861. The power we use at Home has a frequency of 60Hz. What would be the period of the sine wave?
A. 0.116 seconds
B. 0.0116 seconds
C. 0.00116 secon
D. 0.0016 Microseconds
✅ The correct answer is option B.
SSC
862. SOFAR is a phenomenon which plays an important role in submarine warfare & also known as deep sound channel. Which of the following is correct full form of SOFAR?
A. Sound Field Radio Ranging
B. Sound Fixing and Altering Range
C. Sound Fixing and Ranging channel
D. Sound Fixing and Auto Reflection
✅ The correct answer is option C.
863. In context with electromagnetism, which among the following is a correct definition of Permeability?
A. Ability of a material to repel magnetic field within itself
B. Ability of a material to support the formation of a magnetic field within another body
C. Ability of a material to support the formation of a magnetic field within itself
D. Ability of a material to create magnetic dipoles
✅ The correct answer is option C.
864. Consider the following advantages of the Optic Fibers and the Copper wires: Optic Fibers are NOT susceptible to the electrical interference Optic Fibers can be used to transmit more signals that Copper Wires Optic Fibers can carry a signal over a single fiber, unlike the electricity which requires a pair of Copper wires. Which among the above stand correct ?
A. Only 1 is correct
B. Only 1 & 2 are correct
C. All 1, 2 & 3 are correct
D. Only 3 is correct
✅ The correct answer is option C.
865. Ballistics is a branch of science that deals with which of the following?
A. Geologic study of the behavior of soil and rock
B. Motion of multibody systems subjected to unilateral contacts and friction
C. Flight, behavior, and effects of projectiles
D. Kinetic energy of a system
✅ The correct answer is option C.
866. An electrical fuse is used to interrupt excessive________?
A. Voltage
B. Current
C. Resistance
D. Inductance
✅ The correct answer is option B.
867. Consider the following: 1. Submarine Communications 2. AM Radio 3. Short Wave Radio 4. Radar Arrange the above in increasing frequency of the waves used in their applications.
A. 4 3 2 1
B. 1 2 3 4
C. 2 1 4 3
D. 2 3 4 1
✅ The correct answer is option B.
868. Which among the following comes under the study area of Psychrometrics?
A. Relative Humidity
B. physical and thermodynamic properties of gas-vapor mixtures
C. theory and technique of educational and psychological measurement
D. Atmospheric Pressure at Colder Regions of the World
✅ The correct answer is option B.
869. Which among the following component of a fluorescent lamp contributes maximum in making them costly?
A. Mercury vapor
B. Light-emitting phosphors
C. Ballast
D. Filament
✅ The correct answer is option C.
870. Which among the following correctly represents a Parsec?
A. 0.326 Light Years
B. 3.261 Light Years
C. 32.61 Light Years
D. 3.026 Light Years
✅ The correct answer is option B.