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1.  
Which district has highest well irrigation in Tamil Nadu?

Correct Answer: B [Villupuram]

Notes:

Villupuram had the largest well-irrigated area in Tamil Nadu (2009-10 data). [Research Asst. (Animal Husbandry) 2023]

2.  
In Tamil Nadu the largest area of land is used for the cultivation of _____.

Correct Answer: B [Paddy]

Notes:

Paddy occupies the largest cultivated area in Tamil Nadu (34.4% in 2023-24). [Executive Officer Gr. I (HR&CE) 2024]

3.  
Which soil types are found in the southern zone of Tamil Nadu?

Correct Answer: A [Coastal Alluvial and deep red soil]

Notes:

The southern zone of Tamil Nadu has coastal alluvial and deep red soils. [CTS (Non-Interview Posts) 2025]

4.  
Match the following soils with their characteristics:
A – B
(a) Saline soil – 1. Clayey
(b) Black soil – 2. Sandy
(c) Alluvial soil – 3. Infertile
(d) Red soil – 4. Porous and loamy

Correct Answer: A [3 1 4 2]

Notes:

Saline soil is infertile, black soil clayey, alluvial porous-loamy, red soil sandy. [Group 2A Mains Re-Exam 2026]

5.  
Which of the following waterfalls is not located in Tamil Nadu?

Correct Answer: D [Palaruvi waterfall]

Notes:

Palaruvi waterfall is in Kollam district of Kerala, not Tamil Nadu. [GSASO 2020]

6.  
Across which river was the Sivasamudram dam built?

Correct Answer: C [Cauvery]

Notes:

Sivasamudram is on the Cauvery in Karnataka, site of an early 1902 hydro plant. [Veterinary Assistant 2020]

7.  
Which type of water body has the problem of salinity in Tamil Nadu?

Correct Answer: D [Ground water]

Notes:

Groundwater in Tamil Nadu faces salinity, mainly due to seawater intrusion. [Veterinary Assistant 2020]

8.  
Which river is called the "perennial river" in Tamil Nadu?

Correct Answer: D [Thamirabarani River]

Notes:

Thamirabarani, fed by both monsoons, is Tamil Nadu's perennial river. [ARGS 2020]

9.  
What percentage of the total length of the Cauvery flows in Tamil Nadu?

Correct Answer: C [56.0%]

Notes:

About 56% of the Cauvery's length (about 416 km) flows through Tamil Nadu. [PSY 2022]

10.  
The main aim of the "Nadanthai Vaazhi Cauvery" scheme is _____.

Correct Answer: B [Clean the River Cauvery]

Notes:

The Nadanthai Vaazhi Cauvery scheme aims to clean and restore the Cauvery river. [PSY 2022]

11.  
The "Sacred River of South India" is _____.

Correct Answer: C [Cauvery]

Notes:

The Cauvery, called Dakshina Ganga, is the sacred river of South India. [FA 2022]

12.  
Which one of the following rivers is not found in Tamil Nadu?

Correct Answer: C [Godavari]

Notes:

The Godavari does not flow in Tamil Nadu; Vaigai, Thamirabarani and Palar do. [Executive Officer Gr. III (HR&CE) 2022]

13.  
Thamirabarani is a perennial river that originates from the _____ of the Western Ghats.

Correct Answer: A [Agastyar Koodam peak of Pothigai hills]

Notes:

The Thamirabarani originates at Agastyar Koodam in the Pothigai hills. [SD 2022]

14.  
Which tributary is not connected with the Cauvery?

Correct Answer: D [Kolar]

Notes:

Harangi, Shimsha and Kabini are Cauvery tributaries; Kolar is not. [Asst. Conservator of Forests 2023]

15.  
Vattaparai waterfall is located in _____ district.

Correct Answer: A [Kanyakumari]

Notes:

Vattaparai waterfall is in Kanyakumari district. [AJ 2023]

16.  
Which of the following waterfalls is formed by the river Pambar?

Correct Answer: A [Kumbakkarai falls]

Notes:

Kumbakkarai falls in Theni district is formed by the Pambar river. [AAO & AHO 2024]

17.  
Which of the following statements is/are true about the Athikadavu–Avinashi project implemented by the Government of Tamil Nadu?
(i) Surplus water from the river Bhavani will be drawn and utilised for this project.
(ii) The project permits to utilise water for industrial purpose also.
(iii) Prime purpose of the project is the ground water recharge in drought prone areas in Erode, Tiruppur and Coimbatore districts.

Correct Answer: B [(i) and (iii) only]

Notes:

The Athikadavu–Avinashi project uses surplus Bhavani water to recharge groundwater in Erode, Tiruppur, Coimbatore. [CTS (Interview Posts) 2024]

18.  
Which of the following are incorrectly paired?
Rivers – Tributaries
(1) Cauvery – Amaravathi
(2) Thamirabarani – Pampar
(3) Vaigai – Pechiyar
(4) Vellar – Manjalar

Correct Answer: D [(3) and (4)]

Notes:

Manjalar is a Vaigai tributary; Thamirabarani–Pambar and Cauvery–Amaravathi are correct pairs. [Group 2A Mains 2025]

19.  
Which of the following is presently called the Island Grounds?

Correct Answer: A [Elambore river Island]

Notes:

Chennai's Island Grounds was earlier called the Elambore river island. [Group 2A Mains Re-Exam 2026]

20.  
The Mettur Dam is also called as :

Correct Answer: D [Stanley Reservoir]

Notes:

Mettur Dam's reservoir on the Cauvery is called Stanley Reservoir, after Governor George Stanley. [AGGS 2021]

21.  
Kodiveri Dam is constructed across :

Correct Answer: B [Bhavani River]

Notes:

Kodiveri Dam is built across the Bhavani River in Erode district. [CBT 2022]

22.  
Who worked as the Chief Engineer of the Mullaiperiyar Dam in 1895?

Correct Answer: C [Colonel John Pennycuick]

Notes:

Colonel John Pennycuick built the Mullaiperiyar Dam across the Periyar in 1895. [Executive Officer Gr. I (HR&CE) 2024]

? All 601 questions with full explanations and tables – PDF book ₹149: www.shanmugamiasacademy.in/study-materials/tnpsc-tamil-nadu-administration-pyq

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