Science & Technology – UPSC Prelims PYQs

Which are the materials generally employed as solder in soldering operation in electronics?

To which one of the following processes is the term CMYK related?

Consider the following statements:

1. ELISA test is employed as the first and most basic test for an individual to detect cancer.
2. Almost 50% of human beings have Rh+ blood while the remaining have Rh- blood.

Which of the statements given above is/are correct?

Which one of the following is printed on a commonly used fluorescent tube light?

Consider the following statements :

1. Anhydrous sodium carbonate is commonly known as baking soda
2. Baking soda is used in fire extinguishers
3. Bleaching powder is manufactured in Hasenclever plant

Which of the statements given above is/are correct?

Consider the following statements :

1. A geostationary satellite is at an approximate height of 10,000 km
2. FM transmission of music is of very good quality because the atmospheric or man-made noises which are generally frequency variations can do little harm.

Which of the statements given above is/are correct?

What is the order of magnitude of electric resistance of the human body (dry)?

Pneumoconiosis afflicts the workers who work mainly in

Which one of the following pairs is not correctly matched?

Who among the following invented Lasers?

Consider the following statements :

1. During the process of osmosis, the solvent travels from the concentrated solution to the dilute solution.
2. In the reverse osmosis, external pressure is applied to the dilute solution.

Which of the statements given above is/are correct?

Consider the following statements :

1. The Headquarters of the International Organization for Standardization are located in Rome
2. ISO 9000 relates to the quality management system and standards.
3. ISO 14000 relates to environmental management system standards.

Which of the statements given above is/are correct?

Assertion (A): Existence of human life on Venus is highly improbable.

Reason (R): Venus has extremely high level of carbon dioxide in its atmosphere.

Assertion (A): All the proteins in our food are digested in small intestine only.

Reason (R): The protein-digesting enzymes from pancreas are released into small intestine.

Assertion (A): Amoeba reproduces by fission.

Reason (R): All unicellular organisms reproduce by asexual methods.

Assertion (A): The main constituent of the Liquefied Petroleum Gas is methane.

Reason (R): Methane can be used directly for burning in homes and factories where it can be supplied through pipelines.

Assertion (A): The person with diabetes insipidus feels thirsty.

Reason (R): A person with diabetes insipidus suffers from excess secretion of vasopressin.

Consider the following statements :

1. Vigyan Rail is a Science Exhibition on wheels organized by the Council of Scientific and Industrial Research.
2. Vigyan Prasar is an autonomous body under the Ministry of Human Resource Development.
3. EDUSAT, the ISRO’s educational satellite was launched from French Guyana in 2004.

Which of the statements given above is/are correct?

Match List-I (Atomic Power Plants/Heavy Water Plants) with List-II (State) and select the correct answer using the code given below the lists :

1. Andhra Pradesh
2. Gujarat
3. Maharastra
4. Maha
5. Karnataka

List-I (A) Thal (B) Manuguru (C) Kakrapar (D) Kaiga

List-II (State)

Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?

Which one of the following diseases of milching animals are infectious?

1. Foot and Mouth disease
2. Anthrax
3. Black Quarter
4. Cowpox

Select the correct answer using the codes given below:

Consider the following statements:

1. Dengue is a protozoan disease transmitted by mosquitoes.
2. Retro-orbital pain is not a symptom of Dengue.
3. Skin rash and bleeding from nose and gums are some of the symptoms of Dengue.

Which one of the following statements is/are correct?

Consider the following statements:

1. Non-function of lachrymal gland is an important symptom of deficiency of Vitamin A.
2. Deficiency of Vitamin B1 can lead to indigestion and heart enlargement.
3. Vitamin C deficiency can lead to pain in the muscles.
4. Deficiency of Vitamin D causes increased loss of Ca++ in urine.

Which of these statements given above are correct?

The hormone insulin is a

In which organ of the human body are the lymphocyte cells formed?

