Indian Army Agniveer Technical Mock Test - 6 - Indian Army Agniveer MCQ

The correct answer is Waldemar Haffkine.
Key Points

• Waldemar Haffkine was a Ukrainian-French bacteriologist.
• He is credited as being the first microbiologist to create and administer cholera and bubonic plague vaccines.
• He tested the vaccines on himself.
• He was described as "a savior of humanity" by Lord Joseph Lister.
• As part of Queen Victoria's Diamond Jubilee Honors in 1897, he was named a Companion of the Order of the Indian Empire (CIE).

Important Points

• Cholera:
  • It is an extremely virulent disease that can cause severe acute watery diarrhoea.
  • It is caused by infection of the intestine with Vibrio cholerae bacteria.
  • After consuming infected food or water, symptoms usually appear between 12 hours and 5 days later.
• Plague:
  • It is caused by the bacterium, Yersinia pestis.
  • The most common ways for humans to contract the plague are through handling a plague-infected animal or by getting bitten by a rodent flea that is carrying the disease.

Additional Information

• Maurice Hilleman:
  • He was one of the greatest microbiologists and vaccinologists.
  • He developed a rubella vaccine in 1969 and paired it with his mumps and measles vaccine in 1971 to create the MMR shot.
• Robert Goddard:
  • He was an engineer, professor, physicist, and inventor.
  • He is credited with building the world's first liquid-fueled rocket.
• Charles Martin Hall:
  • American chemist Charles Martin Hall created a low-cost technique for isolating pure aluminium from its compounds in 1886.

The correct answer is Journalism.

Key Points

• The Pulitzer Prize is regarded as the highest national honor in print journalism, newspaper, magazine, literary achievement, and musical composition within the United States. Hence, the correct answer is Journalism.
• Established in 1917 from funds endowed by journalist and newspaper publisher Joseph Pulitzer, the first Pulitzer Prizes were awarded on June 4, 1917, and are now awarded each May.
• The award is administered by Columbia University in the United States.
• Prizes are awarded yearly in 21 categories and in 20 of them, the winner receives a certificate and cash prize of $15,000. In the public service category, the winner is awarded a gold medal.

Additional Information

• Most Prestigious Art Awards:
  • Lalit Kala Academy Award
  • Shilp Guru
  • HugoBoss Prize
  • Turner Prize
  • National Medal of Arts
• Most Prestigious Cinema Awards:
  • National Film Awards
  • Oscars
  • Dadasaheb Phalke Award
  • Golden Globes
  • Academy Awards
• Most Prestigious Literary Awards:
  • Nobel Prize in Literature
  • National Book Awards
  • Booker Prize
  • Pulitzer Prize
  • Sahitya Akademi Award
  • Jnanpith Award

Mistake Points

• We have changed the third option to sports which was given as 'Literature' as the award is given in the field of both journalism and Literature.

The correct answer is the Jallianwala Bagh massacre.

Key Points

• The letter was written by Rabindranath Tagore to Lord Chelmsford, the British viceroy, repudiating his Knighthood in protest of the Jalianwalla Bagh mass killing.
• Rabindranath Tagore was a Bengali polymath who worked as a poet, writer, playwright, composer, philosopher, social reformer, and painter.
  • He reshaped Bengali literature and music as well as Indian art with Contextual Modernism in the late 19th and early 20th centuries.

Additional Information

• The Jallianwala Bagh massacre, also known as the Amritsar massacre, took place on 13 April 1919.
  • A large peaceful crowd had gathered at the Jallianwala Bagh in Amritsar, Punjab to protest against the arrest of pro-Indian independence leaders Dr. Saifuddin Kitchlew and Dr. Satya Pal.
  • In response to the public gathering, the Anglo-Indian Brigadier R. E. H. Dyer surrounded the protesters with his Gurkha British Indian army unit, Sindh Sikh regiment, and 52nd Sikh regiment.
• The Chauri Chaura incident took place on 4 February 1922 at Chauri Chaura in the Gorakhpur district of the United Provinces in British India, when a large group of protesters participating in the non-cooperation movement, were fired upon by the police.

