Wednesday, 2 March 2016

General Science Physics -8

101. Water is used in hot water bags because:
(a) It is easily obtained
(b) It is cheaper and not harmful
(c) It has high specific heat
(d) It is easy to heat water
Answer: (c)

102. Pressure cooker cooks rice faster because:
(a) It always let the steam escape
(b) High pressure crushes the hard covering of rice grains
(c) It does not let the heat energy escape easily
(d) High pressure raises the boiling point of water
Answer: (d)

103. Light from Alpha Century, which is one of the nearest star to the sun, reaches the earth on:
(a) 4.2 seconds     (b) 42 seconds
(c) 4.2 years          (d) 42 years
Answer: (c)

104. Mach number is used in connection with the speed of
(a) Sound               (b) Aircraft
(c) Spacecraft        (d) Ship
Answer: (b)

105. Water drops cannot stick to the oily surface due to:
(a) Lack of adhesive force                 
(b) Surface tension
(c) Cannot mix each other                
(d) Water is lighter than oil
Answer: (a)

106. Stars which appear single to the naked eye but are double when seen through a telescope are:
(a) Novas and supernovas      (b) Asteroids
(c) Quasars                                 (d) Binaries
Answer: (d)

107. Which one of the following is the best fuel in terms of energy released per gram of fuel?
(a) Hydrogen (b) Methane
(c) Ethanol (d) Butane
Answer: (a)

108…………measure the viscosity of liquids:
(a) Vernier                        (b) Viscometer
(c) Ultrasonoscope        (d) Udometer
Answer: (b)

109.Which is not related to Edison?
(a) Cinematograph               (b) Gramophone
(c) Neon lamp                        (d) Electric Lamp
Answer: (c)

110. A body falling freely from a height towards the earth moves with uniform:
(a) Speed                    (b) Velocity
(c) Acceleration        (d) Weight
Answer: (c)

111.Radio telescopes are better than optical telescopes because:
(a) they can work even in cloudy conditions
(b) they can work during the day and night
(c) they can detect faint galaxies which no optical telescope can
(d) All of the above
Answer: (d)

112. It is easier to roll a barrel full of coal tar than to pull it because:
(a) The full weight of the barrel comes into play when it is pulled
(b) The rolling friction is less than the sliding friction
(c) More surface area of the barrel is in contact with the raod when it is pulled
(d) Coal tar is a liquid and flows in the barrel when it is rolled
Answer: (b)

113.Large astronomical telescopes always use as objective:
(a) Lens                                           (b) Mirror
(g) combinations of lenses         (d) None of these
Answer: (c)

 114.Supersonic plane fly with the speed:
(a) less than the speed of sound
(b) speed of sound
(c) greater than the speed of sound
(d) greater than the speed of light    
Answer: (c)

115. A weather balloon is not fully inflated on the ground because:
(a) If the balloon is fully inflated it may not remain firm in a storm
(b) The air inside the balloon expands as it rises and may 'burst
(c) It cannot withstand the outside pressure it fully inflated

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