1.
The graph represents that the object is
Correct Answer
B. At constant velocity
Explanation
The graph represents that the object is at constant velocity. This is indicated by a straight horizontal line on the graph, which means that the object is not changing its position over time. It is neither speeding up nor slowing down, but maintaining a consistent speed.
2.
Study the graph. Point C to D shows that the car is
Correct Answer
A. Not moving or resting
Explanation
Based on the graph, the line connecting points C and D is a flat horizontal line, indicating that there is no change in the position of the car over time. This suggests that the car is not moving or resting during this time interval.
3.
What is happening to the object from Time 5 to 10?
Correct Answer
A. The object stopped and not moving.
Explanation
From Time 5 to 10, the object is not moving and has come to a stop. There is no indication of any change in speed, direction, or movement, suggesting that the object has halted completely.
4.
Magnitude shows only the number and the unit. If 10 is the number, and kilometer is the unit what is the magnitude?
Correct Answer
B. 10 kilometers
Explanation
The magnitude refers to the numerical value and unit of measurement. In this case, the magnitude is 10 kilometers because it specifies both the number (10) and the unit (kilometers).
5.
Scalar quantity shows only magnitude (number and unit) and Vector quantity shows both magnitude and direction. Which of the following are vector quantities?
Correct Answer
D. Displacement and Velocity
Explanation
Displacement and Velocity are vector quantities because they have both magnitude (number and unit) and direction. Displacement refers to the change in position of an object and includes information about both the distance and direction of the object's movement. Velocity, on the other hand, is the rate at which an object changes its position and includes both the speed (magnitude) and the direction of the object's motion. Distance and Speed are scalar quantities as they only have magnitude and do not include information about direction.
6.
The measurement of the point in the ruler the student is pointing on is
Correct Answer
A. 1.5 centimeters
Explanation
The correct answer is 1.5 centimeters because the student is pointing to a mark on the ruler that is halfway between the 1 centimeter mark and the 2 centimeter mark. Since there are 10 millimeters in a centimeter, the halfway point would be 5 millimeters, which is equal to 0.5 centimeters. Therefore, the measurement of the point the student is pointing on the ruler is 1.5 centimeters.
7.
Which unit would be best to measure the length of a car?
Correct Answer
B. Feet
Explanation
Feet would be the best unit to measure the length of a car because it is a commonly used unit for measuring small distances, such as the length of a car. Inches would be too small of a unit, kilometers would be too large of a unit, and yards would not be as commonly used for measuring the length of a car.
8.
Which is the best estimate of the mass of an elephant?
Correct Answer
D. 1000 kilograms
Explanation
The best estimate of the mass of an elephant is 1000 kilograms. Elephants are large mammals and typically weigh several tons. Kilograms are a more appropriate unit for measuring the mass of such a large animal, as grams would be too small of a unit.
9.
The bottle in the picture is about 7 ________________.
Correct Answer
A. Inches tall
Explanation
Based on the given options, the most appropriate unit to measure the height of the bottle in the picture is inches. The word "about" suggests that the measurement is approximate, and inches is commonly used to measure small objects like bottles. Therefore, the correct answer is "inches tall."
10.
What is the volume of the liquid inside the graduated cylinder?
Correct Answer
C. 37 milliliters
Explanation
The correct answer is 37 milliliters because it is the only option that falls within the range of the given measurements. Since the question asks for the volume of the liquid inside the graduated cylinder, we can conclude that the correct answer is the one that matches the given information.
11.
What are the laboratory safety devices the girl is wearing?
Correct Answer
A. Apron and Goggles
Explanation
The girl is wearing an apron and goggles as laboratory safety devices. An apron is worn to protect the body from spills and splashes of chemicals, while goggles are worn to protect the eyes from any potential hazards or projectiles in the lab. These safety devices are essential in maintaining a safe and protected environment while conducting experiments in the laboratory.
12.
What is the mass of the object measured by the triple beam balance?
Correct Answer
B. 336.8 grams
Explanation
The mass of the object measured by the triple beam balance is 336.8 grams.
13.
What is the name of the laboratory instrument in the picture?
Correct Answer
C. Beaker
Explanation
The correct answer is Beaker. A beaker is a common laboratory instrument used for holding, mixing, and heating liquids. It has a cylindrical shape with a flat bottom and a pouring spout. Beakers are made of glass or plastic and come in various sizes. They are often used in chemistry experiments and are easily recognizable due to their distinctive shape.
14.
Which of the following words best describe the picture?
Correct Answer
A. Observation
Explanation
Observation is the best word to describe the picture because it refers to the act of closely examining or watching something. In the context of the picture, it suggests that the viewer is carefully looking at the image and taking note of the details or information it presents. Hypothesis, data, and conclusion are not suitable descriptions for a picture as they relate more to the process of scientific inquiry or analysis.
15.
Hypothesis is a
Correct Answer
A. Guess
Explanation
A hypothesis is a guess or a tentative explanation that is made based on limited evidence or prior knowledge. It is a starting point for further investigation or research. While a hypothesis may be informed by data, it is not synonymous with data itself. Therefore, the correct answer is "guess."
16.
What is the last step of the scientific method?
Correct Answer
D. Draw a conclusion
Explanation
The last step of the scientific method is to draw a conclusion. After making observations, writing a hypothesis, and gathering data, scientists analyze the data and draw conclusions based on the results. Drawing a conclusion involves interpreting the data and determining whether the hypothesis was supported or not. This step is crucial in the scientific method as it allows scientists to communicate their findings and contribute to the existing body of knowledge in their field.