Consider the following statements:

1. Adam Osborne produced the first portable computer.
2. Ian Wilmut created the first cloned sheep.

Which of these statements given above is/are correct?

Param Padam, which was in news recently, is

Consider the following statements:

1. Banking soda is used in fire extinguishers.
2. Quicklime is used in the manufacture of glass.
3. Gypsum is used in the manufacture of Plaster of Paris.

Which of the statements given above is/are correct?

Assertion (A): In our houses, the current in AC electricity line changes direction 60 times per second.

Reason (R): The frequency of alternating voltage supplied is 60 hertz.

Assertion (A): Fatty acids should be a part of the balanced human diet.

Reason (R): The cells of the human body cannot synthesize any fatty acids.

Match List I (Institute) with List II (Located At) and select the correct answer using the codes given below:

1. Coimbatore
2. Mumbai
3. Jabalpur
4. Hyderabad

List I (A) Indian Institute of Geomagnetism (B) International Advanced Research Centre for Powder Metallurgy and New Materials (C) Salim Ali Centre for Ornithology and Natural History (D) Tropical Forestry Research Institutes

List II

Codes: ABCD

Consider the following statements:

1. Indira Gandhi Centre for Atomic Research uses fast reactor technology.
2. Atomic Minerals Directorate for Research and Exploration is engaged in heavy water production.
3. Indian Rare Earths Limited is engaged in the manufacture of Zircon for India's nuclear programme beside other rare earth products.

Which of these statements given above are correct?

Which of the following pairs is NOT correctly matched?

A car is running on a road at a uniform speed of 60 km/hr. The net resultant force on the car is

The research work of Paul Lauterbur and Peter Mansfield, the Nobel Prize winners for Medicine in 2003, relates to

Match List I (Fuel Gases) with List II (Major Constituents) and select the correct answer using the codes given below:

1. Carbon monoxide, Hydrogen
2. Butane, Propane
3. Methane, Ethane
4. Hydrogen, Methane, Carbon monoxide

List I (A) CNG (B) Coal gas (C) LPG (D) Water gas

List II

Codes:

A spherical body moves with a uniform angular velocity ω around a circular path of radius r.

Which one of the following statements is correct?

Standard 18-carat gold sold in the market contains

A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to

Salts

of which of the following elements provide colours to fireworks?

Consider the following statements:

1. Femur is the longest bone in the human body.
2. Cholera is a disease caused by bacteria.
3. ‘Athlete’s foot’ is a disease caused by virus.

Which of the statements given above are correct?

Consider the following statements:

1. Smart Card is a plastic card with an embedded microchip.
2. Digital Technology is primarily used with new physical communication medium such as satellite and fibre optics transmission.
3. A digital library is a collection of documents in an organized electronic form available on the Internet only.

Which of these statements given above is/are correct?

A person stands at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room, while plane. The path traced by a person standing at the middle point of the slipping ladder is

With reference to the work of human kidney, consider the following statements:

1. After the waste is removed in the kidney, the cleaner blood is sent back through renal artery.
2. From Bowman’s capsule, the filtered liquid passes through tiny tubes where much of the glucose is reabsorbed and sent back to the blood in the renal vein.

Which of these statements is/are correct?

A hydrogen-inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will

Consider the following statements:

1. India launched its first full-fledged meteorological satellite (METSAT) in September 2002.
2. For the first time, the space vehicle PSLV-C4 carried a payload of more than 1000 kg into a geosynchronous orbit.

Which of these statements is/are correct?

Consider the following statements:

1. Steam at 100 °C and boiling water at 100 °C contain the same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils.

Which of these statements is/are correct?

Consider the following statements: A four-wheel vehicle moving on a sharp circular path at high speed will

1. Overturn about its outer wheels.
2. Overturn about its inner wheels.
3. Skid outwards.
4. Skid inwards.

Which of these statements are correct?

Which one of the following statements is correct?

Diffusion of light in the atmosphere takes place due to