SSC CGL 2017 Special : Physics Questions from Previous Papers - Set 2

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1. Surface tension in a liquid is due to :
   1. Adhesive force between molecules
   2. Cohesive force between molecules
   3. Gravitational force between molecules
   4. Electrical force between molecules

• A circular plate, a cube and  a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling ?
• 1. Circular plate
     
  2. Cube
  3. Sphere
  4. All will cool at the same rate
• Optic fibres are used in ?
• 1. CAT scans
  2. X-ray photos
  3. Ultrasound Scans
  4. Endoscopy
• Two waves, each of amplitude 1.5 mm and frequency 10Zz, are traveling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is :
• 1. 1.0
  2. 1.2
  3. 1.5
  4. 2.0
• The snow on the mountains does NOT melt all at once when it is heated by the sun because :
• 1. it becomes very hard
  2. it reflects most of the heat from the sun
  3. it has a low specific heat capacity
  4. it has a high latent heat of fusion
• A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is 
• 1. the same in both cases in all respects
  2. of higher intensity when train arrives
  3. of higher pitch when train arrives
  4. of higher pitch when train departs
• Holography is a technique of 
• 1. recording a permanent, sharp tow dimensional black and white or multicolour photograph
  2. recording a permanent three dimensional multicolour pohtograph
  3. recording a permanent three dimensional black and white photograph
  4. recording a permanent three dimensional photograph of a given single colour or a multicolour
• The velocity of sound in moist air is more than in dry air because the moist air has 
• 1. less density than dry air
  2. less pressure than dry air
  3. more pressure than dry air
  4. more density than dry air
• An ice block with a piece of lead embedded in it floats in water. If ice melts the water level
• 1. rises
  2. falls
  3. remains same
  4. falls first and then rises
• The velocity of heat radiation in vacuum is 
• 1. equal to that of light
  2. less than that of light
  3. greater than that of light
  4. equal to that of sound
• The plastic material commonly used for making gear wheels is 
• 1. polyesters
  2. nylons
  3. bakelit
  4. polystyerene
• Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by
• 1. carbon dioxide
  2. ammonia
  3. chlorine
  4. ozone
• "Curie" is a unit of :
• 1. Radioactivity
  2. Temperature 
  3. Heat
  4. Energy
• Which of the following is used in oven ?
• 1. X-rays
  2. UV rays
  3. Microwaves
  4. Radiowaves
• When heated from 0° to 10°C volume of a given mass of water will :
• 1. increase gradually
  2. decrease gradually
  3. increase and then will decrease
  4. decrease and then will increase

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