Science & Technology – UPSC Prelims PYQs

Antigen is a substance which

A smooth inclined plane is inclined at an angle θ with the horizontal as shown in the figure. A body starts from rest and slides down the inclined surface. The time taken by the body to reach the bottom is

A girl is swinging on a swing in sitting position. When the same girl stands up, the period of swing will

According to the World Health Organisation, the disease which causes the death of the largest number of people today is

Which one of the following satellites is to be launched from India in 1996?

Which one of the following is a modern tank?

Which one of the following is a modified stem?

Fat present below the skin surface in our body acts as a barrier against

Which of the following professional(s) are more likely to run the risk of a permanent change in their cell’s DNA? I. Researchers using carbon-14 isotope II. X-ray technician III. Coal miner IV. Dyer and painter

Select the correct answer using the codes given below:

Which one of the following is NOT an essential micronutrient for plants?

Of the four landmarks in medical history given below, which one was the first to take place?

The nutritional deficiency condition that needs to be given top priority for remedial action in India today is

Living organisms require at least 27 elements, of which 15 are metals. Among these, those required in major quantities include

Match List I with List II

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

List I I. Vitamin II. Enzyme III. Hormone IV. Protein

List II A. Pepsin B. Carotene C. Keratin D. Progesterone

It is possible to produce seedless tomato fruits by

Which of the following are associated with diabetes mellitus, a common disease in adults? I. Higher sugar level in blood II. Lower sugar level in blood III. Lower insulin level in blood IV. Higher insulin level in blood

Select the correct answer using the codes given below:

Consider the following statements: AIDS is transmitted — I. By sexual intercourse. II. By blood transfusion. III. By mosquitoes and other blood-sucking insects. IV. Across the placenta. Of these statements —

Which of the following would lead to ‘malnutrition’? I. Overnutrition II. Undernutrition III. Imbalanced nutrition

Select the correct answer using the codes given below:

People drinking water from a shallow hand pump are likely to suffer from all of the following diseases, except

Besides proteins and carbohydrates, other elements of nutritional value found in milk include

I. ‘A’ stood first in the race. II. ‘C’ led all the way.

III. ‘D’ ran faster than others in the later part of the race. Of these statements

When an air bubble at the bottom of a lake rises to the top, it will

When a mirror is rotated by an angle of θ, the reflected ray will rotate by

A truck, a car and a motor cycle have equal kinetic energies. If equal stopping ...

A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be

The variation of displacement (d) with time (t) in the case of a particle falling freely under gravity from rest is correctly represented by which of the following graphs?

Total internal reflection can take place when light travels from

Assertion (A): Transformer is useful for stepping up or stepping down voltages.

Reason (R): Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct?

Domestic electrical wiring is basically a

Consider the following statements: At the present level of technology available in India, solar energy can be conveniently used to I. Supply hot water to residential buildings. II. Supply water for minor irrigation projects. III. Provide street lighting. IV. Electrify a cluster of villages and small towns. Of these statements

A simple machine helps a person doing

Consider the following statements: A person in a spaceship located half-way between the earth and the sun will notice that the I. Sky is jet black. II. Stars do not twinkle. III. Temperature outside the spaceship is much higher than that on the surface of the earth. Of these statements

‘Diamond Ring’ is a phenomenon observed

The alpha particle carries two positive charges. Its mass is very nearly equal to that of

The offending substance in the liquor tragedies leading to blindness, etc. is

Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?

Match List I (Physiological processes) with List II (Cell organelles) and select the correct answer by using the codes given below the lists:

List I I. Photosynthesis II. Mineral uptake III. Respiration IV. Protein Synthesis

List II A) Plasma membrane B) Chloroplast C) Mitochondria D) Ribosomes

Codes:

A meteor is

The Nobel Prize for deciphering the language of bees was awarded to

In the field of space technology, India has demonstrated during 1994 her capability to

Comet Shoemaker-Levy 9 hit the planet

Which one of the following is a mixed fertilizer?

Which one of the following polymers is widely used for making bullet-proof material?

The chemical used as a ‘fixer’ in photography is

The technique used to transmit audio signals in television broadcasts is

A parachutist jumps from a height of 5000 metres. The relationship between his falling speed ‘v’ and the distance fallen through ‘d’ is best represented as (four graphs labelled a, b, c, d).

Which one of the following can be used to confirm whether drinking water contains a gamma-emitting isotope or not?

The normal temperature of human body on the Kelvin scale is

When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.

Reason (R): The refractive index of diamond is less than that of glass. In the context of the above two statements, which one of the following is correct?