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n examination failed

Only In Bengali = 17 -5= 12%

Only In English =18 -5= 13%

In both subject = 5%

Total students failed = 30%

Percentage of passed students = 100-30= 70%

The correct answer is parabolic concave mirror.

Key Points

• Concave mirrors are spherical mirrors that curve inward like a spoon.
• They create the illusion of largeness.
• For a diverging or concave mirror, the focal length is always negative.
• Concave Mirror used for Shaving mirrors, Ophthalmoscope, Astronomical telescopes, Solar furnaces, etc.
• A concave mirror is used for this purpose because it produces a parallel beam of light when the light source is present at its principle focus.
• The headlight is present at focus and after reflection, it gives a parallel ray of light on the road.

Important Points

The correct answer is A - 3, B - 4, C - 1, D - 2.

Key Points

• Kangsabati River rises from the Chota Nagpur plateau.
• It passes through the districts of Purulia, Bankura, and Paschim Medinipur in West Bengal and draining in the Bay of Bengal.
• Tista and Karala rivers are flowing beside Jalpaiguri town.
• Source: Tso Lhamo Lake (Sikkim).
• Mouth: Brahmaputra.
• The Ganges River is a 1569 mile long river flowing across India and Bangladesh into the Bay of Bengal.
• The Source of The Ganga river is Himalayas' Gangotri Glacier.
• The Source of the Hooghly river is the Ganga river and the mouth in the Bay of Bengal.
• Ganga Basin including Sundarban Area (74,732 km²).
• The Ganges River flows through several states including Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, and West Bengal.
• The Ganges River's main tributaries include Ramganga, Gomti, Ghaghara, Gandaki, Burhi Gandak, Koshi, Mahananda, Yamuna, Tamsa, Son, and Punpun.
• Torsa River rises from the Chumbi Valley in Tibet, China, where it is known as Machu.
• It flows into Bhutan, where it is known as the Amo Chu.
• Mouth: Brahmaputra.

The correct answer is Sheikh Hasina.

• Prime Minister of Bangladesh Sheikh Hasina, be honored with the prestigious Global Women’s Leadership Award 2018 in Sydney, Australia.
• The Global Summit of Women focuses on women's advancement in the global economy and has been connecting women worldwide for 27 years.

Important Points

• Nirmala Sitharaman is the Minister of Finance of India, the second woman Finance Minister.
• Nirmala Sitharaman was the second woman to hold the post of Defence Minister after Indira Gandhi and the first to hold this office full time.
• H. E. Joyce Banda, a Malawian politician who served as vice president (2009–12) and president (2012–14) of Malawi.
• She was the first woman to serve as head of state anywhere in Southern Africa.
• Sushma Swaraj is the former Minister of External Affairs of India.
• She was the second woman to hold the office, after Indira Gandhi.
• She served as the first female Chief Minister of Delhi for a short period in 1998.
• She is the first and only female MP till date to be honored with the 'Outstanding Parliamentarian Award' in 2004.

The correct answer is Little Boy.

Key Points

• On August 6, 1945, during World War II, the United States dropped an atomic bomb on the city of Hiroshima, Japan.
• The bomb was known as "Little Boy", a uranium gun-type bomb that exploded with about thirteen kilotons of force.
• The bombing of Hiroshima, codenamed Operation Centerboard I, was approved by Curtis LeMay on August 4, 1945.
• The B-29 plane carried Little Boy.

Important Points

• Three days after the United States dropped an atomic bomb on Hiroshima, a second atomic bomb was dropped on Nagasaki on August 9, 1945.
• A 21-kiloton plutonium device known as "Fat Man”.
• The B-29 "Bockscar", piloted Major Charles Sweeney, was assigned to deliver the "Fat Man".

Key Points

• On 16 July 1945, U.S. scientists working on the 'Manhatten Project' successfully detonated the first-ever nuclear explosion in the ‘Trinity’ test at Alamogordo, New Mexico.

According to the given information, the pattern followed here is:

First a particular falls ILL, then visits a doctor, then consults with doctor, then takes treatment, and the last step is recovery.

So the sequence will be Illness < Doctor < Consultation < Treatment < Recovery

Hence, the correct answer is "2, 3, 1, 4, 5".

Hint

As Illness is first, no need to check all the options.

The correct answer is Paleontology.

• Paleontology is the study of the history of life on Earth as based on fossils.
• Fossils are the remains of plants, animals, fungi, bacteria, and single-celled living things that have been replaced by rock material or impressions of organisms preserved in rock.

Important Points

• List of some field of study:

Given:

Quotient = 76

Remainder = 536

Formula Used:

Dividend = Divisor × Quotient + Remainder

Calculation:

Let the Divisor be x

⇒ 76x+536 = 43628

⇒76x = 43628-536

⇒76x = 43092

⇒x = 43092÷76

x = 567

Given:

Speed \(=\left(45 \times \dfrac{5}{18}\right)\) m/sec \(=\left(\dfrac{25}{2}\right)\) m/sec

Time = 30 sec.

Formula Used:

 Distance = Speed × Time

Calculation:

Let the length of bridge be x metres.

\(\dfrac{130+x}{30}=\dfrac{25}{2}\)

⇒ 2(130 + x) = 750

⇒ x = 245 m.

Length of bridge will be 245 metres

The correct answer is Birbal.

• The theory of Din-i-Ilahi was introduced by Mughal Emperor Akbar.
• It is based on Monotheism, which means belief in one God.
• The first initiated disciples of Din-i-Ilahi during emperor Akbar included Birbal, Prince Salim, and Abul-Fazl ibn Mubarak.

Important Points