Physics Question Answer

Q16. In SONAR which kind of wave is used
(a) Infrasonic
(b) Ultrasonic
(c) Radio
(d) Audible sound

Q17. Which one type of radiation has the longest wave length
(a) Infrared
(b) Ultraviolet
(c) X-ray
(d) Radio Wave

Q18. Which one of the following ray has minimum wavelength
(a) Gamma ray
(b) Cosmic ray
(c) Utraviolet ray
(d) X-rays

Q19. Who discovered X-ray
(a) Marie Curie
(b) Pierre Curie
(c) Wilhelm Rontgen
(d) Ernest Rutherford

Q20. According to the quantum theory of light, the energy of light is carried in discrete units are called
(a) Photoelectrons
(b) Protons
(c) Electrons
(d) Photons

Q21. The energy of a photon varies directly with its
(a) Wave length
(b) Frequency
(c) Speed
(d) None of the above

Q22. The unit of intensity of electric field is
(a) N/c
(b) N/m
(c) J/c
(d) volt

Q23. Which physicists is the writer of the book 'A Brief History of Time'
(a) Isaac Newton
(b) Hans Bethe
(c) Albert Einstein
(d) Stephen Hawking

Q24. Who gave black hole theory
(a) Albert Einstein
(b) Stephen Hawking
(c) Isaac Newton
(d) None of the above

Q25. What is the gravity of moon as compared to the Earth
(a) 1/4 th of Earth
(b) 1/5 th of Earth
(c) 1/6 th of Earth
(d) 1/8 th of Earth

Q26.Who is known as the 'father of quantum theory'
(a) Albert Einstein
(b) Max Planck
(c) Werner Heisenberg
(d) Ernest Rutherford

Q27.The speed of sound travel fastest through
(a) Liquid
(b) Solid
(c) Gas
(d) None of the above

Q28.Which one is not a part of Kepler's Law
(a) Law of orbits
(b) Law of areas
(c) Law of speed
(d) Law of periods

Q29.Ultrasound devices operate with minimum frequency from
(a) 20kHz
(b) 35 kHz
(c) 45 kHz
(d) 60 kHz

Q30. Infrasonic sound has a frequency lower than
(a) 5 Hz
(b) 15 Hz
(c) 20 Hz
(d) 32 Hz

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