Indian Navy SSR Mock Test - 4 - Airforce X Y / Indian Navy SSR MCQ

The correct answer is 'Used all available means'.

Key Points

• Here, in the given sentence the idiom 'Left no stone unturned' means 'used all available means'.
• Leave no stone unturned: to do everything you can to achieve a good result, especially when looking for something.
  • Example: He left no stone unturned in his search for his natural mother.
• Therefore, as per the points mentioned above, we find that the correct answer is Option 2.​

Correct Answer: Used all available means.

Additional Information

• Let's look at the meaning and examples of some idioms of the word 'Play':

In the given sentence, ‘is being’ must be replaced with ‘has been’ to make the sentence grammatically correct. "Has been" is used in the third-person singular for the present perfect tense. The present perfect tense refers to an action that began at some time in the past and is still in progress. Hence, option (b) is correct.

The correct answer is "Option 3'.

Key Points

• In indirect speech, we report what someone said without using their exact words. The key points to consider when converting direct speech to indirect speech are:
• Pronouns: The pronouns need to be changed to reflect the perspective of the speaker in the reporting clause.
• In this case, since the student is speaking, the pronouns "I" and "her" need to be changed accordingly.
• The options that use "he/she" are correct in this regard.
• Tense changes: The tense of the verb in the reported speech needs to be shifted back.
• The verb "do not remember" in the direct speech should be changed to "did not remember" in the past tense in the indirect speech.

Therefore, the correct sentence is: 'The student told her that he/she did not remember her name.'

Additional Information

• Now, let's examine why the other options are incorrect:
  • Option 1 is incorrect because it uses "I" in the reported speech, which doesn't match the perspective of the student who is speaking.
  • Option 2 is incorrect because it uses "cannot remember" in the reported speech, which doesn't match the tense of the original statement.
  • Option 4 is incorrect because it uses "do not remember" in the reported speech, which doesn't match the tense of the original statement.

Correct answer: Option 1: ​I do not worry much about the effects of my actions

Key Points

• The most appropriate meaning of the underlined idiom is ​I do not worry much about the effects of my actions.
• Let the chips fall where they may: to do something without worrying too much about the after-effects.
  • Example: She promised to prepare for the CA exam and let the chips fall where they may.
• Thus, the correct answer is ​I do not worry much about the effects of my actions.
  

The correct answer is Theoretically tougher optional.

Key Points

• We use rather than to give more importance to one thing when two alternatives or preferences are being compared.
• Here in the sentence, The aspirant has two alternatives one is an easier one and another is a tougher subject, and When we have to choose from two items we use the comparative degree for that. (tougher)
• Also, we need the adverb before the adjective tougher as adverbs are the words that qualify adjectives, so Theoretically is the correct choice for that.
• Hence, option 1 is the correct answer.

Thus the correct sentence is: The aspirant has chosen the theoretically tougher optional subject rather than an easier one like political science.

Additional Information

Forming adverbs from adjectives

In most cases, an adverb is formed by adding -ly to an adjective.

Explanation:

• The longest wavelength of light visible to human eyes is of red color and it’s about 700 nm
• The shortest wavelength of light visible to the human eye is of violet color and it’s about 400 nm
• The ability of a telescope to form separable images of close objects is called its resolving power of a telescope.
• But the wavelength of X-ray is 10^-10m whereas gamma-ray has a wavelength of 10^-12 which is shorter than X-ray hence option c is not correct

The correct answer is A - 4, B - 1, C - 3, D - 2.

Key Points

Peptic ulcer

• A peptic ulcer is a lesion formed on the lining of the stomach, oesophagus, or small intestine.
• The most common causes include the bacteria Helicobacter pylori and the use of nonsteroidal anti-inflammatory drugs.
• Helicobacter pylori is a bacteria that can enter the body and can live in the digestive tract for many years.
• Soon or after many years they can cause sores known as ulcers.
• Most commonly it happens due to the damage of this lining by the stomach acids.
• Its helical shape is thought to have evolved in order to penetrate the mucoid lining of the stomach and thereby establish infection.
• It is also called a gastric ulcer. The most common symptom of this ulcer is pain in the abdomen and this pain worsens while eating.
• It is accompanied by vomiting, weight loss, or poor appetite.

