RRB JE (Railways Junior Engineer) CBT CE Full Test - 1 Free Online Test

Fineness modulus of an aggregate is an indicator of the mean size of particles. The coarser the particle, the higher the fineness modulus.

• In γ-emission rays ( Gamma rays), no changes occur in the mass/charge.
• Gamma rays are electromagnetic waves of short wavelength and high frequency.
• They are emitted by most radioactive sources along with alpha or beta particles
• Through releasing a gamma photon it reduces to a lower energy state. Hence, Gamma rays have no electrical charge connected with them.
• Alpha rays are released by high mass whereas beta has high energy electrons.

Overtaking zones are provided when OSD cannot be provided throughout the length of the highway. These are zones dedicated for overtaking operation, marked with wide roads.

The desirable length of overtaking zones is 5 times OSD and the minimum is three times OSD.

• The Centripetal force is required to maintain a body in Uniform Circular Motion.
• Centripetal Force acts when a body moves around the other body, the force that causes this acceleration and keeps the body moving along a circular path is acting towards the centre

Basic capacity: The basic capacity is the maximum numbers of passenger cars that can pass a given point on a lane or a roadway during one hour under the most ideal roadway and traffic conditions that can possibly be attained.

Possible capacity: It is the maximum number of vehicles that can pass a given point on a lane or roadway during one hour under the prevailing roadway and traffic conditions.

Practical Capacity: It is the maximum number of vehicles that can pass a given point on a lane or roadway during one hour with creating unreasonable delay under the prevailing roadway and traffic conditions.

Design capacity: it is the practical capacity or a smaller value determined for use in designing the highway to accommodate the design hourly volume.

Theoretical Capacity: It is the number of vehicles passing any point in one hour per lane.

• The quantum mechanical state of an electron is identified by the following quantum numbers:

1. Denoted by n, the principal quantum number is always an integer and describes the electron's state.
2. The Orbital quantum number / azimuthal quantum number is denoted by l and is associated with the angular momentum (L) of the electron due to its orbital motion. It is given by

           l = n - 1

     3.  The energy of an electron in a hydrogen atom is affected by a strong magnetic field and the quantum number which describes this magnetic effect is called magnetic quantum number. It is denoted by m_l.

     4.   Denoted by m_s, the spin quantum number is associated with the intrinsic angular momentum of the electron.

In order to convert pan evaporation value into lake evaporation value a pan coefficient is used.

Lake evaporation = Pan Coefficient (C_p) × Pan Evaporation

A maximum number of vehicles can be parked at 90^o parking angle.

This 90^o parking angle causes obstruction to the road traffic particularly if the road width is less. But, it can accommodate the maximum number of vehicles for a given kerb length.

Fifth Generation (Present and Future):

• 5th generation computers use ULSI (Ultra-Large Scale Integration) chips
• Millions of transistors are placed in a single IC in ULSI chips
• 64-bit microprocessors have been developed during this period
• Memory chips and flash memory up to 1 GB, hard disks up to 600 GB & optical disks up to 50 GB have been developed
• Fifth generation computing devices, based on Artificial Intelligence, are still in development, though there are some applications, such as voice recognition, that is being used today

Notes:

Energy resources can be classified into two categories:

1. Renewable source (Non-conventional energy)
2. Non-Renewable source (Conventional energy)

Renewable energy resources are natural resources which can be regenerated continuously and are inexhaustible. They can be used again and again in an endless manner. Examples are Wood, Solar energy, wind energy, hydropower, tidal energy, geothermal energy, Biomass Energy etc.

• Biomass Energy: Energy produced by organic matter like plants and animals are called Biomass Energy
• Examples of biomass are wood, crop residues, seeds, cattle dung, sewage, agricultural wastes etc
• Biogas and biofuel are examples of biomass energy

Non-Renewable energy resources are natural resources which cannot be regenerated once they are exhausted. They cannot be used again. Examples are Oil, Coal, petroleum, natural gas, nuclear fuels etc.

• Sarojani Naidu became the first Indian women president of the Congress at the Kanpur session in 1925.
• She was the first woman to become the governor of Uttar Pradesh.
• She began writing at the age of 13. Known as the Nightingale of India, she eulogised India in her poems published in three collections, The Golden Threshold (1905), The Bird of Time (1912) and the Broken Wing (1917).

Newton’s law of gravitation states that each body in this universe attracts every other body with a force, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. The direction of the force is along the line joining the particles.

Incineration is a method in which disposal of refuse is carried out by burning it at high temperature either in presence of oxygen.

Composting is the method of disposal of refuse, in which decomposition can be carried out either in presence or absence of oxygen.

Pyrolysis is a method in which the disposal of refuse is carried out by burning it at high temperature either in absence of oxygen.

Pulverization refers to the action of crushing and grinding of heavier solids into the lighter solids.

Shredding refers to the action of cutting and tearing of heavier solids into the lighter solids.

