरण संरक्षण अधिनियम (Environmental Protection Act)

Question 57

During which stage of wastewater treatment are methanogenic microbes most important?

Accepted Answer

स्लज पाचन (Sludge digestion)

Answer

प्राथमिक उपचार (Primary treatment)

Answer

जैविक ऑक्सीकरण (Biological oxidation)

Answer

द्वितीयक उपचार (Secondary treatment)

Question 58

Which one is suitable for bioaugmentation process?

Accepted Answer

एक क्लीनअप साइट पर सूक्ष्मजीव जोड़ना (Adding microbes to a cleanup site)

Answer

उपचार के लिए प्रकाश का उपयोग करना (Using light for remediation)

Answer

बायोवेंटिंग (Bioventing)

Answer

स्लज हटाना (Sludge removal)

Question 59

Which convention adopted for the protection of ozone layer?

Accepted Answer

वियना कन्वेंशन (Vienna Convention)

Answer

बेसल कन्वेंशन (Basel Convention)

Answer

मॉन्ट्रियल प्रोटोकॉल (Montreal Protocol)

Answer

स्टॉकहोम कन्वेंशन (Stockholm Convention)

Question 60

Basel Convention is mainly dealing with:

Accepted Answer

खतरनाक अपशिष्ट और उनका निपटान (Hazardous wastes and their disposals)

Answer

जैविक विविधता (Biological diversity)

Answer

लगातार कार्बनिक प्रदूषक (Persistent organic pollutants)

Answer

ओजोन क्षरण (Ozone depleting)

Question 61

When algae grow on surface of water, it prevents:

Accepted Answer

पानी में सूरज की रोशनी की पहुंच (Access of sunlight in water)

Answer

पानी में बैक्टीरिया की पहुंच (Access of bacteria in water)

Answer

कवक की वृद्धि (Growth of fungi)

Answer

फर्न और मोसेस की वृद्धि (Growth of ferns and mosses)

Question 62

What is the cause of Blue baby syndrome?

Accepted Answer

पीने के पानी में अतिरिक्त नाइट्रेट (Excess nitrate in drinking water)

Answer

पीने के पानी में अतिरिक्त सल्फेट (Excess sulphate in drinking water)

Answer

पीने के पानी में अतिरिक्त क्लोरीन (Excess chlorine in drinking water)

Answer

पीने के पानी में अतिरिक्त फ्लोरीन (Excess fluorine in drinking water)

Question 63

With respect to water pollution, industrial, municipal sewage, treatment plants are examples of:

Accepted Answer

प्वाइंट स्रोत (Point Sources)

Answer

डिफ्यूज्ड स्रोत (Diffused sources)

Answer

स्टेशनरी स्रोत (Stationary Sources)

Answer

लाइन स्रोत (Line Sources)

Question 64

Holes are caused in the ..... layer of atmosphere:

Accepted Answer

स्ट्रैटोस्फीयर / समताप मंडल (Stratosphere)

Answer

आयनोस्फीयर (Ionosphere)

Answer

एक्सोस्फीयर (Exosphere)

Answer

ट्रोपोस्फीयर (Troposphere)

Parameter	Official Details
Recruiting Organization	Central Pollution Control Board (CPCB)
Advertisement Number	02/WQM-II/2025-Admin.(R)
Project Name	Strengthening of Environmental Regulators (SER)-Phase-III on River Ganga
Funding Agency	National Mission for Clean Ganga (NMCG), Namami Gange Programme
Total Vacancies	51 Posts
Job Nature	Contractual (Initially 1 Year, extendable up to 06.05.2028)
Post Locations	Delhi (Head Office), Lucknow, Kolkata, or Chandigarh
Application Fee	₹0 (NIL for all categories)
Official Portal	cpcb.gov.in

Event / Milestone	Date & Time
Online Application Opening Date	August 24, 2026 (10:00 AM)
Closing Date to Submit Online Application	September 7, 2026 (23:59 Hrs)
Interview / Written Test Date	To be announced on the CPCB official portal

Post Name	Total Posts	Upper Age Limit	Consolidated Monthly Salary
Scientist-D	01	50 Years	₹1,71,597/-
Scientist-C	08	45 Years	₹1,48,997/-
Scientist-B	12	35 Years	₹1,25,380/-
Assistant Manager (Finance)	03	35 Years	₹1,19,272/-
Administrative Assistant	01	35 Years	₹77,654/-
Scientific Assistant (SA)	13	35 Years	₹77,654/-
Taxonomist	01	35 Years	₹65,031/-
Data Entry Operator (DEO)	04	32 Years	₹57,498/-
Field Assistant	08	27 Years	₹38,741/-
Total Vacancies	51	—	—

CPCB Recruitment 2026: Apply Online for 51 Scientist, Scientific Assistant & Field Posts

CPCB Recruitment 2026: Apply Online for 51 Posts

📋 1. CPCB Recruitment 2026: Overview Table

🗓️ 2. Important Dates & Deadlines

💼 3. Vacancy Details, Upper Age Limit & Monthly Emoluments

💻 Live Test: CPCB Scientist & Technical Practice CBT Test

🎓 5. Detailed Eligibility Criteria

📝 6. Selection Process & How to Apply Online

❓ 7. Frequently Asked Questions (FAQs)

🔥 Most Downloaded

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CPCB Recruitment 2026: Apply Online for 51 Posts

📋 1. CPCB Recruitment 2026: Overview Table

🗓️ 2. Important Dates & Deadlines

💼 3. Vacancy Details, Upper Age Limit & Monthly Emoluments

💻 Live Test: CPCB Scientist & Technical Practice CBT Test

अभ्यास मोड (Practice Mode)

🎓 5. Detailed Eligibility Criteria

📝 6. Selection Process & How to Apply Online

❓ 7. Frequently Asked Questions (FAQs)

🔥 Most Downloaded

Get Chemistry Notes & Updates

Leave a Reply Cancel reply