Explanation:

• Karnataka - kathak - Incorrect (kathak is from Uttar Pradesh)
• Assam - Buiya - Incorrect. (Buiya is from Arunachal Pradesh)
• Tamil Nadu - Lavani - Incorrect (Lavani is from Maharastra)
• Andhra Pradesh - Kuchipudi - Correct

Important Points

At present officially there are 9 classical dances in India.

• Bharatanatyam, from Tamil Nadu.

The logic followed here is:

Similarly,

Hence, the correct answer is "option (1)".

Calculation:

Given, (x + 2y3)  = y

⇒ xdy + 2y3dy = ydx

⇒ ydx - xdy = 2y3dy

Integrating both sides we get,

⇒ x = y³ + cy

∴ Solution of the differential equation is x = cy + y3

Solution

Dividing and multiplying the term by its conjugate.

Since, (1/cos²x = sec²x and sin/cos²x = tan x × sec x)

⇒ ∫(sec²x - tan x sec x) dx

⇒ ∫sec²x dx - ∫tan x sec x dx

⇒ tan x - sec x + c

The correct option is 2.

Concept:

A relation f from set A to set B is said to be a function if every element of set A has a unique image in set B.

Calculation:

1. If f is the subset of Z × Z defined by f = {(xy, x − y); x, y ∈ Z},

let x = 2, y = 3 → (2 × 3, 2 - 3) = (6, -1) ∈ f

and for x = -2, y = -3 → (-2 × (-3), -2 + 3) = (6, 1) ∈ f

So, the element 6 ∈ Z has two different images 1 and -1 in Z

⇒ f is not a function.

2. If f is the subset of N × N defined by f = {(xy, x + y); x, y ∈ N},

let x = 3, y = 4→ (3 × 4, 3 + 4) = (12, 7) ∈ f

and for x = 2, y = 6 → (2 × (6), 2 + 6) = (12, 8) ∈ f

So, the element 12 ∈ N has two different images 7 and 8 in N

⇒ f is not a function.

∴ The correct option is (4).

Concept:

The general term of (x + a)ⁿ is

T_{r + 1} = ⁿC_r (x)^{n - r} a^r

Calculation:

Given:

If the (r + 1)th term in the expansion of ¹⁰

Now consider,¹⁰

Here (r + 1)th term

Comparing the indices of x in x²⁰ and in T_r+1, we get

⇒ 30 - 3r - 2r = 20

⇒ 5r = 10

⇒ r = 2

∴ The correct answer is option (1).

For the term to be independent of n. The power of ‘x’ in the numerator and the denominator must be equal

∴ 6 – r = r

6 = 2r

⇒ r = 3

r = 3 corresponds to 4^th term,

∴ 4^th term will be independent of ‘x’

Therefore, the term independent of x in the expansion of is 160/27.

Explanation:

Given function,

Domain = (-∞, ∞) \{-3}

Let , where y is in the range of h(x).

⇒ (x + 3)y = x - 2

⇒ xy - x + 3y + 2 = 0

⇒ x(y - 1) = -(3y + 2)

y can take any real value but y ≠ 1

So, the range of h(x) is (-∞, 1) ∪ (1, ∞)

The correct answer is Nikola Tesla.Key Points

• Nikola Tesla was a Serbian-American inventor, electrical engineer, mechanical engineer, and futurist best known for his contributions to the design of the modern alternating current (AC) electricity supply system.
• His alternating current (AC) induction motor and related polyphase AC patents, licensed by Westinghouse Electric in 1888, earned him a considerable amount of money and became the cornerstone of the polyphase system which that company eventually marketed.
• Attempting to develop inventions he could patent and market, Tesla conducted a range of experiments with mechanical oscillators/generators, electrical discharge tubes, and early X-ray imaging.
• He also built a wirelessly controlled boat, one of the first ever exhibited.

Additional Information

The Correct answer is 30°.

Concept:

Reflection:

• The phenomenon in which a light ray is sent back into the same medium from which it is coming, on interaction with a boundary, is called reflection.

