1141. The procedure of crushing the gallstone and kidney stone by laser is called ?
B. Kidney surgery
D. Lithotropsy *
1142. Three dimensional image formed by laser is __________.
B. Hologram *
C. Two dimension sketch
1143. Optical fibres are the fine strands of ____________.
A. Glass *
1144. The satellite which revolve in such an orbit, so that they move with earth rotation are called __________.
A. Geo satellites
B. Stationary satellites
C. Earth-space satellites
D. Geo-stationary satellites *
1145. Radar transmits short pulses of high frequency called ________.
A. Infrared waves
B. Radio waves *
C. Ultraviolet waves
D. Sound waves
1146. The ray with high penetration power is _________.
C. Y-Rays *
1147.The penetration of x-rays through an object depends upon the object’s _________.
A. Density *
1148. To find the hidden secrets under the water the ships and submarines use the _________.
A. Radiation system
B. Sonar system *
C. X-ray system
D. Radiation system
1149. Recording of brain waves from outer surface of head is called ________.
D. E.E.G *
1150. Ball bearings are used in cycles , scooters ETC to _________.
A. Reduce the friction between the wheel and the axle. *
B. Increase the friction between the wheel and the axle
C. Reduce the friction between ground and the wheel
D. None of these