GK-General Science Question and Answer
GK-General Science Question and Answer
71. Which of the following best explains the phenomenon ‘Simple Harmonic Motion’?
- Cylinder
- Disc
- Pendulum
- None of these
72. Jet engines are
- rotary engines
- turbine engines
- external combustion engines
- reaction engines
73. In an engine run on diesel, ignition is caused through
- friction
- automatic starter
- spark plug
- compression
74. In an electronic watch, the component corresponding to the pendulum of a pendulum clock is
- Transistor
- Balance Wheel
- Crystal Oscillator
- Diode
75. The hydraulic brakes used in automobiles is a direct application of ?
- Archimedes’ Principle
- Toricellian law
- Bernoulli’s theorem
- Pascal’s law
76. Which of the following statements is correct?
- Dynamo converts electrical energy into heat energy and electric motor converts mechanical energy into electrical energy.
- Dynamo converts mechanical energy into electrical energy and electric motor converts electrical energy into mechanical energy.
- Both dynamo and electric motor convert electrical energy into mechanical energy.
- Both dynamo and electric motor convert mechanical energy into electrical energy.
77. An electron microscope gives higher magnification than an optical microscope because
- it uses more powerful lenses.
- the velocity of electrons is smaller than that of visible light.
- the electrons have more energy than the light particles.
- the wavelength of electrons is smaller as compared to the wavelength of visible light.
78. The conversion of electrical energy into chemical energy is observed in ?
- fan
- storage battery
- heater
- incandescent bulb
80. The tape of a tape recorder is coated with
- Zinc oxide
- Copper sulphate
- Mica
- Ferromagnetic powder