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TNPSC Group IV 2013 General Studies

2013 · 100 questions · First 10 Solutions Free
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Q101 mcq
Consider the following statements : (i) The closure of Atrio ventricular valves result in "lubb" sound. (ii) The closure of semilunar valves result in "dubb" sound. Choose the right answer.
a.
(i) is correct and (ii) is wrong
b.
(i) is wrong and (ii) is correct
c.
Both (i) and (ii) are wrong
d.
Both (i) and (ii) are correct Correct Answer

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Q102 mcq
Name the vitamin and mineral necessary for blood clotting
a.
Vitamin D and Calcium
b.
Vitamin B and Sodium
c.
Vitamin K and Calcium Correct Answer
d.
Vitamin C and Iodine

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Q103 mcq
Choose the correct order of the parts marked in the diagram.
Question 3 image
a.
(1) TUC loop (2) Anticodon loop (3) DHU loop Correct Answer
b.
(1) Anticodon loop (2) TUC loop (3) DHU loop
c.
(1) TUC loop (2) DHU loop (3) Anticodon loop
d.
(1) DHU loop (2) Anticodon loop (3) TUC loop

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Q104 mcq
Name the gas which is evolved during photosynthesis
a.
Carbon dioxide
b.
Nitrogen
c.
Hydrogen
d.
Oxygen Correct Answer

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Q105 mcq
Match the following : (a) August Offer | 1. 1944 (b) C.R. Formula | 2. 1945 (c) Wavell Plan | 3. 1946 (d) Interim Government | 4. 1940
a.
4 3 2 1
b.
3 1 2 4
c.
4 1 2 3 Correct Answer
d.
1 3 4 2

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Q106 mcq
Match the following: (a) Nehru Report | 1. 1940 (b) Second Round Table Conference | 2. 1928 (c) Individual Satyagraha | 3. 1946 (d) Lord Attlee's Announcement | 4. 1931
a.
2 4 1 3 Correct Answer
b.
4 2 1 3
c.
2 4 3 1
d.
3 2 1 4

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Q107 mcq
Consider the following statements : Assertion (A) : V.O. Chidambaram Pillai established Swadeshi Steam Navigation Company in 1910. Reason (R) : V.O. Chidambaram Pillai is called as Kappalottiya Tamilan.
a.
Both (A) and (R) are true
b.
Both (A) and (R) are true but (R) is not the correct explanation of (A)
c.
(A) is true (R) is false
d.
(A) is false (R) is true Correct Answer

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Q108 mcq
Point out the wrong statement/statements in the following : (i) V.O.C. born at Ettayapuram. (ii) Annie Besant started Theosophical Society. (iii) Bharathiyar died at Pondicherry. (iv) E.V.R. started Self-Respect Movement.
a.
(i), (iii) and (iv)
b.
(ii), (iii) and (iv)
c.
(i), (ii) and (iv)
d.
(i), (ii) and (iii) Correct Answer

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Q109 mcq
Which of the following is incorrectly matched?
a.
Agricultural crops - Green Revolution
b.
Eggs and poultry - White Revolution Correct Answer
c.
Marine products - Blue Revolution
d.
Horticulture - Golden Revolution

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Q110 mcq
Consider the following and select the false ones : I. India's food problem is concerned with demand and supply of food grains. II. India's food problem is concerned with quality, distribution and economic reasons. III. India's food problem is concerned with procurement of food grains. IV. India's food problem is concerned with improper distribution.
a.
I and II false
b.
IV alone false
c.
III and IV false Correct Answer
d.
I and III false

