Indian Navy SSR Mock Test - 10 - Airforce X Y / Indian Navy SSR MCQ

CONCEPT:

• Bohr’s Model: Niels Bohr by making 4 postulates solved the puzzle of hydrogen spectra.
  • The mass of the nucleus is very large compared to that of the electrons and almost the entire mass of the atom is concentrated in the nucleus and hence assumed to be infinite.
  • The electrons revolve around the nucleus in circular orbits.
  • The mass of the electron remains constant.
  • The radius around the orbit has some special values of the radius. In these stationary orbits, they do not radiate energy as expected from Maxwell’s laws.
  • The energy of each stationary orbits are fixed, electrons can jump from a higher orbit to a lower orbit by emitting a photon of radiation. Where Higher energy orbit – Lower energy orbit = (h c)/λ
    • An electron can also jump from lower to higher energy by absorbing energy.
  • In stationary orbits, the angular momentum L of an electron is an integral multiple of (h/2π)
    • L = n × (h/2π)

EXPLANATION:

• From the above, it is clear that all the above conditions are true. Hence option 4 is correct.

carboxylic acid contains -COOH group.

Concept: 

Here we have used concept of AND, and NAND gate concepts.

If two inputs A, B are connected in And gate then the output can be written as: Y = A.B   ----- (1)

In the case of the NAND gate when we connect two inputs A and b then output is: 

Calculation:

Given:

Here in this circuit, we have labeled it as 1,2,3 part of circuit having outputs Y1, Y2, and C. 

Y1 = solution of first two input NAND gate, Y2 = solution of second two input NAND gate

C = solution of third AND gate connecting both NAND gates as two inputs

From the circuit diagram, we can see that 

when B = 0 then C = 1, B= 1 then C = 0 so that solution is completely independent on A.

So, the truth table is: 

 

Concept:

​Magnetic flux:

• It is defined as the number of magnetic field lines passing through a given closed surface.
• It provides the measurement of the total magnetic field that passes through a given surface area.
  
• Formula, ϕ = BA cosθ , where B = magnetic field, A = area, θ = angle between the area and magnetic field
• The relation between the magnetic flux and current is given as, ϕ = LI, where L = self-inductance, I = current​

Calculation:

Given,

self inductance, L = 100 mH, current, I = 8 mA

The magnetic flux linked with each turn of the coil is given as,

ϕ = LI

ϕ = 100 × 10^-3 × 8 × 10^-3

ϕ = 8 × 10^-4 Wb

Hence, the magnetic flux linked with each turn of the coil is 8 × 10-4 Wb.

The correct answer is option 4) i.e. 20 m/s

CONCEPT:

Kinematic equations of motion:

• These equations define the relationship between initial velocity u, final velocity v, time t, and displacement s of an object with respect to its motion in uniform acceleration a.
• Following are the three kinematic equations for uniformly accelerated motion:

⇒ v = u + at

⇒ s = ut + 0.5at2

⇒ v2 - u2 = 2as

CALCULATION:

Given: Height, s = 20 m

• Since the ball attains a maximum height, therefore the final velocity v = 0 m/s
• The ball was thrown approximately with an upward velocity of

⇒ v2 - u2 = 2as

⇒ 02 - u2 = -2 × 10 × 20

⇒ u² = 400

⇒ u = 20 m/s

CONCEPT:

Elements of a Communication System:

• Irrespective of the nature of the communication system, every communication system has three essential elements:

1. Transmitter
2. Medium or channel
3. Receiver

• In a communication system, the transmitter is located at one place, the receiver is located at some other place (far or near) separate from the transmitter and the channel is the physical medium that connects them.
• Depending upon the type of communication system, a channel may be in the form of wires or cables connecting the transmitter and the receiver or it may be wireless.
• The purpose of the transmitter is to convert the message signal produced by the source of information into a suitable form for transmission through the channel.
• If the output of the information source is a non-electrical signal like a voice signal, a transducer converts it to an electrical form before giving it as an input to the transmitter.
• When a transmitted signal propagates along the channel it may get distorted due to channel imperfection.
• Moreover, noise adds to the transmitted signal and the receiver receives a corrupted version of the transmitted signal.
• The receiver has the task of operating on the received signal. It reconstructs a recognizable form of the original message signal for delivering it to the user of information.
• There are two basic modes of communication:
  1. Point-to-point
  2. Broadcast

Point to point communication:

• In point-to-point communication mode, communication takes place over a link between a single transmitter and a receiver.
• A telephone call is an example of such a mode of communication.