Laws of reflection:

• It states that the angle of the incident will be equal to the angle of reflection for a ray of light reflected from a plain polished surface.
  • The angle of incidence (θ i ) = Angle of reflection (θ r )
  • The incident ray, the reflected ray, and the normal to the surface of incidence always lie in the same plane.​

​

Calculation:

As per the question,
The incident angle formed by the mirror is 30º,

According to the law of reflection, the angle of reflection must equal the angle of incidence for each ray.

The angle of incidence (θ i) = Angle of reflection (θ r)

So, the angle of reflection is 30°.

The correct answer is newton.

Concept:

Fundamental quantity

• Fundamental quantities are physical quantities that are not dependent on other physical quantities.
• Example: length, mass, acceleration, time, current, luminous intensity, thermodynamic temperature, etc.

Derived quantity

• Derived quantity are those quantities that are dependent on fundamental quantities.
• Example: Area, volume, density, speed, force, velocity, etc.

Explanation:

• According to Newton's second law of motion, force is defined or expressed as the product of mass and acceleration.
• Mathematically, the force can be represented as:
• F = ma
• where,
• F is the force applied.
• m is the mass of the body.
• a is the acceleration.
• The SI unit of force is the newton which is represented by N.

Thus, the derived unit of the physical quantity, which is the product of mass and acceleration is newton.

Additional InformationSome fundamental and derived quantities, along with their SI units, are listed in the table below.

The correct answer is Hypermetropia

Key Points

• Hypermetropia:
  • Hypermetropia is a vision defect also known as a long-sightedness defect.
  • A person suffering from this is able to see distant objects clearly but unable to see nearby objects clearly.
  • This happens because the light enters the eye and forms the image behind the retina, instead of on the retina.
  • It generally occurs in elder age group people.
  • It is corrected with the convex lens spectacles.

Additional Information

• Myopia:
  • It is also known as a nearsightedness defect, In this person is unable to see the distant object clearly but can see the nearby objects clearly.
  • This happens because the light falling on the eye forms the image in front of the retina instead of the retina.
  • It is generally found in younger age groups.
  • It is corrected with the concave lens spectacles.
• Presbyopia:
  • A person suffering from this defect is unable to see nearby and far distant objects clearly.
  • It is corrected with the bifocal lens.
  • Bifocal lenses consist of both concave and convex lenses so as to correct the sightedness and will be able to see nearby as well distant objects clearly.

The correct answer is 3 × 108 m / second

Key Points

• Radio waves are made up of photons.
• Photon is also infrared, visual light, ultraviolet, X-ray, gamma-ray, etc.
• Photons move at the speed of light (3 × 108 m / second) (vacuum, light).
• Therefore radio waves travel at the speed of light.

Additional Information

• Uses of radio waves -
  • Today these radio waves are being used in various fields.
  • It has played an important role in the field of radio AM and FM stations i.e. information transmission.
  • Radio frequency energy is also used for medical treatment, it has been used in this field for the last 78 years.
  • This special type of surgery is used in the treatment of diseases like the accumulation of fluid in the body and insomnia.
  • Radio waves are also used for magnetic resonance imaging (MRI), through which an image of the entire human body is made.
  • The most famous use of ready waves is for communication, television, cell phones, and radio all get radio waves.
  • They are converted into mechanical work in the speaker to create sound waves.

The correct answer is 1.2 m.

Key Points

Given that,

The person can't see objects beyond 1.2 m directly

So, in order to view the distances beyond 1.2 m, the focal length of the lens should be 1.2 m.

Now, the power
P = 1/f
P = 1/1.2
P = 0.83 Dioptre(D)
So, if a person suffers from Myopia, the corrective lens will be the concave or diverging lens.

Additional Information

• A concave lens is a type of lens that diverges a straight light beam from the source into a diminished, upright, virtual image.
• According to the sign convention, the focal length of a concave lens is always negative.
• It has the ability to create only Virtual and erect images.
• They’re used to treating myopia because they make faraway items appear smaller than they are.

The correct answer is Gravitational Force.

Key Points

• In physics, gravitation is the force that pulls two masses toward each other.
• There is no range for gravitational force as it is directly proportional to the product of their masses.

