Q. Concerning the sound waves, consider the following statements:
1. Sound waves do not need any medium and can travel in a vacuum also.
2. Sound waves are longitudinal waves.
3. In sound wave propagation, the particles do not move from one place to another, but they simply oscillate back and forth about their position of rest.
Which of the statements given above is/are correct?
1) 2 and 3 only
2) 1 and 2 only
3) 3 only
4) 1,2 and 3
Q. Which of the following is the least reactive metal?
1) Sodium
2) Calcium
3) Gold
4) Mercury
Q. Burning of coal is an example of -
1) decomposition reaction
2) double displacement reaction
3) combination reaction
4) displacement reaction
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
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