The comprehensive approach in SCERT Class 10 Physics Solutions Chapter 7 Mechanical Advantage in Action Important Questions with Answers ensure conceptual clarity.
SSLC Physics Chapter 7 Important Questions Kerala Syllabus
Mechanical Advantage in Action Class 10 Important Questions
Question 1.
If the toothed wheel attached to the axle is connected to the wheel attached to the engine as in the given figure, the speed of the vehicle …………………………….. .
(increases/deceases/ does not change)
Answer:
speed decreases
Question 2.
Which of the following have mechanical advantage equal to one.
a) Fixed pulley
b) Lemon squeezer
c) Common balance
d) forceps
Answer:
a) Fixed pulley and
c) Common balance
Question 3.
Some statements are given.
i) Mechanical advantage of first order lever is equal to one or greater than one or lesser than one.
ii) Mechanical advantage of second order lever is always less than one.
iii) Mechanical advantage of third order lever is always less than one.
iv) Mechanical advantage of third order lever is always greater than one.
Choose the correct option,
a) i & ii
b) i & iv
c) i & iii
d) none of these
Answer:
c) i & iii
Question 4.
If the toothed wheel attached to the axle is connected to the wheel attached to the engine as in the given figure, the efficiency of the vehicle to rotate ……………………………. .
(increases/deceases/does not change)
Answer:
increases
Question 5.
What is an example of a first-order lever in the human body?
Answer:
The neck is an example, where the skull (load) pivots on the atlas vertebra (fulcrum), and neck muscles (effort) control head movement.
Question 6.
Select the odd one.
(Scissors, Nut cracker, Common balance, seesaw)
Answer:
Nut cracker
Question 7.
Find the relation between the first word pair and complete the second pair.
Lemon Squeezer : Second order lever
Fishing pole : ……………………
Answer:
Third order lever
Question 8.
Give an example of a second-order lever used in everyday life?
Answer:
A nutcracker is a second-order lever, where the fulcrum is at one end, the load is in the middle, and the effort is applied at the handles.
Question 9.
What is an example of a third-order lever in the human body?
Answer:
The elbow joint is a third-order lever, where the fulcrum is the elbow, the effort is applied by the biceps muscle, and the load is in the hand or forearm.
Question 10.
Statement: The mechanical advantage of a second-order lever is always greater than one.
Reason: The effort arm and the load arm are equal. Which of the following is correct?
a) Both the statement and the reason are correct.
b) The statement is correct, but the reason does not justify the statement.
c) Both the statement and the reason are incorrect.
d) The statement is incorrect, but the reason is correct.
Answer:
b) The statement is correct, but the reason does not justify the statement.
Question 11.
What is the difference between a wedge and a screw?
Answer:
Both are simple machines. A wedge is a double inclined plane with a sharp edge . A screw can be considered as an inclined plane wrapped around a cylinder.
Question 12.
Why do second-order levers always have a mechanical advantage greater than 1?
Answer:
Because the effort arm (distance from fulcrum to effort) is always longer than the load arm (distance
from fulcrum to load), less effort is needed to lift the load, resulting in a mechanical advantage greater than 1.
Question 13.
A force of 30 N was applied on a nail puller to pull a nail. If the mechanical advantage of the nail puller was two, what would be the load applied by the nail?
Answer:
Mechanical advantage = Load /Effort
Mechanical advantage = 2
Effort = 30 N
Load = ?
Load = Mechanical advantage Effort
= 2 × 30 N
= 60 N
Question 14.
Say whether the following statements are true or false. Correct them if wrong.
a) If the effort comes in between the load and the fulcrum, it is a second order lever.
b) There is no gain in work by using simple machine.
Answer:
a) False
If the effort comes in between the load and the fulcrum, it is a third order lever.
b) True
Question 15.
What is a third-order lever, and how does it differ from other levers?
Answer:
In a third-order lever, the effort is applied between the fulcrum and the load. The load arm is longer than the effort arm, resulting in a mechanical advantage less than 1, meaning more effort is required.
Example: A pair of tweezers, fishing rod
Question 16.
What is a second-order lever, and how does it work?
Answer:
In a second-order lever, the load is located between the fulcrum and the effort. The effort arm is always longer than the load arm, providing a mechanical advantage greater than 1, making it easier to lift heavy loads.
Example: Wheelbarrow, nut cracker, lemon squeezer
Question 17.
Classify the following into those with a mechanical advantage greater than 1 and those less than 1: Nutcracker, fishing rod, lemon squeezer, bottle opener, wheelbarrow, forceps, tongs.
Answer:
| Mechanical advantage greater than 1 | Mechanical advantage less than 1 |
| Nutcracker lemon squeezer bottle opener wheelbarrow |
fishing rod forceps tongs |
Question 18.
Figure shows a lever.
a) Identify the type of lever shown in figure above? Give an another example for the same type of lever.
b) Explain about the type of lever identified.
c) How does it work?
Answer:
a) First-order lever
Example: Scissors
b) First-order lever has the fulcrum positioned between the effort and the load.
c) It works by pivoting around the fulcrum, allowing the effort to move the load. The mechanical advantage depends on the relative distances from the fulcrum to the effort and load.
Question 19.
How does the position of the fulcrum affect a lever’s function?
Answer:
The fulcrum’s position determines the lever’s mechanical advantage and function. In first-order levers, moving the fulcrum closer to the load increases mechanical advantage. In second-order levers, the fulcrum at one end maximizes force. In third-order levers, the fulcrum’s position enhances speed and range of motion at the cost of force.
Question 20.
What are the differences between first, second, and third order levers?
Answer:
First order lever: In a first order lever, fulcrum comes in between effort and load. The load can be equal to, lesser or greater than the effort. The mechanical advantage of a first order lever is equal to one or greater than one or lesser than one.
Second order lever: In a second order lever, the load is always more than the effort. The load comes in between effort and fulcrum. Mechanical advantage of a second order lever is always more than one.
Third order lever: In a third order lever, the load is always less than the effort. The effort comes in between fulcrum and load. Its mechanical advantage is always less than one.
Question 21.
Classify the following levers into first, second, and third order lever.
Nut cracker, Fishing pole, Scissors, Wheel barrow, Lemon Squeezer, Seesaw, Forceps, Common balance, Fixed pulley. Elbow, Ice tongs
Answer:
First order lever
- Scissors
- Common balance
- Fixed pulley
Second order lever
- Nut cracker
- Wheelbarrow
- Lemon Squeezer
Third order lever
- Fishing pole
- Forceps
- Elbow
- Ice tongs
Question 22.
Simple machines are basic mechanical devices that mechanical devices that make work easier.
a) What do you mean by simple machines?
b) There are mainly six types of simple machines. Which are they?
c) What is mechanical advantage (MA)?
d) Mechanical advantage of a wheel and axle system is ……………………………..
Answer:
a) Simple machines are devices that change the magnitude of the effect of force or the direction of the force or both. They are devices that make exertion easier.
b) Lever, Pulley, Wheel and axle, Inclined plane, Screw, Wedge
c) Mechanical advantage (MA) is the ratio of the load to the effort. It is a number indicating how many times of the load is the effort. Mechanical advantage is only a ratio. It has no unit.
Mechanical advantage, MA = \(\frac{\text { Load }}{\text { Effort }}\)
d) \(\frac{R(\text { Radius of wheel })}{r(\text { Radius of axle })}\)