Additional Information

• The electromagnetic force is a type of physical interaction that occurs between electrically charged particles.
• The strong nuclear force is the force that holds protons and neutrons together.
• The weak nuclear force is a fundamental force of nature that underlies some forms of radioactivity.
  • It also governs the decay of unstable subatomic particles such as mesons and initiates the nuclear fusion reaction that fuels the Sun.

The correct answer is Lambda(λ).

Key Points

• The wavelength is defined as the distance between the crests or troughs of a wave motion.
• Lambda (λ) is the 11th letter of the Greek alphabet.
• Wavelength is usually denoted by the Greek letter lambda (λ).
  • It is equal to the speed (v) of a wave train in a medium divided by its frequency (f): λ = v/f.

Additional Information

• Kappa (ϰ) is the 10th letter of the Greek alphabet.
  • Kappa (κ) is Einstein's constant of gravitation and denotes the coupling coefficient and susceptibility.
• Alpha (α) is the first letter of the Greek alphabet.
  • Alpha particles (a) are composite particles consisting of two protons and two neutrons tightly bound together.
• Eta (η) is the 7th letter of the modern Greek alphabet.
  • η stands for the ideality factor of a bipolar transistor, and has a value close to 1.000.

The correct answer is Speed.

Key Points

Explanation:

Speed:

• Speed is given by the distance covered by an object per unit of time.
• The magnitude of displacement in one second is called speed.
• Speed measures how fast the body is moving.
• The S.I. unit of speed is m/s.

Additional Information

Acceleration

• It is a rate of change of velocity with respect to time.
• Acceleration is a vector quantity, SI unit is ms-2, and dimension [LT-2].
• Acceleration is represented by the slope of the velocity-time curve.

Momentum

• Momentum is defined as the quantity of motion of the body.
• Momentum has both direction and magnitude.
• Its direction is the same as that of velocity, v.
• The SI unit of momentum is kilogram-meter per second (kg m s-1).

Force

• A push or a pull on an object is called a force.
• The SI unit of Force is Newton or kg ms-2.
• It is represented by the symbol N.

The correct answer is zero

• The weight of a body is maximum at poles and minimum at the equator on the surface of the earth.
• When it is placed at the center of the earth the weight of an object is zero because when an object is in the center, experiences gravitational pull from all directions & the weight of an object maximum on earth is on the poles.

Key Points

• Difference between Weight and Mass -
  • Weight (W) is the force of gravity exerted on an object.
  • Mass (m) is a measure of the inertia of the object.
• Some key terms are-

Concept:

Oxidation State:

• Oxidation states, often known as oxidation numbers, predict which substances in a chemical reaction have gained or lost electrons.
• An atom's oxidation number rises if electrons are lost. An atom's oxidation number will, however, fall if it gains electrons.

Variable Oxidation State:

• Certain elements in a periodic table show more than one oxidation state, such as transition metal elements. For instance, iron forms FeO and Fe₂O₃ in which Fe shows +2 and +3 oxidation states.

Explanation:O

• Nitrogen is a periodic table element with an atomic number of 7 and a mass number of 14. It's ground state electronic configuration is :

• Nitrogen contains 5 valence shell electrons. By gaining 3 electrons or by losing 5 electrons it attains a stable electronic configuration.
• Nitrogen forms various compounds and shows different oxidation states such as:

Nitrogen shows an oxidation state ranging from -3 to +5.

Conclusion:

Nitrogen shows variable oxidation states starting from -3 and ending with +5 and the oxide of nitrogen shows variable oxidation states starting from + 1 to +5.

Concept:

• Isotopes of hydrogen are: Protium Deuterium Tritium
• There is three known isotopes of hydrogen, each possessing an atomic mass 1, 2, 3 respectively. These are named protium, deuterium, and tritium.

Explanation:

Protium:

• The most common is the ordinary hydrogen usually called protium.
• It has one proton in the nucleus and an electron revolving around it.
• Protium is a selective “proton pump inhibitor”, a medicine that reduces the amount of acid produced in your stomach. It is used for treating acid-related diseases of the stomach and intestine.