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Q111 mcq
Consider the following table : Year : 1973-74 | 1987-88 | 1993-94 | 1999-2000 Number of Poor in India (in million) : 321 | 307 | 320 | 260 The year in which number of poor in India a sharp increase over that of the preceding year is
a.
1973-74
b.
1987-88
c.
1993-94
d.
1999-2000
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Q112 mcq
Consider the following statements : Assertion (A) : After the completion of the third five year plan 'Plan Holiday' was given. Reason (R) The third five year plan was affected by India-China war and India-Pakistan wars. Select your answer according to the coding scheme given below :
a.
Both (A) and (R) are false
b.
(A) is false and (R) is true
c.
(A) is true and (R) is false
d.
Both (A) and (R) are true
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Q113 mcq
Assertion (A) : To reduce the high tides of sea during storm oil is poured around the ship. Reason (R) Surface tension of oil is less than sea water, reduces the wrath of waves.
a.
A is correct R is wrong
b.
Both A and R are correct
c.
R is correct A is wrong
d.
Both A and R are wrong
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Q114 mcq
The property of attraction or repulsion between charged bodies is used in
a.
A.C. Generator
b.
Electrostatic paint spraying
c.
Potentiometer
d.
Metre Bridge
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Q115 mcq
The time periods of two simple pendulum are in the ratio 2 : 1. The corresponding ratio of their lengths is
a.
4 : 1
b.
1 : 4
c.
1 : 1
d.
1 : 2
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Q116 mcq
Arrange the Remote Sensing Satellites as per year of launching, in ascending order. I. IRS II. SPOT III. TRIOS IV. LANDSAT
a.
I, II, IV, III
b.
III, IV, II, I
c.
I, II, III, IV
d.
IV, III, I, II
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Q117 mcq
Identify the incorrect pair. I. Kanha - Madhya Pradesh II. Nandadevi - Uttranchal III. Manas - Assam IV. Namdhapa - Arunachala Pradesh
a.
I
b.
II
c.
III
d.
IV
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Q118 mcq
Choose the correct answer from the following : These occur as a result of continuous thunder storming.
a.
Landslides and floods
b.
Tsunami
c.
Earthquake
d.
Volcanic eruption
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Q119 mcq
Which of the following statements about 'Fertilizer' is TRUE? I. It should be available in low cost. II. It should be easily assimilated by plants. III. It should not dissolve readily in water.
a.
I and II
b.
II and III
c.
I and III
d.
III alone
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Q120 mcq
Identify the odd one from the group of chemicals given below : BHC, DDT, 2,4-D, Urea
a.
BHC
b.
DDT
c.
2,4-D
d.
Urea
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Q121 mcq
Who was the first woman judge of the Supreme Court?
a.
Hanna Chandy
b.
Vijayalakshmi Pandit
c.
Indira Gandhi
d.
Fathima Beevi
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Q122 mcq
Consider the following statements : Assertion (A) : The (ARC) recommended that the institution of Lokpal and Lokayakta. Reason (R) 1. should be demonstratively Independent and Impartial. 2. their appointment should be as far as possible non-Political. Select your answer according to the coding scheme given below.
a.
Both (A) and (R) are false
b.
Both (A) and (R) is correct
c.
(A) is false but (R) is true
d.
(A) is true but (R) is false
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Q123 mcq
Arrange the Presidents of India in chronological order of their term in Office. I. R. Venkatraman II. Dr. Sankar Dayal Sharma III. Dr. K.R. Narayanan IV. Dr. A.P.J. Abdul Kalam
a.
I, II, III, IV
b.
III, IV, I, II
c.
III, I, II, IV
d.
III, II, I, IV
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Q124 mcq
The Bhopal Gas Tragedy happened in
a.
1980
b.
1978
c.
1975
d.
1984
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Q125 mcq
The books 'Wings of Fire' was written by
a.
Nehru
b.
A.P.J. Abdul Kalam
c.
Kamaraj
d.
Mahatma Gandhi
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Q126 mcq
In the products 2a × 1a = 41a; 2b × 1b = 37b, a and b represent positive integers. Then a + b =
a.
15
b.
11
c.
7
d.
13
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Q127 mcq
Find the odd man out in the following : 1, 144, 16, 25, 49, 81, 121, 36, 62
a.
1
b.
49
c.
121
d.
62
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Q128 mcq
