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Motion definition: 1 Mark
If the position of the body is changing with time, with respect to an observer, then the body is said to be in motion.

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Periodic Motion + Examples: 1 Mark
Hands of clock: 1 Mark
If an object repeats its motion along a certain path, about a certain point, in a fixed interval of time, the motion of such an object is known as periodic motion. Examples of periodic motions are the motion of a pendulum, the motion of a spring, the vibration of a guitar string, the rotation of the Earth about its axis, the revolving of the Earth around the Sun, the revolving of the Sun around the centre of the Galaxy, etc.
The hands of the clock move in a circle about a fixed point. Hence, they definitely perform the circulatory motion. Since the hands of the clock are covering an equal distance in equal interval of times, we can call it a periodic motion.

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Sundial: 1 Mark
Working: 1 Mark
Sundials are the oldest known instruments for telling time. The surface of a sundial has markings for each hour of daylight. As the Sun moves across the sky, another part of the sundial casts a shadow on these markings. The position of the shadow shows what time it is.
Sundial works on the principle that the sun takes up similar positions each day. Depending on the location of the sun with respect to the dial, the dial would have different shadows by which people can approximately tell the time of the day.

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Formula: 1 Mark
Result: 1 Mark
Type of motion: 1 Mark
i) The time period of a pendulum is the amount of time it takes to complete 1 oscillation.
Therefore the time period for 12 oscillations in 20 seconds can be calculated as,
$Timeperiod=\frac{Totaltime}{No.ofoscillations}=\frac{20}{12}=1.67Seconds$

ii) A Pendulum undergoes periodic motion. Periodic motion is a type of motion, in which the object repeats its motion in regular intervals of time.

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Explanation: 1 Mark
Determination of speed: 1 Mark
The above statement implies that Vehicle A is covering a larger distance as compared to Vehicle B in the same time period.
To identify the faster vehicle, we can calculate the speed of both vehicles. The one with more speed will be faster.

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Definition: 1 Mark
Occurrence: 1 Mark
An odometer is a device that used to measure the distance covered by a vehicle.
Odometer along with speedometer is present in most of the vehicles.

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Calculation: 2 Marks
Result: 1 Mark
15 minutes $=\frac{15}{60}hours$ = 0.25 hrs

$Speed=\frac{distance}{time}$

Speed of Sohan $=\frac{1.2}{0.25}$ = 4.8 km/hr

Speed of Rohan = 4.5 km/hr

Hence, Sohan is faster than Rohan.

Answer: Option A. ->
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Uniform motion: 1.5 Marks
Non-Uniform motion: 1.5 Marks
A body is said to have a uniform motion if it travels equal distances in equal intervals of time, no matter how small or long these intervals may be. Example: A vehicle running at a constant speed of 10m/s, will cover equal distances of 10metres every second, so its motion will be uniform.

A body is said to have a non-uniform motion if it travels unequal distances in equal intervals of time, no matter how small these intervals may be.
Example:  A freely falling ball from a certain height covers unequal distances in equal intervals of time, so its motion is non-uniform.

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Yes/No: 1 Mark
Reason: 1 Mark
Examples: 1 Mark
No, all periodic motions are not oscillatory motions. Only those periodic motions in which the object is undergoing a to and fro motion is said to be oscillatory in nature.
On the other hand, all oscillatory motions are periodic motions.
 
Examples for Oscillatory Motion:
a. Oscillations of a simple pendulum.
b. Vibrations of a mass attached to a spring.
a)b)

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Oscillatory Motion: 1 Mark
Examples: 1 Mark
Justification: 1 Mark
If a body moves to and fro repeatedly about a mean position, it is called oscillatory motion.
Examples of Oscillatory Motion:
a. Oscillations of a simple pendulum.
b. Vibrations of a mass attached to a spring.
Yes, all oscillatory motions are periodic motions.It is periodic motion because it repeats after fixed interval of time.