Science & Technology – UPSC Prelims PYQs

A fuse is used in main electric supply as a safety device.

Which one of the following statements about the fuse is correct?

Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains

Match List I with List II

and select the correct answer using the codes given below the lists:

List I (Disease) I. Malaria II. Poliomyelitis III. Tuberculosis IV. Ringworm

List II (Organism) A. Fungi B. Bacteria C. Virus D. Protozoan

Codes:

Haemophilia is a genetic disorder which leads to

Consider the following statements about acetylene: I. It is used in welding industry. II. It is raw material for preparing plastics. III. It is easily obtained by mixing silicon carbide and water. Of these statements:

A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s². What will be its velocity after 3 seconds?

Match List I with List II

and select the correct answer by using the codes given below the lists:

List I (Special Characteristic) I. Farthest planet from the Sun II. Largest planet of the solar system III. Planet second from the Sun in the solar system IV. Planet nearest to the Sun

List II (Name of Planet) A) Mercury

B) Venus

C) Jupiter

D) Pluto

E) Saturn

Which one of the following types of micro-organisms is most widely used in industries?

Match the names of outstanding Indian scientists given in List I with the area of their specialised work given in List II and select the correct answer using the codes given below the lists:

List I I. Dr. Raja Ramanna II. Dr. M. S. Swaminathan III. Prof. U. R. Rao IV. Prof. Meghnad Saha

List II A) Plant Chemistry B) Nuclear Physics E) Agricultural sciences

C) Thermodynamics and astrophysics

Match List I with List II

and select the correct answer using the codes given below the lists:

List I I. Fruit II. Seed III. Wood IV. Starch

List II A) Ovule

B) Leaf

C) Stem

D) Ovary

Match List I with List II

and select the correct answer using the codes given below the lists:

List I I. Theory of Mutation II. Theory of Evolution III. One-gene-one-enzyme hypothesis IV. Operon concept

List II A) Beadle and Tatum

B) Jacob and Monod

C) Darwin

D) De Vries

Which one of the following statements regarding starch and cellulose is NOT correct?

Ergotism is due to consumption of

The complete conversion of glucose in the presence of oxygen into carbon dioxide and water with release of energy is called

The major chemical compound found in human kidney stones is

One Astronomical Unit is the average distance between

Match List I with List II

and select the correct answer using the codes given below the lists:

List I I. Blue vitriol II. Epsom salt III. Baking soda IV. Caustic soda

List II A) Sodium bicarbonate

B) Sodium hydroxide

C) Magnesium sulphate

Assertion (A): Formic acid is a stronger acid than acetic acid.

Reason (R): Formic acid is an organic acid.

Assertion (A): The temperature of a metal wire rises when an electric current is passed through it.

Reason (R): Collision of metal atoms with each other releases heat energy.

Assertion (A): Phenyl is used as a household germicide.

Reason (R): Phenyl is a phenol derivative and phenol is an effective germicide.

Assertion (A): Sodium metal is stored under kerosene.

Reason (R): Metallic sodium melts when exposed to air.

The tail of a comet is directed away from the sun because

Which one of the following was used as a chemical weapon in the First World War?

The world’s fastest computer has been able to perform (as of Dec. 1996)

A major health mission carried in 1996 was

Which one of the following techniques can be used to establish the paternity of a child?

Which one of the following stars is nearest to the earth?

Which one of the following conditions is most relevant for the presence of life on Mars?

Which one of the following is present in the largest amount in terms of per cent by mass in the earth’s crust?

The tendency of a liquid drop to contract and occupy minimum area is due to

Which one of the following is a vector quantity?

The planet Mercury is revolving in an elliptical orbit around the sun as shown in the given figure. The kinetic energy of Mercury is greatest at the point labelled

Which one of the following is a valid conclusion?

The working principle of a washing machine is

The characteristic odour of garlic is due to

Which one of the following is an active component of oil of clove?

The most reactive among the halogens is

Which one of the following is paramagnetic in nature?

Which one of the following has the highest fuel value?

Which one of the following is used as an anti-freeze for the automobile engines?

The pituitary gland by virtue of its tropic hormones controls the secretory activity of other endocrine glands.

Which one of the following endocrine glands can function independent of the pituitary gland?

Oxygen transportation in a human body takes place through I. Blood II. Lungs III. Tissue The correct sequence of transportation is

Corpus luteum is a mass of cells found in

Alpha-keratin is a protein present in

What is the average fat content of buffalo milk?

The major component of honey is

Arteries supplying blood to the heart are called

Recommended daily intake of proteins for a moderately active woman is

The sequencing of the entire genome (the totality of all genes) of an organism was completed in 1996. The organism was

Match List I with List II

and select the correct answer by using the codes given below the lists:

List I I. Malaria II. Filaria III. Encephalitis IV. Leukaemia

List II A) Bone marrow B) Brain C) Muscle D) Lymph node E) Blood cells