The principle used in radar is the same as that of Sonar In radar we use radio waves ; whereas in sonar we use
(A) red waves
(B) Infrared waves
(C) Ultrasonic
(D) super sonic
(D) None of these
A six feet tall lady wants to see her full image in a plane mirror The minimum length of the mirror will be
(A) 6 feet
(B) 12 feet
(C) 4 feet
(D) 3 feet
(D) None of these
When a ray of sunlight enters a dark room , its straight path become visible because of dust particles hanging in the air It is because light is _________
(A) Visible
(B) Transparent
(C) Invisible
(D) opaque
(D) None of these
It is possible to recognize a person in the dark by simply hearing his unique voice It is because of the_______
(A) pitch
(B) Frequency
(C) Time period
(D) Quality
(D) None of these
The echo (reflected sounD will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________
(A) 1120 ft
(B) 120 ft
(C) 56 ft
(D) 100 ft
(D) None of these
The instrument which i specially design for recording earth quake wave is called seismograph which measure earth quake waves on a ____________
(A) Diatonic scale
(B) Fahrenheit Scale
(C) Richter scale
(D) Celsius Scale
(D) None of these
Myopia is a defect of Human eye it can be corrected by using a lens called
(A) Convex lens
(B) Concave lens
(C) Cylindrical lens
(D) Plano convex lens
(D) None of these
Night vision is possible with the help of ___________
(A) Red light
(B) Violet light
(C) Infrared Rays
(D) Ultra violet Light
(D) None of these
A body can escape the gravitational pull of the earth if it is thrown up with a velocity of
(A) 25 miles per sec
(B) 60 miles per sec
(C) 7 miles per sec
(D) 10 miles per sec
(D) None of these
A nuclear reactor is a device used to carry out controlled nuclear reaction whereas GM counter is a device used to detect
(A) Current
(B) Voltage
(C) Nuclear Radiation
(D) power
(D) None of these