## 1. Which of the following describes the motion of an object in a straight line?

### Answer:

### Explanation:

Translational motion refers to the movement of an object in a straight line without any rotation.

## 2. If an object moves with a constant velocity, what can be said about its acceleration?

### Answer:

### Explanation:

Constant velocity implies no change in speed or direction, which means the object has zero acceleration.

## 3. The slope of a position-time graph represents?

### Answer:

### Explanation:

The slope of a position-time (or displacement-time) graph gives the velocity of the object.

## 4. An object is said to be in uniform motion if:

### Answer:

### Explanation:

Uniform motion is defined by the consistent coverage of distance over regular time intervals.

## 5. If the velocity-time graph of an object is a horizontal line parallel to the time axis, then the object is:

### Answer:

### Explanation:

A horizontal line on a velocity-time graph indicates that the velocity is constant over time.

## 6. Which quantity remains unchanged during uniformly accelerated motion in a straight line?

### Answer:

### Explanation:

In uniformly accelerated motion, the velocity changes due to acceleration. However, the speed might remain constant if the object changes direction but maintains its magnitude of velocity.

## 7. A car travels 60 km in the first hour, 50 km in the second hour, and 40 km in the third hour. Its average speed is:

### Answer:

### Explanation:

Average speed = (Total distance) / (Total time) = (60 + 50 + 40) km / 3 hr = 150 km / 3 hr = 50 km/hr

## 8. What is the nature of the distance-time graph for a body in uniform motion?

### Answer:

### Explanation:

A body in uniform motion will have a constant slope in its distance-time graph, representing a straight line inclined to the time axis.

## 9. An object is moving in a straight line and its velocity is continuously decreasing. Its acceleration is:

### Answer:

### Explanation:

Decreasing velocity indicates negative acceleration.

## 10. If the displacement of an object is proportional to the square of time, then the object is moving with:

### Answer:

### Explanation:

If displacement is proportional to the square of time, it indicates non-uniform acceleration.

## 11. A car moves with a speed of 30 m/s for 10 minutes. The total distance covered by the car is:

### Answer:

### Explanation:

Distance = speed × time = 30 m/s × 600 s = 18000 m = 18 km.

## 12. If a body is thrown vertically upwards, its velocity at the highest point is:

### Answer:

### Explanation:

At the highest point, the body momentarily comes to rest before starting its descent, making its velocity zero.

## 13. A body moving in a straight line has a negative acceleration and positive velocity. The body is:

### Answer:

### Explanation:

A positive velocity indicates forward movement, and a negative acceleration indicates it is slowing down.

## 14. The slope of the distance-time graph represents:

### Answer:

### Explanation:

The slope of the distance-time graph gives the speed or velocity of the moving object.