Physics
Grade-9
Easy
Question
Which type of motion is represented by the plastic ruler shown below?

- Circular
- Translatory
- Rotatory
- Vibratory
Hint:
When a body moves to and fro about its mean position is called vibratory motion.
The correct answer is: Vibratory
The plastic ruler as shown in the figure moves up and down at regular intervals of time. Hence, it is said to be in vibratory motion.
Related Questions to study
Physics
Read the following statements and choose the correct option:
Assertion: All oscillatory motions are necessarily periodic motions, but all periodic motions are not oscillatory.
Reason: Simple pendulum is an example of oscillatory motion.
- The assertion is wrong, but the reason is right.
- The assertion and the reason are right, and the reason is the correct explanation of the assertion.
- The assertion and the reason both are wrong.
- Both assertion and reason are right, but the reason is not the correct explanation of the assertion.
Read the following statements and choose the correct option:
Assertion: All oscillatory motions are necessarily periodic motions, but all periodic motions are not oscillatory.
Reason: Simple pendulum is an example of oscillatory motion.
PhysicsGrade-9
- The assertion is wrong, but the reason is right.
- The assertion and the reason are right, and the reason is the correct explanation of the assertion.
- The assertion and the reason both are wrong.
- Both assertion and reason are right, but the reason is not the correct explanation of the assertion.
Physics
Select the one that is an example of periodic motion:
- A car taking a turn on a curved road.
- March past of soldiers.
- A bird flying in the air.
- A lift moving down.
Select the one that is an example of periodic motion:
PhysicsGrade-9
- A car taking a turn on a curved road.
- March past of soldiers.
- A bird flying in the air.
- A lift moving down.
Physics
Which of the following is incorrectly matched?
- Simple pendulum – periodic motion.
- Strings of a guitar – rectilinear motion.
- Blades of a food processor – circular motion.
- Falling of a stone – rectilinear motion.
Which of the following is incorrectly matched?
PhysicsGrade-9
- Simple pendulum – periodic motion.
- Strings of a guitar – rectilinear motion.
- Blades of a food processor – circular motion.
- Falling of a stone – rectilinear motion.
Physics
The period of a periodic motion is the ________ interval of time after which the motion is __________.
- Average, repeated
- Mean, not repeated
- Largest, repeated
- Smallest, repeated
The period of a periodic motion is the ________ interval of time after which the motion is __________.
PhysicsGrade-9
- Average, repeated
- Mean, not repeated
- Largest, repeated
- Smallest, repeated
Physics
Human lungs expand and contract during breathing. The movement of the lungs during breathing is an example of:
- Uniform motion
- Circular motion
- Periodic motion
- Non-uniform motion
Human lungs expand and contract during breathing. The movement of the lungs during breathing is an example of:
PhysicsGrade-9
- Uniform motion
- Circular motion
- Periodic motion
- Non-uniform motion
Physics
Which letter among the following represents the mean position of the pendulum?

- A
- B
- O
- All the above
Which letter among the following represents the mean position of the pendulum?

PhysicsGrade-9
- A
- B
- O
- All the above
Physics
When ____A_____ of a ____B_____ starting from its mean position O, moves from one extreme (maximum or minimum) to another (minimum or maximum) and back, it is called a/an _____C______. What are A, B and C respectively?
- String, oscillation, vibration
- Bob, pendulum, oscillation
- Bob, pendulum, speed
- String, pendulum, time period
When ____A_____ of a ____B_____ starting from its mean position O, moves from one extreme (maximum or minimum) to another (minimum or maximum) and back, it is called a/an _____C______. What are A, B and C respectively?
PhysicsGrade-9
- String, oscillation, vibration
- Bob, pendulum, oscillation
- Bob, pendulum, speed
- String, pendulum, time period
Physics
The motion that repeats itself at regular intervals of time is:
- Non-uniform motion
- Circular motion
- Periodic motion
- Rectilinear motion
The motion that repeats itself at regular intervals of time is:
PhysicsGrade-9
- Non-uniform motion
- Circular motion
- Periodic motion
- Rectilinear motion
Physics
Motion in a straight line is called:
- Rectilinear motion
- Periodic motion
- Rotational motion
- Circular motion
Motion in a straight line is called:
PhysicsGrade-9
- Rectilinear motion
- Periodic motion
- Rotational motion
- Circular motion
Physics
Which of the following is not a correct example of periodic motion?
- Throwing a stone from one place to another.
- The earth rotation about its axis.
- The hands of a clock.
- The motion of a pendulum.
Which of the following is not a correct example of periodic motion?
PhysicsGrade-9
- Throwing a stone from one place to another.
- The earth rotation about its axis.
- The hands of a clock.
- The motion of a pendulum.
Physics
Which one of the following types of motion is possessed by the needle of a sewing machine?
- Circular motion
- Rotational motion
- Periodic motion
- Both rectilinear and rotational motion
Which one of the following types of motion is possessed by the needle of a sewing machine?
PhysicsGrade-9
- Circular motion
- Rotational motion
- Periodic motion
- Both rectilinear and rotational motion
Physics
Rotational motion is not possessed by which one of the following examples?
- Elevator
- Potter's wheel
- Turning of merry-go-round
- The spinning of a tub in a washing machine
Rotational motion is not possessed by which one of the following examples?
PhysicsGrade-9
- Elevator
- Potter's wheel
- Turning of merry-go-round
- The spinning of a tub in a washing machine
Physics
In which of the following types of motion an object moves such that distance from a fixed point remains the same?
- Translatory motion
- Rectilinear motion
- Circular motion
- Curvilinear motion
In which of the following types of motion an object moves such that distance from a fixed point remains the same?
PhysicsGrade-9
- Translatory motion
- Rectilinear motion
- Circular motion
- Curvilinear motion
Physics
Which of the following is NOT exhibited by a rotating fan?
- Circular motion
- Rotatory motion
- Periodic motion
- Rectilinear motion
Which of the following is NOT exhibited by a rotating fan?
PhysicsGrade-9
- Circular motion
- Rotatory motion
- Periodic motion
- Rectilinear motion
Physics
A motion in which a body moves about a fixed axis without changing its position is called:
- Rotatory motion
- Translatory motion
- Oscillatory motion
- Periodic motion
A motion in which a body moves about a fixed axis without changing its position is called:
PhysicsGrade-9
- Rotatory motion
- Translatory motion
- Oscillatory motion
- Periodic motion