Indian Navy Agniveer Mock Test - 8 - Indian Navy Agniveer MCQ

Here the correct answer is He had been called by someone on his cell phone.

Key Points

• In the given sentence, 'someone' is the subject and 'him' is the object.
• We need to reverse the positions of the subject and the object.
• 'had called' will be changed to 'had been called'.
• Thus, the correct answer is option 4.

Correct Passive Voice - He had been called by someone on his cell phone.

The correct answer is 'neither'

Key Points

• According to grammar, 'We use neither to refer to each of two things or people when you are making a negative statement that includes both of them.'
• Let's see an example-
  • They both smiled; neither seemed likely to be aware of my absence for long

So the correct sentence is- You can't use those screwdrivers neither of them is suitable for the job.

Additional Information

• The pronoun 'others' is used 'to refer things and people in general (indefinite)
  'Let's see an example-
  • ​Some projects are shorter than others.
• The determiner 'the other' is used with any noun (both for singular and plural nouns. but that noun should be definite)
  'Let's see an example-​
  • I'll read the other sections of the paper later
• The determiner 'some' is used 'to refer to a quantity of something or to a number of people or things when you are not stating the quantity or number precisely.
  Let's see an example-
  • He went to fetch some books.

The correct answer is: He asked me if I would like a drink.

Key Points

• The given narration is in Direct form. To change it into Indirect narration, following changes have to be made:
  • Reporting verbs such as ‘said/ said to’ change into asked, enquired or demanded.
  • In the above sentence, we will use 'If' as a joining clause.
  • Question mark(?) is changed into full stop (.)
  • The pronoun 'You' will be changed into 'I'.
• The sentence in the Direct speech is interrogative. To change it into assertive, we need to interchange the position of subject and verb.
• Hence, 'Would you' is changed into 'I would'.

Hence, the correct Indirect narration is: He asked me if I would like a drink.

Additional Information

• Rules for change of Present tense in indirect speech:
  • Present simple tense into Past simple tense.
  • Present continuous tense into Past continuous tense.
  • Present perfect tense into Past perfect tense.
  • Present perfect continuous tense into Past perfect continuous tense.

The correct answer is "The panel of judges asked the accused whether he had anything to say before they read the verdict."

Key Points

• There are a few things to keep in mind when changing a sentence from direct to reported speech.
  • When the question is not introduced by an interrogative word, the reporting verb is followed by if or whether.
  • The given sentence begins with "whether" after the reporting verb "asked".
  • The given sentence is an interrogative sentence so we can change the reporting verb to "asked".
  • If the reporting verb of the given sentence is in the past tense then the tense of the reported speech sentence will change.
  • The given sentence is in the present perfect tense which will change to the past perfect tense.
  • The first person pronoun "we" in the direct speech changes to the third person pronoun "they" in the reported speech.

The correct sentence is: The panel of judges asked the accused whether he had anything to say before they read the verdict.

Hence, the correct answer is option 2.

The correct answer is "certainty".

Key Points

• Certainty means the state of being completely sure about something.
  • Example: Death has to come to everyone and this is certain.
• Casuistry - use of clever arguments to trick people.
• Antonym means words having different meaning from other words.
• So, in this question, 'certainty' is opposite to 'casuistry' that's why an answer is 'certainty'.

Additional Information

• Sophistry - the use of clever but false arguments, especially with the intention of deceiving.
  • Example: She knows that it is pure sophistry on his part.
• Insinuation - the action of suggesting, without being direct, that something unpleasant is true.
  • Example: I reject the insinuation behind your question.
• Cacophony - a mixture of loud, unpleasant sounds or noise.
  • Example: I could not think of the cacophony of traffic.

The correct answer is "packing them"

Key Points

• In the given sentence, the usage of the pronoun 'it' is incorrect because 'it' is a singular object pronoun.
• In the given sentence, since we are referring to items so we need to use the object pronouns that are plural.
• Plural object pronouns include us, you, and them.
• We need to use them as an object pronoun in the sentence.

The correct sentence is: The shopkeeper checked all the items before packing them in the bag.