Dengue

• Dengue is a viral disease and is carried by mosquito vectors
• It is a highly infectious disease and spreads very fast
• The mosquito responsible for carrying these disease is Aedes aegypti(female)
• Anopheles(female) is the carrier of malaria, which is a bacterial disease
• Culex is the common house mosquito and is known to carry diseases like Encephalitis.

Elephant foot (Elephantiasis):-

• It is a parasitic worm infection that can spread from person to person through mosquitoes.
• It is characterized by swelling legs. Elephantiasis is also known as lymphatic filariasis.

Malaria

• It is a disease caused by Plasmodium, a tiny Protozoan responsible for this disease.
• Malaria is an infectious disease spread by mosquitos that affect humans.
• It is characterized by symptoms such as fever, exhaustion, vomiting, and headaches.
• Different species of Plasmodium (P. vivax, P. malaria, and P. falciparum) are responsible for different types of malaria.
• Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal.
• The most serious and fatal form of malaria is caused by Plasmodium falciparum.
• The vector of Plasmodium is the female Anopheles mosquito which transfers the sporozoites (infectious form).
• Plasmodium requires two hosts to complete its life cycle- human and mosquito.
• The infected female Anopheles mosquito transfers the infectious form of Plasmodium, i.e., sporozites to the human body by biting.
• Antimalarial drugs such as quinine and chloroquine are used to treat the disease.
• Malaria can be prevented by killing mosquitoes by spraying DDT (Dichlorodiphenyltrichloroethane), BHC (benzene hexachloride), etc, and using insect repellents, mosquito nets, etc.

Explanation:

Uniform circular motion

• When an object follows a circular path at a constant speed, the motion of the object is called uniform circular motion.
• Since the velocity of the object is changing continuously in direction, the object undergoes acceleration.
• The acceleration of an object moving with constant speed v in a circle of radius R has a magnitude and is always directed towards the center.
• This is why this acceleration is called centripetal acceleration.

Equilibrium of a particle

• The equilibrium of a particle in mechanics refers to the situation when the net external force on the particle is zero*.
• According to the first law, this means that the particle is either at rest or in uniform motion. If two forces F₁ and F₂, act on a particle, equilibrium requires.
• F₁ = − F₂
• The equilibrium of a body requires not only translational equilibrium (zero net external force) but also rotational equilibrium (zero net external torque).

Impulse

• Impulse is the product of force and time which equals the change in momentum.
• Impulse = Force × time duration = Change in momentum.
• A large force acting for a short time to produce a finite change in momentum is called an impulsive force.
• The notion of impulse is useful when a large force acts for a short time to produce a measurable change in momentum.
• Since the time of action of the force is very short, one can assume that there is no appreciable change in the position of the body during the action of the impulsive force.

The correct answer is Option 4.

Key Points

• Global Positioning System
  • It is a satellite navigation system, used to determine the ground position of an object.
  • It is based on a network of satellites orbiting above the Earth. Hence, Statement 1 is correct.
  • It is based on the system of triangulation. Hence, Statement 2 is correct.
  • It is a U.S.-owned utility that provides users with positioning, navigation, and timing (PNT) services.
  • It is a network of 24 satellites that provides service to civilian and military users.
  • GPS receivers provide location in terms of latitude, longitude, and altitude. Hence, Statement 3 is correct.
  • The civilian service is freely available to all users on a continuous, worldwide basis. Hence, Statement 4 is not correct.
  • The military service is available to U.S. and allied armed forces as well as approved Government agencies.
  • GPS is based on time and the known position of GPS specialized satellites i.e distance-based technology.
  • GPS faces the problem of drifting due to continuous changes in the position of satellites, and weak signals due to thick clouds and tall buildings.
  • GPS has a voice system to guide the user.

