GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 006

GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 006

51). Old-written material, which cannot be read easily, can be read by :
A). cosmic rays
B). ultraviolet rays
C). infrared rays
D). none of these

Answer: infrared rays


   
52). Mesons are found in :
A). y-rays
B). Laser beam
C). X-rays
D). Cosmic rays

Answer: Cosmic rays


   
53). The dark lines in the solar spectrum are due to :
A). absorption of corresponding wavelength by the prism used in the spectrograph
B). destructive interference between waves of certain definite wavelengths
C). absorption of corresponding wavelengths by th outer layers of the sun
D). absence of corresponding wavelengths from the light emitted by the core of
the sun

Answer: absorption of corresponding wavelengths by th outer layers of the sun


   
54). Which of the following is/are examples of electromagnetic waves?
1. X-rays 

2. Ultrasonics 

3. B-rays 

4. a-rays
A). 1 only
B). 2 only
C). 1 and 3
D). 2, 3 and 4

Answer: 1 only


   
55). A moderator is used in nuclear reactors in order to :
A). increase the number of neutrons
B). decrease the number of neutrons
C). slow down the speed of neutrons
D). accelerate the neutrons

Answer: slow down the speed of neutrons



56). In an atomic nucleus, neutrons and protons are held together by :
A). gravitational forces
B). magnetic forces
C). exchange forces
D). columbic forces

Answer: exchange forces


   
57). The wavelength of S-rays is of the order of :
A). 1 cm
B). 1 m
C). 1 Angstrom
D). 10 micron

Answer: 1 Angstrom


   
58). The correct sequence of various regions in absorption spectrum is :
A). Visible, Ultraviolet, microwave, infra red
B). Infra red, gamma rays, ultraviolet, microwaves
C). Ultra violet, visible, infra red, X-rays
D). Microwaves, visible, infra red, X-rays

Answer: Ultra violet, visible, infra red, X-rays


   
59). Which of the following is used as a moderator in nuclear reactor?
A). Ordinary water
B). Radium
C). Thorium
D). Graphite

Answer: Graphite


   
60). Which of the following statements about a refrigerator is/are correct?
1. It converts electrical energy into heat energy.
2. It converts electrical energy into mechanical energy.
3. It transfers heat from a high temperature to a low temperature.
4. It transfers heat from a low temperature to a high temperature.
A). 1 and 3
B). 2 and 3
C). 1 and 4
D). 4 only

Answer: 1 and 4