Science and Technology (Part-II)

Total Questions: 50

31. In which of the following are hydrogels used? [2024-1]

1. Controlled drug delivery in patients

2. Mobile air-conditioning systems

3. Preparation of industrial lubricants

Select the correct answer using the code given below:

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

Correct Answer: (d) 1,2 and 3

Solution:Hydrogels, water-absorbent crosslinked polymer networks, are valuable in biotechnology and soft robotics due to their biocompatibility, flexibility, and responsiveness to environmental changes. They are extensively used in medical applications like wound dressings, drug delivery systems, and tissue engineering. In drug delivery, hydrogels encapsulate and release drugs in a controlled manner, leveraging their hydrophilic nature.

Additionally, they enhance mobile air-conditioning by managing humidity and improve industrial lubricants by reducing friction, controlling viscosity, and enhancing thermal stability.

32. Assertion (A): Information technology is fast becoming a very important field of activity in India. [1999]

Reason (R): Software is one of the major exports of the country and India has a very strong base in hardware.

(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Correct Answer: (c) A is true but R is false

Solution:Yes, it is true that information technology is fast becoming a very important field of activity in India because now a days it is used everywhere in development of every sector. It is applied in field of medicine, research, banking etc. It is also true that software is one of major exports of the country but India does not have strong base in hardware.

33. The memory of a computer is commonly expressed in terms of kilobytes or megabytes. A byte is made up of: [2000]

(a) eight binary digits
(b) eight decimal digits
(c) two binary digits
(d) two decimal digits

Correct Answer: (a) eight binary digits

Solution:The byte, is a unit of digital information in computing and telecommunications, that most commonly consists of eight bits.

34. Consider the following statements: [2004]

1. Smart card is a plastic card with an embedded microchip.

2. Digital technology is primarily used with new physical communication medium such as satellite and fiber optics transmission.

3. A digital library is a collection of documents in an organized electronic form available on the internet only.

Which of the statements given above is/are correct?

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

Correct Answer: (b) 1 and 2

Solution:A digital library is an online database of digital objects-text, images, audio, and videos etc. Besides it, it provides means for organizing, searching and retrieving the content contained in the collection.

35. Consider the following statements: [2004]

1. Adam Osborne introduced the first portable computer.

2. Ian Wilmut created the first cloned sheep.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Correct Answer: (c) Both 1 and 2

Solution:Adam Osborne introduced the first portable computer in 1981 and Ian Wilmut, an English embryologist first cloned a mammal (Lamb) in year 1996.

36. WiMAX is related to which one of the following : [2009]

(a) Biotechnology
(b) Space technology
(c) Missile technology
(d) Communication technology

Correct Answer: (d) Communication technology

Solution:WiMAX is one of the hottest broadband wireless technologies around today. WiMAX systems are expected to deliver broadband access services to residential and enterprise customers in an economical way.

37. Consider the following: [2010]

1. Bluetooth device

2. Cordless phone

3. Microwave oven

4. Wi-Fi device

Which of the above can operate between 2.4 and 2.5 GHz range of radio frequency band?

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

Correct Answer: (d) 1, 2, 3 and 4

Solution:Microwaves are electromagnetic wages with wavelengths ranging from as long as one meter to as short as one millimeter, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz. A microwave oven passes (nonionizing microwage radiation (at a frequency near 2.45 GHz) through food, causing dielectric heating by absorption of energy in the water, fats and sugar contained in the food. Bluetooth and Wi-Fi have many applications: setting up networks, printing, or transferring files. They also work in the given frequency range. All cordless sold in the US use the 1.9 GHz or 2.4-GHz bands.

38. Recently, LASIK (Laser Assisted In Situ Keratomileusis) procedure is being made popular for vision correction. Which one of the following statements in this context is-not correct? [2010]

(a) LASIK procedure is used to correct refractive errors of the eye
(b) It is a procedure that permanently changes the shapes of the cornea
(c) It reduces a person's dependence on glasses or contact lenses
(d) It is a procedure that can be done on the person of any - age

Correct Answer: (d) It is a procedure that can be done on the person of any - age

Solution:In order to under go LASIK procedure one should be at least 18 years old, as the vision of people younger than 18 usually continues to change.

39. Which among the following do/does not belong/belongs to the GSM family of wireless technologies? [2010]

(a) EDGE
(b) LTE
(c) DSL
(d) Both EDGE and LTE

Correct Answer: (c) DSL

Solution:More than 3.8 billion people worldwide used the Global System for Mobile Communications (GSM) family of technologies as of May 2009. GSM is the most widely used wireless technology in the world. GSM has straightforward, cost-effective migration path to 3G through GPRS, EDGE and UMTS-HSPA, as well as beyond 3G via the HSPA Evolution (HSPA+). LTE and System Architecture Evolution (SAE) initiatives.

40. What is the difference between Blue-tooth and Wi-Fi devices? [2011-1]

(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 Bluetooth 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.

Correct Answer: (a) Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band.

Solution:Bluetooth networking transmits data via low-power radio waves. It communicates on a frequency of 2.45 gigahertz (actually between 2.402 GHz and 2.480 GHz, to be exact).

Wi-Fi-IEEE 802.11 is a set of standards for implementing wireless local area network (WLAN) computer communication in the 2.4, 3.6 and 5 GHz frequency bands.

« Previous 1 2 345 Next »