Additional Information

• IRNSS
  • Presently, IRNSS consists of eight satellites, three satellites in geostationary orbit and five satellites in geosynchronous orbit.
  • IRNSS-1I is expected to replace IRNSS-1A, which was rendered ineffective after its three rubidium atomic clocks failed.
  • The main objective is to provide reliable position, navigation and timing services over India and its neighbourhood.
  • It works just like the established and popular US Global Positioning System (GPS) but within a 1,500-km radius over the sub-continent.
  • Technically satellite systems with more satellites provide more accurate positioning information.
  • However, compared to GPS (24 satellites) which has a position accuracy of 20-30 metres, the NavIC is able to give a pinpoint location with an estimated accuracy of under 20 metres.
  • It has been certified by the 3rd Generation Partnership Project (3GPP), a global body for coordinating mobile telephony standards.
  • It was recognised by the International Maritime Organization (IMO) as a part of the World Wide Radio Navigation System (WWRNS) for operation in the Indian Ocean Region in 2020.
  • ISRO is working to build the next generation of IRNSS satellites with indigenous atomic clocks and enhancements to navigation services.

The correct answer is The density of sodium is slightly more than water.

Key Points

• Sodium is a member of the alkali metal family with lithium and potassium.

• Sodium has a strong metallic lustre and in colour is very analogous to silver.

• It is soft at common temperatures that it may be formed into leaves by the pressure of the fingers.

• Sodium compounds soon tarnish on exposure to the air, though less rapidly than potassium.

• Sodium is instantly oxidized by water, and hydrogen gas is in temporary union with a little sodium being disengaged.

• We get sodium chloride (NaCl) when sodium bonds with chlorine (Cl). It is also used as a salt in fertilizers.

• Sodium is reactive, soft metal with a low melting point and most important of all alkaline metal from the commercial point of view. Sodium reacts rapidly with water, snow, and ice to produce sodium hydroxide.

Additional Information

• Sodium is an alkali metal it has a density of 968kg/m³
• The density of water is 997 kg/m³

The correct answer is the contraction of muscles in the wall of the food pipe.

Concept:

• The human digestive system consists of a long tubular structure called the alimentary canal and its associated digestive glands.
• The Alimentary canal can be divided into various compartments:
• (1) the buccal cavity, (2) the food pipe or oesophagus, (3) the stomach, (4) the small intestine, (5) the large intestine ending in the rectum and (6) the anus.

Explanation:

• The swallowed food moves downwards in the alimentary canal because of the contraction of muscles in the wall of the food pipe.
• When food enters the food pipe (oesophagus), the muscles in the wall of the oesophagus contract and relax alternately, producing a wave-like movement known as peristalsis.
• Food is pushed down by the movement of the wall of the food pipe.
• Actually, this movement takes place throughout the alimentary canal and pushes the food downwards.
• The smooth muscles of the alimentary canal also promote pushing down (away from the mouth) the food from the oesophagus by the movement peristalsis.

Dimensional Formula:

The dimensional formula is a method to express a derived quantity in terms of fundamental quantities whose dimensions are

Let Mass = M, Length = L and Time, = T .

The general dimensional formula for derived quantity is

[M^xL^yT^z]

Note: The power of M, L, T depends on the definition of Physical quantity.

Dimensional and Dimensionless Quantity:

• The physical quantity is known as a dimensional quantity which can be expressed in terms of the power of [MxLyTz]
• The physical Quantity is known as a dimensionless quantity that cannot be expressed In terms of powers of [MxLyTz]
• Ratios of the same type of physical quantities are also dimensionless quantities.

Angular Impulse:

• It is defined as the product of Torque and time.

Angular Impulse = M × t

Where,

M = torque

T = time

• Unit of angular impulse is N ms or

Torque:

• Torque is a twist or turn that tends to produce rotation.
• Torque is defined as the product of force and perpendicular distance from the axis of rotation.