Hence, the correct answer is option 2.

CONCEPT:

• The carrier wave may be continuous (sinusoidal) or in the form of pulses.
• A sinusoidal carrier wave can be represented as,

⇒ c(t) = Acsin (ωct + ϕ)

Where c(t) = signal strength (voltage or current), Ac = amplitude, ωc = angular frequency and ϕ = initial phase of the carrier wave

• During the process of modulation, any of the three parameters, viz Ac, ωc, and ϕ of the carrier wave can be controlled by the message or information signal.
• This results in three types of modulation:
  • Amplitude modulation (AM)
  • Frequency modulation (FM)
  • Phase modulation (PM)
• Similarly, the significant characteristics of a pulse are pulse amplitude, pulse duration or pulse width, and pulse position (denoting the time of rise or fall of the pulse amplitude).

Hence, different types of pulse modulation are:

• Pulse amplitude modulation (PAM)
• Pulse duration modulation (PDM) or pulse width modulation (PWM)
• Pulse position modulation (PPM)

EXPLANATION:

Mixing up of signals from different transmitters:

• Another important argument against transmitting baseband signals directly is more practical in nature.
• Suppose many people are talking at the same time or many transmitters are transmitting baseband information signals simultaneously.
• All these signals will get mixed up and there is no simple way to distinguish between them.
• This points out a possible solution by using communication at high frequencies and allotting a band of frequencies to each message signal for its transmission.
• The above arguments suggest that there is a need for translating the original low-frequency baseband message or information signal into a high-frequency wave before transmission such that the translated signal continues to possess the information contained in the original signal.
• In doing so, we take the help of a high-frequency signal, known as the carrier wave, and a process known as modulation which attaches information to it.

• We know that the significant characteristics of a pulse are pulse amplitude, pulse duration or pulse width, and pulse position (denoting the time of rise or fall of the pulse amplitude). Hence, option 4 is correct.

CONCEPT:

• Refraction: When a ray of light passes from one medium to another it suffers a change in direction at the boundary of two media is called refraction.

• The change in direction because the speed of light travels at different speeds in different mediums.
• The Refractive Index of a medium defines that it is denser or rarer

Refractive Index (μ) = Speed of light in Vacuum (c) /speed of light in that medium (v).

• There are two laws of refraction:
  • The incident ray, the refracted ray, and the normal all lie in the same plane.
  • The second law is Snell’s law which states that The ratio of the sine of the angle of incidence to the sine of the angle of refraction is called the refractive index of the medium.

CALCULATION:

Given that:

Refractive index of glass (μ) = 1.6

The angle of refraction (r) = 2 × Angle of incidence (i)

Here light ray is passing from glass to air, So

Use snell's law:

μ sin i = 1. sin r = sin (2i) = 2 sin i × cos i

1.6 sin i = 2 sin i cos i

cos i = 1.6/2 = 0.8 = 8/10 = 4/5

Sin i = √(1 - cos²i) = √(1 - (4/5)²) = 3/5

So the angle of incidence (i) = sin^-1(3/5)

Hence option 2 is correct.

Concept:

The efficiency of Carnot or any reversible engine is given by:|

where, η = Efficiency of Carnot Engine, T1 = Source temperature in K, and T2 = Sink Temperature in K.

Calculation:

Given:


Putting values from eq(i) in eq(ii),

CONCEPT:

Kepler’s laws of planetary motion:

• The law of Orbits: Every planet moves around the sun in an elliptical orbit with the sun at one of the foci.
• The law of Area: The line joining the sun to the planet sweeps out equal areas in equal intervals of time. i.e. areal velocity is constant.
• According to this law, the planet will move slowly when it is farthest from the sun and more rapidly when it is nearest to the sun. It is similar to the law of conservation of angular momentum.
• The law of periods: The square of the period of revolution (T) of any planet around the sun is directly proportional to the cube of the semi-major axis of the orbit i.e. T2 ∝ r3

​

EXPLANATION:

Given - The period of revolution of a planet about the sun = T and Radius of the circular orbit = a

• By the law of periods, it is clear that,

• Hence, option 3 is correct.

