Indian Coast Guard Navik GD Mock Test - 2 - Indian Coast Guard Navik GD/DB MCQ

There should be 67 in place of 66.
Hence, Option D is correct. 

Let AB be the observation tower and h be its height.

Also, let the ship be at C when the angle of elevation is 30° and at D when the angle of elevation is 45°.

The time taken by the ship to travel from C to D is 10 minutes and we need to find out the time the ship will take to reach B from D.

∴ tan 30º = AB/CB = h / CB = 1/ √3

⇒ CB = √3 x h

∴ tan 45º = AB / DB = h / DB = 1

⇒ DB = h

⇒ CD = CB – DB = (√3h – h) = h(√3– 1)

Now, as h(√3 – 1) distance is covered in 10 minutes, a distance of h is covered in = 13.66 minutes = 13 minutes 40 seconds

According to given question,
Since Cost of x meters of wire is d rupees.

On the basis of question we draw a figure of a circle with centre O ,

Given , ∠AOD = 100°
We know that the angle subtended at the centre is twice to that of angle at the circumference by the same arc.

Again, ∠BOC = 70°

∴ ∠APC = 180° – 50° – 35° = 95°

Using Rule 1,
Part of tank filled by pipes A and B in 1 hour

Required time 

= 1 hour 12 minutes

Hence, Option B is correct.

There should be 199 in place of 201.
Hence, Option D is correct. 

Let AB be the building and the man is standing at A.

When the car is 200m away from the building, the angle of depression is 60°

tan 60° = BD/AB = √3

⇒ 200/AB = √3

⇒ AB = 115.47 m

⇒ tan30° =BC/AB = x/115.47 = 1/√3

⇒ x = 66.67

Now, the car travels distance CD in 8 seconds

 CD = BD – BC = 200 – 66.67 = 133.33 m

 Speed = 133.33/8 = 16.67 m/s

Let the number be x.

P (Amit) = 1/3

P (Vikas) = 2/7

P (Vivek) = 1/8.
Required Probability = 1/3 + 2/7 + 1/8 = 125/168.

Let the consecutive integers(even) be 2p and (2p + 2):
= (2p + 2)² - 2p² = (2p + 2 + 2p)(2p + 2 -2p)
= 2(4p + 2)
= 4 (2p + 1)
Therefore, divisible by 4.

Using Statement I : No value is given, thus it is insufficient.

Using Statement II :
x₂ – 9x + 20 = 0
(x – 4) (x – 5) = 0
x = 4, 5
p + 1 = 4 and 2q = 5
p = 3, q = 5/2
p + 1 = 5 and 2q = 4
p = 4 and q = 2
Multiple values are possible.
So, statement II alone is not sufficient.

Using both Statement I and II :
p + 1 = 4 and 2q = 5

p + 1 = 5 and 2q = 4
p = 4 and q = 2 (not possible)

So, both the statements are together necessary.
Hence, option D is correct.

Given: 
(7 men + 6 women) 5 persons are to be chosen for a committee.

Formula used:
ⁿC_r = n!/(n - r)! r!

Calculation:
Ways in which at least 3 men are selected;
⇒ 3 men + 2 women
⇒ 4 men + 1 woman 
⇒ 5 men + 0 woman 

Number of ways = ⁷C₃ × ⁶C₂ + ⁷C₄ × ⁶C₁ + ⁷C₅ × ⁶C₀
⇒ 7!/(3! × 4!) × 6!/(2! × 4!) + 7!/(4! × 3!) × 6!/(1! × 5!) + 7!/(5! × 2!) × 6!/(6!× 0!)
⇒ 35 × 15 + 35 × 6 + 21 
⇒ 735 + 21 = 756
∴ The required no of ways = 756.

From 9 pm to 12 am angle rotated = 90°
⇒ Angle rotated from 12 am to 6 am = 180°
⇒ Therefore , total angle rotated = (90 + 180)°
⇒ 270°
Hence Total angle rotated = 270° 

Upstream speed of the boat = 14 – 3 = 11 km/hr
Hence, Option D is correct.

Speed of the train – Speed of the man

So the answer = 9 + 3 = 12 m/s
Hence, Option D is correct.

Part of the tank filled in 1 hour by pipe A = 1/2
Part of the tank filled by both pipes in1 hour

So, Time taken to fill 2/3 part = 60 minutes
Time taken to fill 1/2 part

The tank will be filled at 11:45 A.M.

A's  speed  =(5*5/18) m/s = 25/18m/s.
Time taken by A to cover 100m  = (100* 18/25) sec.  =72 sec.
∴ B covers 92 m in (72+8) sec.= 80 sec.
∴ B's speed = (92/80)m/sec. = (92/80* 18/5) km/hr =  4.14km/hr

The phylum Mollusca comprises animals with soft bodies, often protected by a hard shell. Snails, clams, octopuses, and squids are examples of animals belonging to this phylum.

Fatty tissue, also known as adipose tissue, helps in keeping the body warm. Adipose tissue is a specialized type of connective tissue that primarily functions as a site for energy storage in the form of fat. It is rich in adipocytes, which store triglycerides. One of the important roles of adipose tissue is insulation and thermoregulation. The layer of fatty tissue under the skin acts as an insulating layer, reducing heat loss from the body and helping to maintain body temperature. The accumulation of fat in adipose tissue provides a source of stored energy that can be utilized during periods of increased energy demands, such as in cold environments.

White blood cells, also known as leukocytes, play a vital role in fighting infections and protecting us from diseases. They are an essential part of the immune system and are responsible for recognizing and attacking foreign substances, such as bacteria, viruses, and other pathogens. White blood cells are involved in various immune responses, including engulfing and destroying pathogens, producing antibodies, and coordinating immune reactions.

Lymph nodes are responsible for filtering foreign substances, such as pathogens and toxins, from the lymph fluid. They contain specialized immune cells that help identify and destroy these harmful substances.

The heart contains a tiny component called the atrioventricular (AV) node. The AVN or the atrioventricular node is located in the lower-left corner of the right atrium. It is located nearby the atrioventricular septum which separates the atria and the ventricles.

• The enzyme pepsin digests proteins. 
• Protein is the basic molecule in the human body.
• The proenzyme pepsinogen that is in contact with hydrochloric acid gets transformed into the active enzyme pepsin.
• Pepsin transformed proteins into peptones.

Calcium storage is not a function of the respiratory system. The respiratory system primarily deals with gas exchange and maintaining acid-base balance.

Spleen is referred to as a blood bank because it is cleaned the blood filtering and storing blood cells for an emergency situation like Hemorrhagic Shock Spleen is another name for the “graveyard of blood” as it purifies the blood by removing microbes and worn-out RBCs. The spleen is placed beneath the ribcage and much above the stomach (upper left of the abdomen) under the diaphragm.

Night blindness, also known as nyctalopia, is caused due to a deficiency of Vitamin A. Vitamin A is essential for maintaining healthy vision, especially in low-light conditions. It plays a crucial role in the functioning of the retina, which is the light-sensitive part of the eye responsible for night vision. A deficiency of Vitamin A can lead to impaired vision, particularly in dim light or darkness, and can manifest as night blindness. Consuming foods rich in Vitamin A or taking Vitamin A supplements can help prevent and treat night blindness.

Anemia is caused by a deficiency of iron in the body, leading to a decrease in the number of red blood cells or a decrease in hemoglobin levels. This results in reduced oxygen-carrying capacity in the blood, leading to fatigue, weakness, and pallor.