Deuterium:

• The second isotope of hydrogen is called heavy hydrogen or deuterium.
• It consists of one proton and one neutron in the nucleus and electrons revolving around it.
• Deuterium is not radioactive and does not represent a significant toxicity hazard.
• Water enriched in molecules that include deuterium instead of protium is called Heavy water.
• Deuterium and its compounds are used as a non-radioactive label in chemical experiments and in solvents.
• It is widely used in prototype fusion reactors and has its application in military, industrial and scientific fields.
• In nuclear fusion reactors, it is used as a tracer and it is responsible to slow down neutrons in heavy water moderated fission reactors.

Tritium:

• The third isotope of hydrogen is called tritium.
• It consists of one proton and two neutrons in the nucleus and an electron revolving around it.
• A trace amount of tritium occurs naturally because of the interaction of cosmic rays with atmospheric gases.
• Tritium has also been released during nuclear weapon tests.
• The most common method of producing tritium is by bombarding a natural isotope of lithium, lithium-6 with neutrons in a nuclear reactor.

The correct answer is Steel.

Key Points

• Steel is an alloy made up of 98% of iron and 2% Carbon.
• Alloy: It is a solid-solid mixture of two or more metals and non-metal.
  • Alloy enhances the property of a particular metal.

Additional Information

• Types of Alloy:

The correct answer is Potassium-Po.

Key Points

• Potassium:
  • ​Potassium is a chemical element with the symbol K.
  • The Atomic number of potassium is 19.
  • It is a silvery-white metal that is smooth enough to be sliced with little force with a knife.
  • Potassium reacts rapidly with atmospheric oxygen within seconds of exposure to form flaky, white potassium peroxide.

Additional Information

The correct answer is Methane.

Explanation:

• Compressed Natural Gas (CNG) is a gas which is used very commonly.
• It is most commonly used as a fuel in automobiles.
• It is also being promoted as a fuel because it does not harm the environment.
• Compressed Natural Gas (CNG) mainly consists of methane gas (CH₄).
• It is a clear, odorless, and non-corrosive fuel that is extracted from natural gas wells or produced through processes like biogas production (from organic waste) or synthetic gas generation.
• Advantages of CNG -
  • It can be used directly for burning in homes and factories where it can be supplied through pipes.
  • Used as a clean fuel in industrial processes and power generation.
  • Less polluting.
  • Because C.N.G. is not toxic, it does not pollute groundwater.
  • Vehicles operating on CNG fuels produce a lot less noise when compared to gasoline and diesel vehicles, thus reducing noise pollution.
  • It is also very cost-effective.
  • When compared to other fuels, it is also much less flammable and poses little risk of fire.

Thus, the Compressed Natural Gas (CNG) mainly consists of methane.

The correct answer is Rayon, Nylon & Polyester.

Key Points

Synthetic fibres:

• Synthetic fibres (man-made fibres), are fibres created by humans by chemical synthesis.
• It is different from natural fibres.
• Synthetic fibre is also made up of a series of tiny units that are linked together which form a larger unit called a polymer.
• Each little unit is made up of a chemical compound
• Rayon, Nylon, Polyester and Acrylic are examples of Synthetic.

Additional Information

Nylon.

• It was created in 1931 without the use of any natural raw materials (plant or animal).
• Coal, water, and air were used to make it.
• It was the world's first completely synthetic fibre.
• Nylon is a strong, elastic, and light fibre.

​Rayon.

• Rayon has properties similar to those of silk.

• It is a man-made fibre and cheaper than silk.

• It is obtained from wood pulp.

Polyester.

• Polyester is made up of many units of an ester.

• It is suitable for making dress material because it is easy to wash and stays crisp and wrinkle-free.

• Terylene is a known polyester.

Concept:

A covalent compound is formed by the sharing of electrons between two atoms.

The number of electrons shared by an atom during the formation of its compound can be named covalency.

Explanation:

The given covalent molecule is .

The structure of the nitrogen dioxide molecule is shown below:

Nitrogen forms one coordinate covalent bond and one double bond regioselectively with each oxygen atom as shown in the image.

Hence, a total of four electrons are shared by nitrogen.

The covalency of nitrogen is 4.

Conclusion:

The correct answer is option 3) i.e. 4.