MCQ on Technology

Q1 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

 

Q2  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

 

Q3 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

 

Q4 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

 

Q5 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

 

Q6 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

 

Q 7 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

 

Q 8 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

Q 9 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

 

Q 10 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

 

Q 11 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

Q 12 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

Q 13 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)

 

Q 14  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

Q 15 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

Q 16 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

 Q 17 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