Test: Work, Force, Energy And Simple Machines - 2 - Class 5 MCQ

# Test: Work, Force, Energy And Simple Machines - 2 - Class 5 MCQ

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## 15 Questions MCQ Test Science Class 5 - Test: Work, Force, Energy And Simple Machines - 2

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Test: Work, Force, Energy And Simple Machines - 2 - Question 1

### Regarding lever, select the correct statement from the given below (i) In beam balance, fulcrum is in the middle (ii) A nutcracker is an example of third class lever (iii) In tongs the, the fulcrum and the load are at two ends (iv) Sea-saw is an example of first class lever

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 1

The correct statement regarding the lever is:
(i) In beam balance, fulcrum is in the middle.
(iii) In tongs, the fulcrum and the load are at two ends.
(iv) Sea-saw is an example of first class lever.
Let's discuss each statement in detail:
(i) In beam balance, fulcrum is in the middle:
- A beam balance is a type of lever where the fulcrum is located in the middle.
- This allows for equal distribution of weight on both sides of the fulcrum, making it easier to compare the weights of two objects.
(iii) In tongs, the fulcrum and the load are at two ends:
- Tongs are a type of lever where the fulcrum is located at one end and the load (the object being lifted or held) is at the other end.
- The effort is applied in the middle to squeeze the tongs and hold the load.
(iv) Sea-saw is an example of first class lever:
- A sea-saw is a classic example of a first-class lever.
- The fulcrum is located in the middle, and the effort (the force applied) and the load (the weight being lifted) are on opposite sides of the fulcrum.
- When one person pushes down on their side, the other side goes up, creating a balancing motion.
Therefore, the correct statement is (i), (iii), and (iv).
Answer: A. (i), (iii), and (iv)
Test: Work, Force, Energy And Simple Machines - 2 - Question 2

### What are the two types of pulleys?

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 2
A pulley can be of two types: fixed pulley and movable pulley. Fixed pulleys are attached to a support, while movable pulleys are used in combination with fixed pulleys to lift heavy loads.
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Test: Work, Force, Energy And Simple Machines - 2 - Question 3

### What safety habit should you follow when using a knife?

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 3
When carrying sharp and pointed tools like a knife, position the pointed edge downward and handle it with care to avoid accidents.
Test: Work, Force, Energy And Simple Machines - 2 - Question 4
Which of the following is an example of muscular force?
Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 4
Muscular force is applied when we push or pull something using our muscles. A boy pushing a bicycle is an example of muscular force.
Test: Work, Force, Energy And Simple Machines - 2 - Question 5

What are the different simple machines used in the fishing rod?

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 5

A fishing rod uses both a wheel and axle (for the reel) and a lever (the rod itself).

Test: Work, Force, Energy And Simple Machines - 2 - Question 6

Which of the following form of energy is required to move the wheeled trolley?

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 6

The correct answer is A: Mechanical energy.
Explanation:
To move the wheeled trolley, mechanical energy is required. Mechanical energy is the energy possessed by an object due to its motion or position. In this case, the trolley needs to overcome forces such as friction and gravity to move.
Here is a detailed explanation of each option:
1. Mechanical energy: This is the energy associated with the motion or position of an object. In the case of the wheeled trolley, mechanical energy is required to overcome the forces acting against its motion and move it. It can be in the form of kinetic energy (energy of motion) or potential energy (energy due to position).
2. Electrical energy: Electrical energy is the energy associated with the flow of electric charge. While electrical energy may be used to power the motor of the trolley, it is not the primary form of energy required to move the trolley itself.
3. Solar energy: Solar energy is the energy derived from the sun. Although solar energy can be converted into other forms of energy, such as electrical energy, it is not directly used to move the wheeled trolley.
4. Heat energy: Heat energy is the energy associated with the random motion of particles. While heat energy may be generated during the movement of the trolley due to friction, it is not the energy required to initiate and sustain the motion of the trolley.
In conclusion, the primary form of energy required to move the wheeled trolley is mechanical energy.
Test: Work, Force, Energy And Simple Machines - 2 - Question 7

When a ball is thrown in the air upward it comes down after some time, because of