The World-Wide Tea product of 5 countries for the year 2011-2012. The angle subtended by E at the centre of the circle is
Question 28 image
a.
15°
b.
30°
c.
54°
d.
72°
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Q129 mcq
In an examination 30% of total students failed in English, 40% of students failed in Hindi and 20% in both. Find the percentage of students who passed in both the subjects.
a.
50%
b.
20%
c.
10%
d.
60%
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Q130 mcq
Three positions of the same die are given. Find the number opposite to the side represented by 2.
Question 30 image
a.
5
b.
3
c.
6
d.
1
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Q131 mcq
If RIVER is coded as OFSBO then WATER is decoded as
a.
ZDWIU
b.
ZDWHU
c.
ZCWIV
d.
ZCUJW
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Q132 mcq
A can complete 2/3 part of a work in 10 days. A can complete 1/3 part of the same work in
a.
3 days
b.
4 days
c.
5 days
d.
6 days
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Q133 mcq
Rs. 800 becomes Rs. 956 in 3 years at certain simple rate of interest. If the rate of interest is increased by 4%, what amount will Rs. 800 become in 3 years?
a.
Rs. 1,020.80
b.
Rs. 1,025
c.
Rs. 1,052
d.
Rs. 1,080.20
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Q134 mcq
Amala invests Rs. 6,000 in a bond which gives interest at 4% per annum during the first year, 5% during the second year, 10% during the third year. How much does she get at the end of the third year?
a.
Rs. 7,300
b.
Rs. 7,007.2
c.
Rs. 7,200
d.
Rs. 7,207.2
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Q135 mcq
What will come in the place of a question mark?
Question 35 image
a.
9
b.
6
c.
7
d.
3
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Q136 mcq
Find out the wrong number in the sequence. 623, 251, 543, 356
a.
543
b.
251
c.
623
d.
356
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Q137 mcq
Find out the wrong number in the sequence. 121, 264, 312, 462, 583
a.
583
b.
264
c.
121
d.
312
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Q138 mcq
Match : (a) Andhra | 1. Bharathanatyam (b) Kerala | 2. Kuchipudi (c) Tamil Nadu | 3. Bangra (d) Punjab | 4. Kathakali Codes:
a.
1 2 3 4
b.
3 1 4 2
c.
2 4 1 3
d.
4 2 3 1
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Q139 mcq
Anna changed, the official name of the state from 'Madras' to Tamil Nadu in
a.
1957
b.
1977
c.
1969
d.
1947
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Q140 mcq
Match the following : (a) Larkana District | 1. Gujarat (b) Kalibangan | 2. Punjab (c) Lothal | 3. Rajasthan (d) Harappa | 4. Sind
a.
3 1 2 4
b.
4 3 1 2
c.
1 2 4 3
d.
2 4 3 1
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Q141 mcq
Match the following with suitable options : List I (Works) | List II (Authors) (a) Kondrai Venthan | 1. Mayuram Vedanayagam (b) Neethineri Vilakkam | 2. Sivaprakasar (c) Nanneri | 3. Avvaiyar (d) Neethi Nool | 4. Kumaragurubarar
a.
2 3 4 1
b.
3 4 2 1
c.
3 2 1 4
d.
2 3 1 4
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Q142 mcq
Match the following with suitable options : List I (Age) | List II (Art style) (a) Kushanas | 1. Dravidian style (b) Guptas | 2. Vesara style (c) Chalukyas | 3. Nagara style (d) Cholas | 4. Gandhara Art style
a.
4 3 2 1
b.
4 2 1 3
c.
3 2 1 4
d.
3 1 2 4
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Q143 mcq
Match the authors with their books and choose the right option : (a) Malgudi Days | 1. Kautilya (b) Harsha Charita | 2. Swami Dayanand (c) Arthasasthra | 3. R.K. Narayan (d) Satyarth Prakash | 4. Bana Bhatta
a.
3 4 1 2
b.
2 3 4 1
c.
4 1 2 3
d.
3 1 4 2
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Q144 mcq
Match the following and choose the right answer : (a) Recent Military camp took place in | 1. Brazil (b) Snowden's plea for assylum was rejected by | 2. India (c) Serial Bomb-Blast took place at Mahabhodhi temple is in | 3. England (d) After 10 years Andy Murry brought laurels to his country by becoming Wimbledon Champion | 4. Egypt
a.
4 3 2 1
b.
3 1 2 4
c.
2 3 4 1
d.
1 2 3 4
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Q145 mcq
Point out the wrong statement in the following : I. National Animal - Tiger II. National Bird - Peacock III. National Flower - Rose IV. National Fruit - Mango
a.
I
b.
II
c.
III
d.
IV
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Q146 mcq
Who is the Whistle Blower, who brought the secret of American Intelligence, doing the Global Electronic Surveillance on other nations, to the world?
a.
Julian Assange
b.
Daniel Pearl
c.
Edward Snowden
