Wired Faculty
i) Why is the mechanical advantage of a lever of the second order always greater than one?
ii) Name the type of single pulley that has a mechanical advantage greater than one.
i) The mechanical advantage of a lever of the second order is always greater because the effort arm is greater than the load arm.
ii) Single movable pulley.
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i) Write a relation expressing the mechanical advantage of a lever.
ii) Write an expression for the mechanical advantage of an inclined plane.
iii) Give two reasons as to why the efficiency of a single movable pulley system is always less than 100%
i) 
ii) M.A. of inclined plane = 
;
where, 
is the length of inclined plane, and
h is the height of the inclined plane.
iii) The two reasons are:
a) The moving parts are not perfectly smooth i.e., frictionless.
b) The string in it is not perfectly elastic.
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i) What is meant by refraction of light?
ii) What is the cause of refraction of light?
i) The deviation in the path of the light when it travels from one medium to the pther is called refraction of light.
ii) Speed of light is different from speed in different mediums.
The refractive index of diamond is 2.42. What is meant by this statement?
It means tht the ratio of speed of light in air to the speed of light in diamond is 2.42.
A stick partly immersed in water appears to be bent. Draw a ray diagram to show the bending of the stick. When placed in water and viewed obliquely from above.
The bending of the stick is as shown in the fig. below:
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Mock Test Series
