Everyday Science (General Knowledge) FPSC Past MCQs Papers

(13) The magnet always points in the same direction, if allowed to move freely i.e. towards North and
South poles, because of:
(a)Gravitational field  (b)  A lot of metal deposits on North and South Poles
(c)Due to attraction of North Pole and repulsion of Western Pole
(d) Earth is a huge magnet (e) None of these.
(14) When sound is reflected from floor, ceiling or a wall, it mixes with the original sound and changes its
complexion, it is called as:
(a)Sound  (b)Echo (c)  Reverberation  (d)Noise  (e)None of these.
(15) The speed of sound in dry air at 20 °C is about:
(a)130 meters per second  (b)  230 meters per second (c) 330 meters per second
(d) 430 meters per second (e) None of these.
(16) The speed of light in vacuum is about:
(a)300 Million meters per second  (b) 300 Million meters per hour
(c) 300 Million kilometers per second  (d) 300 Million kilometers per hour (e) None of these.
(17) The time, light takes from the Sun to reach Earth is:
(a)8 minutes (b)25 minutes  (c)45 minutes  (d) 60 minutes   (e) None of these.
(18) Light from the Sun travels a distance before it reaches the Earth :
(a)50 million Km (b)  100 million Km  (c)  150 million Km
(d) 200 million Km (e) None of these.
(19) The most suitable thermometer for measuring the boiling point of water is:
(a)Mercury thermometer  (b)  Alcohol thermometer (c)Bimetallic thermometer
(d) Liquid crystal thermometer (e) None of these.
(20) The density of water is greatest at:
(a)-32 °C (b)0 °C  (c)  4 °C  (d) 100 °C (e) None of these.
(21) Which one of the following statements is true?
(a)Gases do not conduct heat  (b)The best conductors are non-metals
(c)Conduction currents occur only in liquids (d) A vacuum can not conduct heat
(e)None of the statements is true.