Q. What is the unit of work done?
1) Watt
2) Decibel
3) Ampere
4) Joule
Q. A person wants to separate real gems and artificial gems from a heap. The radiation he should use is -
1) U. V. Radiation
2) Infrared Radiation
3) X-radiation
4) Laser light
Q. A person wrongly used infrared rays to detect a flaw in a machine part. The correct radiation he should have used is -
1) X-ray
2) Ultra-violet ray
3) Micro-wave
4) Visible light
Q. Which one of the following is not the property of an electromagnetic wave?
1) Transverse wave
2) Vacuum is the only perfect transparent medium for propagation
3) Material medium is required for its propagation
4) Radiations of different frequencies react differently with matter
Q. The electron's distribution into the atomic orbitals is called as -
1) Electronic order
2) Electronic distribution
3) Electronic filing
4) Electronic configuration
Q. Which type of elements are poor conductors of heat and electricity?
1) Metals
2) Non-metals
3) Gases
4) None of the above
Q. Which law describes the orbits of planets around the sun?
1) Newton's law
2) Faraday's law
3) Kepler's law
4) Kirchoff's law
Q. Which of the following conditions is most favourable for converting a gas into a liquid?
1) High pressure, low temperature
2) Low pressure, low temperature
3) Low pressure, high temperature
4) High pressure, high temperature
Q. Which of the following techniques cannot be used for generating electron-hole pairs in electronic devices?
1) Thermal excitation
2) Impact ionization
3) Photo excitation
4) Impurity injection
Q. Which of the following diodes is used in ultra-high-speed switching electronic circuits?
1) Zener diode
2) Varactor diode
3) Tunnel diode
4) Schottky diode
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