Bihar Police SI Mains Paper 2 Mock Test - 1 - Bihar Police SI MCQ

Uttaramerur inscription was mentioned by Prime Minister Modi recently. This inscription was created during the reign of Parantaka Chola I (907-953 AD)
The walls of the Vaikunda Perumal Temple in Uttaramerur are inscribed with details revealing systems of local governance from the 10th century CE.

Combustion or Burning:

• Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat
• Waste like plastic and rubber tires can be burned using this combustion process
• These make use of the heat energy generated by the combustion & incineration process to electricity
• It is the most effective method of waste disposal at reducing the volume of solid waste
• It is not an acceptable practice, as it creates lots of pollution and it is harmful to both the environment as well as organisms

Important Points:

Recycling:

• It is the process of converting waste materials into reusable objects to prevent waste
• The materials from which the items are made can be reprocessed into new products
• Recycling such material saves the product and it also reduces the amount of manufacture to make new products
• It also helps in energy saving and reducing global climate change

Landfill or Burying:

• Landfill refers the disposal of waste material by burying it
• It is extended storage area for non-biodegradable waste
• Landfill is an area, which prevent contamination from the waste entering the area surrounding by soil and water and it also helps to reduce odour and pests

Composting:

• Due to lack of adequate space for landfills, biodegradable yard waste is allowed to decompose in a medium designed for the purpose
• Only biodegradable waste materials are used in composting
• Good quality environmentally friendly manure is formed from the compost and can be used for agricultural purposes

The zombie virus is related to global warming and the thawing of Arctic permafrost. The rising temperatures caused by global warming have led to the thawing of previously frozen ice, which could unleash “zombie viruses”. The zombie virus is an amoeba virus that scientists have revived from the melted ice. The new strain has one of 13 viral genomes, with Pandoravirus yedoma, 48,500 years old, being the longest frozen virus to become infectious. Scientists are developing an Arctic surveillance system to detect and contain outbreaks.

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.

The Bombay Stock Exchange (BSE) as its combined market capitalization reached ₹400-lakh crore for the first time. This reflects the growing valuation and strength of the BSE in the financial market, showcasing a substantial increase from previous milestones like ₹200-lakh crore.

D is the correct option.The Rigveda is the largest of the four Vedas, and many of its verses appear in the other Vedas. ... Brahmin · Kshatriya · Vaishya · Shudra.The first mention of Varna Vaishya is found in the Purusha Suktam verse of the ancient Sanskrit Rig Veda.

• Statement-I is correct: The migration of Jains to South India during the great famine in Magadh played a crucial role in spreading Jainism in the region.
• Statement-II is correct: This migration and subsequent developments contributed to the establishment and prominence of the Digambara sect in South India. However, the Digambara sect's establishment was more directly related to doctrinal differences and practices, such as the practice of nudity, which became a point of contention.
• While Statement-II is related to the effects of the migration, it is not the direct explanation for the spread of Jainism as mentioned in Statement-I but rather a consequence of the split that occurred within Jainism following the migration and the return of some Jains to Magadh.

Underemployment is a measure of employment and labor utilization in the economy that looks at how well the labor force is being utilized in terms of skills, experience and availability to work. Labor that falls under the underemployment classification includes those workers who are highly skilled but working in low paying or low skill jobs and part-time workers who would prefer to be full-time. This is different from unemployment in that the individual is working but is not working at his full capability.

Solar energy - Greenhouse effect - Incorrect

• The term ‘Greenhouse effect’ has been derived from a phenomenon that occurs in a greenhouse.
• A greenhouse looks like a small glasshouse and is used for growing plants, especially during winter.
• In a greenhouse, the glass panel lets the light in but does not allow heat to escape.
• Therefore, the greenhouse warms up, very much like inside a car that has been parked in the sun for a few hours. 
• The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of Earth’s surface and atmosphere.
• Solar energy is trapped by the earth atmosphere and radiates slowly so as to cover our earth with a warm blanket.
• This is the natural process of the greenhouse effect on earth to maintain its temperature and makes the earth perfect for life.
• Without the greenhouse effect, the average temperature at the surface of Earth would have been a chilly –18°C rather than the present average of 15°C.
• Carbon dioxide, methane and water vapour are the major greenhouse gases that absorb the infrared radiation from the Earth and re-emit it.
• It is not caused due to solar energy but due to greenhouse gasses.

Thus, the solar energy-greenhouse effect is not the correct pair.

Additional Information

Fossil fuel-burning - Release of CO₂ - Correct

• Carbon dioxide (CO₂) is released into the atmosphere by respiration, the burning of fossil fuels for energy.
• In recent years, their quantities have increased significantly due to the burning of fossil fuels.
• The increased amount of CO₂ in the air is mainly responsible for global warming.

Nuclear power - Radioactive wastes - Correct

• Initially, nuclear energy was hailed as a non-polluting way of generating electricity.
• Later on, it was realised that the use of nuclear energy has very serious inherent problems i.e. the generation of radioactive waste.
• Safe disposal of radioactive wastes is important in nuclear power energy factories.
• Improper disposal of nuclear waste can cause serious physical and biological deformities in living organisms when directly exposed to them. 