M = P × r

Where,

M = Torque.

P = Applied force.

r = distance from the axis.

[M] = [P] × [r]

[M] = [

[M] = [

[Ang.Impl] = [M1L2T−2]× [T1]

[Angular impulse] = [

[M1 L2 T-1] is dimentionl formula of Angular Impulse.

The correct answer is Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.
Key Points

• Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.
• The term "unsaturated" means more hydrogen atoms may be added to the hydrocarbon to make it saturated (i.e. consisting of all single bonds).
• The example of the unsaturated compound is alkenes and alkynes, as well as branched chains and aromatic compounds.
• Saturated hydrocarbons have the molecular formula C_nH_2n+2, where n refers to the number of carbon atoms, and can be any natural number.
  • For example ethane

Additional Information

• Alkane - acyclic saturated hydrocarbon.
  • Alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon-carbon bonds are single.
• Alkene - any hydrocarbon containing one or more double bonds.
  • Alkenes unsaturated compounds
• Alkyne - any hydrocarbon containing one or more triple bonds.
  • Alkenes unsaturated compounds

Concept:

• SHM (Simple harmonic motion): The type of oscillatory motion in which the restoring force on the system is directly proportional to the displacement of the system is called SHM.
• The general expression for the simple harmonic equation is given by:

⇒ X = A sin ωt (when started from the mean position)

⇒ X = A cos ωt (when started from the extreme position)

• The amplitude of SHM (A): The maximum displacement from the mean position.
• frequency (f): The no. of oscillations in one second.
• Time period (T): The time taken to complete one oscillation.
• Here in this case the particle moves from an extreme position to half of the amplitude
• Angular frequency (ω) of SHM is given by :

⇒ X = A cos ωt = A cos ()

• Where A is the amplitude of SHM, ω is the angular frequency and t is time, and T is the time period.

Calculation:

Given Data:

• Amplitude (A) = 9 units,
• Time Period (T) = 4 sec,
• Let the time taken by the particle in going from the extreme position to half the amplitude is t
• The Displacement from an extreme position to half the amplitude is half of the total amplitude (∴X = A/2)

​∴ X = A cos ωt

 = A ⋅ cos () [ ∵ X = ]

 = 9 × cos 2πt4

∴ cos^-1  =

∴  =

∴ t =  second​

Explanation:

 = sin  ----(∵ sin^-1(−12) = )

= sin [π3+π6]

= sin

= sin

= 1

The value of  is 1.

The correct answer is option (4).

The correct answer is option 1.

Given: lim_{x → 0+}

Calculation:

⇒ lim_{x → 0+}

⇒

We know,

⇒

⇒

⇒

⇒

⇒ 1

Hence, the value of given expression is 1.

Concept Used:-

The following formula of integration of function and its derivative will be used to solve the given problem,

Here f(x) is a function, f'(x) is the derivative of the function and C is constant.

Explanation:-

Given,

⇒ ex dx = f(x) ex + c

It can be written as,

⇒​ex dx = f(x) ex + c

Here, (-1/x²) is the derivative of (1/x). Thus, Integrate the left-hand side using the above-mentioned formula and simplify it further,

⇒ (1/x).ex + c = f(x) ex + c

On comparing both the sides, we get,

⇒ f(x) = 1/x

So, the value of f(x) is 1/x.

The correct answer is option (1).

Given:

x² + y² = π²

y = sin x

Calculation:

We have,

⇒ x² + y² = π² is a circle of radius π and center at the origin.

Required area = Area of the circle (1st quadrant) - ∫0πsinxdx

⇒ Required Area =

⇒ Required Area =

⇒ Required Area =

⇒ Required Area =

⇒ Required Area =  sq. units

∴ The required area is sq. units.

Given :-

If A =  and I = .

Concept used :-

since every matrix satisfies its characteristics equation.

