Physics - Questions and AnswersPage 57
561. | | Which of the following satellite is used in ship to shore and shore to shore and shore to ship communication? | | (a)Merisat | | (b)Comsat | | (c)Telestar | | (d)Intelsat |
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Answer is: A
562. | | The frequency band used for radar relay systems and television is | | (a)VLF | | (b)UHF | | (c)VHF | | (d)EHF |
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Answer is: B
563. | | Which of the following statement is correct? | | (a)Two isobars always have the same mass number | | (b)Two isotopes always have the same mass number | | (c)Two isotones always have same mass number | | (d)Two isobars always have same atomic number |
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Answer is: A
564. | | Resistivity of semiconductor depends on | | (a)Length of semiconductor | | (b)Shape of semiconductor | | (c)Atomic nature of semiconductor | | (d)Shape and atomic nature of semiconductor |
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Answer is: C
565. | | The beta rays in a radioactive destination is similar to | | (a)Cathode ray | | (b)Anode ray | | (c)Alpha ray | | (d)Gamma ray |
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Answer is: A
566. | Doping of semiconductor
1. Increases its conductivity
2. Decreases its conductivity
3. Increases its resistivity
4. Decreases its resistivity
Which option is correct? | | (a)Only 1 | | (b)Only 2 | | (c)2 and 3 | | (d)1 and 4 |
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Answer is: D
567. | | For a given light wave incident on metal surface kinetic energy of photo electron | | (a)Depends on the work function for the metal | | (b)Does not depends on the work function for the metal | | (c)Depends on the intensity of light | | (d)Only 1 and 3 |
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Answer is: A
568. | Consider the statements
1. Photon is a particle of light.
2. Mass of photon is not defined.
3. Speed of photon is as the speed of light.
4. Photons are charged.
Which options are correct? | | (a)1 and 2 | | (b)1, 2, 3 and 4 | | (c)1, 2 and 3 | | (d)1 and 3 |
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Answer is: C
569. | | Planets are | | (a)Luminous heavenly bodies revolving around a star | | (b)Luminous heavenly bodies that do not twinkle | | (c)Non-luminous heavenly bodies | | (d)Luminous heavenly bodies that twinkle |
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Answer is: CA planet is an astronomical body orbiting a star that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals
570. | | Natural radioactivity was discovered by | | (a)Ernest Rutherford | | (b)Enrico Fermi | | (c)Marie Curie | | (d)Henri Becquerel |
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Answer is: DIn 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
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