← MES Jr. Grade
Past Questions
Optical fibre works on the
A)
principle of refraction
B)
total internal reflection
C)
scattering
D)
interference
An optical fibre guides light by repeatedly reflecting it inside the core when the light strikes the core-cladding boundary at an angle greater than the critical angle. This phenomenon is called total internal reflection. Refraction alone does not keep light trapped in the fibre, and scattering or interference are not the operating principle.
Plants receive their nutrients mainly from
A)
chlorophyll
B)
atmosphere
C)
light
D)
soil
Plants obtain most of their mineral nutrients and water from the soil through their roots. Chlorophyll helps in photosynthesis, atmosphere provides carbon dioxide, and light supplies energy, but the main source of nutrients is soil.
In which year did terrorists crash two planes into New York’s World Trade Centre on September 11 in a sequence of destruction?
A)
2000
B)
2001
C)
2002
D)
2003
The terrorist attacks on New York’s World Trade Center took place on September 11, 2001, when hijackers crashed two planes into the towers. Therefore, option (b) 2001 is correct. The other years are incorrect because the event did not occur in 2000, 2002, or 2003.
The clear sky looks blue because of
A)
reflection of light
B)
refraction of light
C)
diffraction of light
D)
dispersion of light
The sky appears blue because sunlight is scattered by tiny particles in the atmosphere. In standard MCQ wording, this is often associated with dispersion of light among the given options, though the more precise scientific term is scattering (Rayleigh scattering). Reflection and refraction do not explain the blue color of the clear sky, and diffraction is not the main cause here.
A retired Delhi High Court Judge C.K.Mahajan was recently in the news because
A)
he was nominated to be the Indian Ambassador to Asian Development Bank (ADB)
B)
he will be the head of the working group to prepare a draft of the National Sports Development Code (NSDC)
C)
he is a new member of National Institution for Transforming India (NITI)
D)
he will be the head of the National Urban Health Mission (NRHM)
Retired Delhi High Court Judge C.K. Mahajan was in the news because he was appointed to head the working group set up to prepare a draft of the National Sports Development Code (NSDC). The other options refer to unrelated appointments or bodies: ADB ambassador, NITI member, and NRHM head do not match the news item.
Super conductivity is a phenomenon in which the resistance of a substance
A)
increases with temperature
B)
decreases with temperature
C)
does not change with temperature
D)
becomes zero at very low temperature
Superconductivity is the state in which a material shows zero electrical resistance when cooled below a certain critical temperature. So the resistance of the substance becomes zero at very low temperature. The other options are incorrect because superconductivity is not about a gradual increase, decrease, or constant resistance with temperature; it is specifically the disappearance of resistance below the critical temperature.
Which of the following is used in pencils?
A)
Graphite
B)
Silicon
C)
Charcoal
D)
Phosphorous
Pencils use graphite because it is soft, leaves a mark on paper, and can be rubbed off easily. Silicon is used in electronics, charcoal is not the standard material for pencil leads, and phosphorous is used in matches and other chemical applications, not pencils.
Lime is sometimes applied to soil in order to
A)
increase the alkalinity of the soil
B)
increase the acidity of the soil
C)
restore nitrates to the soil
D)
make the soil more porous
Lime (usually calcium oxide, calcium hydroxide, or calcium carbonate) is applied to acidic soil to neutralize excess acidity and raise the soil pH. So its main effect is to increase the alkalinity of the soil. It does not increase acidity, and restoring nitrates or making soil more porous are not its primary purposes.
Choose the odd one out in terms of dimensional unit
A)
Specific gravity
B)
Strain
C)
Stress
D)
None of these
Specific gravity and strain are both dimensionless quantities. Specific gravity is a ratio of densities, and strain is a ratio of change in length to original length, so neither has a dimensional unit. Stress, however, is force per unit area, so its dimension is M L^-1 T^-2. Therefore, stress is the odd one out.
The place of origin of an earthquake inside the surface of the earth is called its
A)
Seismos
B)
Shear centre
C)
Focus
D)
Epicentre
The point inside the Earth where an earthquake originates is called the focus (also known as the hypocentre). The epicentre is the point on the Earth's surface directly above the focus. 'Seismos' refers to shaking/earthquake-related terms, and 'shear centre' is not related to earthquakes.
The five permanent members of UN security council are
A)
Japan, West Germany, USSR, UK and USA
B)
Canada, China, France, USSR and USA
C)
Germany, China, USSR, UK and USA
D)
China, France, USSR, UK and USA
The five permanent members of the UN Security Council are China, France, Russia (formerly USSR), the United Kingdom, and the United States. Among the given options, (d) matches this list. The other options include countries that are not permanent members, such as Japan, West Germany, Canada, and Germany.
What is the function of a dynamo?
A)
To convert heat energy into light energy
B)
To convert light energy into heat energy
C)
To convert mechanical energy into electrical energy
D)
To convert electrical energy into mechanical energy
A dynamo is an electrical generator. It works on the principle of electromagnetic induction, converting mechanical energy (rotation) into electrical energy. Option (d) describes an electric motor, while (a) and (b) are unrelated energy conversions.
Logarithm tables were invented by
A)
John Napier
B)
John Doe
C)
John Harrison
D)
John Douglas
Logarithm tables were invented by John Napier, a Scottish mathematician, who introduced logarithms in the early 17th century to simplify multiplication and division. The other options are not associated with the invention of logarithm tables.
