PST JEST Science MCQs Explain Lever, Axle, Energy, Pulley, Inclined plane, Force and types with MCQs

Explain Lever, Axle, Energy, Pulley, Inclined plane, Force and types with MCQs | PST JEST Science MCQs

We have explained basic general science topics in a very simple way. These topics have been taken from Sindh Textbook board Jamshoro Class 5 and Class 6 General Science.
We have also solved the exercise of General Science, which includes fill in the blanks and MCQs.

Most important topics for PST JEST Sindh Education teaching jobs by IBA Sukkur.

NOTE:

Hm ny mcqs aur exams related sab pdf books upload krdye hn kindly check them in pdf books section.

Topics:

1. What is Lever? Types of a lever?
2. What is AXLE?
3. Mechanical Energy, Kinetic Energy & Potential Energy.
4. Pulley & its Types?
5. Inclined Plane?
6. Force and its Types?
Solved Exercise: Blanks & MCQs

Q: 01. What is LEVER?

A liver is a rigid rod that can move freely around a fixed point.

There are three parts of LEVER
1. Fulcrum: Fixed point around which lever moves.
2. Load: Object on which work is being done.
3. Effort: Force applied on the lever.

There are three classes of a lever based on the position of fulcrum, load and effort.

First-Class Lever :

In a first-class lever, the fulcrum is located between the load and the effort.
Example: Pair of Scissors

Second Class Lever :

In a second-class lever, the load is located between the fulcrum and effort.
Example: Wheelbarrow

Third Class Lever :

In a third-class lever, the effort is located between the load and fulcrum.
Example: Stapler

Q: 02. What is AXLE?

Ans: Rod between two wheels or a rod in the screwdriver is AXLE.

Q.03: What is Mechanical Energy and Types of Mechanical Energy?

Ans: The energy possessed by an object due to its position or its movement is called mechanical energy.

There are two types of Mechanical Energy
1. Potential Energy: Energy is due to the position of an object.
2. Kinetic Energy: Energy due to the movement of an object.

Q.04: Explain Pulley and its types?

Ans: A pulley is a wheel, with a rim so that a rope or chain can run around it. A pulley changes the direction of force applied. A pulley can be two types - Fixed pulley and movable pulley.

Q.05: What is an Inclined Plane?

Ans: An inclined plane is a slope. Less effort is needed to move an object up through an inclined plane as compared to lifting it straight.
Example: Ramp, Staircase, Slide.

Force and types of Forces

A push or pull applied on an object is called Force.

1. Gravitational Force of Gravity

The force that attracts objects to the centre of the Earth is called gravitational force or gravity.

2. Muscular Force:

When we push or pull something, we are applying muscular force.

3. Electrostatic Force:

Tear a paper into tiny pieces. Run a comb through dry hair. Now bring the comb closer to the tiny bits of paper. The bits of paper stick to the comb. This happens because of the electrostatic force.

4. Friction or Frictional Force:

The force that acts between two objects when they are in contact with each other is called friction.

Fixed Pulley: In a fixed Pulley, the axle is fixed to a support.
Example: Drawing water from a well

Movable Pulley: Movable Pulley is used in combination with a fixed Pulley. It is used to lift heavy loads.

Force: A push or pull applied on an object is called force.

Gravitational force: The force that attracts objects to the centre of the Earth is called the gravitational force.

Magnetic Force: The force of push or pull applied by a magnet on an iron object or another magnet is called magnetic force.

Mechanical energy: The energy possessed by an object due to its position or movement is called mechanical energy.

Energy: Energy is the ability to do work.

Simple tools that make our work easier and faster are called simple machines.

Revision:
A force can move a stationary object, stop a moving object, change the direction of a moving object or change the shape of an object.

Exercise:

Fill in the Blanks:

1. A _____ changes the direction of force applied.
Ans: Pulley

2. _____ is the object on which work is done.
Ans: Load

3. A plier and ______ are examples of first-class levers.
Ans: Crowbar

4. Mechanical energy is of ______ types.
Ans: Two ( potential/kinetic )

5. ______ energy helps us to see things.
Ans: Sound Energy

Solve the following MCQs

1. Which of the following is an example of a lever?
A. Knife              B. Screwdriver
C. Slide              D. See-saw √

2. Which of the following forces attracts objects to the centre of the Earth?
A. Gravity √     B. Friction
C. Magnet       D. Energy

3. Which kind of force is required to push a cart?
A. Electrostatic Force
B. Magnetic Force
C. Gravity
D. Muscular Force √

4. Which of the following is an example of a first-class lever?
A. Scissors √       B. Tongs
C. Pulley               D. Stapler

5. Name of the first spacecraft that landed on the moon
Ans: Apollo-11 landed on the moon on 21st Jul 1969.