UPSC CAPF Archives

1. Which of the following statements about Bhagat Singh is/are NOT true ?

Which of the following statements about Bhagat Singh is/are NOT true ?

1. Bhagat Singh was influenced by socialist ideas
2. He was a member of the Hindustan Socialist Republican Association
3. Bhagat Singh threw a bomb in the Central Legislative Assembly in 1929 with the objective to kill as many people as possible

Select the correct answer using the code given below :

1 and 3

2 and 3

2 only

3 only

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

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The correct option is D.

Let’s evaluate each statement:
1. Bhagat Singh was influenced by socialist ideas: This is TRUE. Bhagat Singh was deeply influenced by socialist and communist ideologies and advocated for a socialist revolution. He was instrumental in renaming the Hindustan Republican Association (HRA) to the Hindustan Socialist Republican Association (HSRA).
2. He was a member of the Hindustan Socialist Republican Association: This is TRUE. Bhagat Singh was a prominent leader and member of the HSRA, playing a key role in reorganizing the revolutionary movement.
3. Bhagat Singh threw a bomb in the Central Legislative Assembly in 1929 with the objective to kill as many people as possible: This is FALSE. On April 8, 1929, Bhagat Singh and Batukeshwar Dutt threw two bombs in the Central Legislative Assembly (now Parliament) in Delhi. However, their stated objective was not to kill but “to make the deaf hear” the demands of the revolutionaries against oppressive laws like the Public Safety Bill and the Trade Disputes Bill. The bombs were deliberately thrown in a place where they would cause minimum injury, and they also threw leaflets explaining their motivations before surrendering.
The question asks for statements that are NOT true. Only statement 3 is not true.

Bhagat Singh’s act in the Assembly was intended as a symbolic protest and propaganda tool to raise public awareness about the revolutionary cause and government repression. Along with Batukeshwar Dutt, he surrendered peacefully after throwing the bombs. He was later tried and hanged along with Shivaram Rajguru and Sukhdev Thapar in the Lahore Conspiracy Case (related to the murder of police officer Saunders, who was responsible for the lathi charge that led to the death of Lala Lajpat Rai).

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2. Who among the following was NOT associated with the Kakori Conspiracy

Who among the following was NOT associated with the Kakori Conspiracy Case ?

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Ramprasad Bismil

Rajendra Lahiri

Ashfaqulla Khan

Surya Sen

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

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The correct option is D.

The Kakori Conspiracy Case (also known as Kakori Train Robbery) took place on August 9, 1925, when members of the Hindustan Republican Association (HRA) looted a train carrying government funds. Prominent revolutionaries involved in this incident included Ramprasad Bismil, Ashfaqulla Khan, Rajendra Lahiri, Roshan Singh, Chandrasekhar Azad, Sachindra Nath Bakshi, and others. Ramprasad Bismil, Ashfaqulla Khan, Rajendra Lahiri, and Roshan Singh were arrested, tried, and subsequently hanged. Surya Sen (Masterda) was a prominent revolutionary leader known for the Chittagong Armoury Raid in 1930 and was active in Bengal, distinct from the UP-based HRA operations like the Kakori case.

The Kakori Conspiracy was a significant event in the Indian independence movement, aimed at funding revolutionary activities. The revolutionaries involved became martyrs for the cause. The HRA later transformed into the Hindustan Socialist Republican Association (HSRA) under the influence of leaders like Bhagat Singh and Chandrasekhar Azad.

3. The Soda-acid fire extinguisher contains

The Soda-acid fire extinguisher contains

sulphuric acid and solution of sodium hydrogencarbonate

nitric acid and solution of sodium hydrogencarbonate

sulphuric acid and solution of sodium carbonate

sulphuric acid and solution of potassium carbonate

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

Download PDF Attempt Online

The correct option is A.

A soda-acid fire extinguisher operates based on the chemical reaction between an acid and a carbonate or bicarbonate to produce carbon dioxide gas. The standard composition of a soda-acid fire extinguisher involves sulphuric acid (H₂SO₄) and a solution of sodium hydrogencarbonate (sodium bicarbonate, NaHCO₃). When the extinguisher is activated (typically by inverting it or breaking a capsule), the acid mixes with the bicarbonate solution, leading to the reaction: H₂SO₄ + 2NaHCO₃ → Na₂SO₄ + 2H₂O + 2CO₂. The released CO₂ gas builds pressure, expelling the solution and also acts as a smothering agent to cut off oxygen supply to the fire.