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 7
Explanation:
When a ball is thrown in the air upward, it comes down after some time due to the force of gravity. This force is responsible for the attractive interaction between all objects with mass. Here is a detailed explanation of why the ball comes down:
1. Law of Gravity:
- The ball experiences a force of gravity as soon as it is thrown upwards.
- According to Newton's Law of Universal Gravitation, every object in the universe attracts every other object with a force that is directly proportional to their masses and inversely proportional to the square of the distance between their centers.
- The force of gravity pulls the ball towards the center of the Earth.
2. Initial Velocity and Acceleration:
- When the ball is thrown upwards, it has an initial velocity in the upward direction.
- However, due to the force of gravity, the ball experiences a downward acceleration throughout its motion.
- This acceleration causes the ball to slow down until it reaches its highest point (maximum height).
3. Maximum Height:
- At the highest point of the ball's trajectory, its velocity becomes zero momentarily.
- The force of gravity continues to act on the ball, pulling it downwards.
4. Downward Motion:
- After reaching its maximum height, the ball starts to move downwards due to the continued influence of gravity.
- The downward acceleration increases the ball's velocity, causing it to fall faster.
5. Terminal Velocity:
- Eventually, the ball reaches a point where the force of gravity is balanced by the force of air resistance (friction).
- At this point, the ball reaches its terminal velocity - the maximum speed it can achieve while falling.
- The ball continues to fall at a constant speed until it reaches the ground.
Therefore, the ball comes down after being thrown upwards because of the force of gravity acting upon it.
Test: Work, Force, Energy And Simple Machines - 2 - Question 8
Which safety habit is important while using simple machines?
Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 8
Ensuring the moving parts of machines are well lubricated helps prevent accidents and ensures smooth operation. Additionally, sharp tools should be handled with care and stored properly.
Test: Work, Force, Energy And Simple Machines - 2 - Question 9

What is the unit of measurement of energy?

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 9
The unit of measurement of energy is the Joule.
Explanation:
The unit of measurement for energy is the Joule (J). Here's an explanation of why:
1. Energy:
- Energy is a scalar physical quantity that describes the ability or capacity of a system to do work or cause a change.
- It is a fundamental concept in physics and is used to measure various forms of energy, such as mechanical, thermal, electrical, and chemical energy.
2. Joule:
- The Joule is the SI unit of energy and is named after the English physicist James Prescott Joule.
- It is defined as the amount of work done when a force of one Newton is applied over a distance of one meter.
- Mathematically, 1 Joule is equal to 1 Newton-meter (N·m).
3. Other Units:
- While the Joule is the primary unit of energy, there are other units that are commonly used depending on the context or magnitude of the energy being measured.
- For example, the calorie (cal) is often used to measure energy in the field of nutrition and food science.
- Additionally, the kilowatt-hour (kWh) is commonly used to measure electrical energy consumption in households and businesses.
Conclusion:
The unit of measurement of energy is the Joule (J), which is defined as the amount of work done when a force of one Newton is applied over a distance of one meter. Other units, such as the calorie and kilowatt-hour, are also used in specific contexts.
Test: Work, Force, Energy And Simple Machines - 2 - Question 10

The lid of a jar is which kind of simple machine

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 10
The lid of a jar is a screw, which is a type of simple machine.
Explanation:
The lid of a jar is designed to be twisted on and off, which is made possible by the presence of threads on both the lid and the jar. This threading mechanism allows the lid to be securely fastened and sealed onto the jar, preventing the contents from spilling or spoiling.
Characteristics of a screw as a simple machine:
- A screw is an inclined plane wrapped around a cylinder or cone.
- It has a helical groove, known as threads, running along its length.
- The rotation of the screw converts linear force into rotational force.
- The pitch of the screw determines the mechanical advantage it provides.
Advantages of using a screw as a lid for a jar:
- The threading mechanism of a screw allows for a secure and airtight seal, preventing leakage or contamination of the contents.
- It is easy to open and close the jar by twisting the lid, providing convenience to the user.
- The mechanical advantage provided by the threads allows for a greater force to be applied while tightening or loosening the lid.
Overall, the lid of a jar can be classified as a screw, which is a type of simple machine. Its design and functionality make it an effective tool for sealing and preserving the contents of the jar.
Test: Work, Force, Energy And Simple Machines - 2 - Question 11

Which of the following activities involves the use of lever

(i) Using your arm to lift a hand bag
(ii) Using scissor to cut clothes
(iii) Using a wheel barrow to transfer tool

