Indian Navy MR Mock Test - 2 - Airforce X Y / Indian Navy SSR MCQ

Time zones Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude and is not adjusted for daylight saving time. It is effectively a successor to Greenwich Mean Time (GMT). There are countries having their separate time zones. Based o the UTC time zone the world is divided into 24 time zones.

Speed of sound is maximum in solids. Sound is a mechanical wave that needs a medium to travel.

• The velocity of sound waves in steel is 5920 m/s.
• The velocity of sound waves in air is 330 m/s.
• The velocity of sound waves in a vacuum is zero.
• The velocity of sound waves in water is 1480 m/s.

A lithium-ion battery is a type of rechargeable battery available in markets. It is commonly used for portable electronics and electric vehicles. Batteries used in mobile and smartphones are lithium-ion batteries. Smartphone batteries work at a voltage of 3.8 volts.  A cell uses a chemical reaction to produce electricity. A number of cells connected together are called a battery.

Given:
11% of 14% of 154
By simplification we get

= 2.3716

We know that,
sin²θ + cos²θ = 1

Ethane is an example of a saturated carbon compound. Saturated hydrocarbons are carbon compound that contains only single bonds between carbon atoms. Ethane is a colorless, odorless gas. Ethane is isolated on an industrial scale from natural gas and as a petrochemical by-product of petroleum refining. The chemical formula of Ethane is C₂H₆. Ethane can be found underground in liquid form in rock formations.

Given:
Set of observations:5,8,8,16,24,24,30,16,24
Clearly, 24 is most occurring in the given observation.
So, the mode is 24.

Changing the shape of the body will not affect velocity of the body.

• The rate of change of displacement is called velocity. Velocity is a vector quality, which has both magnitude and direction.
• SI Unit of velocity is m/sec. It may be positive or negative.
• If a body is moving on a circular then after completing one complete cycle, its average velocity is zero.

Power (P): Measures of the rate of work done is called power.
Work done is measured as the force on a body times the distance through which that force is applied.
Work done (W)= Force (F)× Distance (s)

Gravitational force is responsible of objects falling back on Earth, revolution of Earth around Sun and Moon around Earth. It allows everything in the Universe to be in controlled motion. 
Gravity is not a dissipative force since no energy is lost from a system when motion takes place. Further it is also very weak force. 

Given:
Number of books 21, 8, 28, 13, 19, 34, 27, 14, 37, 6.
Formula Used:
Arrange the observations in ascending order.
1) If the number of observations (n) is odd, then the median is the middle value, which is at position [(n+1)/2].
2) If the number of observations (n) is even, then the median is the average of the two middle values.
Calculation:
Number of observations 10 (even observations)
Number of books 21, 8, 28, 13, 19, 34, 27, 14, 37, 6
Arrange in ascending order 6, 8, 13, 14, 19, 21, 27, 28, 34, 37.
∴ the median number of books based on the data given = The average of the two middle values.
⇒ Median = (19 + 21)/2 = 20.

Given:
A wall is 24 m long, 8 m high and 60 cm thick
brick is  24 cm × 12 cm × 8 cm
10% of the wall is made of slurry
Formula:
Volume of Cuboid = Length × height × breadth
Concept used:
Volume of the Wall = Number of bricks × Volume of the brick
Calculation:
Volume of the Wall = Number of bricks × Volume of the brick
if 10% of the wall is made of slurry then only 90% of the wall is made of bricks
let N be the number of bricks
24 m × 8 m × 60 cm × 90% = N ×  24 cm × 12 cm × 8 cm
1m = 100cm
2400cm × 800cm × 60 cm × (90/100) = N ×  24 cm × 12 cm × 8 cm ( 1m = 100cm)
N = 45000
The number of bricks is 45000.

Given:
A 250 meters long train crosses a bridge 750 meters long in 20 seconds
And crosses a platform in 15 seconds.
Formula Used:
Distance = Speed × Time
Calculation:
Let the speed of the train be S
And let the length of the platform be x
According to the question,
250 + 750 = S × 20
⇒ S = 1000/20
⇒ 50 m/sec
Now, Again according to the question
The train crosses the platform in 15 seconds
250 + x = 50 × 15
⇒ x = 750 - 250
⇒ x = 500 m
∴ The length of the platform is 500 m.

• As the deep diving vessels are enclosed by water on all sides, equal pressure is exerted from each side.
• Thus, these vessels have to withstand opposed to high crushing pressure from all directions.
• A deep-submergence vehicle (DSV) is a deep-diving crewed submersible that is self-propelled.
• The Alvin, a human-occupied submersible, can carry two scientists and a pilot to a depth of about 15,000 feet.

• The atmospheric pressure will decrease as height rises.
• Two things account for this:
  • The primary cause is gravity. Air is drawn as near to the surface as it can be by the gravity of the Earth.
  • Density is the second reason. The number of gas molecules in the air decreases with height, making the air less dense than air closer to sea level.

Given:
At simple interest, an amount becomes Rs. 1120 in 4 years and Rs. 1200 in 5 years
Formula used:
SI = (P × R × T)/100
A =  P + SI
Calculation:
Interest in (5 - 4) years = 1200 - 1120 = Rs. 80
Interest in 1 year = Rs. 80
Interest in 4 years = 4 x 80 = 320
Amount in 4 years = 1120
Principal = Amount - Interest = 1120 - 320 = Rs. 800
∴ The principal amount is equal to Rs. 800.