Solution :-

We have A = [21 3−1] , its characteristics matrix is

its characteristics equation is

since every matrix satisfies its characteristics equation

⟹A2−A−5I=0

Product of two numbers = HCF × LCM
1280 = 8 × LCM
160 = LCM

R means + and S means –

12 R 23 S 32 = 3 → 12 + 23 – 32 = 3

And

13 S 34 R 56 = 35 → 13 – 34 + 56 = 35

Thus,

23 R 65 S 45 = 23 + 65 – 45 = 43

Hence, 43 is the correct answer.

The correct answer is Kathakali.

Key Points

• Kathakali​
  • The literal meaning of the word Kathakali is Story-Play.
  • Kathakali is based on the epics of Ramayana and Mahabharata.
  • It is a classical dance related to Kerala.
  • In this dance, there are nine facial expressions called Navarasas.

Additional Information

• Kathak:
  • ​The term Kathak is derived from Katha which means Story.
  • The Kathaks were originally a caste of storytellers in the temple of north India, who embellished their performances with gestures and songs.
  • Kathak began evolving into a distinct mode of dance in the fifteenth and sixteenth centuries with the spread of the bhakti movement.
  • The legends of Radha Krishna were enacted in folk plays called Rasa Lila, which combined folk dance with the basic gestures of the Kathak storytellers.
• Manipuri
  • The Manipuri Dance, also referred to as the Manipuri Raas Leela (Meitei: Jagoi Raas, Raas Jagoi), is one of the eight major Indian classical dance forms, originating from the state of Manipur.
  • Lai Haraoba is the earliest form of dance in Manipur, and it forms the basis of all such dances.

Given :

Statement given : W # Q @ T & Y @ M % K

So,

• W # Q → W is the mother of Q.

• Q @ T → Q is the son of T.

• T & Y → T is the brother of Y.

• Y @ M → Y is the son of M.

• M % K → M is the wife of K.

​

Thus, according to the final family tree K is the father-in-law of W.

Hence, "Father-in-law" is the correct answer.

The direction for this question is mentioned below-

Hence, 2 Km is correct answer.

The logic followed here is:

Consider A as Plus.

Then,

14 A 13 A 3 = 30

→ 14 + 13 + 3 = 30.

and,

39 A 14 A 3 = 56

→ 39 + 14 + 3 = 56.

Similarly,

28 A 11 A 4 = ?

→ 28 + 11 + 4 = 43.

Hence, the correct answer is "43".

Given: Today is Tuesday.

We know that every 7th day is going to be Tuesday.

No. of odd days = 100 / 7 = 2 (Remainder)

Now if today is Tuesday then after 100 days, the day will be the same as 2 days after today so,

Then, the day after 100 days = The day after 2 days from today = (Tuesday + 2) = Thursday.

Hence, the correct answer is "Option 4".

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)".

Key Points

• Chanakya was the minister of Chandragupta Maurya.
• He assisted Chandragupta Maurya in the establishment of the Mauryan Empire by defeating Dhannanda.
• His real name was Vishnugupta, he adopted the name Chanakya as the son of Chanak and wrote the book Arthashatra in the name of Kautilya.
• He is considered a pioneer of politics and economics in India.
• His book Arthasashtra still has significance in the modern world.
• He told seven elements of a state which are:
  • Swami (The Ruler)
  • Amatya (The Minister)
  • Janapada (The Population)
  • Durga (The Fortified Capital)
  • Kosha (The Treasury)
  • Danda (The Army)
  • Mitra (Ally and Friend)

The correct answer is Mumbai

Key Points

​Kala Ghoda

• Kala Ghoda is a famous art festival celebrated in Maharashtra State.
• It is Mumbai's famous street art festival.
• In the city of Mumbai, a plethora of famous festivals is held. One of them is the Kala Ghoda Arts Festival.
• The first time, this festival was celebrated was in 1999, and the festival has become, one of the largest ethnic and multicultural festivals in the city.

Additional InformationOther state festivals