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IT, Communication Networks and Space Technology

What is the difference between a CFL and an LED lamp? (2011)

1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.

2. The average life span of a CFL is much longer than that of an LED lamp.

3. A CFL is less energy-efficient as compared to an LED lamp.

Which of the statements given above is/are correct?
(a.) 1 only
(b.) 2 and 3 only
(c.) 1 and 3 only
(d.) 1, 2 and 3

Solution: C

 

A new optical disc format known as the Blu-ray Disc (BD) is becoming popular. In what way is it different from the traditional DVD? (2011)

1. DVD supports Standard Definition video while BD supports High Definition video.
2. Compared to a DVD, the BD format has several times more storage capacity.
3. Thickness of BD is 2.4 mm white that of DVD is 1.2 mm.

Which of the statements given above is/are correct?

(a.) 1 only
(b.) 1 and 2 only
(c.) 2 and 3 only
(d.) 1, 2 and 3

Solution: B

 

Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when: (2011)

1. The orbit is geosynchronous.
2. The orbit is circular,
3. The orbit lies in the plane of the Earth’s equator.
4. The orbit is at an altitude of 22,236 km.

Select the correct answer using the codes given below:

(a.) 1, 2 and 3 only
(b.) 1, 3 and 4 only
(c.) 2 and 4 only
(d.) 1, 2,3 and 4

Solution: A

 

What is the difference between Bluetooth and Wi-Fi devices? (2011)


(a.) Bluetooth uses 2.4 GHz radio frequency band, whereas-Wi-Fi can use 2.4 GHz or 5 GHz frequency band.
(b.) Bluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only.
(c.) When information is transmitted between two devices using Blue-tooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other
(d.) The statements (a) and (b) given above are correct in this context

Solution: C

 

What is “Virtual Private Network”? (2011)

(a.) It is a private computer network of an organization where the remote users can transmit encrypted information through the server of the organization
(b.) It is a computer network across a public internet that provides users access to their organization’s network while maintaining the security of the information transmitted
(c.) It is a computer network in which users can access a shared pool of computing resources through a service provider.
(d.) None of the statements (a), (b) and (c) given above is a correct description of Virtual Private Network

Solution: B

 

Which of the following pair is/are correctly matched? (2014)

Spacecraft Purpose
1. Cassini-Huygens Orbiting the Venus and transmitting data to the Earth
2. Messenger Mapping and investigating the Mercury
3. Voyager 1 and 2 Exploring the outer solar system

Select the correct answer using the code given below.

  1. 1 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3

Solution: B

 

Which reference to Agni-IV Missile, which of the following statements is/are correct? (2014)

  1. It is a surface-to-surface missile.
  2. It is fuelled by liquid propellant only.
  3. It can deliver one-tonne nuclear warheads about 7500 km away.

Select the correct answer using the code given below.

  1. 1 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3

Solution: A

 

BIO-TECHNOLOGY

 

A genetically engineered form of brinjal, known as the Bt-brinjal, has been developed. The objective of this is (2011)

(a.) To make it pest-resistant
(b.) To improve its taste and nutritive qualities
(c.) To make it drought-resistant
(d.) To make its shelf-life longer

Solution: A

Other than resistance to pests, what are the prospects for which genetically engineered plants have been created? (2012)

1. To enable them to withstand drought
2. To increase the nutritive value of the produce
3. To enable them to grow and do photosynthesis in spaceships and space stations
4. To increase their shelf life.

Select the correct answer using the codes given below:

(a) 1 and 2 only
(b) 3 and 4 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4

Solution: C

 

Recombinant DNA technology (Genetic Engineering) allows genes to be transferred (2013)

1. Across different species of plants.
2. From animals to plants.
3. From microorganisms to higher organisms.

Select the correct Solution using the codes given below.

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution: A

 

Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to (2013)

1. Resist drought and increase absorptive area
2. Tolerate extremes of PH
3. Resist disease infestation

Select the correct Solution using the codes given below:

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution: D

In addition to fingerprint scanning, which of the following can be used in the biometric identification of a person? (2014)

  1. Iris scanning
  2. Retinal scanning
  3. Voice recognition

Select the correct answer using the code given below.