Soda-acid fire extinguishers are effective against Class A fires (combustible materials like wood, paper, textiles) but are not suitable for Class B (flammable liquids), Class C (flammable gases), or Class D (metals) fires, especially not for electrical fires due to the water content. Modern fire extinguishers often use different agents like dry chemical powders, foam, or CO₂ directly.

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4. Which one of the following does NOT contain COOH group ?

Which one of the following does NOT contain COOH group ?

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Citric acid

Lactic acid

Tartaric acid

Ascorbic acid

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

Download PDF Attempt Online

The correct option is D.

The question asks which of the listed compounds does NOT contain a carboxylic acid group (-COOH). Citric acid (C₆H₈O₇) contains three -COOH groups. Lactic acid (C₃H₆O₃) contains one -COOH group and one hydroxyl (-OH) group. Tartaric acid (C₄H₆O₆) contains two -COOH groups and two -OH groups. Ascorbic acid (C₆H₈O₆), also known as Vitamin C, is a weak acid, but its acidity primarily arises from enol groups, not carboxylic acid groups. Its structure is based on a lactone ring and does not contain a -COOH functional group.

Citric acid is found in citrus fruits. Lactic acid is produced in muscles during strenuous exercise and found in sour milk. Tartaric acid is found in grapes and tamarinds. Ascorbic acid is a vital nutrient found in fruits and vegetables, essential for various metabolic processes.

5. Aluminium, Iron, Copper and Zinc are extracted from

Aluminium, Iron, Copper and Zinc are extracted from

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Bauxite, Magnetite, Malachite and Calamine respectively

Magnetite, Bauxite, Malachite and Calamine respectively

Calamine, Malachite, Magnetite and Bauxite respectively

Malachite, Magnetite, Bauxite and Calamine respectively

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

Download PDF Attempt Online

The correct option is A.

Aluminium is primarily extracted from Bauxite ore (hydrated aluminium oxide, Al₂O₃·nH₂O). Iron is commonly extracted from Magnetite (Fe₃O₄) or Hematite (Fe₂O₃). Copper is extracted from various ores, including Malachite (copper carbonate hydroxide, Cu₂(CO₃)(OH)₂) and Chalcopyrite (CuFeS₂). Zinc is extracted from ores like Calamine (Zinc Carbonate, ZnCO₃) or Sphalerite (Zinc Sulphide, ZnS). Option A correctly matches each metal with one of its principal ores in the specified order: Aluminium (Bauxite), Iron (Magnetite), Copper (Malachite), and Zinc (Calamine).

Other important ores for Iron include Hematite, Limonite, and Siderite. Besides Malachite, Cuprite and Azurite are also important copper ores. Sphalerite is another major zinc ore. The extraction processes for these metals involve various stages like mining, concentration, roasting, smelting, and refining.

6. Which of the following are the most favourable conditions for liquefyi

Which of the following are the most favourable conditions for liquefying a gas ?

Low pressure and high temperature

Low pressure and low temperature

High pressure and high temperature

High pressure and low temperature

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

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Liquefying a gas requires bringing its molecules closer together and reducing their kinetic energy so that intermolecular attractive forces become dominant. This is best achieved by applying high pressure (to reduce the space between molecules) and lowering the temperature (to reduce molecular motion).

– High pressure forces gas molecules closer, increasing the likelihood of intermolecular attractions.
– Low temperature reduces the kinetic energy of molecules, allowing attractive forces to overcome disruptive thermal motion.
– Every gas has a critical temperature above which it cannot be liquefied by pressure alone, regardless of how high the pressure is. Liquefaction is only possible at or below the critical temperature.

Below the critical temperature, the substance is called a vapor, and it can be liquefied by applying sufficient pressure. Above the critical temperature, it remains a gas even under high pressure; increasing pressure only increases its density, forming a supercritical fluid above the critical pressure. Therefore, high pressure and low temperature relative to the critical point are the most favorable conditions.

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7. Which one of the following will NOT show Tyndall effect ?

Which one of the following will NOT show Tyndall effect ?

Chalk powder freshly mixed with water

Lime juice

Few drops of milk mixed with water

Starch solution

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

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The Tyndall effect is the scattering of light by colloidal particles in a colloid or a suspension. True solutions, where the solute particles are too small (individual ions or molecules) to scatter light significantly, do not exhibit the Tyndall effect. Among the given options, lime juice is primarily a true solution (containing dissolved sugars, citric acid, etc.), while chalk powder in water (suspension), milk in water (emulsion/colloid), and starch solution (colloid) contain particles large enough to scatter light.