Windows is correct.

Key Points

• Among the options, only Windows is NOT an open-source operating system.
• Windows is a closed source operating system marketed by Microsoft.
• Microsoft first introduced the Windows operating system on 20 November 1985.
• Closed Operating Systems are built with numerous codes and complex programming and that is called source code.
• An Open-source Operating System is the Operating System in which source code is visible publically and editable.
• The operating system is a collection of programs that controls the overall operations of the computer.
• An operating system is a System software in computers.
• It works as an interface between the user and computer hardware components.
• Examples of operating systems are:
  • Linux.
  • Unix.
  • DOS.
  • Windows.
  • Ubuntu.
  • Embedded operating system.
  • OpenBSD.
  • Mac OS.

Mistake Points

Windows is an operating system, but it is NOT an open-source operating system.

CONCEPT:

• The characteristics of wave motion are:
  • Energy is transferred from one place to another.
  • The velocity with which a wave travels is different from the velocity of the particle with which they vibrate about their mean position.
  • Mechanical wave requires a medium to propagate.
  • In a wave motion, the disturbance travels through the medium due to repeated periodic oscillation of the particles of the medium about their mean position.

On the basis of the direction of propagation, waves are classified into two types:

• Longitudinal Waves: Those waves whose direction of propagation and direction of disturbance is always parallel.
  • These waves produced in a medium that can sustain compressive strain.
  • Example Sound Wave
• Transverse Waves: Those waves whose direction of propagation and direction of disturbance is always perpendicular.
  • These waves produced in a medium that can sustain shearing strain.
  • Example: Electromagnetic Waves.

EXPLANATION:

• Energy is transferred without the actual transfer of particles.
• The velocity of the wave and the medium's particle is different.
• Mechanical waves require a medium to propagate.
• Since statement 4 is wrong. Hence option D is correct.

Concept:

Innate Immunity

• It is a type of non-specific, broad-range defense present since birth.
• It is already present in the body and not just produced in response to infection.

Explanation:

It consists of four types of barriers:

1. Physical barriers -
   • It is the structural obstruction that prevents entry into the body or target organ/tissue.
   • They do not necessarily kill the pathogen.
   • They just inhibit the movement by acting as a hurdle or obstacle.
2. Physiological barriers -
   • These barriers are related to the functions of body organs like they maintain temperature, pH, etc.
   • They might be produced in response to pathogen.
3. Cellular barriers -
   • It includes leukocytes and lymphocytes cells which attack the pathogen.
4. Cytokine barrier -
   • They are proteins secreted by cells of immune system that perform cellular communication.

The flowchart below depicts the four barriers along with their examples:

The correct answer is ​1 and 3 only.Key PointsLED Lamp:

• An LED lamp or LED light bulb is an electric light that produces light using light-emitting diodes (LEDs).
• LED lamps are significantly more energy-efficient than equivalent incandescent lamps and can be significantly more efficient than most fluorescent lamps.

Fluorescent Bulbs:

• They are made up of a glass tube that is filled with inert mercury vapour.
• The inside of the tube is lined with a phosphor coating.

• Hence, Option 3 is the correct answer.

Concept:

• According to Pascal’s Law, the pressure or intensity of pressure at a point in a static fluid is equal in all directions.
• For a plane surface of arbitrary shape immersed in a liquid in such a way that the plane of the surface makes an angle θ with the free surface of the liquid:

A = Total area of an inclined surface, h̅ = Depth of center of gravity of inclined area from a free surface, h* = Distance of center of pressure from the free surface of a liquid

Calculation:

Width = b = 4m, depth = d = 6m, angle of inclination = θ = 30 ° , Distance from free surface = 3 m

From the diagram above, we can see that

Vertical distance of CG from the top plate (x)

Sin θ =

 =

x = 1.5 m

Vetical distance of CG from top of free surface (h̅)

h̅ = distance of top of plate from free surface + x

h̅ = 3 + 1.5

h̅ = 4.5 m

The correct option is (4)

Internet Service Provider

Concept:-

ISP stands for an Internet service provider.

