Answer: Option A. ->
:
Definition: 1 Mark
Working: 2 Marks
A speedometer is a device that measures the speed of a particular vehicle at that particular instant.
The speedometer calculates the speed of the vehicle at a particular instant by measuring the time it takes for the wheels of the vehicle to rotate. Since the distance moved in each rotation is constant, knowing the time it takes for one rotation gives us the speed.

Answer: Option A. ->
:
Correct answer: 1.5 Marks
Justification: 1.5 Marks
If you are sitting inside a car that is moving, then you are in a state of rest with respect to the car but in a state of motion with respect to the surroundings outside the car.
When a person is sitting inside a car, the person's position with respect to the car is not changing but his position with respect to surroundings outside the car is changing.

Answer: Option A. ->
:

Distance Covered: 2 Marks
Average Speed: 2 Marks
Steps: 1 Mark
John drove the first 30 minutes at 30 km/hr and then changed his speed to 60 km/hr for the next 30 mins. Hence, total distance traveled by John will be the distance he covers in the entire 1 hour.
Time = 0.5 hr

Speed = 30 km/hr

Distance covered $=speed\times time=30\times 0.5=15km$

Now, new speed = 60 km/hr

Time = 0.5 hr

Distance covered $=speed\times time=60\times 0.5=30km$

Total distance covered by him = 15 + 30 = 45 km in one hour.
$Averagespeed=\frac{Totaldistancetravelled}{Totaltime}$
Average speed $=\left(\frac{45}{1}\right)\frac{km}{hr}$
Average speed = 45 km/hr

Answer: Option A. ->
:

Distance covered by car: 1 Mark
Speed in km/min = 1 Mark
Speed in km/hr = 1 Mark
Steps: 1 Mark
Formula: 1 Mark
Initial reading = 350 km

Final reading = 500 km

Distance covered = 500 - 350 = 150 km

Time taken = 30 minutes

$\text{Speed}=\frac{\text{distance}}{\text{time}}=\frac{150}{30}=5$ km/min

Speed in km/hr = $5\times 60=300$ km/hr

Answer: Option A. ->
:

Each option: 1 Mark each
1) Straight line

2) Oscillatory motion

3) Oscillatory motion

4) Straight line

5) Circular motion