A satellite revolving around the earth is kept on its orbit by?
Centripetal forces only
Centripetal and frictional forces
Centrifugal forces only
Centripetal and centrifugal forces
Correct answer is A
The concept of centrifugal force can be applied in rotating devices, such as centrifuges, centrifugal pumps, centrifugal governors, and centrifugal clutches, and in centrifugal railways, planetary orbits and banked curves, when they are analyzed in a rotating coordinate system
Which of the following statements about wave motion is correct?
Electromagnetic waves are transverse
Transverse waves do not require a medium for propagation
Longitudinal waves vibrate perpendicular to the direction of travel
All mechanical waves are longitudinal
Correct answer is A
No explanation has been provided for this answer.
Which of the following instruments can be used to measure current in an a.c circuit?
Hot wire ammeter
Moving coil ammeter
Tangent galvanometer
Moving coil galvanometer
Correct answer is D
No explanation has been provided for this answer.
Which of the following is obtained when a magenta is mixed with green colour?
Yellow
Blue
White
Red
Correct answer is C
No explanation has been provided for this answer.
Shadows and eclipse result from the
Reflection of light
Rectilinear propagation of light
Diffraction of light
Refraction of light
Correct answer is B
No explanation has been provided for this answer.