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 11
Explanation:
The lever is a simple machine that consists of a rigid bar that is free to rotate around a fixed point called the fulcrum. It is used to amplify or redirect force.
Let's analyze each activity to determine if it involves the use of a lever:
(i) Using your arm to lift a handbag:
- In this activity, your arm acts as a lever, with the elbow joint acting as the fulcrum.
- When you lift the handbag, the biceps muscle contracts, applying an upward force on the forearm, which acts as the effort force.
- The load force is the weight of the handbag acting downwards.
- The forearm acts as a lever, with the elbow joint as the fulcrum, to overcome the load force and lift the handbag.
(ii) Using scissors to cut clothes:
- Scissors consist of two blades joined together at a fulcrum.
- When you squeeze the handles of the scissors, the blades pivot around the fulcrum, creating a cutting motion.
- The effort force is applied by your fingers, and the load force is applied by the material being cut.
- The blades of the scissors act as levers, with the fulcrum at the pivot point, to cut through the material.
(iii) Using a wheelbarrow to transfer tools:
- A wheelbarrow consists of a long handle, a wheel, and a shallow container for carrying items.
- When you push the wheelbarrow, the handle acts as a lever, with the wheel as the fulcrum.
- The effort force is applied by your arms, and the load force is the weight of the tools and the wheelbarrow itself.
- The handle of the wheelbarrow acts as a lever, with the wheel as the fulcrum, to transfer the tools.
Therefore, all of the given activities involve the use of a lever. The correct answer is D: All of these.
Test: Work, Force, Energy And Simple Machines - 2 - Question 12

A sea-saw is an example of

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 12
Explanation:
Definition of a sea-saw:
A sea-saw is a long, narrow board that is balanced in the middle on a fulcrum. It has two seats on either end and is used as a play equipment in parks and playgrounds.
Analysis of the sea-saw:
To determine the type of lever the sea-saw represents, we need to analyze its structure and function.
Structure of the sea-saw:
- A long, narrow board
- Balanced in the middle on a fulcrum
- Two seats on either end
Function of the sea-saw:
- When one person pushes down on their seat, the other person on the opposite end goes up.
- The movement is dependent on the force applied and the position of the fulcrum.
Determining the type of lever:
Based on the analysis of the structure and function of the sea-saw, we can determine its type of lever.
First class lever:
- A first-class lever has the fulcrum situated between the effort and the load.
- In a first-class lever, the effort and the load move in opposite directions.
- The sea-saw does not fit the definition of a first-class lever as the fulcrum is not situated between the effort and the load.
Second class lever:
- A second-class lever has the load situated between the effort and the fulcrum.
- In a second-class lever, the effort and the load move in the same direction.
- The sea-saw fits the definition of a second-class lever as the load (person on the opposite end) is situated between the effort (person pushing down on their seat) and the fulcrum.
Third class lever:
- A third-class lever has the effort situated between the load and the fulcrum.
- In a third-class lever, the effort and the load move in the same direction.
- The sea-saw does not fit the definition of a third-class lever as the effort (person pushing down on their seat) is not situated between the load (person on the opposite end) and the fulcrum.
Conclusion:
Therefore, the sea-saw is an example of a second-class lever as the load (person on the opposite end) is situated between the effort (person pushing down on their seat) and the fulcrum.
Test: Work, Force, Energy And Simple Machines - 2 - Question 13
Which simple machine is used to decrease force to carry out delicate work?
Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 13
Class 3 levers have the effort located between the fulcrum and the load, and are used to decrease force to carry out delicate work, such as with tweezers and tongs.
Test: Work, Force, Energy And Simple Machines - 2 - Question 14
Which of the following is NOT a source of electrical energy?
Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 14
The sun is not a direct source of electrical energy, though it is a source of solar energy. Electrical appliances like fans, washing machines, and computers use electrical energy generated at power stations and supplied to our homes through wires.
Test: Work, Force, Energy And Simple Machines - 2 - Question 15

While loading of boxes on trucks ramp is used. The surface of the ramp is made smoother because, there would be less

Detailed Solution for Test: Work, Force, Energy And Simple Machines - 2 - Question 15
Explanation:
The surface of the ramp is made smoother because, there would be less friction opposing the box. Here's a detailed explanation:
Friction:
Friction is a force that opposes the motion of objects in contact with each other. When a box is being loaded onto a truck ramp, friction between the box and the ramp surface can make it difficult to push or slide the box. This friction force acts in the opposite direction of the applied force, making it harder to move the box.
Smooth Surface:
By making the surface of the ramp smoother, the amount of friction between the box and the ramp is reduced. A smooth surface allows the box to slide more easily, requiring less force to move it. This is because a smooth surface reduces the amount of roughness or irregularities that can cause the box to stick or catch on the ramp.
Less Friction:
With less friction opposing the box, it becomes easier to push or slide the box onto the truck ramp. This is beneficial when loading multiple boxes onto the truck, as it reduces the effort required and increases efficiency.
Conclusion:
So, the surface of the ramp is made smoother to reduce the friction opposing the box, making it easier to load the boxes onto the truck ramp.

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