43
In an ideal wheel an axle system, R stand for the radius of the wheel and r is the radius of the axle. the mechanical advantage is
- A. (R/r)2
- B. r/R
- C. (r/R)2
- D. R/r
44
The pair of physical quantities consisting of vectors only are
- A. momentum and power
- B. velocity and distance
- C. displacement and torque
- D. accelaration and speed
45
A real image three times the size of an object is formed 24cm from a converging mirror. what is the focal length of the mirror.
- A. 16cm
- B. 6cm
- C. 8cm
- D. 12cm
46
A thin converging lens has a power of 4.0 diopters determined its focal length.
- A. 2.50m
- B. 0.03m
- C. 5.00m
- D. 0.25m
47
The sharpness of the boundary of the shadow of an object is determined by the
- A. intensity of light striking the object
- B. rays of light passing through the object
- C. nature of the object
- D. opacity of the object
48
Marching soldiers crossing a suspension bridge are usually advised to break their steps to avoid damaging the bridge owing to
- A. oscillation
- B. resonance
- C. swinging
- D. vibration