Miscellaneous Physics Part-2

Total Questions: 51

41. The principle of the atom bomb is based on- [U.P. U.D.A/L.D.A. (Pre) 2007]

(a) Nuclear fission
(b) Nuclear fusion
(c) Nuclear spallation
(d) None of these

Correct Answer: (a) Nuclear fission

Solution:The principle of the atom bomb is based on nuclear fission. In 1939, the German scientists Otto Hahn and F. Strassmann determined that if slow-moving neutrons are bombarded on Uranium-235, the nucleus of Uranium-235 breaks into two equal parts and releases lots of energy. This process is called nuclear fission.

42. What was the fissionable material used in the bombs dropped at Nagasaki (Japan) in the year 1945? [56th to 59th B.P.S.C. (Pre) 2015]

(a) Sodium
(b) Potassium
(c) Plutonium
(d) Uranium

Correct Answer: (c) Plutonium

Solution:'Fat Man' was the code name for the type of bomb dropped on the Japanese city of Nagasaki on August 9, 1945, by the United States of America. Plutonium was used as fissionable material in this bomb. On the other hand, 'Little Boy,' which was dropped on the Japanese city of Hiroshima on August 6, 1945, used Uranium as fissionable material.

43. Which country has test-launched the first 3D television broadcast? [M.P.P.C.S. (Pre) 2013]

(a) U.K.
(b) America
(c) China
(d) South Africa

Correct Answer: (c) China

Solution:China test-launched its first 3D television broadcast. This occurred in January 2012 with the launch of the "China 3D TV Trial Channel." The channel was jointly operated by China Central Television (CCTV) and five local TV stations.

44. Consider the following statements: [U.P.P.C.S. (Mains) 2009]

The most important technological application of liquid crystals is in digital display.
A modem is a device that is connected to a computer and to a phone line.
The National Institute of Oceanography is located at Coimbatore.
Virginis-70 is a system for recording video programmes.

Of these statements:

(a) Only 1 and 2 are correct
(b) Only 2 and 3 are correct
(c) Only 2, 3, and 4 are correct
(d) Only 3 and 4 are correct

Correct Answer: (a) Only 1 and 2 are correct

Solution:A Liquid Crystal Display (LCD) is a flat panel display used to display text, images, and video by electronic methods.

A modem modulates outgoing digital signals to analog signals for a conventional copper twisted-pair telephone line and demodulates the incoming analog signal, converting it back to digital. It is connected to a computer and a phone line.

The National Institute of Oceanography is located in Goa, with regional centers in Kochi, Mumbai, and Visakhapatnam.

Virginis-70 is a yellow dwarf star approximately 59 light-years away in the constellation Virgo.

45. Liquid crystals are used in: [U.P.P.C.S. (Pre) 1996]

(a) Wrist Watches
(b) Display Devices
(c) Pocket Calculators
(d) All of the above

Correct Answer: (d) All of the above

Solution:

Liquid crystals are used in wristwatches, display devices, pocket calculators, and many portable computers.

46. Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What are the advantages of OLED displays over Liquid Crystal displays? [I.A.S. (Pre) 2017]

1. OLED displays can be fabricated on flexible plastic substrates

2. Roll-up displays embedded in clothing can be made using OLEDs.

3. Transparent displays are possible using OLEDs.

Select the correct answer using the code given below:

(a) 1 and 3 only
(b) 2 only
(c) 1, 2, and 3
(d) None of the above statements is correct

Correct Answer: (c) 1, 2, and 3

Solution:An organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. OLED displays can be fabricated on flexible plastic substrates. Roll-up displays embedded in clothing can be made using OLEDs. Transparent displays are also possible using OLEDs.

47. With a 16:9 picture aspect ratio, display resolution 1080p means: [R.A.S/R.T.S. (Pre) 2021]

(a) 1080 x 1080 pixels
(b) 1920 x 1080 pixels
(c) 720 x 1080 pixels
(d) 3840 x 1080 pixels

Correct Answer: (b) 1920 x 1080 pixels

Solution:With 16:9 picture aspect ratio, display resolution 1080p means 1920 x 1080 pixels. It is usually known as FHD or 'Full HD' resolution. 1080p is a set of HDTV high-definition video modes characterized by 1920 pixels displayed across the screen horizontally and 1080pixels down the screen vertically.

48. Which one of the following devices is used to cool the engine of the vehicles? [U.P.P.C.S. (Mains) 2014]

(a) Polygraph
(b) Turbine
(c) Radiator
(d) Quadrant

Correct Answer: (c) Radiator

Solution:Radiators are heat exchange used for cooling internal combustion engines, mainly in automobiles but also in piston-engine aircraft, railway locomotives, motorcycles, stationary generating plants, or any similar use of such an engine.

49. Mobiles and automobiles have brought about a revolution in the social life of Indians, especially in rural area, in term of: [U.P. U.D.A/L.D.A. (Spl) (Pre) 2010]

Mobility of the people
Connectivity of the people
Sensitivity of the people

Select the correct answer from the code given below:

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

Correct Answer: (a) 1 and 2 only

Solution:Mobiles and Automobiles have brought about a great revolution in the social life of Indians, where mobiles help to connect people, and automobiles help in the mobility of people.

50. What is the name of Tesla's humanoid robot launched in October 2022? [69th B.P.S.C. (Pre) 2023]

(a) Sophia
(b) Atlas
(c) Pepper
(d) Optimus

Correct Answer: (d) Optimus

Solution:Tesla CEO Elon Musk revealed the prototype of its humanoid robot 'Optimus' in October 2022. It was said that Optimus shares some AI software and sensors with Tesla cars' Autopilot driver assistance features. Optimus has the ability to self-calibrate its arms and legs and can locate its limbs in space using vision and joint position encoders.

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