Objective Type Questions on Simple Machines Class 6 Concise Physics ICSE Solutions Ch-4. In this article you would learn how to solve Objective Type Questions on Simple Machines . Visit official Website  CISCE  for detail information about ICSE Board Class-6.

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Objective Type Questions on Simple Machines Class 6 Concise Physics ICSE Solutions

Board	ICSE
Publications	Selina Publication
Subject	Physics
Class	6th
Chapter-4	Simple Machines
Book Name	Concise
Topics	Solution of Objective Type Questions
Academic Session	2025-2026

                                       Objective Type Questions on Simple Machines

Que-1: For an ideal machine, the efficiency is :
(i)greater than unity
(ii)less than unity
(iii)equal to unity
(iv)depends on the value of load

Ans-equal to unity
Reason — For an ideal machine, the work output is equal to the work input, i.e., the efficiency of an ideal machine is 1 or equal to unity.

Que-2: Mechanical advantage of a machine is defined as :
(i) Load x Effort
(ii) Load/Effort
(iii) Load + Effort
(iv) Effort/Load

Ans- Load/Effort
Reason — The factor by which a machine multiplies the force applied (i.e. effort) is called the mechanical advantage of that machine and it is the ratio of the load to the effort. In other words,
Mechanical Advantage = Load/Effort

Que-3: The mechanical advantage of a lever is equal to :
(i) Load Arm/Effort Arm
(ii) Effort Arm/Load Arm
​(iii) Load Arm + Effort Arm
(iv) Load Arm – Effort Arm

​Ans- Effort Arm/Load Arm
​Reason — According to the principle of a lever the mechanical advantage of a lever is equal to the ratio of the effort arm to the load arm and is given by :
Mechanical Advantage = Load/Effort = Effort Arm/Load Arm

Que-4: A pulley is used because it :
(i) has the mechanical advantage greater than one
(ii) has 100% efficiency
(iii) helps to apply the force in a convenient direction
(iv) requires more effort to raise a less load

Ans- helps to apply the force in a convenient direction
Reason — A pulley is a simple machine by which the direction of effort is changed to raise up a load.

Que-5: Wheel is used with axle because :
(i) sliding friction is less than the rolling friction
(ii) rolling friction is less than the sliding friction
(iii) they work as the inclined plane
(iv) they help us to change the direction of force

Ans-rolling friction is less than the sliding friction
Reason — When a wheel rotates on its axle, the contact surfaces roll instead of slide. Rolling friction is much smaller than sliding friction, so using a wheel-and-axle arrangement greatly reduces the resistive force and makes it easier to move loads.

Fill in the blanks :

(i) The useful work done by an actual machine is always … …… .. than the work done on the machine.

Ans-  The useful work done by an actual machine is always less than the work done on the machine.

(ii) In class II levers, the … ….. … is in between fulcrum and …. …. … .

Ans- In class II levers, the load is in between fulcrum and effort .

(iii) The mechanical advantage of class … …. …. lever is always less than 1.

Ans- The mechanical advantage of class III lever is always less than 1.

(iv) A pulley is used to change … …. …. .

Ans-  A pulley is used to change the direction of effort.

(v) Mechanical advantage of an inclined plane is always … … ….. .

Ans- Mechanical advantage of an inclined plane is always greater than 1.

State whether the following statements are true or false: 

Que-1: A boy does work while pushing a wall.

Ans- False because work is said to be done if the force applied on the body moves it. If no motion or change in position takes place, no work is said to be done so when a boy pushes a wall, no work is done by him since wall remains stationary.

Que-2: A machine performs work by itself.

Ans- False because a machine can do useful work only when energy is supplied to it; it cannot work by itself.

Que-3: In an ideal machine, work done on load is equal to the work done by effort.

Ans- True because a machine in which no part of the work done on the machine is wasted, is called an ideal or perfect machine. Thus, for an ideal machine, the work done on load is equal to the work done by effort.

Que-4: All levers are force multipliers.

Ans-  False as Class I and Class II levers can act as force multipliers when the effort arm is longer than the load arm, but Class III levers have the effort applied closer to the fulcrum and thus do not multiply force.

Que-5: A pulley changes the direction of force.

Ans- True because a pulley is a simple machine by which the direction of effort is changed to raise up a load.

Que-6:  An inclined plane always has the mechanical advantage more than 1.

Ans- True because the effort required to push a load up an inclined plane is less than the load. Thus, the mechanical advantage of an inclined plane is always greater than 1.

 

Match the following columns :

Column A		Column B
(a)	Needle	(i)	class II lever
(b)	Door knob	(ii)	inclined plane
(c)	Ramp	(iii)	class I lever
(d)	Lemon crusher	(iv)	wheel and axle
(e)	See-saw	(v)	wedge

Ans- (a)-(v)
(b)-(iv)
(c)-(ii)
(d)-(i)
(e)-(iii)

— : End of Objective Type Questions on Simple Machines Class 6 Concise Physics ICSE Solutions :–

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