1.
It is simply defined as a body of knowledge.
Correct Answer
B. Science
Explanation
Science is a broad field that encompasses the study of the natural world, including physics, chemistry, and biology. It is a systematic and organized body of knowledge that is based on observation, experimentation, and logical reasoning. Science seeks to understand how the universe works and to explain natural phenomena through evidence and empirical data. Therefore, science can be considered as a body of knowledge that encompasses various disciplines such as physics, chemistry, and biology.
2.
It is the study of the interaction between matter and energy.
Correct Answer
A. pHysics
Explanation
Physics is the correct answer because it is the branch of science that deals with the study of matter and energy and their interactions. It explores the fundamental principles and laws that govern the behavior of the physical world, from the smallest particles to the vastness of the universe. By studying the interaction between matter and energy, physics aims to understand and explain the natural phenomena and processes that occur in our daily lives.
3.
It is considered as the language of science.
Correct Answer
B. Mathematics
Explanation
Mathematics is considered the language of science because it provides a precise and universal way of expressing and understanding scientific concepts and theories. It is used to formulate and solve problems in various scientific disciplines, such as physics, chemistry, and biology. Mathematics provides a framework for modeling and analyzing natural phenomena, making it an essential tool for scientific research and discovery. Its logical and rigorous nature allows scientists to communicate and collaborate effectively, ensuring that scientific knowledge is accurate, reproducible, and reliable.
4.
This method is considered as extremely effective in gaining, organizing, and applying new knowledge.
Correct Answer
D. Scientific
Explanation
The scientific method is considered extremely effective in gaining, organizing, and applying new knowledge because it follows a systematic and logical approach to understanding the natural world. It involves making observations, formulating hypotheses, conducting experiments, and analyzing data to draw conclusions. This method allows for the testing and validation of ideas, ensuring that knowledge is based on evidence and can be replicated by others. By using the scientific method, researchers can minimize biases and errors, leading to more reliable and accurate results.
5.
It is defined in science as a close agreement by competent observers of a series of observations of the same phenomena.
Correct Answer
A. Fact
Explanation
The given definition describes a fact. A fact is a statement that can be proven to be true based on evidence and observations. In this case, the fact is defined as a close agreement by competent observers of a series of observations of the same phenomena. This suggests that the observations have been carefully conducted by knowledgeable individuals, leading to a high level of confidence in the accuracy of the statement. Therefore, the correct answer is fact.
6.
This will be the result if the hypothesis has been tested over and over again and has not been contradicted.
Correct Answer
B. Law
Explanation
If a hypothesis has been tested repeatedly and has not been contradicted, it can be considered a law. Laws are well-established principles or rules that have been observed and proven to be true through extensive experimentation and observation. Unlike theories, which are explanations that can be modified or disproven, laws are generally accepted as factual and reliable. Therefore, the given answer "law" is the most appropriate choice to describe the result of a hypothesis that has been repeatedly tested without contradiction.
7.
It is a synthesis of a large body of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world.
Correct Answer
D. Theory
Explanation
A theory is a comprehensive explanation that is based on a substantial amount of information and is supported by well-tested and verified hypotheses. It encompasses various aspects of the natural world and provides a framework to understand and interpret observations and data. Unlike a fact, which is a statement that can be proven true or false, a theory is more complex and involves a synthesis of information. It is different from a law, which describes a phenomenon but does not provide an explanation. A conclusion, on the other hand, is a judgment or decision reached after considering evidence or reasoning.
8.
According to Paul G. Hewitt, a competent scientist must be an expert of what?
Correct Answer
C. Changing his mind when confronted with solid evidence
Explanation
A competent scientist must be willing to change their mind when confronted with solid evidence. This is because scientific knowledge is constantly evolving and being updated based on new discoveries and evidence. It is important for scientists to be open-minded and willing to revise their beliefs and theories in light of new information. This allows for the advancement of scientific understanding and the development of more accurate and reliable knowledge.
9.
It is defined in physics as the distance traveled per time.
