GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 107

GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 107

1061). The apparent change in frequency due to a relative motion between the source and the observes is known as
A). Resonance
B). Doppler's principle
C). Beats
D). none of these

Answer: Doppler's principle


   
1062). Instrument used to see objects when they are hidden from direct view is known as
A). periscope
B). telescope
C). microscope
D). spectrometer

Answer: periscope


   
1063). In traffic signals, red light is used to caution against danger ahead. This is because,
A). blood is red in colour
B). eye has maximum sensitivity for red
C). the amount of scattering is maximum for red
D). the amount of scattering is minimum for red

Answer: eye has maximum sensitivity for red


   
1064). The rate of evaporation depends upon
A). the nature of the liquid
B). temperature of the liquid and air
C). area of the exposed surface of liquid
D). all of these

Answer: all of these


   
1065). The flame of a candle is always upwards irrespective of its position. This is because
A). of convection current of air
B). of the reaction of gravitational force
C). air is a good conductor of heat
D). of the low viscosity of air

Answer: of the reaction of gravitational force



1066). A transformer works on
A). A.C. only
B). D.C. only
C). both A.C and DC
D). high voltage only

Answer: A.C. only


   
1067). A remote control gadget (for T.V. etc) has in it
A). a small electromagnet, that emits electromagnetic waves
B). a small oscillator that emits electric pulses
C). a small transmitter that emits infrared signals
D). none of these

Answer: a small transmitter that emits infrared signals


   
1068). In a nuclear reactor the function of an arrestor is to
A). aid in the fast multiplication of fast moving neutrons
B). slow down the fast moving neutrons
C). absorb the neutrons
D). decrease the fission cross section of the neutrons

Answer: absorb the neutrons


   
1069). An electron microscope is superior to an optical microscope because
A). it has better resolving power
B). it is easy to handle
C). of its low cost
D). of its quickness of observation

Answer: it has better resolving power


   
1070). A particular star has mass twice that of sun. This star will end up eventually as a
A). black hole
B). black dwarf
C). white dwarf
D). red giant

Answer: black hole