Bihar Police GK Questions
51. Which of the following substances is a liquid non-metal?
A) Mercury
B) Bromine
C) Water
D) Alcohol
B) Bromine
Explanation: Bromine is a liquid non-metal at room temperature, while mercury is a liquid metal.
52. If sewage is completely oxidized, what form will nitrate take?
A) Nitrite
B) Ammonia
C) Nitramine
D) Nitrate
D) Nitrate
Explanation: Complete oxidation of sewage converts nitrogenous waste into nitrate, which is a stable and oxidized form of nitrogen.
53. What is the acceptable noise pollution limit in India?
A) Between 16 – 35 decibels
B) Between 40 – 45 decibels
C) Between 60 – 80 decibels
D) Between 10 – 15 decibels
C) Between 60 – 80 decibels
Explanation: The acceptable noise pollution levels vary by zone, but a typical acceptable range for industrial areas can go up to 75 decibels during the day.
54. Spraying of Endosulfan on cashew crops led to a major pollution disaster in?
A) Kerala
B) Andhra Pradesh
C) Karnataka
D) Tamil Nadu
A) Kerala
Explanation: The spraying of Endosulfan on cashew plantations in Kerala resulted in a severe environmental and health disaster due to its toxic effects.
55. Transboundary pollution is the cause of acid rain due to?
A) Carbon Monoxide
B) Carbon Dioxide
C) Hydrocarbons
D) Nitrogen Oxides and Sulfur Dioxide
D) Nitrogen Oxides and Sulfur Dioxide
Explanation: Acid rain is primarily caused by the emission of nitrogen oxides (NOx) and sulfur dioxide (SO₂), which react with water vapor in the atmosphere to form acidic compounds.
56. The Milky Way galaxy was first observed by?
A) Galileo
B) Maarten Schmidt
C) Marconi
D) Newton
A) Galileo
Explanation: Galileo Galilei was the first to observe the Milky Way in detail with a telescope, recognizing that it was composed of numerous stars.
57. If we measure the time between two sunsets while sitting on the seashore, what can we estimate from that?
A) Distance between the Sun and Earth
B) Depth of the sea
C) Radius of the Earth
D) Radius of the Sun
C) Radius of the Earth
Explanation: By measuring the time between two sunsets from different points, we can estimate the Earth’s curvature, which can help in calculating the radius of the Earth.
58. Which rocket has provided us with information about Mars?
A) Discovery
B) INSAT 4
C) Atlas 5
D) Cassini
C) Atlas 5
Explanation: Atlas 5 is a launch vehicle used by NASA for various space missions, including those that provide information about Mars.
59. A portable, personal computer small enough to fit in your lap is known as?
A) Notebook computer
B) PDA (Personal Digital Assistant)
C) Mainframe computer
D) Workstation
A) Notebook computer
Explanation: A notebook computer, commonly referred to as a laptop, is a small, portable personal computer designed for mobile use.
60. The garden inside the Taj Mahal is known as?
A) Mughal Garden
B) Taj Garden
C) Taj Mahal Garden
D) Palace Garden
A) Mughal Garden
Explanation: The gardens surrounding the Taj Mahal are designed in the style of traditional Mughal gardens, which include various water channels, walkways, and greenery.