Broadcast communication:

• In the broadcast mode, there are a large number of receivers corresponding to a single transmitter.
• Radio and television are examples of broadcast modes of communication.

EXPLANATION:

• We know that when a transmitted signal propagates along the channel it may get distorted due to channel imperfection. Hence, option 1 is correct.

Concept:

General term: General term in the expansion of (x + y)ⁿ is given by

Middle terms: The middle term is the expansion of (x + y) ⁿ depending upon the value of n.

• If n is even, then the total number of terms in the expansion of (x + y) ⁿ is n +1. So there is only one middle term i.e.th term is the middle term.

=

• If n is odd, then the total number of terms in the expansion of (x + y) ⁿ is n + 1. So there are two middle terms i.e.  are two middle terms.

Calculation:

Here, we have to find the coefficient of the middle term in the binomial expansion of 

Here n = 8 (n is even number)

∴ Middle term = 

Hence, middle terms or 5^th term will be,

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:

If first terms and common difference of AP are 'a' and 'd' respectively, then

n^th term of Ap:

T_n = a + (n - 1)d

Sum of n terms of AP:

Note: If d > 0, AP will be increasing and d < 0, AP will be decreasing.

Therefore, this is the decreasing series and sum will be maximum if its last term is positive or zero.

Let there are n positive terms, where T_n is n^th term then

Hence, we will take 31 terms for maximum sum.

Hence, sum of 31 terms of AP is given by

Hence, option 2 will be correct.

Integrating both sides, 

∴ The correct answer is option (2).

Calculation:

Let O be the observer (neglecting height of observer), C be the centre of balloon of radius r. The rough diagram as shown below:

Given: ∠AOB = α; ∠COD = β

To find: length of CD

Now we know that, OC bisects ∠AOB.

So, ∠COB = α/2

Let C and D be the position of the aeroplanes.
Given that CB = 900 m,∠CAB = 60°,∠DAB = 45°
From the right △ ABC,
Tan45 = CB/AB => CB = AB
From the right △ ADB,
Tan30 = DB/AB => DB = ABtan30 = CBx(1/√3) = 750/√3
CB = CD + DB
=> Required height CD = CB - DB = 750 - 750/√3 = 250(3 - √3)

The correct answer is 1943, Singapore.

Key Points

• Subhash Chandra Bose established the 'Provisional Government of Free India' in Singapore in the year 1943.
• On July 4, 1943, Rash Behari Bose handed over the command of Azad Hind Fauj to Subhash Chandra Bose in a ceremony held at Cathay Bhawan, Singapore.
• The Azad Hind government was established on 21 October 1943.
• Japan recognized the Azad Hind government on 23 October 1943.
• Japan gave Andaman and Nicobar Islands to Azad Hind Government.
• Subhash Chandra Bose renamed Andaman as Shaheed Dweep and Nicobar as Swaraj Dweep.
• Subhash Chandra Bose was the Prime Minister, Foreign Minister and Defense Minister of India's first independent government.
• Finance Department to S.C. Chatterjee, Publicity Department to S.A. Iyer and the women's organization was handed over to Captain Lakshmi Swaminathan.

• The governments of 9 countries had given their recognition to the Azad Hind government, in which countries like Germany, Japan, Philippines were included.

The correct option is Swimming.

Key Points

• The term Butterfly is associated with Swimming.
  • The Butterfly swimming is accompanied by the butterfly kick which is also known as the "dolphin kick".
  • Backstroke, breaststroke, and butterfly stroke are terms related to swimming.

Additional Information

Other Important Terms:

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 correct answer is "Kolkata Port".

Key Points

• The British East India Company built it, making it the oldest continuously running port in India.
• The port, historically regarded as the most significant port in the nation, continues to be the most important port and is appropriately known as the entrance to Eastern India.

