(English Medium) ICSE Class 10 - CISCE Important Questions

Two forces each of 5N act vertically upwards and downwards respectively on the two ends of a uniform metre rule which is placed at its mid-point as shown in the diagram. Determine the magnitude of the resultant moment of these forces about the midpoint.

Draw a diagram to show how a single pulley can be used so as to have its ideal M.A= 2.

The diagram below shows a lever in use:

1. To which class of levers does it belong?
2. Without changing the dimensions of the lever, if the load is shifted towards the fulcrum what happens to the mechanical advantage of the lever?

Draw a diagram of a block and tackle system of pulleys having a velocity ratio of 5. In your diagram indicate clearly the points of application and the directions of the load L and effort E. Also mark the tension T in each strand.

The pulley system has drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage.

Is the above pulley system an ideal machine or not?

The diagram below shows a claw hammer used to remove a nail : 

(i) To which class of lever does it belong ?
(ii) Give one more example of the same class of lever mentioned by you in (i) for which the mechanical advantage is greater than one.

The diagram below shows a pulley arrangement : 

(i) Copy the diagram and mark the direction of tension on each strand of the string.
(ii) What is the velocity ratio of the arrangement ?
(iii) If the tension acting on the string is T, then what is the relationship between T and effort E ?
(iv) If the free end of the string moves through distance x, find the distance by which the load is raised.

The following belong to which class of lever?

A pair of scissors

A block and tackle system of pulleys has a velocity ratio of 4.

1. Draw a labelled diagram of the system indicating clearly the points of application and directions of load and effort.
2. What is the value of the mechanical advantage of the given pulley system if it is an ideal pulley system?

Name a single pulley in which displacement of load and effort is not the same.

State one advantage of single movable pulley.

A metre scale of weight 50 gf can be balanced at 40 cm mark without any weight suspended on it.

1. If this ruler is cut at its centre then state which part [0 to 50 cm or 50 to 100 cm] of the ruler will weigh more than 25 gf.
   
2. What minimum weight placed on this metre ruler can balance this ruler when it is pivoted at its centre?

Name the class of the lever shown in the picture below:

What is the advantage of using a block and tackle system over a single movable pulley?

Why should she connect more number of pulleys in the upper fixed block?

Two identical marbles A and B are rolled down along Path 1 and Path 2 respectively.

Path 1 is frictionless and Path 2 is rough.

1. Which marble will surely reach the next peak?
2. Along which path/s the mechanical energy will be conserved?
3. Along which path/s is the law of conservation of energy obeyed?

Copy and complete the labelled diagram connecting the two pulleys with a tackle to obtain Velocity Ratio= 2.

If Load = 48 kgf and efficiency is 80% then calculate:

1. Mechanical Advantage.
2. Effort needed to lift the load.
   

The adjacent diagram shows the movable block of a block and tackle system with effort in a convenient direction. From the diagram we can conclude that the number of pulleys used in the fixed block are ______.