General Science Questions and Answers

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Q71
Which of the following best explains the phenomenon ‘Simple Harmonic Motion’?
  • A Cylinder
  • B Disc
  • C Pendulum
  • D None of these
Answer: Option C
Q72
Jet engines are
  • A rotary engines
  • B turbine engines
  • C external combustion engines
  • D reaction engines
Answer: Option C
Q73
In an engine run on diesel, ignition is caused through
  • A friction
  • B automatic starter
  • C spark plug
  • D compression
Answer: Option D
Q74
In an electronic watch, the component corresponding to the pendulum of a pendulum clock is
  • A Transistor
  • B Balance Wheel
  • C Crystal Oscillator
  • D Diode
Answer: Option C
Q75
The hydraulic brakes used in automobiles is a direct application of ?
  • A Archimedes’ Principle
  • B Toricellian law
  • C Bernoulli’s theorem
  • D Pascal’s law
Answer: Option D
Q76
Which of the following statements is correct?
  • A Dynamo converts electrical energy into heat energy and electric motor converts mechanical energy into electrical energy.
  • B Dynamo converts mechanical energy into electrical energy and electric motor converts electrical energy into mechanical energy.
  • C Both dynamo and electric motor convert electrical energy into mechanical energy.
  • D Both dynamo and electric motor convert mechanical energy into electrical energy.
Answer: Option B
Q77
An electron microscope gives higher magnification than an optical microscope because
  • A it uses more powerful lenses.
  • B the velocity of electrons is smaller than that of visible light.
  • C the electrons have more energy than the light particles.
  • D the wavelength of electrons is smaller as compared to the wavelength of visible light.
Answer: Option D
Q78
The conversion of electrical energy into chemical energy is observed in ?
  • A fan
  • B storage battery
  • C heater
  • D incandescent bulb
Answer: Option B
Q79
The most efficient engine is ?
  • A Petrol
  • B Diesel
  • C Electric
  • D Steam
Answer: Option C
Q80
The tape of a tape recorder is coated with
  • A Zinc oxide
  • B Copper sulphate
  • C Mica
  • D Ferromagnetic powder
Answer: Option D

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