Additional Information

• Port Blair Port:
  • With a population of about 100,000, Port Blair serves as the Andaman and Nicobar Islands' capital and main city.
  • Along with other small islands that were originally inhabited by British colonists, such as Corbyn's Cove, Wandoor, Ross Island, Viper Island, and others, Port Blair is also well-known for its historic Cellular Jail.
• Visakhapatnam Port:
  • ​There are 13 main ports in India, and Visakhapatnam Port is the only one in Andhra Pradesh.
  • By the number of goods handled, it is the third-largest state-owned port in India and the biggest on the Eastern Coast.
  • On the Bay of Bengal, it is about halfway between the ports of Chennai and Kolkata.
• Paradip Port:
  • ​It is a significant seaport for trade in India.
  • The region is a popular tourist destination due to the allure of the sea, a fantastic sea beach and marine drive, lovely streams, estuaries, and evergreen woods of estuarian islands of the river Mahanadi.

The correct answer is Option 3.

Key Points

• The Government of India awarded him the fourth highest civilian honour of the Padma Shri, in 2008, for his contributions to Sattriya dance.
• Sattriya dance is a classical dance form that originated in the Indian state of Assam.
• It is one of the eight major classical dance forms of India.
• Sattriya dance is closely associated with the Sattras, which are Vaishnavite monasteries in Assam.

Additional Information

• Bharatanatyam is one of the oldest classical dance forms of India and originated in the southern state of Tamil Nadu.
  • It is a highly expressive and intricate dance style that combines graceful movements, intricate footwork, hand gestures (mudras), facial expressions, and storytelling.

• Kathak is a classical dance form of India that originated in the northern regions, particularly in the states of Uttar Pradesh and Rajasthan.

  • It is known for its rhythmic footwork, intricate gestures, fast spins, and expressive storytelling.

  • Kathak has both Hindu and Muslim influences, as it evolved as a blend of the Hindu temple traditions and the Persian and Mughal court dance traditions.

  • The word "Kathak" is derived from the Sanskrit word "katha," which means story. Thus, Kathak is often referred to as the "dance of storytelling" because it emphasizes narrative elements through mime, facial expressions, and body movements.

• Manipuri dance is one of the classical dance forms of India, originating from the northeastern state of Manipur.

  • It is known for its grace, fluidity, and devotion to the theme of Radha and Krishna, the divine lovers from Hindu mythology.

  • Manipuri dance is deeply rooted in the religious and cultural traditions of Manipur and has a rich history that dates back centuries.

The correct answer is 4.

Important Points

• Based on historical seismic activity, the Bureau of Indian Standards has categorized regions in India into four seismic zones: zones II, III, IV and V.
• Of these, the most seismically active area is Zone V and the least active is Zone II. 
• There is a history of devastating earthquakes on the Indian subcontinent.
• The key cause for the high frequency and severity of earthquakes is that the Indian plate is driving into Asia at a rate of roughly 47 mm/year.
• India's geological figures indicate that about 54 percent of the land is prone to earthquakes.
• Research by the World Bank and the United Nations predicts that by 2050, about 200 million urban dwellers in India will be vulnerable to storms and earthquakes.
• The most recent edition of India's seismic zoning map given in India's earthquake-resistant design code [IS 1893 (Part 1) 2002] assigns four degrees of seismicity in terms of zone factors for India.
• In other words, unlike its previous edition, which consisted of five or six zones for the region, India's earthquake zoning map divides India into four seismic zones (Zone 2, 3, 4, and 5).
• According to the new zoning map, the maximum degree of seismicity is predicted in Zone 5, while the lowest level of seismicity is correlated with Zone 2.

Revised earthquake hazard zone map of India

The Indian Air Force (IAF) is set to conduct ‘Gagan Shakti-2024’, the nation’s largest air military exercise, involving all Air Force stations. Held every five years, it will commence on April 1, 2024, at Pokhran’s field firing range. Approximately 10,000 airmen will participate, with maneuvers spanning the Western and Northern fronts. The Indian Army is aiding logistical support, ensuring synergy across sectors for operational rail mobilization.

Archaeologists in Pompeii unearthed a black-walled banqueting hall adorned with vibrant frescoes depicting Greek mythology. Pompeii, a preserved ancient Roman city near Naples, Italy, lies at the base of Mount Vesuvius. Established in the Bronze Age, it thrived under Roman rule, boasting a population of 10-12,000. Buried by Vesuvius in 79 CE, Pompeii remained hidden until rediscovery in 1748. Its remarkably preserved state offers profound insights into Roman life, earning it UNESCO World Heritage status.