Science & Tech

3 questions

• 2021 · Question 68 · Physics

  In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following? 1. Area of the hole in the lid 2. Temperature of the flame 3. Weight of the lid Select the correct answer using the code given below.

  Choose your answer

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

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  Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)

• 2021 · Question 72 · Physics

  With reference to street-lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street-lights, sodium lamps have longer life span than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting. Select the correct answer using the code given below.

  Choose your answer

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

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  Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)

• 2021 · Question 76 · Physics

  Which one of the following is a reason why astronomical distances are measured in light-years?

  Choose your answer

  (a)Distances among stellar bodies do not change.(b)Gravity of stellar bodies does not change.(c)Light always travels in straight line.(d)Speed of light is always same.

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  Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)