d.
Mike Tisen
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Q147 mcq
Which article empowers the President to dissolve the Lok Sabha at any time before its tenure?
a.
Art 85
b.
Art 95
c.
Art 81
d.
Art 75
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Q148 mcq
Which is not the member of G-20?
a.
Argentina
b.
North Africa
c.
Bolivia
d.
Egypt
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Q149 mcq
Match the List I with List II and select the correctly matched answer : (a) Rheumatic arthritis | 1. Contagious disease (b) Pellagra | 2. Auto immune disease (c) Cholera | 3. Hereditary disease (d) Sickle cell anaemia | 4. Vitamin deficiency disease
a.
3 1 2 4
b.
2 4 1 3
c.
2 1 4 3
d.
3 4 2 1
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Q150 mcq
Match the Wild Life Sanctuaries in List I with their location in List II. (a) Viralimalai | 1. Western ghats (b) Mukkurthi National Park | 2. Kancheepuram district (c) Indira Gandhi Wild Life Sanctuary | 3. The Nilgiris (d) Vedanthangal | 4. Trichy district
a.
3 1 2 4
b.
4 3 1 2
c.
1 2 4 3
d.
2 4 3 1
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Q151 mcq
Which of the following is referred to as EMP pathway?
a.
Glycolysis
b.
Kreb's cycle
c.
Electron transport chain
d.
Pentose phosphate pathway
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Q152 mcq
Consider the following statements : Assertion (A) : Insectivorous plants digest proteins of insect body. Reason (R) : Insectivorous plants grown in Nitrogen (N₂) deficient soil. Select your answer according to the coding scheme given below :
a.
(A) is true but (R) does not explains (A)
b.
Both (A) and (R) are true, (R) explains (A)
c.
(A) is true (R) is false
d.
Both (A) and (R) are false
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Q153 mcq
Which of the following is/are wrong? I. Aligarh movement was led by Sir Syed Ahmed Khan. II. Sir Syed Ahmed Khan supported Shuddi movement. III. Sir Syed Ahmed Khan started Anglo-oriental college.
a.
II only
b.
I and II
c.
I and III
d.
I, II and III
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Q154 mcq
Which one of the following is correctly matched?
a.
Ettayapuram - Collector Ashe
b.
Jallian Walah Bagh Tragedy - Hunter Committee
c.
Swaraj Party - B.G. Tilak
d.
Prohibition - V.O. Chidambaranar
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Q155 mcq
Match List I with List II correctly and select your answer using the codes given below (a) Tattvabodhini Sabha | 1. Henry Vivian Derozio (b) Young Bengal Movement | 2. Vishnu Sashtri Pandit (c) Widow Remarriage Society | 3. Veeresalingam (d) Hitakarini Samajam | 4. Devendranath Tagore Codes:
a.
4 1 2 3
b.
4 3 2 1
c.
3 4 1 2
d.
2 1 4 3
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Q156 mcq
Consider the following statements with reference to the nature of the Indian National awakening : (i) It was basically started by intellectuals. (ii) It was a movement in which, all sections of society became united against the English. (iii) After 1920, national movement was led by Gandhiji. (iv) Gandhiji started the Khilafat movement. Which of the statements given above is/are correct?
a.
(i) and (ii)
b.
(i), (ii) and (iii)
c.
(i) and (iii)
d.
(ii), (iii) and (iv)
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Q157 mcq
The organisation which introduced Green Revolution in India is
a.
ICAR
b.
ICMR
c.
ISRO
d.
CSIR
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Q158 mcq
Framing of 5 year plans :
a.
National Development Council
b.
Prime Minister's Office
c.
United Nations Organisation
d.
Planning Commission
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Q159 mcq
Match the following : (a) Jawahar Gram Samriddhi Yojana | 1. 2000-2001 (b) National Social Assistance Programme | 2. 1993 (c) Employment Assurance Scheme | 3. 1999 (d) Pradhanmantri Gramodaya Yojana | 4. 1995
a.
3 1 2 4
b.
4 3 1 2
c.
3 4 2 1
d.
2 3 1 4
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Q160 mcq
Take the odd man out : India's Navaratna Companies
a.
BHEL
b.
BPCL
c.
IOL
d.
IPCL
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Q161 mcq
Who is the Father of Consumer Movement?
a.
Mahatma Gandhi
b.
Indira Gandhi
c.
John F. Kennedy
d.
Ralph Radar
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Q162 mcq
Who frames the monetary policy of India?
a.
Finance Minister of India
b.
Reserve Bank of India
c.
Prime Minister of India
d.
International Monetary Fund
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Q163 mcq
