intro
Question 1:
What does the first law of motion define?
Topic: Laws of Motion
Correct Answer: C) Force
- The first law of motion, also known as Newton's first law or the law of inertia, primarily explains the concept of force.
- In simple terms, it indicates that objects remain stationary or move uniformly in a straight line when not affected by external forces.
- Therefore, the first law of motion gives us a significant understanding of the concept of force, making option C the correct answer.
Question 2:
If a stone falls from the top of a tower and reaches the ground in 4 seconds, with gravity (g) equal to 10m/s2, how high is the tower?
Topic: Free Fall and Gravity
Correct Answer: C) 80 m
- A falling object's height can be calculated using the formula S = 1/2gt2, where S is the distance, g is gravity, and t is time.
- Substituting the given values, we get S = 1/2 * 10 * (42) which equals 80 m. Hence, the correct answer is C, "80 m".
Question 3:
A person stands in the middle of a block of smooth ice. Which of Newton's laws can he utilize to reach the shore?
Topic: Newton's Laws of Motion
Correct Answer: C) 3rd law of motion
- According to Newton's 3rd law of motion, every action has an equal and opposite reaction.
- So, in this scenario, the person can push the ice block in one direction to move in the opposite direction. Therefore, the correct answer is C, "3rd law of motion".
Question 4:
An object moving at a constant speed:
Topic: Basic Mechanics
Correct Answer: B) Might be accelerated
- An object moving at a constant speed can either be not accelerated or might be accelerated, depending on its trajectory.
- If the object is moving in a straight line, its acceleration is zero. However, if the object is moving along a circular path, its change in direction results in centripetal acceleration.
- Therefore, the correct answer is B, "Might be accelerated".
Question 5:
In which type of collision are both momentum and total energy conserved?
Topic: Momentum and Energy Conservation
Correct Answer: C) Both 'A' and 'B'
- Both momentum and total energy are conserved in elastic as well as in-elastic collisions.
- During elastic collisions, kinetic and momentum energy are conserved.
- In in-elastic collisions, while the total kinetic energy is not conserved, the total energy (including potential energy and internal kinetic energy) is conserved.
- Therefore, the correct answer is C, "Both 'A' and 'B'".
Question 6:
In the vast expanse of the universe, everything is in a state of:
Topic: Motion in Physics
Correct Answer: B) Perpetual motion
- In the cosmos, everything is constantly moving. This continuous movement is referred to as perpetual motion.
- While some objects may seem at rest from our perspective, they are actually moving in relation to other celestial bodies.
- Therefore, the correct answer is B, "Perpetual motion".
Question 7:
If a car is driven with a constant acceleration, what should the velocity-time graph look like?
Topic: Motion and Acceleration
Correct Answer: A) A straight line
- A constant acceleration results in a linear change in velocity; hence, the velocity-time graph is a straight line.
- The slope of this line represents the value of the constant acceleration.
- Therefore, the correct answer is A, "A straight line".
Question 8:
Think of a particle moving straight forward, as depicted in the given diagram. What is the distance covered by the particle in a duration of 4 seconds?
Topic: Kinematics
Correct Answer: C) 55 m
- The distance covered by the particle can be calculated by finding the area under the velocity-time graph.
- By dividing the graph into a rectangle and a triangle, we can sum up the areas (Rectangle = Base × Height, Triangle = 1/2 × Base × Height) to get the total distance.
- Therefore, the correct answer is C, "55 m".
Question 9:
What is the ratio of the distance traveled to the magnitude of displacement when an object completes a semicircular path?
Topic: Motion in Physics
Correct Answer: A) π/2
- When an object completes a semicircular path, the distance traveled is half the circumference of a circle (πR), while the displacement is the diameter of the circle (2R).
- Therefore, the ratio of distance traveled to the magnitude of displacement is πR/2R which simplifies to π/2.
- Thus, the correct answer is A, "π/2".
Question 10:
Which of the following is true about Newton's 2nd Law?
Topic: Newton's Laws of Motion
Correct Answer: B) It quantifies force
- Newton's 2nd Law is used to measure or quantify force, as it relates force (F), mass (m), and acceleration (a) in the equation F=ma.
