Random Questions Part-7

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1)   Danger signals are generally red as red light

  • [A] is least bright
  • [B] undergoes least deviation
  • [C] has lowest velocity
  • [D] gives comfort to eye

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undergoes least deviation

2)   A simple microscope consists of

  • [A] a short focus convex lens
  • [B] a long focus conves lens
  • [C] a short focus concave lens
  • [D] a long focus concave lens

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a short focus convex lens

3)   In which of the following cases, Kinetic energy is being used in performing work ?

  • [A] Paddling the bicycle to cover a distance
  • [B] Driving a car to cover a distance
  • [C] Wind mill grinding wheat grain
  • [D] Rowing a boat in the lake

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Driving a car to cover a distance

4)   Heat from the Sun reaches the Earth by

  • [A] Relection
  • [B] Conduction
  • [C] Radiation
  • [D] Convection

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Radiation

5)   The term EQUINOX means

  • [A] The path which the earth takes around the sun
  • [B] The axis of the earth around which it rotates
  • [C] When the day and night are of equal duration
  • [D] The time when the sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

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When the day and night are of equal duration

6)   The different colors of different stars are due to the variation of

  • [A] temperature
  • [B] pressure
  • [C] density
  • [D] radiation from then

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temperature

7)   The instrument that measures and records the relative humidity of air is

  • [A] Hydrometer
  • [B] Hygrometer
  • [C] Lactometer
  • [D] Barometer

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Hygrometer

8)   What principle/law explains the working of the hydraulic brakes in automobiles ?

  • [A] Bernoulli law
  • [B] Posieulle Principle
  • [C] Pascal law
  • [D] Archimedes Principle

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Pascal law

9)   Which of the following is used for regulated power supply ?

  • [A] zener diode
  • [B] junction diode
  • [C] gunn diode
  • [D] tunnel diode

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zener diode

10)   What apparatus is used to locate a submerged object ?

  • [A] Radar
  • [B] Sonar
  • [C] Quasar
  • [D] Pulsar

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Sonar

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