The equation θ = 1.22 λ/D was devised by_______________?
The equation θ = 1.22 λ/D was devised by_______________?
A. Newton
B. Einstein
C. Raleigh
D. Planks
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A lens which converges a beam of parallel rays to a point is called______________?
A lens which converges a beam of parallel rays to a point is called______________?A. diverging (or concave) lens
B. converging (or convex) lens
C. plano concave lens
D. plano convex lensLight reaches the earth form sun in nearly____________________?
Light reaches the earth form sun in nearly____________________?A. 15 minutes
B. 10 minutes
C. 8 minutes
D. 8 minutes 30 secondsWaves emitted from the antenna are__________________?
Waves emitted from the antenna are__________________?A. Sound waves
B. Electromagnetic waves
C. Radio waves
D. Modulated wavesGeostationary satellite completes one rotation around the earth in_______________?
Geostationary satellite completes one rotation around the earth in_______________?A. 3 hours
B. 6 hours
C. 12 hours
D. 24 hoursThe acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?
The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?A. -1
B. 1
C. 2
D. -2Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?
Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?A. Each increase
B. Each decrease
C. Each remains the same
D. One increases whereas that in the other decreases