Adjustment of Tilting Level:

Principal line:

1. The line of sight
2. The axis of the level tube

Adjustment of WYE Level:

1. The line of sight and
2. The axis of the level tube
3. The axis of collars
4. The vertical axis through the spindle of the level

Magnesia:

A good brick earth should contain a small quantity of magnesia (about 1%)

Magnesium in brick earth imparts yellow tint to the brick.

It is responsible for reducing shrinkage

Excess of magnesia leads to the decay of bricks.

• Carbon dioxide is the emission/emission from coal combustion at thermal power plants.
• Along with carbon dioxide, sulphur dioxide and nitrogen dioxide are also gaseous emissions which leads to global warming and acid rain.
• These emissions are formed due to the combustion process when coal is burned to produce heat.
• However, emissions depend on the quantity of coal used and the amount of sulphur present in the coal.

Beam overhanging on both side

D_s = 0

Fixed beam

D_s = 3

Continuous beam

D_s = 3

Two – hinged arch

Hence, overhanging beam would be determinate structure.

Screed:

The "floating" screed is free to pivot about its pin connections. This pin connected tow-arm arrangement enables the screed to be self-leveling and gives it the ability to compensate for irregularities in the underlying surface.

Mat thickness, which is controlled by the screed or the screed can be tied to a specified grade using sensor tracing a straight line.

Gross Irrigation Requirement, GIR = 

The gross amount of water to be applied to the field will be 

• Novak Djokovic defeated Rafael Nadal to win his 7^th Australian Open Men’s Singles title at Melbourn.
• The resurgent world No. 1 outplayed the second-ranked Nadal 6-3, 6-2, 6-3 in a largely one-sided match.
• In Women’s Singles, Japan’s Naomi Osaka clinched her maiden Australian Open Grand Slam Singles title in Melbourne.

• Malaysia has become the 124th member of the International Criminal Court (ICC).
• The ICC is the world's only permanent war crimes court and aims to prosecute the worst abuses when national courts are unable or unwilling.
• The headquarters of International Criminal Court is in The Hague, Netherlands.
• Malaysia's capital is Kuala Lumpur and its currency is Malaysian Ringgit.

Coefficient of velocity for mouthpiece, C_v = 
Therefore,
Theoretical velocity = 
Theoretical velocity = 
Theoretical velocity = 10.5 m/s

• Moment of Force is defined as the rotational effect of a force on a body about an axis of rotation and its unit is Newton metre. 
• Centripetal Force acts towards the centre of the circular path in which a body is moving. 
• Impulse is the product of force and time since it is the reaction when a large force acts on a body for a very small time. 

So, shear stress distribution across a circular section is parabolic.

With the increase of y, the shear stress decreases.

At y = R, τ = 0

At y = 0, τ = τ max

So, at neutral axis, the shear stress is maximum.

USB root hub is the software driver that connects multiple USB peripherals to the computer. Root hub is connected to the processor through Bus.

Length of transition curve is given by:

C = rate of change of radial acceleration = 30 m/sec³

Function of Lateral ties-

1. to resist buckling and strengthen bond.

2. to bind longitudinal reinforcement and proper distribution of concrete.

Providing lateral ties at the proper spacing confines concrete (like gripping the concrete enclosed between the lateral ties) thereby preventing pieces of failed concrete from falling away.

The transverse reinforcing bars are provided to ensure that every longitudinal bar nearest to the compression face has effective lateral support against buckling.

In an element the complimentary shear stress is always equal in magnitude but opposite in sign.

Concept:

Consider a rectangular block ABCD as displayed in following figure. Now assume a set of shear stresses (τ) of opposite direction, as displayed in following figure, is applied over the opposite surfaces of rectangular block i.e. AB and CD.

If we consider the effect of this set of shear stresses (τ) of opposite direction, we can easily say that there will be zero net force acting over the rectangular block but there will be one couple acting over the rectangular block in clockwise direction.

In order to balance the rectangular block, there must be one more couple of similar intensity acting over the rectangular block in opposite direction i.e. in anti-clockwise direction. Therefore, there will be one more set of shear stresses (τ’) of same intensity acting over the rest two opposite surfaces of rectangular block and this set of shear stresses will be termed as complementary shear stress.

Benefits of the ribbed slab

These slabs are more flexible, light in weight, floor depth is very thin, excellent vibration control, good thermal insulation can be achieved, durable, acoustically insulated, and fire resistance. These slabs are generally used in a plain ceiling.

Therefore, all of the given options are correct.

Drainage Co-efficient (D.C)

The depth of water drained off from a given area in 24 hours is called the drainage co-efficient or it can be defined as the design capacity of the drainage system and is typically expressed as a depth of water removed in 24 hours.

D.C.= 6.912 × 10^−3m = 6.912mm
Therefore, the drainage coefficient of the land will be 7 mm.