Science

Q.1. Very small time intervals are accurately measure by
A. White dwarfs
B. Quartz clocks
C. Atomic clocks
D. Pulsars
Ans. Atomic clocks

Q.2. Which of the following is used as a moderator in nuclear reactor?
A. Thorium
B. Graphite
C. Radium
D. Ordinary water
Ans. Ordinary water

Q.3. The reason behind decrease in the boiling point of water at higher altitudes is :
A. high temperature
B low temperature
C high atmospheric pressure
D low atmospheric pressure
Ans. Low atmospheric pressure

Q.4. Ocean depth can be measured by
A. Fathometer
B. Audiometer
C. Actinometer
D. Barkometer
Ans. Fathometer

Q.5. The colours of stars depend on
A. Distance
B. Temperature
C. Litmospheric pressure
D. Pollutants of air
Ans. Temperature

Q.6. Golden view of sea shell is due to
A. Diffraction
B. Reflection
C. Refraction
D. Polarization
Ans. Polarization

Q.7. Ball pen functions on the principle of
A. Lenz's law
B. Surface tension
C. Doppler effect
D. Gravitional force
Ans. Surface tension

Q.8. Which of the following is used for sun glasses ?
A. Crooks glass
B. Pyrex glass
C. Crystal glass
D. None of the above
Ans. Crooks glass

Q.9. The sky appears blue because  of
A. Mie scattering
B. Back scattering
C. Rayleigh scattering
D. None of these
Ans. Rayleigh scattering

Q.10. Radioactive elements can be traced out in living cell through a technique called
A. Chromatography
B. Auto radiography
C. Centrifugation
D. None
Ans. Auto radiography                        

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