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.