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CSAT Prelims Physics - General Knowledge Questions and Answers for UPSC Exam | Page-5

41 What does the term Dolby B or Dolby C printed on tape-recorders and other sound systems refer to:
A noise reduction circuit
B frequency modulated system
C amplitude modulated system
D both DC and AC power can be used

Answer: Option [A]
42 Cryogenic engines find application is:
A frost-free refrigerators
B sub-marine propulsion
C rocket technology
D research in superconductivity

Answer: Option [C]


43 The tail of a comet is directed away from the sun because:
A the tail of the comet always exists in the same orientation.
B as the comet rotates around the sun, the lighter mass of the comet is pushed away due to the centrifugal force alone.
C as the comet rotates, the lighter mass of the comet is attracted by some stars situated in the direction of its tail.
D the radiation emitted by the sun exerts a radial pressure on the comet throwing its tail away from the sun

Answer: Option [D]
44 The efforts to detect the existence of Higgs boson particle have become frequent news in the recent past. What is/are the importance/importances of discovering this particle ?
I. It will enable us to understand as to why elementary particles have mass.
II. It will enable us in the near future to develop the technology of transferring matter from one point to another without traversing the physical space between them.
III. It will enable us to create better fuels for nuclear fission.

Select the correct answer using the codes given below.

A I only
B II and III only
C I and III
D I, II and III

Answer: Option [A]
45 Which one of the following does a TV remote control unit use to operate a TV set ?
A Micro waves
B Sound waves
C Light waves
D Radio waves

Answer: Option [D]
46 Which one of the following is paramagnetic in nature ?
A Iron
B Hydrogen
C Oxygen
D Nitrogen

Answer: Option [C]
47 Consider the following natural phenomena:
I. Terrestrial heating
II. Reflection of light
III. Refraction of light
IV. Diffraction of light

Due to which of these phenomena is a mirage formed ?

A I and II
B II, III, and IV
C I and III
D IV only

Answer: Option [B]
48 Consider the following statements:
I. If magenta and yellow coloured circles intersect, the intersected area will have red colour.
II. If cyan and magenta coloured circles intersect, the intersected area will have blue colour.

Which of the statements given above is/are correct ?

A I only
B II only
C Both I and II
D Neither I nor II

Answer: Option [C]
49 Which one of the following types of waves are used in a night vision apparatus ?
A Infra-red waves
B Microwaves
C Radio waves
D None of the above

Answer: Option [A]
50 When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in:
A quality only
B loudness only
C pitch and loudness
D pitch, loudness and quality

Answer: Option [A]

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