Which of the following states shares longest border with Bangladesh?
A)
Meghalaya
B)
Assam
C)
West Bengal
D)
Mizoram
West Bengal shares the longest border with Bangladesh among the given states. Although Meghalaya also has a substantial border with Bangladesh, West Bengal’s border is the longest. Therefore, the correct option is (c) West Bengal.
Celebration of National Voters Day on 25th January every year is a strategy to
A)
promote free and fair election nationwide
B)
encourage reducing the election related expenditures
C)
increase enrolment of voters
D)
discourage possible communalism in the politics
National Voters’ Day is celebrated on 25th January to encourage eligible citizens, especially new voters, to register and participate in the electoral process. It is a voter awareness and enrolment initiative of the Election Commission of India. Hence, the main strategy is to increase enrolment of voters. The other options are not the primary objective of National Voters’ Day.
The oath of office is administered to the Governor by the
A)
Chief Justice of India
B)
President
C)
Chief Justice of high court
D)
Speaker of Legislative Assembly
Under Article 159 of the Indian Constitution, the oath or affirmation of office is administered to the Governor by the Chief Justice of the High Court of that state. If the Chief Justice is unavailable, the senior-most judge of the High Court administers it. Therefore, option (c) is correct. The other options are incorrect because the President does not administer the oath to the Governor, and the Chief Justice of India or the Speaker of the Legislative Assembly have no such constitutional role.
Which city is known as ‘Electronic City of India’?
A)
Mumbai
B)
Hyderabad
C)
Guragon
D)
Bangalore
Bangalore is widely known as the ‘Electronic City of India’ because it is a major hub for the electronics, IT, and technology industries. The other options are not commonly known by this title: Mumbai is India’s financial capital, Hyderabad is known for IT and pharmaceuticals, and Gurgaon is known as a corporate and IT hub.
Indira Gandhi was assassinated in
A)
1974
B)
1984
C)
1994
D)
2004
Indira Gandhi, the then Prime Minister of India, was assassinated on 31 October 1984 by her bodyguards. Hence, the correct answer is 1984. The other options are incorrect because 1974, 1994, and 2004 do not match the year of her assassination.
Which of the following is not among the states approved by the Cabinet Committee on Economic Affairs (CCEA) for the creation of an Intra-state Transmission System (ISTS)?
A)
Maharashtra
B)
Tamil Nadu
C)
Gujarat
D)
Himachal Pradesh
The Cabinet Committee on Economic Affairs (CCEA) approved the creation of Intra-State Transmission Systems for renewable-energy related evacuation in selected states such as Maharashtra, Tamil Nadu, and Gujarat. Himachal Pradesh was not included in that approved list. Therefore, option (d) is correct.
Why others are incorrect:
- (a) Maharashtra — included in the approved states.
- (b) Tamil Nadu — included in the approved states.
- (c) Gujarat — included in the approved states.
- (d) Himachal Pradesh — not included.
The headquarters of the United Nations is at
A)
Geneva
B)
Paris
C)
New York
D)
Washington, D.C.
The headquarters of the United Nations is in New York City, USA. Geneva hosts major UN offices, but not the main headquarters. Paris is the headquarters of UNESCO, and Washington, D.C. is not the UN headquarters.
The 2012 Olympics Games were held in
A)
London
B)
Seoul
C)
Sydney
D)
Tokyo
The 2012 Olympic Games, officially the Games of the XXX Olympiad, were held in London, United Kingdom. Seoul hosted the 1988 Olympics, Sydney hosted the 2000 Olympics, and Tokyo hosted the 2020 Olympics (originally scheduled for 2020 but held in 2021).
Microphone is used to convert
A)
sound waves into electrical energy
B)
sound waves into light rays
C)
electrical energy into sound waves
D)
sound waves into magnetic currents
A microphone is a transducer that converts sound energy (sound waves) into electrical signals/energy. Option (b) is incorrect because microphones do not produce light. Option (c) describes a loudspeaker, which converts electrical energy into sound. Option (d) is incorrect because microphones do not convert sound into magnetic currents.
The term of office of the UN Secretary-General is
A)
three years
B)
four years
C)
five years
D)
six years
The UN Secretary-General is appointed by the General Assembly on the recommendation of the Security Council for a term of 5 years. The term is renewable. Therefore, the correct answer is five years. The other options are incorrect because the standard term is not 3, 4, or 6 years.
Who among the following is the chairman of the recently constituted 7th Pay Commission?
A)
Justice Ashok Kumar Mathur
B)
Dr.Rathin Roy
C)
Justice B.N.Srikrishna
D)
C.Rangarajan
The 7th Central Pay Commission, constituted in 2014, was chaired by Justice Ashok Kumar Mathur. Dr. Rathin Roy was a member, while Justice B.N. Srikrishna and C. Rangarajan were not chairmen of the 7th Pay Commission. Hence, option (a) is correct.
To which country does the present UN Secretary-General belong?
A)
Ghana
B)
South Korea
C)
Spain
D)
Sweden
The UN Secretary-General in 2015 was Ban Ki-moon, who belongs to South Korea. He served as the 8th Secretary-General of the United Nations from 2007 to 2016. Therefore, the correct option is (b) South Korea. Ghana, Spain, and Sweden are not the country of origin of the then current UN Secretary-General.