Key Points

• A business that gives its clients access to the internet and other web services is known as an ISP, or internet service provider.
• The business typically maintains web servers in addition to having a direct connection to the internet.
• An organization like AT&T, Verizon, Comcast, or Spectrum is an example of an Internet service provider (ISP), which offers businesses, families, and even mobile users access to the Internet.
• No, in order to access the Internet, both businesses and private users require an ISP.
• You won't be able to access the Internet if your ISP is down unless you have access through a different ISP.
• An ISP has the tools and telecommunications network access necessary to maintain an online presence in the region it serves.

The correct answer is option 2, i.e. Si (Silicon).

• Quartz is a crystalline compound which contains mainly SiO₂ (Silicon dioxide).
• It can be found in igneous, sedimentary as well as metamorphic rocks.
• Quartz can be further of many types depending on the trace elements present in it.

Piezoelectric materials:

• These materials produce an electric spark when mechanical stress is applied to them.
• The piezoelectric effect was demonstrated in 1880 for the first time by Pierre Curie and Jacques Curie.

Calculation:

Given integral I =

Let tan^-1x = t →

Putting the values in I,

⇒ I =

⇒ I = e^t + c
 

∴ The correct option is (1).

Concept:

In a G.P.,

nth term is calculated by: a_n = ar^n-1, where a = first term and r = common ratio.

Application:

In a G.P., If sixth term is 32

⇒ a₆ = ar^6-1 = 32

⇒ ar⁵ = 32......(equation 1)

And the eighth term is 128

⇒ a₈ = ar^8-1 = 128

⇒ ar⁷ = 128....(equation 2)

Dividing equation 1 by equation 2, we get,

r² = 4

⇒ r = 2

Concept:

The center of the circle x2 + y2 + 2gx + 2fy + c = 0 is (-g, -f) and its radius r is given by r2 = g2 + f2 - c.

Calculation:

The given equation of the circle is x2 + y2 - 2x - 4y - 5 = 0.

Comparing it with the general equation of the circle we get:

g = -1, f = -2, c = -5

Using the relation r2 = g2 + f2 - c, we get:

⇒ r2 = (-1)2 + (-2)2 - (-5)

⇒ r = √10

For doubling the area, the radius must become √2 times.

∴ Required radius = √20.

Center is (-g, -f) = (1, 2).

Equation of the circle is: (x - 1)² + (y - 2)² = (√20)²

⇒ x² + y² - 2x - 4y - 15 = 0.

Given:

No. of square-shaped boxes = 7

the number of rectangle-shaped boxes = 5

Concept used:

The probability of occurrence of an Event E is defined as

P(E) = Number of favorable outcomes/number of possible outcomes

P(E) = n(E)/n(S)

Calculations:

Here, n(S) = ¹²C₅

Let E₁ be the event of selecting the squared-shaped box

⇒ n(E₁) = ⁷C₃

Let E₂ be the event of selecting the rectangle-shaped box

⇒ n(E₂) = ⁵C₂

Now, the required probability = {n(E1) × n(E2)}/n(S)

∴ The answer is 175/396.

Concept:

A standard form of the ellipse is,

 whose coordinates of the foci is

A standard form of the hyperbola is, 

, whose coordinates of the foci is

Calculation:

Given: 

Given :

To find mode from grouped frequency distribution.

Formula used :

Mode = l+(f1−f02f1−f0−f2)×h

Where, I = the lower limit of the modal class.

h = the size of the class interval.

f1 = the frequency of the modal class.

f₀ denotes the frequency of the class preceding the modal class.

f2 denotes the frequency of the class succeeding the modal class.

Calculation :

l = 20, f₁ = 30, f₀ = 15, f₂ = 6, h = 30 - 20 = 10

Mode =  = 23.85

∴ The answer is 23.85.

Concept:

• Here we have to use the multiplication properties of the matrixes.