– Tyndall effect is a phenomenon where light is scattered as it passes through a colloid or suspension.
– This scattering makes the path of the light beam visible.
– True solutions do not show the Tyndall effect because the dissolved particles are too small.

The Tyndall effect is a useful way to distinguish between a true solution and a colloid. If a beam of light passed through the mixture is visible, it is likely a colloid or suspension. If the beam is not visible, it is likely a true solution.

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8. Which one of the following is known as Wood Spirit ?

Which one of the following is known as Wood Spirit ?

Methanol

Ethanol

Formaldehyde

Acetaldehyde

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

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Methanol (CH3OH) is historically known as wood alcohol or wood spirit because it was traditionally produced by the destructive distillation of wood.

– Methanol is the simplest alcohol.
– It is a volatile, flammable, poisonous liquid.
– Its historical source gave it the common name “wood spirit”.

Ethanol (C2H5OH) is grain alcohol, commonly found in alcoholic beverages. Formaldehyde (HCHO) is an aldehyde used as a preservative and disinfectant. Acetaldehyde (CH3CHO) is another aldehyde, toxic and a metabolic product of ethanol breakdown.

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9. What is the real interest rate on a Credit Card loan bearing 24% inter

What is the real interest rate on a Credit Card loan bearing 24% interest per year, if the rate of inflation is 10% ?

240%

34%

14%

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

Download PDF Attempt Online

The real interest rate is the nominal interest rate adjusted for the effects of inflation. The approximate relationship is given by the Fisher equation:
Real Interest Rate ≈ Nominal Interest Rate – Inflation Rate
Given:
Nominal Interest Rate = 24%
Inflation Rate = 10%
Real Interest Rate ≈ 24% – 10% = 14%

– The nominal interest rate is the stated interest rate without accounting for inflation.
– Inflation erodes the purchasing power of money over time.
– The real interest rate reflects the actual increase in purchasing power received by the lender (or paid by the borrower) after accounting for inflation.

The exact formula for the real interest rate is (1 + nominal rate) = (1 + real rate) * (1 + inflation rate).
1 + Real Rate = (1 + Nominal Rate) / (1 + Inflation Rate)
1 + Real Rate = (1 + 0.24) / (1 + 0.10)
1 + Real Rate = 1.24 / 1.10
1 + Real Rate ≈ 1.12727
Real Rate ≈ 1.12727 – 1 = 0.12727 or 12.73%.
However, the approximate formula is commonly used, especially in multiple-choice questions where the options are spaced out, and it matches one of the options (14%) closely enough considering the approximation inherent in the question’s context.

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10. Suppose that the price of a commodity increases from ₹ 90 to ₹ 110 and

Suppose that the price of a commodity increases from ₹ 90 to ₹ 110 and the demand curve shows that the corresponding reduction in quantity demanded is from 240 units to 160 units. Then, the coefficient of the price elasticity of demand will be

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1·0

2·4

0·5

2·0

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

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To calculate the coefficient of price elasticity of demand, we can use the midpoint formula which is suitable for discrete changes:
PED = |(Q2 – Q1) / ((Q1 + Q2) / 2)| / |(P2 – P1) / ((P1 + P2) / 2)|
Given:
P1 = ₹ 90, Q1 = 240 units
P2 = ₹ 110, Q2 = 160 units
Change in Q = Q2 – Q1 = 160 – 240 = -80
Change in P = P2 – P1 = 110 – 90 = 20
Midpoint Q = (Q1 + Q2) / 2 = (240 + 160) / 2 = 400 / 2 = 200
Midpoint P = (P1 + P2) / 2 = (90 + 110) / 2 = 200 / 2 = 100
PED = |-80 / 200| / |20 / 100|
PED = |-(0.4)| / |(0.2)|
PED = 0.4 / 0.2
PED = 2.0

– The price elasticity of demand measures the responsiveness of quantity demanded to a price change.
– The formula for arc elasticity (midpoint method) is appropriate for calculating elasticity over a range of prices and quantities.
– The absolute value of the calculated elasticity is typically reported.

The resulting elasticity of 2.0 indicates that demand is elastic between these two price points, as the percentage change in quantity demanded (40%) is greater than the percentage change in price (20%).