GS: Hindi / English · Language questions stay in their original language.
120 questions · 120 marks · 2 hours
Choose one option per question.
Tap an option to check it, or open “See answer”.
Correct answer: (B) 3 : 5
Take the ages ten years ago as x and 3x. Five years hence they will be x + 15 and 3x + 15, and 3(x + 15) = 2(3x + 15) gives 3x = 15, that is x = 5. So the present ages are 15 and 25 years, a ratio of 3 : 5.
Correct answer: (C) 6 km
Take the distance as d. The time at 5 km/hr is d/5 and at 6 km/hr d/6, and between the two cases there is a difference of 7 + 5 = 12 minutes, that is 1/5 hour, with respect to the train. So d/5 − d/6 = 1/5, that is d/30 = 1/5 and d = 6 km.
Correct answer: (C) ₹4,000
From the conditions P + Q = 10,100, Q + R = 12,500 and P + R = 10,400. Adding all three, 2(P + Q + R) = 33,000, so P + Q + R = 16,500. Taking Q + R = 12,500 from it leaves P = ₹4,000.
Correct answer: (C) 75%
From the condition 0·3P + 0·4Q = 0·8Q, so 0·3P = 0·4Q and Q = 0·75P. That is, Q is 75% of P.
Correct answer: (C) ₹2,000
In the ratio 5 : 2 : 4 : 3 the difference between C's and D's shares is 4 − 3 = 1 part, which equals ₹1,000. So one part = ₹1,000 and B's share = 2 parts = ₹2,000.
Correct answer: (B) ₹1,500
Correct answer: (B) 39
Take the numbers as 3x, 4x and 5x. The sum of the largest and the smallest is 3x + 5x = 8x, which equals 4x + 52. That gives 4x = 52 and x = 13, so the smallest number is 3 × 13 = 39.
Correct answer: (B) 2
Write the right side as a power of 2: 8 = 2³, so 1/8^(n−3) = 2^(−3(n−3)) = 2^(−3n+9). With the bases equal, 2n − 1 = −3n + 9, that is 5n = 10 and n = 2.
Correct answer: (A) Photo-voltaic cell
A photo-voltaic cell generates a voltage of itself when light falls on it, so it can be joined straight into a circuit without an external battery—the Commission's key takes that as the most suitable for digital applications.
Correct answer: (B) The minimum mass needed for chain reaction
The critical mass of a fissionable material is the least mass at which a chain reaction can keep itself going. Below it the neutrons escape and the reaction stops.
Correct answer: (B) Ethylene
Ethylene gas is used to ripen fruit quickly. It is the plant's own natural hormone, which hastens the ripening.
Correct answer: (C) n-octane
On the octane scale n-octane is taken as zero and iso-octane as 100, so the fuel of zero octane number is n-octane.
The Commission's key answers this ‘None of the above’, but n-octane is itself option 3 and the zero of the octane scale is fixed by it. The same answer is kept in the English copy of this question.
Correct answer: (A) Aril
The juicy part of a litchi that we eat is the aril, a fleshy growth that develops around the seed.
Correct answer: (A) Diffusion
The oxygen made in photosynthesis leaves the leaf through the stomata by diffusion—gases always spread from higher to lower concentration. Transpiration releases water vapour, and osmosis concerns water.
Correct answer: (C) Gene mapping
Finding the relative positions of genes on a chromosome, and the distances between them, is called gene mapping; the distance is judged from the frequency of recombination.
Correct answer: (B) Diploid
A bryophyte's life cycle is gametophyte-dominant, but the capsule belongs to the sporophyte. Its spore mother cell is diploid, and by meiosis it gives haploid spores.
Correct answer: (A) 2010
The National Green Tribunal was set up in 2010 under the National Green Tribunal Act, to settle cases concerning the environment and the forests quickly.
Correct answer: (E) None of the above
India's first underwater metro began in Kolkata, running through a tunnel under the Hooghly. All three cities given are wrong, so the answer is ‘None of the above’.