Given:
If the monthly salary of an employee is increased by 8/3%, he gets Rs. 72 more.
Calculation:
8/3% = 8/300
⇒ 2/75
So, if his salary is 75 then his salary is increased by 2
Here,
2 = Rs. 72
⇒ 1 = Rs. 36
So, 75 = 36 × 75
⇒ Rs. 2700
∴ His monthly salary (in Rs.) is 2700.

Given:- Sum of numbers = 19, difference between two numbers = 3
To find:- Smaller number
Concept used:- Finding solutions of equations
Calculations:- Let the two numbers be a and b, where a > b
Sum of numbers = 19
⇒ a + b = 19 --------------------(i)
Difference between numbers = 3
⇒ a - b = 3 ----------------------(ii)
on subtracting the equation (ii) from (i),
⇒ (a + b) - (a - b) = 19 - 3
⇒ 2b = 16
⇒ b = 8 (smaller number)
.·. The smaller number out of the given two numbers is 8.

Acid:

• An acid is a substance which
• Is sour to taste.
• Turns blue litmus paper into red.
• Contains replaceable hydrogen.
• Gives hydrogen ion (H+) in an aqueous solution.
• Can donate a proton.
• Can accept an electron

• Molar mass is defined as the mass of a substance for a given amount.
• The amount of molecules or atoms or compounds present in one mole of a substance is given by this.
• Mass of Carbon = 12 u
• Mass of Hydrogen = 1 u
• The molar mass of ethyne
  • C₂H₂ = (2 x 12 + 2 x 1) = 26 u
• The molar mass of ethyne = 26 g
• Molar mass SI unit is g/mol.

The weight of an object does not remain the same everywhere, its value depends on the acceleration due to gravity (g). The value of acceleration due to gravity on Earth is considered to be 9.8 m/s². The value of g on the Moon is 1/6 times the value of g on Earth. This is the reason why the weight on the Moon is very less compared to the Earth. The value of g on the Sun is about 27 times the value of g on Earth. The mass of the Moon is less than that of the Earth, due to which the Moon exerts less force of attraction on the objects. The weight of the object on the Moon is 1/6 only one-thousandth of the weight of the Earth. For example, if the weight of a person is 60 kg on the earth, then the weight of that person on the moon will be 60 × (1/6) = 10 kg.

Given,
x − y = 2 and xy = 24
By squaring, we get
(x − y)² = 2²
⇒ x² + y² − 2xy = 4
⇒ x² + y² − 2 × 24 = 4
⇒ x² + y² = 4 + 48
⇒ x² + y² = 52

Due to refraction, sound is heard at a greater distance in the night than in the day.
Sound does not travel fast in hot air and does not travel far in cold air. The heating from the day will heat the entire atmosphere. At night, the atmosphere always cools from the ground up. When we have a thunderstorm at night, sound bounces off of that warm layer and has nowhere else to go but down and to our ears. So the sound is heard clearer and louder at night.

The direction of heat flow between two bodies depends on their temperatures. Heat always flows from a body at a higher temperature to a body at a lower temperature. Temperature is the measure of the amount of internal energy of particles.

Given: 
Cost of 2 Cows and 3 Horses = Rs. 4000
Costs of 3 Cows and 2 horses = Rs. 3500
Forming the equations with C for cow and H for horses:
2C + 3H = 4000----(1)
3C + 2H = 3500-----(2)
On solving equation (1) and equation (2) , we get,
C = 500 & H = 1000
∴ The cost of one cow is Rs.500.

The theory of relativity was proposed by Albert Einstein.
It states that space and time are relative and all the motion must be relative to a frame of reference. It is a notion that states, laws of physics are the same everywhere. This theory is simple but hard to understand. It states there is no absolute reference frame on can measure velocity if the object or momentum is only in relation to other objects. The speed of light is constant irrespective of who measures it or how fast the person measuring it, is moving.

The Khilafat movement started in Lucknow in 1919. A Khilafat Committee was formed in Bombay in March 1919. Mohammed Ali and Shaukat Ali brothers as well as several Muslim leaders started discussions with Mahatma Gandhi to explore the possibility of joint public action on this issue. Mahatma Gandhi also participated in the Kolkata session of the Congress in September 1920.

Tetanus is a bacterial disease. It is also known as "lockjaw" as it causes stiffness in the jaw muscles.
The causative agent of Tetanus is Bacteria Clostridium tetani.

The Lai-Haroba festival is mainly celebrated in the state of Manipur.
The festival represents the worship of traditional deities and ancestors and is one of the most joyous festivals of Manipur. It is indeed the most exquisite and colorful of the Manipuris. This festival is a splendid combination of religious singing, traditional songs and dances. It is observed by the people of Manipur in the month of May in honor of the local deity Umang Thai. This much awaited festival of Manipur celebrates the process of creation and twelve events show the stages of creation. The festival is also the ripe time to perform the Lion Dance, which marks the birth of the Lord.

The full form of "VLSI" is Very Large Scale Integration.
Very Large Scale Integration (VLSI) is the process of creating an integrated circuit (IC) by combining millions of MOS transistors onto a single chip. VLSI began in the 1970s when MOS integrated circuit chips were widely adopted, enabling complex semiconductor and telecommunication technologies to be developed.