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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
Comment
Answer is: A

562.

The frequency band used for radar relay systems and television is
(a)VLF
(b)UHF
(c)VHF
(d)EHF
Comment
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
Comment
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
Comment
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
Comment
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
Comment
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
Comment
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
Comment
Answer is: C

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