Correct answer: (B) Srinagar (Jammu and Kashmir)
Under India's G20 Presidency the Tourism Working Group Meeting was held at Srinagar in Jammu and Kashmir.
Correct answer: (B) Nirjala
The silver medal in the National Under-17 Girls Wrestling Championship was won by Nirjala.
Correct answer: (A) Geetanjali Shree and Daisy Rockwell
Correct answer: (B) Abdel Fattah El-Sisi
Correct answer: (A) Darbhanga
Bihar's first floating solar power plant was built in Darbhanga district, with the panels floated on the surface of a pond. That saves land, and the coolness of the water lets the panels work more efficiently.
Correct answer: (A) Maghai Paan
Maghai Paan of Bihar carries a Geographical Indication tag, which marks a product as belonging to a particular place by its qualities and reputation.
Correct answer: (B) a-2, b-3, c-4, d-1
Correct answer: (E) None of the above
The Subansiri, the Belsiri and the Manas all join the Brahmaputra from the north, so the answer is ‘None of the above’. The chief tributaries from the south are the Kopili and the Dhansiri.
Correct answer: (A) Arunachal Pradesh
The Likhapani glacier lies in Arunachal Pradesh.
Correct answer: (B) Middle Ganga plain
The Magadha and Anga plains lie in Bihar, which is part of the middle valley of the Ganga. The lower valley falls in West Bengal and the upper in Uttar Pradesh.
Correct answer: (D) More than one of the above
The Jog falls are on the Sharavati—that pair is right. But both Kapildhara and Dhuandhar are on the Narmada, not on the Kaveri or the Godavari. Two pairs being wrong, the answer is ‘more than one’.
Correct answer: (B) 4, 1, 2, 3
From north to south these ports run Visakhapatnam, Kakinada, Machilipatnam and Nagapattinam—that is 4, 1, 2, 3.
Correct answer: (C) India and Nepal
Correct answer: (B) Subhumid transitional
In R. L. Singh's classification Bihar falls in the subhumid transitional climatic division—the belt between the humid east and the drier west.
Correct answer: (B) Lahore Session, 1929
The resolution of ‘Purna Swaraj’ was adopted at the Lahore session of the Congress in 1929, presided over by Jawaharlal Nehru. The first Independence Day was kept on 26 January 1930.
Correct answer: (A) To purify the Sikh religion
The Kuka movement of Punjab began in order to free the Sikh religion of malpractices and purify it. Later, under Baba Ram Singh, it took the form of a boycott of British rule.
Correct answer: (A) V. D. Savarkar
Vinayak Damodar Savarkar, in his book ‘The Indian War of Independence, 1857’, called the revolt India's first war of independence. R. C. Majumdar disagreed with that view.
Correct answer: (A) Bihar and Bengal
The first instance of organised non-cooperation in the history of the Indian peasantry is found in Bihar and Bengal, where the peasants forced to grow indigo together refused to sow it.
Correct answer: (C) Food and Agriculture
In the Interim Government of 1946 Dr Rajendra Prasad was given the Food and Agriculture portfolio. He went on to be President of the Constituent Assembly and the country's first President.
Correct answer: (B) Rajkumar Shukla
It was the Champaran peasant Rajkumar Shukla who urged Gandhiji again and again to come and see the misery there, and the Champaran Satyagraha began in 1917.
Correct answer: (A) 22nd December, 1939
The Muslim League observed the ‘Day of Deliverance’ on 22 December 1939, after the Congress ministries resigned.
Correct answer: (C) Mahatma Gandhi
The foundation stone of the National College and of Bihar Vidyapeeth was laid by Mahatma Gandhi—both were national institutions of education set up during the Non-Cooperation Movement.
Correct answer: (A) چهار
Correct answer: (B) در جلو سمت چپ
Correct answer: (C) ترمز دستی در طرف چپ
Correct answer: (A) شیشه عقب
Correct answer: (E) هیچ یک از موارد فوق
Correct answer: (B) شیراز
Correct answer: (C) بغداد
Correct answer: (E) هیچ یک از موارد فوق
Correct answer: (A) سعدی
Correct answer: (E) هیچ یک از موارد فوق