We know that,

(A + B)2 = (A + B) (A + B)

⇒ (A + B)2 = A2 + AB + BA + B2

Calculation:

Given:

• We know that,

AI = IA as I is an identity matrix so using the above result,

⇒ (aI + bA)2 = a2I² + b2A² + 2ab AI

= a2I2 + b2A2 + 2abA

⇒ (aI + bA)2 = a2I + 2abA

So, option 2 is correct.

Given:

Chapati is related to Wheat → Chapati is made from wheat.

Similarly,

Brick is related to clay soil → Brick is made from clay soil.

Hence, the correct answer is "Option (4)".

The correct answer is Punjab.
Key Points

The Anadnpur Sahib:

• It is located in Punjab near the Sutlej river.
• The last two Sikh gurus Guru Gobind Singh and Guru Tegh Bahadur lived here.
• Guru Gobind Singh founded the Khalsa Panth here.
• The Anadpur Sahib was founded by Guru Tegh Bahadur, the ninth guru.

Additional Information

• In the holy city of Anandpur Sahib, close to Chandigarh, the capital of the Indian state of Punjab, is the museum of Sikhism known as Virasat-e-Khalsa.
• The museum provides information on the historical occasions that occurred in Punjab five hundred years ago and gave rise to Sikhism and ultimately the Khalsa Panth.
• There is an auditorium with 400 seats located in the western area. It contains a sizable exhibition space and a library that houses all Sikhism-related journals, publications, books, and periodicals.
• The north wing of the eastern complex is sometimes referred to as the "flower building."

The logic followed here is:

Given 9 + 7 = 58 and 3 + 11 = 124

Logic, 9 + 7 = 58

9 + 7 → 9 + 7² → 9 + 49 = 58

And 3 + 11 = 124

3 + 11 → 3 + 11² → 3 + 121 = 124

Similarly, 13 + 5

13 + 5 → 13 + 5² → 13 + 25 = 38

Therefore, 13 + 5 is equal to 38.

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

The ratio of the ages:

Child : Father : Grandfather = 1 : 5 : 9

Three years hence, the age of the child is = 10 years

The age of child in present time = (10 - 3) = 7 years

As per the given ratio:

⇒ Child = 1 = 7 years

⇒ Present age of the grandfather = 9 = (9 × 7) = 63 years

⇒ Present age of the grandfather = 63 years

Hence, the correct answer is "Option (2)".

The Correct Answer is Field Marshall SHFJ Manekshaw.

Key Points

• Field Marshal Sam Manekshaw
  • During the Indo-Pakistani War of 1971, Field Marshal Sam Manekshaw was the Head of the Indian Army's Army Staff and the first Indian Army officer to be promoted to the rank of field marshal. Hence, Option 2 is correct.
  • Sam Manekshaw is the first Indian Army officer to be promoted to the five-star rank of field marshal.
  • His army career spanned four decades and five wars, starting in World War II with service in the British Indian Army. In 1932, Manekshaw entered the Indian Military Academy, Dehradun, for the first time.
  • In 1952, he became commander of the 167 Infantry Brigade and served in that position until 1954, when he assumed the position of military training director at the headquarters of the Army.
  • In the Indo-Pakistani War of 1971, which led to the formation of Bangladesh in December 1971, Indian forces conducted victorious campaigns against Pakistan under his command.
  • The Padma Vibhushan and Padma Bhushan, India's second and third highest civilian honors, were given to him.

Additional Information

• General Jayanto Nath Chaudhuri
  • He was a General Officer in the Indian Army. He served as the 6th Chief of Army Staff from 1962 to 1966 and the Military Governor of Hyderabad State from 1948 to 1949.
• General Paramasiva Prabhakar Kumaramangalam
  • He was among the last of the King's Commissioned Indian Officers trained in England in the Indian Army, and the last King's Commissioned Indian Officer to lead the Indian Army.
• General Kodendera Subayya Thimayy
  • He was a distinguished soldier of the Indian Army who served as Chief of Army Staff from 1957 to 1961 in the crucial years leading up to the conflict with China in 1962.

When unfolding the paper we get,

Hence, the correct answer is 'option 2'.