- While Newton's 1st Law defines the concept of force, the 2nd Law provides a means to measure it.
- Therefore, the correct answer is B, "It quantifies force".
Question 11:
What is equivalent to the rate of change of momentum of an object over time?
Topic: Momentum and Force
Correct Answer: A) Force
- The rate of change of momentum of an object with respect to time is equal to the force applied on it, as per Newton's second law of motion.
- The equation F = ∆P/∆t illustrates this relationship.
- Hence, the correct answer is A, "Force".
Question 12:
How would you best describe a perpetual motion?
Topic: Motion in Physics
Correct Answer: C) Uninterrupted
- Perpetual motion refers to the continuous and unceasing movement of objects.
- Even though the term "perpetual" can give an impression of "eternal", in physics, it is more accurate to describe it as "uninterrupted".
- Therefore, the correct answer is C, "Uninterrupted".
Question 13:
A vehicle travels one-third of a certain distance at 20 km/hr and the remaining two-thirds at 60 km/hr. What is its average speed?
Topic: Speed, Distance and Time
Correct Answer: C) 36 km/hr
- In order to calculate average speed, you need to divide the journey's total distance by the total time taken.
- Here, the time taken to cover each part of the journey differs due to the different speeds, so we need to add up the time taken for each part to find the total time.
- Upon calculating, we find that the average speed comes out to be 36 km/hr. Hence, the correct answer is C, "36 km/hr".
Question 14:
What determines the horizontal distance covered by a projectile at a specific location?
Topic: Projectile Motion
Correct Answer: A) The projection angle and velocity
- The horizontal range of a projectile is influenced by both the angle and velocity at which it is launched.
- Neither the mass of the object nor the angle or velocity alone will determine the range.
- As a result, the correct response is A, "The projection angle and velocity".
Question 15:
What does a car's speedometer measure?
Topic: Speed and Velocity
Correct Answer: B) Instantaneous speed
- A vehicle's speedometer displays the instantaneous speed, which is the speed at a specific instant in time.
- It does not calculate the average or constant speed.
- As a result, the correct response is B, "Instantaneous speed".
Question 16:
When a package is thrown from a stationary boat towards the shore, the boat moves in the opposite direction. Which law explains this phenomenon?
Topic: Newton's Laws of Motion
Correct Answer: C) Newton's 3rd law of motion
- According to Newton's 3rd law of motion, every action has an equal and opposite reaction.
- Hence, when a package is thrown from the boat, the action force acts on the package towards the shore, and the reaction force acts on the boat in the opposite direction.
- Therefore, the correct answer is C, "Newton's 3rd law of motion".
Question 17:
In a scenario where a particle has been in motion for a certain duration, which of the following could possibly be zero?
Topic: Distance and Displacement
Correct Answer: C) The particle's displacement
- Distance is the total path covered by a particle and cannot be zero if the particle is in motion.
- Speed is the rate of change of distance and thus cannot be zero as well.
- Displacement, on the other hand, represents the shortest distance from the particle's initial position to its final position, and it could be zero if the particle returns to its starting point even after moving. Hence, the correct answer is C, "The particle's displacement".
Question 18:
As demonstrated in the figure, a body moves from an initial point ‘A’ to a final point ‘B’. Which route represents the body's displacement?
Topic: Displacement
Correct Answer: B) Route II
- Displacement refers to the shortest distance from an object's initial to final position.
- It is a vector quantity and does not depend on the actual path taken.
- Therefore, the shortest path between points A and B, represented by Route II, correctly signifies the body's displacement.
Question 19:
If a bullet reaches a maximum height of 11m when fired at an angle of 30o with the horizontal, what would be the maximum height when the bullet is fired at an angle of 60o?
Topic: Projectile Motion
Correct Answer: C) 33 m
- The maximum height reached by a projectile is influenced by the angle of projection.
- As the angle of projection increases, so does the height achieved.
- In this case, firing the bullet at a steeper angle (60o) increases the maximum height achieved, making the correct answer C, "33 m".
Question 20:
In the case of an elastic collision, which of the following is preserved?