Consider the following statements. Choose the correct answer. "Comets have no tail". I. when they are far away from the sun. II. when they are close to the sun. III. when they are close to the earth. IV. when they are in between the earth and the sun.
a.
I, II, III and IV are wrong
b.
I is correct but II, III and IV are wrong
c.
I is wrong but II, III and IV are correct
d.
I, II, III and IV are correct
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Q164 mcq
Identify the Seaports and name them
Question 64 image
a.
Paradwip, Cochin, Chennai, Mangalore
b.
Mangalore, Paradwip, Chennai, Cochin
c.
Mangalore, Cochin, Chennai, Paradwip
d.
Cochin, Mangalore, Chennai, Paradwip
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Q165 mcq
I. Moon is called a Meteoroids. II. Moon is called a Satellite. III. Moon is called a Asteroids. IV. Moon is called a Comet.
a.
I and III are correct
b.
II is only correct
c.
II and IV are correct
d.
IV is only correct
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Q166 mcq
Choose incorrectly matched.
a.
Green Revolution - Agricultural crops
b.
White Revolution - Milk and Milk products
c.
Grey Revolution - Oil seeds
d.
Golden Revolution - Horticulture
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Q167 mcq
Choose the correct answer : In which District Grizzled Squirrel Wild Life Sanctuary is found?
a.
Nilgris
b.
Sivagangai
c.
Virdhunagar
d.
Kanyakumari
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Q168 mcq
The mixture present in the pencil lead is
a.
Carbon and Nitrogen
b.
Carbon and Oxygen
c.
Carbon and Clay
d.
Carbon and Glass
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Q169 mcq
Which of the following statement(s) about 'acid' is TRUE? I. It turns blue litmus paper to red. II. It has pH value greater than 7. III. It reacts with bases to give salt and water.
a.
I and II
b.
I and III
c.
II and III
d.
III only
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Q170 mcq
Which country became a member of the U.N.O. in the year 2011?
a.
East Timor
b.
Montenegro
c.
South Sudan
d.
Serbia
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Q171 mcq
The first meeting of the Constituent Assembly of India was held in
a.
1950
b.
1946
c.
1948
d.
1947
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Q172 mcq
Consider the following statements: Assertion (A) : The CVC has to present annually to the President a report on its performance. Reason (R) The President places this report before both House of Parliament. Select your answer according to the coding scheme given below.
a.
Both (A) and (R) are correct
b.
Both (A) and (R) are false
c.
(A) is false but (R) is true
d.
(A) is true but (R) is false
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Q173 mcq
Who presides over the joint sessions of the Parliament?
a.
The President
b.
The Vice-President
c.
The Speaker
d.
The Prime Minister
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Q174 mcq
The National Development Council was established in the year
a.
1952
b.
1955
c.
1959
d.
1962
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Q175 mcq
If 2+3 = 89, 3+4 = 2716, 4+3 = 649 then 1+2 = ?
a.
24
b.
14
c.
4
d.
10
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Q176 mcq
Five distinct items A, B, C, D and E are to be placed in distinct boxes numbered as 1, 2, 3, 4, 5. Items B and E cannot be grouped together. Maximum number of boxes can be left out without items is…
a.
1
b.
2
c.
3
d.
0
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Q177 mcq
In how many years did the sales of science books exceed the sales of arts books from 2000 to 2009?
Question 77 image
a.
4 years
b.
5 years
c.
6 years
d.
7 years
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Q178 mcq
Five persons A, K, L, R and U are sitting around a circular table. K is immediate left to U and R is between A and U, then immediate neighbours of L are…
a.
K and A
b.
U and A
c.
K and R
d.
A and R
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Q179 mcq
A circular ground of radius 7 m has a path of width 7 m around it on its outside. The area of the path is approximately equal to ________. (π = 22/7)
a.
154 sq.m.
b.
308 sq.m.
c.
462 sq.m.
d.
616 sq.m.
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Q180 mcq
A can do a work in 12 days; B in 6 days and C in 3 days. A and B start working together and after a day, C joins them. The total number of days required to complete the work is ________.
a.
2 2/7 days
b.
1 2/7 days
c.
2 1/7 days
d.
1 1/7 days
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Q181 mcq