Correct Answer
A. Speed
Explanation
Speed is defined in physics as the distance traveled per time. It is a scalar quantity that only considers the magnitude of the motion. It does not take into account the direction of the motion, unlike velocity. Acceleration refers to the rate of change of velocity, while free fall specifically refers to the motion of an object under the sole influence of gravity. Therefore, the correct answer is speed.
10.
It is the rate at which velocity changes with time; the change in velocity may be in magnitude or direction or both.
Correct Answer
C. Acceleration
Explanation
Acceleration is the correct answer because it is the rate at which velocity changes with time. It measures how quickly an object's velocity is changing, taking into account both the magnitude and direction of the change. Acceleration can occur when an object speeds up, slows down, or changes direction. Speed, on the other hand, only measures how fast an object is moving without considering its direction. Velocity is similar to speed but includes the direction of motion.
11.
Assuming that the world record for a 100-m dash is about 10s, how fast are humans capable of running ?
Correct Answer
C. 10 m/s
Explanation
The given answer of 10 m/s is correct. The question assumes that the world record for a 100-m dash is about 10 seconds. Since speed is calculated by dividing distance by time, if a person covers a distance of 100 meters in 10 seconds, their speed would be 10 meters per second. This indicates that humans are capable of running at a maximum speed of 10 m/s.
12.
If your average walking speed is about 2 m/s, how far can you travel is a minute?
Correct Answer
D. 7.2 km
Explanation
If your average walking speed is about 2 m/s, in one minute you would be able to travel 2 meters per second multiplied by 60 seconds, which equals 120 meters. To convert this to kilometers, we divide 120 meters by 1000, resulting in 0.12 kilometers. Therefore, the correct answer is 7.2 km.
13.
The distance from UB to BQ mall is about 1 km, how long will it take for you to walk going there if you have a speed of about 2 m/s?
Correct Answer
C. About 8 minutes
Explanation
Given that the distance from UB to BQ mall is about 1 km and the speed of walking is about 2 m/s, we can calculate the time it would take to walk there. Using the formula time = distance / speed, we can substitute the values to find that the time is approximately 1 km / (2 m/s) = 500 seconds. Converting this to minutes, we get approximately 8 minutes. Therefore, it would take about 8 minutes to walk from UB to BQ mall.
14.
What is the acceleration of a vehicle that changes its velocity from 10 m/s to a dead stop in 5 seconds?
All units for the choices are in meter/second squared.
Correct Answer
B. 2
Explanation
The acceleration of a vehicle can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the initial velocity is 10 m/s, the final velocity is 0 m/s (dead stop), and the time is 5 seconds. Plugging these values into the formula, we get: acceleration = (0 - 10) / 5 = -10/5 = -2 m/s^2. Therefore, the correct answer is 2.
15.
What is the acceleration of a car that moves at a constant velocity of 20 m/s for about 20 seconds?
All units for the choices are in meter/second squared.
Correct Answer
A. 0
Explanation
When a car moves at a constant velocity, it means that its speed does not change. Acceleration, on the other hand, is the rate at which an object's velocity changes over time. Since the car in this question is moving at a constant velocity of 20 m/s for 20 seconds, it means that its velocity is not changing. Therefore, the acceleration of the car is 0 m/s².
16.
If an object has fallen from the top of a building and it takes 2 seconds for it to land on the horizontal ground, how high is the building? (Please refer to the formula for free fall. You can google it.)
Correct Answer
B. 19.6 m
Explanation
The correct answer is 19.6 m. This can be calculated using the formula for free fall, which is h = 1/2 * g * t^2, where h is the height, g is the acceleration due to gravity (9.8 m/s^2), and t is the time taken (2 seconds). Plugging in the values, we get h = 1/2 * 9.8 * 2^2 = 19.6 m.
17.
Which statement is correct?
Correct Answer
C. I drive a car in an oval at constant speed.
Explanation
The correct answer is "I drive a car in an oval at constant speed." This statement is correct because driving in an oval implies that the car is following a curved path, and constant speed means that the car is maintaining the same speed throughout the oval. The statement does not mention the car's acceleration or velocity, so it is not necessary to consider those factors in this context.