  1. 1 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3

Solution: D

 

PHYSICS

Graphene is frequently in news recently. What is its importance? (2012)

1, It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 3 and 4 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4

SOLUTION: (c)

 

Consider the following: (2013)

1. Electromagnetic radiation
2. Geothermal energy
3.Gravitational force
4.Plate movements
5.Rotation of the earth
6. Revolution of the earth

Which of the above are responsible for bringing dynamic changes on the surface of the earth?

(a) 1, 2, 3 and 4 only
(b) 1, 3, 5 and 6 only
(c) 2, 4, 5 and 6 only
(d) 1, 2, 3, 4, 5 and 6

Solution: D

During a thunderstorm, the thunder in the skies is produced by the (2013)

1. Meeting of cumulonimbus clouds in the sky
2. Lightning that separates the nimbus clouds
3. Violent upward movement of air and water particles

Select the correct answer using the codes given below.

(a) 1 only
(b) 2 and 3
(C) 1 and 3
(d) None of the above produces the thunder

Solution: C

Consider the following phenomena: (2013)

1. Size of the sun at dusk
2. Colour of the sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky

Which of the above are optical illusions?

(a) 1, 2 and 3
(b) 3, 4 and 5
(c) 1, 2 and 4
(d) 2, 3 and 5

Solution: C

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? 20-13
1. Dispersion
2. Refraction
3. Internal reflection

Select the correct Solution using the codes given below.
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution: A

 

Physics: Current Affairs

A team of scientists at Brookhaven National Laboratory including those from India created the heaviest anti-matter (anti-helium nucleus). What is/are the implication/ implications of the creation of anti-matter? (2012)

1. It will make mineral prospecting and oil exploration easier and cheaper.
2. It will help probe the possibility of the existence of stars and galaxies made of anti-matter.
3. It will help understand the evolution of the universe.

Select the correct answer using the codes given below:

(a) 1 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3

Solution: B

The efforts to detect the existence of Higgs boson particle have become frequent news in the recent past. What is /are the importance/importance of discovering this particle? (2013)

1. It will enable us to understand as to why elementary particles have mass.
2. It will enable us in the near future to develop the technology to transferring matter from one point to another without traversing the physical space between them.
3. It will enable us to create better fuels for nuclear fission.

Select the correct answer using the codes given below:

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution: A

 

Which of the following is /are cited by the scientists as evidence/ evidences for the continued expansion of universe? (2012)

1. Detection of microwaves in space
2. Observation of redshift phenomenon in space
3.Movement of asteroids in space
4. Occurrence of supernova explosions in space

Select the correct answer using the codes given below:

(a) 1 and 2
(b) 2 only
(c) 1, 3 and 4
(d) None of the above can be cited as evidence

Solution: B

 

Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth? (2012)

(a) The Earth’s magnetic field diverts them towards its poles
(b) Ozone layer around the Earth reflects them back to outer space
(c) Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth
(d) None of the statements (a), (b) and (c) given above is correct

Solution: A

Ball bearings are used in bicycles, cars, etc., because (2013) 

(a) the actual between the is increased area of contact wheel and axle
(b) the effective between the is increased area of contact wheel and axle
(c) the effective between the is reduced area of contact wheel and axle
(d) None of the above statements is correct

Solution: C

The known forces of nature can be divided into four classes, viz, gravity electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct? (2013)

(a) Gravity is the strongest of the four
(b) Electromagnetism act only on particles with an electric charge
(c) Weak nuclear force causes radioactivity
(d) Strong nuclear force holds protons and neutrons inside the nuclear of an atom.

Solution: A

 

BIOLOGY

A married couple adopted a male child, A few years later; twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is (2011)

(a.) O positive

(b.) A positive

(c.) B positive

(d.) Cannot be determined on the basis of the given data

A

 

At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us? (2011)

1. It is possible to know the pedigree of livestock.
2. It is possible to understand the causes of all human diseases.
3. It is possible to develop disease-resistant animal breeds.

