BSF Sub Inspector (SI) Mock Test - 6 - BSF SI/ASI MCQ

So the answer = 30 × 63 = 1890 meters
Hence, Option D is correct.

[(x)^2]^1/3]1/4

= [(x²)^1/12]

= x^1/6

2D definition - A two-dimensional (2D) object is an object that only has two dimensions, such as a length and a width, and no thickness or height.  Since the plane figure has no thickness or height so it will be 2d figure.

Hence, Option B is correct.

Runs → A : B = (16 – 1) : 16 = 15 : 16

Hence, Option A is correct.

Given that, p = ab² = a × b × b
and q = a³b = a × a × a × b
∴ LCM of p and q = LCM (ab²,a³b) = a × b × b × a × a = a³b²
[Since, LCM is the product of the greatest power of each prime factor involved in the numbers].   

AP: 10, 6, 2, …
a = 10, d = - 4
Sum of first n terms = S(n) = (n/2) x [2a + (n – 1) x d]
S5 = (5/2) x [2 x (10) + (5 – 1) x (-4)]
= (5/2) x [20 + 4 x (-4)]
= (5/2) x (20 – 16)
= (5/2) x (4)
= 5 x 2
= 10

The correct answer is 120 dB.

• The loud noises that continue for a prolonged period can cause High blood pressure, Eardrum damage, and Nervous breakdown.
• Noise is unwanted and undesirable sound or noise, an irritant, and a source of stress.
• The sound level meter is used for measuring the intensity of sound.
• The transport sector contributes the maximum noise.
• The roadway noise can be reduced by the use of noise barriers, limitation of vehicle speed, and alteration of roadway surface texture.
• Sound is measured in decibels.
• Noise pollution is considered to be caused by sounds louder than 120 decibels.
• The decibel scale is used for measuring the loudness of sound or noise.
• According to the research, noise pollution is the highest in a low-income neighbourhood.
• The level of sound during normal conversation is 60 dbA.
• The allowed noise level by World Health Organisation (WHO) in residential areas is 50 decibels.
• Noise pollution affects marine animal's behaviour.
• The main source of noise pollution is Heavy machinery and Transportation equipment.

• Assertion (A): The rupee is widely accepted as a medium of exchange in India.


• Reason (R): It is authorized by the government of the country.

• Assertion (A) is correct: The rupee is indeed widely accepted as a medium of exchange in India. It is the official currency of the country and is used for all transactions.


• Reason (R) is also correct: The rupee is authorized by the government of India as the legal tender for transactions. It is issued and regulated by the Reserve Bank of India, which is the central monetary authority in the country.


• R is the correct explanation of A: The reason why the rupee is widely accepted as a medium of exchange in India is because it is authorized and backed by the government. The government ensures its stability and acceptance in the economy.

• Pollution is any undesirable change in physical, chemical, or biological characteristics of air, land, water, or soil.
• Agents that bring about such an undesirable change are called pollutants.
• Pollution can be broadly classified into 4 types - Air pollution, Water pollution, Noise pollution & Soil pollution.

Important Points

• Water pollution occurs when there is an addition of undesirable substances into water bodies.
• The sources of water pollution can be divided into 2 major groups:
  • Point source - It refers to the single identifiable sources like discharge pipes from a factory or sewage plant.
  • Non-point source - It refers to sources that do not originate from a single point. Example - agricultural run-offs.
• Factories and sewage treatment plants have proper drainage pipes leading to a water body for disposing their wastes and thus they are point sources of water pollution.
• Urban and Suburban lands cause water pollution by the field run offs and thus do not originate from a single point. Hence, they are non-point sources of water pollution.

The correct answer is Refrigerators.

Important Points

• Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. Mostly used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants.
• Chlorofluorocarbons or CFCs are strong ozone-depleting substances. They are widely used in Refrigerator, Air conditioner.
• How they affect the environment:
  • They remain in the atmosphere for a long period of time 
  • They enter the stratosphere from the troposphere, disintegrating slowly by the action of UV radiation and thus releasing Chlorine(Cl) radicals which cause Ozone depletion.
  • One Chlorine atom has the capability to destroy over 4000 molecules of Ozone(O₃) in one month.
• Montreal Protocol-1987
  • The Montreal Protocol is the most effective international environmental treaty to phase out the Ozone Depleting Substances from the atmosphere.
  • Came into force in 1989.
  • It successfully curbed the 98% production of chlorofluorocarbons.
• Kigali Agreement-2016
  • It is an amendment to the Montreal protocol
• Paris Agreement-2015
  • It is an international agreement to combat climate change. 

Any restriction imposed on the free flow of trade is a trade barrier. Trade barriers can either be tariff barriers (the levy of ordinary negotiated customs duties in accordance with Article II of the GATT) or non-tariff barriers, which are any trade barriers other than tariff barriers
Tax on imports is an example of Trade Barrier.

There are structural issues like lack of appropriate facility at primary centres, delays in referring patients [to specialists] and lack of transportation which lead to high infant deaths.” IndiaSpend analysed health data from 13 states to understand why so many infants and children die across the country.

Hence the correct answer is option B.

Hence the correct answer is option C.

When the plastic limit of soil is greater than the liquid limit, then the plasticity index is reported as zero.

A plate load test is used to determine are bearing capacity of foundations and settlement of foundations.

- Cantilever 7

- Simply supported 20

- Continuous 26

* For spans above 10 m, the values may be multiplied by 10/span in meters, except for the cantilever, columns in which case deflection calculations should be made.

Hence the option B is correct.

Sludge digestion, also known as anaerobic digestion, involves anaerobic decomposition. This process occurs in an oxygen-free environment where microorganisms break down organic matter in the absence of oxygen. So, option 2, anaerobic decomposition, is the correct choice. This process is commonly used in wastewater treatment plants to break down organic solids, producing biogas as a byproduct.

Total force on system FT​ = 2F − F = F (Left side)

Mass of system M = 2m

Acceleration of two mass system is a = f/2m towards left free body diagram is

N cos 60 − F = ma

N = 3F

Normal reaction acting between two blocks = N = 3F

Hence, option (D) is the correct answer.

To control cracking in beams with a total depth ˃ 750mm, sidebars are provided in the side faces of the beam. The distribution of these bars is over a distance of two-third of the beam's overall depth measured from its tension face.

Hence, the correct option is (D)

Hence, the correct option is (D)

Hence, the correct option is (A).

The high-velocity jet issuing from the nozzle then strikes a series of suitably shaped buckets fixed around the rim of a wheel.

The buckets change the direction of the jet without changing its pressure. The resulting change in momentum sets buckets and wheel into rotary motion and thus mechanical energy is made available at the turbine shaft.

Important impulse turbines are: Pelton wheel, Turgo - impulse wheel, Girad turbine, Banki turbine and Jonval turbine, etc., Pelton wheel is predominantly used at present.

Whereas In Reaction Turbine, a part of the total available hydraulic energy is transformed into kinetic energy before the water is taken to the turbine runner. A substantial part remains in the form of pressure energy.