UPSC 2000 › Science & Technology

Which one of the following does a TV remote control unit use to operate a TV set?

A noise level of 100 decibels would correspond to

A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its

The memory of a computer is commonly expressed in terms of Kilobytes or Megabytes. A byte is made up of

Consider the following features of newer models of motor cars: I. Radial tyres II. Streamlined body III. Multipoint fuel injection IV. Catalytic converter with exhaust

Which of these features make the newer models of motor cars more fuel-efficient?

Fluorescent tubes are fitted with a choke. The choke coils

For reproducing sound, a CD (Compact Disc) audio player uses a

When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow-like colours are seen. This can be explained on the basis of the phenomenon of

Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.

Reason (R): If no external force acts on a system, its momentum cannot change.

Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film.

Reason (R): An image formed on the retina of eye persists for about 0.1 s after the removal of stimulus.

Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them.

Reason (R): Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected back into a rarer medium.

The stones formed in human kidney consist mostly of

Most of the explosions in mines occur due to the mixing of

Match List I with List II

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

List I I. German Silver II. Solder III. Bleaching Powder IV. Hypo

List II A) Tin B) Nickel C) Sodium D) Chlorine

Codes:

Which one of the following materials is very hard and very ductile?

Soft drinks such as colas contain significant quantities of

Aluminium surfaces are often “anodized”. This means the deposition of a layer of

A small pouch containing silica gel is often found in bottles of medicine in tablet or powder form because silica gel

Match List I (Industrial processes) with List II (Industry with which associated) and select the correct answer using the codes given below the Lists:

List I I. Cracking II. Smelting III. Hydrogenation IV. Vulcanization

List II A) Rubber B) Petroleum C) Copper D) Edible fats

Codes:

Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.

Reason (R): Ammonia can be liquified at ambient temperatures at low pressures.

Which one of the following organisms can serve as a biofertilizer for rice crop?

At which stage in its life-cycle does the silkworm yield the fibre of commerce?

Match List I (Diseases) with List II (Types of disease) and select the correct answer using the codes given below the Lists:

List I I. Haemophilia II. Diabetes III. Diabetes IV. Ringworm

List II A) Deficiency disease B) Genetic disease C) Hormonal disorder D) Fungal infection

Codes:

The blood glucose level is commonly expressed as

Phytotron is a facility to

Match List I (Endocrine glands) with List II (Hormones secreted) and select the correct answer using the codes given below the Lists:

List I I. Gonads II. Pituitary III. Pancreas IV. Adrenal

List II A) Insulin B) Progesterone C) Growth hormones D) Cortisone

Codes:

Insect resistant cotton plants have been genetically engineered by inserting a gene from a/an

Hybridoma technology is a new biotechnological approach for commercial production of

The sensation of fatigue in the muscles after prolonged strenuous physical work is caused by

Consider the following statements: Hard water is not suitable for I. Drinking. II. Washing clothes with soap. III. Use in boilers. IV. Irrigating crops.

Which of these statements are correct?

Canola refers to special type of oil seed mustard varieties bred for human consumption. The main characteristic of these varieties is that the

Assertion (A): In human beings, the females play a major role in determining the sex of the offspring.

Reason (R): Women have two ‘X’ chromosomes.

Assertion (A): “DNA Finger-printing” has become a powerful tool to establish paternity and identity of criminals in rape and assault cases.

Reason (R): Trace evidences such as hairs, saliva and dried semen are adequate for DNA analysis.