Class 9 | Physics
- What is the SI unit of speed?
A. Meters per second (m/s)
B. Kilometers per hour (km/h)
C. Centimeters per second (cm/s)
D. Miles per hour (mph) - Which of the following is an example of circular motion?
A. A car moving in a straight line
B. A spinning top
C. A book falling from a shelf
D. A ball rolling down a hill - If an object moves in a straight line and covers equal distances in equal intervals of time, its motion is said to be:
A. Uniform
B. Accelerated
C. Random
D. Irregular - What does the slope of a distance-time graph represent?
A. Speed
B. Acceleration
C. Displacement
D. Time - Which of the following is NOT a vector quantity?
A. Mass
B. Velocity
C. Force
D. Acceleration - If an object is in uniform motion, what can be said about its acceleration?
A. It is zero
B. It is constant
C. It is changing
D. It is negative - What is the acceleration due to gravity on the surface of the Earth?
A. 9.8 m/s²
B. 6.67 × 10⁻¹¹ m³/kg·s²
C. 3.14 m/s²
D. 2.5 m/s² - When an object is in free fall, what is the value of its acceleration?
A. Zero
B. 9.8 m/s²
C. 1 m/s²
D. 2.5 m/s² - Which of Newton’s laws states that an object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force?
A. Newton’s First Law of Motion
B. Newton’s Second Law of Motion
C. Newton’s Third Law of Motion
D. Newton’s Law of Universal Gravitation - If you double the force applied to an object of constant mass, what happens to its acceleration?
A. It is halved
B. It is doubled
C. It remains the same
D. It is quadrupled - Which of the following quantities has both magnitude and direction?
A. Speed
B. Distance
C. Time
D. Velocity - The tendency of an object to resist a change in its state of motion is known as:
A. Inertia
B. Gravity
C. Momentum
D. Velocity - What is the unit of work in the SI system?
A. Joules (J)
B. Newtons (N)
C. Watts (W)
D. Hertz (Hz) - Which of the following statements is true regarding kinetic energy?
A. It depends on an object’s mass but not its speed.
B. It is a scalar quantity.
C. It is directly proportional to an object’s speed.
D. It is measured in joules (J). - Which of the following is a measure of an object’s resistance to changes in its rotational motion?
A. Torque
B. Inertia
C. Angular velocity
D. Momentum - If an object is moving with a constant speed in a circular path, what can be said about its acceleration?
A. It is zero
B. It is directed radially inward
C. It is directed tangentially
D. It is directed outward - Which law of motion explains the action of a rocket in space?
A. Newton’s First Law of Motion
B. Newton’s Second Law of Motion
C. Newton’s Third Law of Motion
D. Kepler’s Third Law of Planetary Motion - In a collision between two objects, the total momentum before the collision is:
A. Always greater than the total momentum after the collision
B. Always less than the total momentum after the collision
C. Always equal to the total momentum after the collision
D. Not related to the total momentum after the collision - Which of the following statements is true about projectile motion?
A. The horizontal component of velocity remains constant.
B. The vertical component of velocity remains constant.
C. The acceleration is always directed vertically downward.
D. The range is independent of the initial velocity. - What is the formula for calculating average speed?
A. Average Speed = Distance / Time
B. Average Speed = Time / Distance
C. Average Speed = Force / Mass
D. Average Speed = Velocity x Time