Science and Technology
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
India-based neutrino observatory is included by the planning commission as a mega science project under the 11th five-Year Plan. In this context, consider the following statements: (2010)
1. Neutrinos are chargeless elementary particles that travel close to the speed of light. 2. Neutrinos are created in nuclear reactions of beta decay.
3. Neutrinos have a negligible, but nonzero mass.
4. Trillions of Neutrinos pass through human body every second.
Which of the statements given above are correct ?
(a) 1 and 3 only (b) 1, 2 and 3 only (c) 2, 3 and 4
(d) 1, 2, 3 and 4
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
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
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
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
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
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.
(a) 1 and 2 only (b) 3 only
(c) 1, 2 and 3 (d) None
(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
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 transplantation (d) leaves get damaged during transplantation
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
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
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
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
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
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
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
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