science
Grade-9
Easy
Question
A car is moving at a speed of 20 m/s towards east. In which of the following cases its velocity is said to be changed?
- Its speed becomes 25 m/s
- Its speed becomes 18 m/s
- Its turns towards north
- All of the above
Hint:
All of the above
The correct answer is: All of the above
The velocity of the car changes when the speed of the car changes along with the direction of the car, as it is a vector quantity.
Related Questions to study
science
A person runs around a square park of side 10 m, 4 times. What is the distance and displacement covered by the person ?
A person runs around a square park of side 10 m, 4 times. What is the distance and displacement covered by the person ?
scienceGrade-9
science
The driver of a car moving at a velocity of 50 m/s applies brakes and eventually stops after 10 s. What is the acceleration of the car?
The driver of a car moving at a velocity of 50 m/s applies brakes and eventually stops after 10 s. What is the acceleration of the car?
scienceGrade-9
science
An object is moving in a non-uniform motion. Which of the following physical quantities gives the measure of the rate of motion?
An object is moving in a non-uniform motion. Which of the following physical quantities gives the measure of the rate of motion?
scienceGrade-9
science
Which of the following remains constant in a uniform circular motion?
Which of the following remains constant in a uniform circular motion?
scienceGrade-9
science
Which of the following is constant during a uniform circular motion?
Which of the following is constant during a uniform circular motion?
scienceGrade-9
science
The velocity of a body changes when ___.
The velocity of a body changes when ___.
scienceGrade-9
science
A car moves at a speed of 3 m/s. What is its acceleration?
A car moves at a speed of 3 m/s. What is its acceleration?
scienceGrade-9
science
In which of the following cases a body is said to be accelerating ?
Negative acceleration is known as deceleration.
In which of the following cases a body is said to be accelerating ?
scienceGrade-9
Negative acceleration is known as deceleration.
science
The distance of an object ___ be zero but/and its displacement ____ be zero.
The distance of an object ___ be zero but/and its displacement ____ be zero.
scienceGrade-9
science
Displacement is the ____ distance between two points.
Displacement is the ____ distance between two points.
scienceGrade-9
science
Uniform circular motion is a/an ___ motion.
Uniform circular motion is a/an ___ motion.
scienceGrade-9
science
In a uniformly accelerated motion, which of the following changes?
In a uniformly accelerated motion, which of the following changes?
scienceGrade-9
science
In a uniform motion, which of the following remains constant?
In a uniform motion, which of the following remains constant?
scienceGrade-9
science
The SI unit of measurement of velocity and acceleration are ____ and ____ respectively.
The SI unit of measurement of velocity and acceleration are ____ and ____ respectively.
scienceGrade-9
science
The velocity-time graph drawn by Mona turned out to be a straight line parallel to the x-axis. Which of the following is true about the body’s motion?
a. The body did not make any displacement
b. The body’s velocity was constant
c. The body made a non-zero displacement
d. The body is at rest
The velocity-time graph drawn by Mona turned out to be a straight line parallel to the x-axis. Which of the following is true about the body’s motion?
a. The body did not make any displacement
b. The body’s velocity was constant
c. The body made a non-zero displacement
d. The body is at rest
scienceGrade-9
