CSIR NET JRF Paper-I (Part 5 of 5)

  • In diesel engines, ignition takes place by-Compression
  • Cloudy nights are warmer because-Clouds prevent radiation of heat from the ground into the air
  • A electric bulb produce a loud sound when broken because-the air rushes into partial vaccum in the bulb
  • What is the approximate velocity of sound in air-800m/s.
  • In deserts, clouds do not precipitate because of-low humidity.
  • The ink of a pen leaks out in an aeroplane because-pressure of ink inside is more than the ambient pressure
  • Coating of iron with zinc is known as-Galvanization
  • A piece of rock was brought from moon to earth, then-Its weight alone changed
  • Which of the following is not a primary colour-Black
  • Which falls down faster in a vacuum-All with fall down at same speed in a vacuum because there will be no air resistance.
  • Atmospheric pressure is measured by using an instrument call a/an-barometer
  • The process of transfer of heat by matter but without actual movement of particle then selves is called-Conduction
  • In an electric kettle water becomes hot by-Convection
  • Tea will cool most easily in a-Metal cup
  • The source of solar energy is-Nuclear fusion
  • A radar that detect the presence of an enemy aircraft uses-Radio waves
  • Light year is a unit of-Distance
  • What is normal temp, of a human body-370 c
  • A Celsius and a Fahrenheit thermometer give the same reading at a particular temperature is (-40C)
  • In which atmospheric layer are the communication satellites located? -Ionosphere
  • In an earthen pot, cooling of water depends upon the-All the above
  • A fuse wire used to-Prevent an unduly high electric current from passing through a circuit
  • The nucleus of an atom consists of-Proton + electron
  • What happen if water is cooled from 80C to 0C? -its volume decrease up to 40C and then Increase
  • Which of the following is a good conductor of heat but bad conductor of electricity-Mica
  • A sudden fall in a barometer reading indicates-Storm
  • Sound travel with a different speed in different media. In what order does the velocity of sound increase in these media? -Air, water and iron
  • Which part of the sun is visible during total solar eclipse? -Corona
  • When a pencil is partly immersed in water in a beaker and held in a slanting position, the immersed portion appears-Bent towards the water surface
  • The three primary colour are-Blue, green, and red
  • Which part of a camera is analogous to the retina in the human eye? -Film
  • When a person walking in bring sunlight enter a dark room, he is not able to see clearly for a little while because-the iris unable to dilate the pupil immediately
  • In electric fittings, the wires are earthed because-In case of a short circuit, current passes to the earth.
  • To an astronaut, the outer space appears-Black
  • Which of the following metal is used in aircraft? -Palladium
  • A transformer is used to-Increase of decrease AC voltage
  • The element used in an electric filament is-Tungsten
  • The sky is blue in colour due to-dispersion
  • When a ship floats on water-The mass of water displaced is equal to the mass of the ship