At what rate percent compound interest does a sum of money become nine fold in 2 years?
a.
100%
b.
200%
c.
300%
d.
150%
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Q182 mcq
Simplify : ∜∛x²
a.
x^(1/6)
b.
x^(1/12)
c.
x^(1/3)
d.
x^(1/4)
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Q183 mcq
Find the missing block.
Question 83 image
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Q184 mcq
Find the greatest number that will divide 43, 91, 183 so as to leave the same remainder in each case.
a.
4
b.
7
c.
9
d.
8
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Q185 mcq
The number of number-pairs lying between 40 and 100 with their H.C.F. as 15 is
a.
3
b.
4
c.
5
d.
2
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Q186 mcq
A, B, C, D start at the same time to run around a circular garden in the same direction. A completes a round in 30 minutes, B in 60 minutes, C in 90 minutes and D in 105 minutes. After what time will they meet again at the starting point?
a.
15 hours
b.
10 hours
c.
21 hours
d.
20 hours
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Q187 mcq
Find the greatest number of 4 digits which is divisible by 15, 25, 40 and 75
a.
9600
b.
3000
c.
9800
d.
8540
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Q188 mcq
Dr. Muthulakshmi Reddy started an orphanage known as
a.
Saraswathi Illam
b.
Avvai Illam
c.
Anbu Illam
d.
Lakshmi Illam
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Q189 mcq
Match the following : (a) Rajendra Chola I | 1. Brahma Giri (b) Karavela | 2. Allahabad (c) Ashoka | 3. Hathi Kumbha (d) Samudra Gupta | 4. Malpadi
a.
2 4 3 1
b.
3 1 2 4
c.
4 3 1 2
d.
1 2 4 3
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Q190 mcq
Match List I with List II and select the correct answer using the codes given below (a) Brahmo Samaj | 1. Swami Vivekananda (b) Arya Samaj | 2. Madame Blavatsky (c) Ramakrishna Mission | 3. Rajaram Mohan Roy (d) Theosophical society | 4. Swami Dayanand Saraswathi
a.
3 4 1 2
b.
3 2 1 4
c.
4 1 2 3
d.
1 3 4 2
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Q191 mcq
Match the following river names with suitable options : List I (Ancient Name) | List II (New Name) (a) Shutudri | 1. Chenab (b) Vipas | 2. Sutlej (c) Parushini | 3. Beas (d) Asikini | 4. Ravi
a.
1 2 3 4
b.
2 4 1 3
c.
1 4 2 3
d.
2 3 4 1
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Q192 mcq
Arrange the following literary works in Chronological order : I. Mudra rakshasa II. Mattavilasa Prakasana III. Milindapanho IV. Arthasastra
a.
I, II, IV, III
b.
III, IV, I, II
c.
IV, I, III, II
d.
IV, III, I, II
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Q193 mcq
What is the study of Algae called?
a.
Physiology
b.
Phycology
c.
Mycology
d.
Pomology
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Q194 mcq
Which of these is not among the BRIC Nations?
a.
Chile
b.
Brazil
c.
China
d.
India
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Q195 mcq
Match List I with List II and choose the correct option using the coding scheme given below : (a) National Rural Employment Programme | 1. 1985 (b) Jawahar Rozgar Yojana | 2. 1993 (c) Indira Awaz Yojana | 3. 1980 (d) Prime Minister's Rozgar Yojana | 4. 1989
a.
4 1 3 2
b.
3 4 2 1
c.
3 4 1 2
d.
1 2 3 4
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Q196 mcq
The name of World's fastest Super Computer, announced on June 19, 2012 is
a.
HCL
b.
Sequidia
c.
Intel
d.
Lenova
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Q197 mcq
Who gave the name "Hindu rate of growth"?
a.
Dandekar and Rath
b.
Raj Krishnan
c.
P.D. Ojha
d.
B.S. Minhas
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Q198 mcq
Arrange the following countries based on the number of medals won in London Olympics-2012 in descending order. I. Britain II. Russia III. China IV. America
a.
I, III, II, IV
b.
IV, III, I, II
c.
IV, II, I, III
d.
IV, I, III, II
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Q199 mcq
Which article of the constitution provides for the imposition of President's rule in the states?
a.
Article 354
b.
Article 355
c.
Article 356
d.
Article 357
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Q200 mcq
'Aurora Borealis', the so called northern lights are due to
a.
the atomic collision of the trapped cosmic ray particles in the Earth's magnetic field
b.
the presence of a special phosphorescent material in the poles
c.
the interference of solar and terrestrial radiations
d.
all of the above
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