GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 053

GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 053

521). Consider the following statements :
Assertion (A) : We see only one side of the moon all the time. 

Reason (R) : Unlike the earth, the moon does not rotate on its axis.
Select the answer from coding scheme given below :
A). (A) is true, but (R) is false
B). (A) is false, but (R) is true
C). Both (A) and (R) are true but (R) is not the correct explanation of (A)
D). Both (A) and (R) are false

Answer: (A) is true, but (R) is false


   
522). Electron microscopy is advantageous because
A). much greater resolution is possible
B). electrons are used as a source of radiation
C). transmission and scanning types are available
D). all the above mentioned features are combined

Answer: all the above mentioned features are combined


   
523). The phenomenon which cannot be explained by wave theory is
A). reflection
B). refraction
C). photoelectric emission
D). polarisation

Answer: photoelectric emission


   
524). The size of the atomic nucleus is
A). 10-14
B). 10-10
C). 10-24
D). 10-6

Answer: 10-14



   
525). The half life of a radioactive sample is 20 minutes. The fraction of the sample that will remain undecayed after 80 minute is
A). 116
B). 112
C). 18
D). 14

Answer: 116




526). The sudden fall of atmospheric pressure indicates
A). fair weather
B). storm
C). rain
D). cold wave

Answer: storm


   
527). Electrons can be accelerated to very high energies by means of
A). thyratrons
B). magnetrons
C). betatrons
D). cyclotrons

Answer: betatrons


   
528). Who discovered x-ray?
A). Madam Curie
B). Einstein
C). Roentgen
D). Thomson

Answer: Roentgen

   
529). Polariods are used in
A). photo electric effect
B). photo - elasticity
C). photo electric cell
D). photosynthesis

Answer: photo - elasticity


   
530). Pure silicon is used in
A). Electronic industry
B). Textile industry
C). Paint industry
D). Pharmaceuticals

Answer: Electronic industry