ICSE Worksheet for chapter-5 Machines class 10

Worksheet For class 10

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Summary

1. Machines, Function and uses of simple machine, Terms related with a machine and relationship between them
2. Levers, Kinds of lever with examples, Inclined plane and gears, working and application of gear system
3. Pulley, Single fixed pulley, Single movable pulley, Combination of pulleys, Effect of weight of pulleys

Section 1 - Objective

Q1. The mechanical advantage of a machine is 5. Find the effort necessary to lift 100 N.

1. 0.05 N
2. 20 N
3. 50 N
4. 100 N

Q2. To calculate the mechanical advantage, divide the resistance force by the

1. Friction
2. Ideal mechanical advantages
3. Work
4. Effort force

Q3. A baseball bat would be an example of a:

1. First order lever
2. Second order lever
3. Third order lever
4. Inclined plane

Q4. A sloping surface used to raise object is called an

1. Inclined plane
2. Wedge
3. Screw
4. Wheel and axle

Q5. A system of levers with a velocity ratio 25 overcomes a resistance of 3300N when an effort of 165N is applied. Find then the mechanical advantage.

1. 20
2. 40
3. 60
4. NOT

Q6. A cook uses a “fire tong” of length 35cm to lift a piece of burning coal of mass 200gm. If he applies his effort at a distance of 7cm from the fulcrum, then the efforts in S.I units is:

1. 10N
2. 20N
3. 40N
4. 60N

Q7. A uniform plane of sea saw is 8m long and is supported in the centre. A boy weighing 50Kgf sits at a distance of 2.5m from the fulcrum. Where must another boy weighing 40 Kgf sit, so as to balance the plank?

1. 2m
2. 4m
3. 3.125m
4. 4.75m

Q8. A beam balance is an example of:

1. Inclined plane
2. Lever of first order
3. Lever of second order
4. Lever of third order

Q9. A force applied to a machine to do mechanical work is called

1. Effort
2. Load
3. Efficiency
4. Output

Q10. A simple machine whose MA is always greater than 1 is

1. Inclined plane
2. Levers
3. Pulley
4. Ideal machine

Q11. A _ _ _ _ _ system is a device to transfer the rotator motion from one point to the other

1. Pulley
2. Lever
3. Gear
4. Inclined plane

Q12. Unit of gear ratio is

1. m
2. Sec
3. Km
4. Unit less

Q13. The MA of an ideal single movable pulley is

1. 1
2. 2
3. < 2
4. < 1

Q14. A single movable pulley is used as:

1. Force multiplier
2. Speed multiplier
3. Device to change the direction of effort
4. All of the above

Q15. A single string system has 5 pulleys. If an effort of 50 Kgf is required to raise a load of 150 Kgf, then find the efficiency of the system.

1. 60%
2. 80%
3. 10%
4. NOT

Section 2 - Objective

Q1. Define simple Machine and state its function.

Q2. Define: 1. Velocity ratio 2. Mechanical Advantage3. Efficiency 4. Ideal Machine 5. Lever

Q3. State the relationship between mechanical advantage, velocity ratio and efficiency.

Q4. Draw the labeled sketch of class I, class II and class III. levers Give the two examples of each kind of lever.

Q5. A two gear system has one wheel with 50 teeth and another wheel with 10 teeth. Find the gain in speed and gain in torque which can be obtained by their combination?

Q6. Distinguish between single fixed pulley and single movable pulley.

Q7. With reference to the term mechanical advantage, velocity ratio, and efficiency of a machine, names the term that will not change for a machine of a given design? Define the term stated by you.

Q8. A pulley system has a velocity ratio of 4 and efficiency of 90%. Calculate:

1. Mechanical Advantage
2. The effort required to raise a load of 300N by the system.

Solutions

Objective Problems

1. 2
2. 4
3. 3
4. 1
5. 1
6. 1
7. 3
8. 2
9. 1
10. 1
11. 3
12. 4
13. 2
14. 1
15. 1

Subjective Problems

Ans 5. Gain in speed = 10 & Gain in torque = 10

Ans 7. Velocity ratio

Ans 8. 1. MA = 3.6

2. 83.3 N