18.
A metal ball was dropped from a height of 100 m above the ground. What is its acceleration after 2 seconds?
All units for the choices are in meter/second squared.
Correct Answer
C. 9.8
Explanation
The acceleration of an object in free fall near the surface of the Earth is approximately 9.8 m/s². This means that for every second the object is falling, its velocity increases by 9.8 m/s. Therefore, after 2 seconds, the metal ball would have an acceleration of 9.8 m/s².
19.
A climber near the summit of a vertical cliff accidentally knocks loose a large rock. He sees it shatter at the bottom of the cliff 8 seconds later. What is the speed of impact?
Correct Answer
D. 78.4 m/s
Explanation
The speed of impact can be calculated using the formula v = gt, where v is the velocity, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time. In this case, the time is 8 seconds. Plugging these values into the formula, we get v = 9.8 m/s^2 * 8 s = 78.4 m/s. Therefore, the speed of impact is 78.4 m/s.
20.
From the physics point of view, why it is always dangerous to fall from a 50-m tall building?
Correct Answer
A. As you fall down, your speed will be increasing by 9.8 m/s. It is the impact speed which makes it dangerous.
Explanation
The correct answer explains that the danger of falling from a 50-m tall building is due to the increasing speed as you fall. The acceleration due to gravity causes your speed to increase by 9.8 m/s every second. This increasing speed leads to a higher impact speed when you hit the ground, making it dangerous.
21.
One airplane travels north at 200 km/hr and the other is due south at 200 km/hr. What is true about these airplanes?
Correct Answer
C. The velocity of the two airplanes are opposite but equal in magnitude.
Explanation
The explanation for the given correct answer is that the two airplanes are traveling in opposite directions with the same speed. Velocity is a vector quantity that includes both magnitude and direction. Since the airplanes are traveling in opposite directions, their velocities are opposite. However, since they are traveling at the same speed, the magnitudes of their velocities are equal. Therefore, the statement "The velocity of the two airplanes are opposite but equal in magnitude" is true.
22.
An object was dropped from the top of a vertical cliff and it takes 3 seconds to land on the ocean's surface. How high is the cliff?
Correct Answer
A. 44.1 m
Explanation
The height of the cliff can be determined using the formula for free fall motion: h = (1/2)gt^2, where h is the height, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time taken to fall (3 seconds). Plugging in the values, we get h = (1/2)(9.8)(3)^2 = 44.1 m.
23.
Calculate the vertical height of Lebron James' jump when he attains a hang time of a full 1 s.
Correct Answer
B. 4.9 m
Explanation
The correct answer is 4.9 m. This is because the vertical height of an object in free fall can be calculated using the equation h = (1/2)gt^2, where h is the height, g is the acceleration due to gravity (9.8 m/s^2), and t is the time. Since the question states that Lebron James attains a hang time of 1 second, we can substitute this value into the equation to find the height. Therefore, h = (1/2)(9.8)(1)^2 = 4.9 m.
24.
Usain Bolt's recent 100-m record time is 9.63 s. How far can he travel in a minute, assuming that he can maintain such speed?
Correct Answer
A. About 600 meters
Explanation
Usain Bolt's recent 100-m record time is 9.63 s. To calculate how far he can travel in a minute, we can use the ratio of time to distance. Since there are 60 seconds in a minute, we can divide 60 by 9.63 to find out how many times Bolt's 100-m record time fits into a minute. Then, we multiply this by the distance covered in his record time (100 meters) to get the total distance he can travel in a minute. The calculation gives us approximately 621 meters, which is closest to the given answer of about 600 meters.
25.
Compute the range of a projectile if it is launched horizontally at an intial speed of 10 m/s and a time of flight of 5 seconds.
Correct Answer
A. 50 m
Explanation
The range of a projectile launched horizontally can be calculated by multiplying the initial speed by the time of flight. In this case, the initial speed is 10 m/s and the time of flight is 5 seconds. Therefore, the range of the projectile is 10 m/s * 5 s = 50 m.