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6 questions · 2008 · answers as per the UPSC key

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UPSC 2008 · Q111 · Science & Technology › Physics · Save

Which one of the following laser types is used in a laser printer?

(a) Dye laser
(b) Gas laser
(c) Semiconductor laser
(d) Excimer laser
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Answer: (c) Semiconductor laser
UPSC 2008 · Q112 · Science & Technology › Physics · Save

Consider the following statements:

  1. A widely used musical scale called diatonic scale has seven frequencies.
  2. The frequency of the note Sa (स) is 256 Hz and that of Ni (नी) is 512 Hz.

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
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Answer: (a) 1 only
UPSC 2008 · Q126 · Science & Technology › Physics · Save

How can the height of a person who is six feet tall be expressed (approximately) in nanometres?

(a) 183 × 10⁶ nanometres
(b) 234 × 10⁶ nanometres
(c) 183 × 10⁷ nanometres
(d) 234 × 10⁷ nanometres
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Answer: (c) 183 × 10⁷ nanometres
UPSC 2008 · Q127 · Science & Technology › Physics · Save

A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?

(a) It will be greater than R
(b) It will be less than R
(c) It will be equal to R
(d) It shall depend on the material of the road
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Answer: (c) It will be equal to R
UPSC 2008 · Q133 · Science & Technology › Physics · Save

Assertion (A): In the visible spectrum of light, red light is more energetic than green light.

Reason (R): The wavelength of red light is more than that of green light.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
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Answer: (d) A is false but R is true
UPSC 2008 · Q134 · Science & Technology › Physics · Save

Assertion (A): Radio waves bend in a magnetic field.

Reason (R): Radio waves are electromagnetic in nature.

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