Topic: Elastic Collision
Correct Answer: D) All of the above
- An elastic collision is a particular type of collision where momentum and kinetic energy are preserved.
- Total energy is also conserved, as it includes both kinetic and potential energy, and energy cannot be created or destroyed.
- Therefore, the correct answer is D, "All of the above".
Question 21:
Which of these statements about an object in equilibrium is incorrect?
Topic: Equilibrium
Correct Answer: A) The object must be stationary
- An object in equilibrium may be at rest or moving at a constant speed.
- It is not necessary for the object to be stationary, as even objects moving with a uniform velocity can be in equilibrium.
- Hence, the incorrect statement is A, "The object must be stationary".
Question 22:
In the same direction, a train travels at 25 mph, and a car follows it at 8 mph. In relation to the car, what is the train's relative velocity?
Topic: Relative Velocity
Correct Answer: A) 17 m/s
- A relative velocity is determined by the difference in velocities of two objects moving in the same direction.
- In this scenario, the train's velocity with respect to the car is the train's velocity minus the car's velocity (25m/s - 8m/s).
- Thus, the correct answer is A, "17 m/s".
Question 23:
An object is launched vertically upward with an initial velocity of 100m/s. After how long will it hit the ground?
Topic: Free Fall
Correct Answer: B) 20 s
- The time taken to fall back to the ground can be calculated using the formula t = (2Vi Sinθ)/g, where θ is the angle of launch. In this case, as the object is launched vertically upward, θ = 90° and sin90° = 1.
- Substituting the given values, we get t = (2 × 100)/10 = 20 s.
- Therefore, the correct answer is B, "20 s".
Question 24:
In the case of projectile motion,
Topic: Projectile Motion
Correct Answer: B) Both magnitude and direction of velocity change
- Gravitational pull and initial launch angle influence both magnitude and direction of velocity in projectile motion.
- Therefore, the correct answer is B, "Both the magnitude and direction of velocity change".
Question 25:
Consider F1 to be the force that the Earth exerts on the Sun, and F2 to be the force that the Sun exerts on the Earth. Which relationship is true?
Topic: Force and Motion
Correct Answer: B) F1 = F2
- According to Newton's third law, forces in an interaction are equal and opposite. This means F1 and F2 should be equal in magnitude.
- Therefore, the correct answer is B, "F1 = F2".
Question 26:
If a particle's kinetic energy is numerically the same as its momentum, what would be the speed of the particle?
Topic: Momentum & Kinetic Energy
Correct Answer: B) 2 m/s
- In the case of a particle with mass m and velocity v, its kinetic energy (KE = 1/2 mv²) would be numerically equal to its momentum (p = mv) if and only if v = 2 m/s.
- Therefore, the correct answer is B, "2 m/s".
Question 27:
What does the slope of a velocity-time graph represent?
Topic: Motion
Correct Answer: A) Acceleration
- In a velocity-time graph, the rate of change of velocity with respect to time is represented by the slope of the graph. This rate of change of velocity is defined as acceleration.
- Therefore, the correct answer is A, "Acceleration".
Question 28:
A circle is formed by an object moving at a constant speed, which statement about the object is correct?
Topic: Circular Motion
Correct Answer: D) The kinetic energy of the object remains constant.
- In circular motion with constant speed, the velocity changes because of its direction, but the speed (and therefore the kinetic energy) remains constant.
- Therefore, the correct answer is D, "The kinetic energy of the object remains constant".
Question 29:
How would the maximum height reached by a projectile change if its initial velocity is reduced by half, while the angle of projection remains the same?
Topic: Projectile Motion
Correct Answer: B) It would be quartered.
- The maximum height (H) reached by a projectile is given by the formula H = Vi²/(2g), where Vi is the initial velocity.
- If Vi is halved, the height decreases by a quarter.
- Therefore, the correct answer is B, "It would be quartered".
Question 30:
At which angle of projection would a projectile have the maximum horizontal range?
Topic: Projectile Motion
Correct Answer: B) 45°
- In projectile motion, the horizontal range is at its maximum when the angle of projection is 45°.
- This is because the sine function reaches its maximum at this angle, maximizing the range.
- Therefore, the correct answer is B, "45°".