Which of the statements given above is/are correct?

(a.) 1 and 2 only
(b.) 2 only
(c.) 1 and 3 only
(d.) 1, 2 and 3

Solution: D

 

With reference to ‘stem cells’, frequently in the news, which of the following statements is/are correct? (2012)

1. Stem cells can be derived from mammals only.
2. Stem cells can be used for screening new drugs.
3. Stem cells can be used for medical therapies.

Select the correct answer using the codes given below:

(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3

SOLUTION: B

Which of the following diseases can be transmitted from one person to another through tattooing? (2013)

1. Chikungunya
2. Hepatitis B
3. HIV-AIDS

Select the correct answer using the codes given below.

(a) 1 only
(b) 2 and 3 only
(e) 1 and 3 only
(d) 1, 2 and 3
Solution: B

Consider the following minerals (2013)

1. Calcium
2. Iron
3. Sodium

Which of the minerals given above is/are required by human body for the contraction of muscles?

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution: C

 

Which of the following statements is / are correct? (2013)

1. Viruses lack enzymes necessary for the generation of energy.
2. Viruses can be cultured in any synthetic medium.
3. Viruses are transmitted from one organism to another by biological vectors only.

Select the correct answer using the codes given below.

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution: C

 

Consider the following diseases (2014)

  1. Diphtheria
  2. Chickenpox
  3. Smallpox

Which of the above diseases has/have been eradicated in India?

  1. 1 and 2 only
  2. 3 only
  3. 1, 2 and 3
  4. None

Solution (b)

Consider the following pairs : (2014)

Vitamin Deficiency disease
1. Vitamin C Scurvy
2. Vitamin D Rickets
3. Vitamin E Night blindness

Which of the pairs given above is/are correctly matched?

  1. 1 and 2 only
  2. 3 only
  3. 1, 2 and 3
  4. None

Solution (a)

 

CHEMISTRY

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason? (2011)

(a.) Ice is a bad conductor of heat
(b.) Since the surface of the lake is at the same temperature as the air, no heat is lost
(c.) The density of water is maximum at 4°C
(d.) None of the statements (a), (b) and (c) given above is correct

Solution: C

The function of heavy water in a nuclear reactor is to (2011)

(a.) Slow down the speed of neutrons
(b.) Increase the speed of neutrons
(c.) Cool down the reactor
(d.) Stop the nuclear reaction

Solution: A

 

To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, what advantage does thorium hold over uranium? (2012)

1. Thorium is far more abundant in nature than uranium.
2. On the basis of per unit mass of mined mineral, thorium can generate more energy compared to natural uranium.
3. Thorium produces less harmful waste compared to uranium.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution: D

 

Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning? (2012)

1. Smelting units
2. Pens and pencils
3.Paints
4. Hair oils and cosmetics

Select the correct answer using the codes given below:

(a) 1, 2 and 3 only
(b) 1 and 3 only
(c) 2 and 4 only
(d) 1, 2, 3 and 4

Solution: B

BIO_CHEMISTRY: (only basics)

 

Fruits stored in a cold chamber exhibit longer storage life because (2013)

(a) exposure to sunlight is prevented
(b) concentration dioxide in the is increased of carbon environment
(c) rate of respiration is decreased
(d) there is an increase in humidity

Solution: C

Many transplanted seedlings do not grow because (2013)

(a) the new soil does not contain favorable minerals
(b) most of the root hairs grip the new soil too hard
(c) most of the root hairs are lost during trSolutionplantation
(d) leaves get damaged during trSolutionplantation

Solution: C

 

Which of the following is/are the example/examples of chemical change? (2014)

  1. Crystallization of sodium chloride
  2. Melting of ice
  3. Souring of milk

Select the correct answer using the code given below.

  1. 1 and 2 only
  2. 3 only
  3. 1, 2 and 3
  4. None

Solution: b

 

 

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