Science Technology Questions Answers

51. What is the pH value of human blood?

  • A) 6.5
  • B) 7.4
  • C) 8.0
  • D) 8.5
Answer: 7.4

52. Who was the first to discover infrared rays?

  • A) Herschel
  • B) Newton
  • C) Einstein
  • D) Planck
Answer: Herschel

53. Which material is commonly used in a breathalyzer to detect alcohol?

  • A) Potassium dichromate crystals
  • B) Sodium bicarbonate
  • C) Calcium chloride
  • D) Magnesium sulfate
Answer: Potassium dichromate crystals

54. Between which planets are asteroids primarily found?

  • A) Mercury and Venus
  • B) Venus and Earth
  • C) Earth and Mars
  • D) Mars and Jupiter
Answer: Mars and Jupiter

55. Which part of the eye adjusts the lens to focus on objects at different distances?

  • A) Iris
  • B) Ciliary muscles
  • C) Retina
  • D) Cornea
Answer: Ciliary muscles

56. A mirage is an example of which optical phenomenon?

  • A) Refraction
  • B) Total internal reflection
  • C) Dispersion
  • D) Polarization
Answer: Total internal reflection

57. Which of the following is not an explosive substance?

  • A) Nitroglycerin
  • B) Trinitrotoluene
  • C) RDX
  • D) Nitrochloroform
Answer: Nitrochloroform

58. Which substance is used as a petrol additive?

  • A) Ethanol
  • B) Tetraethyl Lead
  • C) Barium Sulfate
  • D) Methyl Alcohol
Answer: Tetraethyl Lead

59. Electronvolt is a unit of what?

  • A) Energy
  • B) Electric current
  • C) Resistance
  • D) Capacitance
Answer: Energy

60. From which mineral is radium obtained?

  • A) Calcite
  • B) Magnetite
  • C) Pitchblende
  • D) Gypsum
Answer: Pitchblende
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