Biomass burning - Release of CO₂  - Correct

• Biomass burning means the burning of living or dead vegetation.
• It happens during land cleaning in the agriculture process when crops are out of the field.
• In this process, a high amount of CO₂ is released into the environment.

Krishnadevaraya (also Krishna Deva Raya) was the most important king of Vijayanagar Empire. He believed in the principle that a crowned king should always rule with an eye towards dharma.

The Chandra Shekhar Government was indeed supported by the Congress from the outside, but Chandra Shekhar did not command a majority in the Lok Sabha.

A is the correct option.The Sangam period, or Sangam Age is the period of history of ancient Tamil Nadu and Kerala and parts of Sri Lanka (then known as Tamilakam) spanning from c. 6th century BCE to c. 3rd century CE.
Erythraean Sea refers to Korkai as Colchis and Ptolemy, an Egyptian geographer calls it Kolkhai. Multiple classical works of the Sangam literature. 
 

The correct answer is A-IV, B - I, C - II, D - III.

The correct match:

Additional Information

• Nitrogen (N₂) is a colourless, odourless and tasteless gas that makes up 78.09% (by volume) of the air we breathe.
• It is nonflammable and it will not support combustion.
• Chlorofluorocarbon formerly used as a refrigerant and as a propellant in aerosol cans.

Jawaharlal Nehru, India's first Prime Minister, played a vital role in India's active involvement in the United Nations.

Given number: 

5934162

New number after digits are arranged in descending order:

9654321

Thus we can see only position of one digit is remain unchanged.

Hence, the correct answer is "One".

The logic followed is:

Given code: "MANIPUR is written as NBOJQVS" 

Similarly,

Thus "PATTERN will be written as "QBUUFSO".

Hence, the correct answer is "QBUUFSO". 

P, Q, R, S, T, V, W, and Z are sitting around a circle facing at the centre not necessarily in this same order.

i) T is second to the right of R who is third to the right of P.

Mistake Points

Who is used for the second person in a connecting statement.

For example: 

T is second to the right of R who is third to the right of P.

Here, who is used for R and not for T.

ii) S is second to the left of P and fourth to the right of Q.

iii) V who is not an immediate neighbour of P. (This means V cannot sit immediate left or right of P).

iv) Z is third to the right of V 

Thus we can see S is immediate left of Z.

Hence, the correct answer is "Option 3".

Given:

The ratio of the present age of Annu and Raj = 4 : 5

Then after 8 years ratio of their age = 5 : 6

Calculation:

Let be assume the present age of Annu and Raj is 4x and 5x respectively

⇒ (4x + 8)/(5x + 8) = 5/6

⇒ 24x + 48 = 25x + 40

⇒ x = 8

⇒ The age of Annu = 4x = 4 × 8 = 32

⇒ The age of Raj = 5x = 5 × 8 = 40

∴ The required result will be 32 years, and 40 years respectively.

Hence. the person will be allowed to appear in the interview.

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)

HCF is 23. So the other two numbers would be,
(23 * 13) and (23 * 14).
Thus Larger Number = 23 * 14 = 322.

Since A, B and C are the angles of a Δ,
∴ A + B + C = 180° .................... (1)
According to question,
A – B = 15° ;
⇒ A = B + 15°...................(2)
B – C = 30°;
⇒ B = C + 30°;....................(3)
Put the value of B from equation (2) in Equation (1), we will get
∴ A = B + 15°
A = C + 30° + 15°
A = C + 45° ......................(4)
From a equation,
∴ A + B + C = 180°
⇒ (C + 45°) + (C + 30°) + C = 180°
⇒ 3C + 45° + 30° = 180°
⇒ 3C = 180° – 75° = 105°
⇒ C = 35° ...........................(5)
From equation (4)
A = C + 45°
Put the value of C from equation (5) , we will get
∴ ∠A = 35° + 45° = 80°.

v₁ = speed in first half

D = total distance traveled = 50 km

d₁ = distance of the first half = 25 km

t₁ = time taken in first half

t₁ = d₁ /v₁

t₁ = 25/v₁                                                 (1)

for the second half :

v₂ = speed in second half = v₁ + 10

d₂ = distance of the second half = 25 km

t₂ = time taken in second half

t₂ = d₂ /v₂

t₂ = 25/(v₁ + 10)                                          (2)

given that :

t₁ - t₂ = 5/60                        (5 min in h = 5/60 h)

(25/v₁ ) - (25/(v₁ + 10)) = 5/60

v₁ = 50 km/h

Area of Rectangle = product of length and breadth (L * B)
Area of Parallelogram = A = ½ × d₁ × d₂ sin (y) where d1 & d2 are diagonal and y is the angle of intersection of diagonal.
 
Area of Trapezium = 1/2(sum of parallel sides)*height. 

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

Total surface area of a cylinder = πr²+2πrh+πr²=2πr(r+h)

Kalu’s speed = 3 m/s.
For 1200 m, Kalu would take 400 seconds and Sambhu would take 10 seconds less. Hence, 390
seconds.

The HCF and LCM of two numbers are 12 and 924.
Let the numbers be 12p and 12q where p and q are prime to each other.
∴ LCM = 12pq
∴ 12pq = 924
⇒ pq = 77
∴ Possible pairs are (1 , 77) and (7 ,11)
Hence , required answer is 2.