Page 337 - General Knowledge

GENERAL KNOWLEDGE 2019

137. Through which device the illumination and intensity of two light sources are
compared?
A. Pyrometer
B. Phototeligraphic
C. Photometer
D. Periscope

138. Name a device through which the truthness of the human being is examined?
A. Paicnometer
B. Quadrant
C. Polygraph
D. Radiometer

139. Which devise is used to measure the intensity of the earthquake?
A. Seismograph
B. Oscilliograph
C. Comograph
D. Cardiograph

140. Which device is used to listen the vibrations of the heart and lungs?
A. Spectroscope
B. Stethoscope
C. Stereoscope
D. None of the above

141. Who discovered the magnetic field of current?
A. William Gilbert
B. Hans Christian Oersted
C. Benjamin Franklin
D. Charles Augustin de Coulomb

142. Magnetic effect of current gives rise to which force?
A. Mechanical
B. Friction
C. Spring
D. Gravitational

143. Magnetic effect around a wire is due to:
A. The presence of metal
B. Current flowing in it
C. Circular loop
D. No current in it

144. Which of the following utilise magnetic effect of current?
A. Electric motor
B. Telephone

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