Every question from this NCERT chapter, with a detailed explanation.
With reference to non-uniform acceleration, consider the following statements: 1. It occurs when velocity changes by unequal amounts in equal intervals of time. 2. A car increasing its speed by equal amounts in equal intervals of time is an example of non-uniform acceleration. 3. Free fall of a body is an example of non-uniform acceleration. Which of the statements given above is/are correct?
Consider the following statements regarding the speed of sound and light: 1. Light travels faster than sound. 2. Thunder is heard before lightning is seen. 3. The speed of sound in air is approximately 346 km/s. Which of the statements given above is/are correct?
In a hammer throw event, the hammer moves along a straight line tangential to the circular path upon release. This is because:
With reference to the description of motion, consider the following statements: 1. The position of an object is described by specifying a reference point known as the origin. 2. An object's state of motion is absolute and independent of the observer. 3. Motion is inferred through the change in position of an object over time. Which of the statements given above are correct?
Consider the following statements regarding 'distance' and 'displacement': 1. Distance is a vector quantity requiring both magnitude and direction. 2. Displacement is the shortest distance measured from the initial to the final position of an object. 3. The magnitude of displacement is equal to distance when motion is in a straight line. Which of the statements given above is/are correct?
Under which condition is the displacement of a moving object zero, despite the distance travelled being non-zero?
With reference to physical quantities in motion, consider the following statements: 1. The numerical value of a physical quantity is referred to as its magnitude. 2. Displacement is described solely by its numerical value. 3. Distance can be zero for a moving object if it returns to the starting point. Which of the statements given above are correct?
In an automobile, the device known as an 'odometer' is used to measure:
Consider the following statements regarding the magnitude of displacement: 1. It can never be greater than the distance travelled. 2. It is always equal to the distance travelled regardless of the path. 3. It represents the shortest straight-line path between initial and final positions. Which of the statements given above is/are correct?
An object is said to be in 'uniform motion' along a straight line if:
Consider the following examples: 1. A car moving on a crowded street is an example of uniform motion. 2. A person jogging in a park. 3. A train slowing down before a station. Which of the above are examples of non-uniform motion?
With reference to the rate of motion, consider the following statements: 1. All objects take the same amount of time to cover a given distance. 2. The rate of motion is measured by finding the distance travelled per unit time. 3. The speed of an object must always be constant. Which of the statements given above is/are correct?
Consider the following statements regarding 'Average Speed': 1. It is calculated as the arithmetic mean of initial and final speeds for uniformly accelerated motion. 2. It is obtained by multiplying the total distance travelled by the total time taken. 3. It is used to describe the rate of motion for objects in non-uniform motion. Which of the statements given above are correct?
What is the fundamental difference between the quantities 'speed' and 'velocity'?
The magnitude of average velocity is equal to the average speed of an object only when:
In kinematics, 'acceleration' is defined as:
Consider the following statements about acceleration: 1. It is a measure of the distance covered per unit time. 2. If an object is in uniform motion, its acceleration is zero. 3. Acceleration can be in the direction of motion or against it. Which of the statements given above are correct?
In the context of linear motion, acceleration is considered negative (retardation) when:
Consider the following statements regarding the motion of a freely falling body: 1. It is an example of non-uniform motion. 2. It is an example of non-uniformly accelerated motion. 3. The acceleration of the body remains constant throughout the fall. Which of the statements given above is/are correct?
Consider a car applying brakes. Which of the following quantities would have a negative value? 1. Distance travelled ($s$). 2. Acceleration ($a$). 3. Change in velocity ($v - u$). Select the correct answer using the code given below:
Motion along a circular path at constant speed is classified as 'accelerated motion' because:
If an athlete runs along a regular octagonal track, how many times does the direction of motion change in a single complete lap?
If a stone undergoing uniform circular motion is suddenly released, what is the direction of its subsequent trajectory?
Which of the following are examples of uniform circular motion? 1. Motion of a car on a straight road. 2. A cyclist on a circular track at constant speed. 3. A train moving on a straight track. Select the correct answer using the code given below:
With reference to the motion of an object along a closed track, consider the following statements: 1. As the number of sides of a polygon track increases, the shape approaches a circle. 2. An athlete running on a rectangular track must change direction six times in one round. 3. In a circular track, the direction of motion changes at every point. Which of the statements given above are correct?
With reference to the concept of 'origin' in motion, consider the following statements: 1. It is a physical object that must always be stationary. 2. The choice of origin is arbitrary and can be changed for convenience. 3. Position is specified with respect to the origin. Which of the statements given above is/are correct?
For an object moving with uniform velocity, which of the following statements is correct?
The orbital motion of the Moon around the Earth is an example of accelerated motion primarily because:
In a velocity-time graph, non-uniform acceleration is represented by:
Consider the following statements: 1. Motion is always relative to an observer. 2. An object cannot be at rest and in motion simultaneously for different observers. 3. The earth's motion is inferred rather than perceived directly. Which of the statements given above are correct?
Consider the following statements regarding the path of an object: 1. In uniform motion, the path must always be circular. 2. In uniform circular motion, the path is a circle. 3. Displacement is independent of the path taken. Which of the statements given above are correct?
The phenomenon where roadside trees appear to move backward to a passenger in a moving bus is an example of:
With reference to the term 'uniform velocity', consider the following statements: 1. It implies zero acceleration. 2. It implies the object covers unequal displacements in equal intervals of time. 3. It is not possible in a circular path. Which of the statements given above is/are correct?
What is the net displacement of a satellite after it completes one full revolution in its orbit?