17.
Amanda runs 4 miles north, then turns around and runs 6 miles west. What is the total distance she run?
Correct Answer
A. 10 miles
Explanation
Amanda runs 4 miles north and then turns around and runs 6 miles west. The total distance she runs is the sum of the distances she runs in each direction. Therefore, the total distance is 4 miles north + 6 miles west, which equals 10 miles.
18.
Thelma walks 3 miles north from her door to the park, then returns home to her door. what is the displacement?
Correct Answer
D. 0 mile
Explanation
The displacement is 0 miles because displacement refers to the overall change in position from the starting point to the ending point. In this case, Thelma starts and ends at her door, so her overall change in position is 0 miles.
19.
The picture shows the X-axis and the Y-axis. Which of the following is true?
Correct Answer
A. X- Axis is horizontal and Y-axis is vertical
Explanation
The X-axis is horizontal and the Y-axis is vertical because that is the conventional orientation of these axes in a Cartesian coordinate system. The X-axis represents the horizontal direction, while the Y-axis represents the vertical direction.
20.
Norma swam 7 complete laps in a 50 meter pool. At the end, what is the displacement?
Correct Answer
C. 50 meters
Explanation
Since Norma swam 7 complete laps in a 50 meter pool, her total distance covered is 7 laps multiplied by 50 meters per lap, which equals 350 meters. Displacement refers to the straight-line distance between the initial and final positions. In this case, since Norma started and ended at the same position, her displacement is 0 meters. Therefore, the correct answer is 0 meters.
21.
Alex walks east for 3 km, stops for a break, and then runs the same direction for 4 km before he stops. The displacement is
Correct Answer
B. 7 km east
Explanation
Alex walks east for 3 km, then runs east for 4 km. Displacement is a vector quantity that represents the change in position from the starting point to the ending point. In this case, since Alex walks and runs in the same direction, the displacement is the sum of the distances traveled, which is 3 km + 4 km = 7 km east.
22.
To solve for C you can use the Pythagorean theorem which is equal to
Correct Answer
B. The square root of the square of A plus the square of B
Explanation
The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse (C) is equal to the sum of the squares of the other two sides (A and B). Therefore, to solve for C, we need to find the square root of the sum of the squares of A and B.
23.
The bus traveled 500 km east and 300 km south. What is the distance and the displacement?
Correct Answer
A. 800 km and 583 km SE
Explanation
The distance traveled by the bus is the sum of the distances traveled in each direction, which is 500 km + 300 km = 800 km. The displacement is the straight-line distance from the starting point to the ending point, which can be found using the Pythagorean theorem. The displacement is the square root of (500 km)^2 + (300 km)^2 = 583 km. The direction of the displacement is southeast (SE). Therefore, the correct answer is 800 km and 583 km SE.
24.
Jerico runs 5 laps around a 400 meter track. Why is displacement equal to 0?
Correct Answer
A. Because the end point is the same as the starting point.
Explanation
The displacement is equal to 0 because the end point of Jerico's run is the same as the starting point. Displacement refers to the change in position from the initial point to the final point, and since Jerico ends up at the same point where he started, there is no change in position. Therefore, the displacement is 0.
25.
Julie spins around 3 times without moving any direction. What is the distance and the displacement.
Correct Answer
B. 0 because she is just in one position.
Explanation
The distance is 0 because Julie spins around without moving any direction, so she does not cover any distance. The displacement is also 0 because displacement refers to the change in position from the starting point to the ending point, and since Julie remains in the same position after spinning, there is no displacement.
26.
David walked for 5 km north and 4 km east. What is the displacement?
Correct Answer
B. 6,4 km NE
Explanation
The displacement is the straight-line distance between the starting point and the ending point, regardless of the path taken. In this case, David walked 5 km north and 4 km east, which can be represented as a right-angled triangle with sides of 5 km and 4 km. Using the Pythagorean theorem, the displacement can be calculated as the square root of (5^2 + 4^2), which equals 6.4 km. The direction of the displacement is northeast (NE).
27.
The car runs 5 miles in 0.25 hour. The __________is 20 miles/h.
Correct Answer
A. Speed
Explanation
The question states that the car runs 5 miles in 0.25 hour. To find the speed, we divide the distance traveled by the time taken. In this case, 5 miles divided by 0.25 hour equals 20 miles per hour. Therefore, the correct answer is speed.
28.
The formula for for time is
Correct Answer
A. Distance divided by speed
Explanation
The correct answer is "distance divided by speed". This formula represents the concept of time as the ratio of the distance traveled to the speed at which it was traveled. By dividing the distance by the speed, we can determine the amount of time it takes to cover that distance. This formula is commonly used in physics and other fields to calculate time in relation to distance and speed.
29.
The car run 200 km north and 350 km east 5 hours.The velocity of the car is _______.
Correct Answer
A. 110 km/h northeast
Explanation
The velocity of the car is 110 km/h northeast because it traveled 200 km north and 350 km east in 5 hours. To find the velocity, we divide the total distance traveled (550 km) by the total time taken (5 hours), giving us a speed of 110 km/h. The direction is northeast because the car traveled more east than north, but it still had a significant northward component in its motion.
30.
Miguel flies the plane directly west for 20 miles, then turns to the south and flies another 30 miles in 0.5 hours. What is the velocity of the plane?
Correct Answer
A. 72 miles/h SW
Explanation
Miguel flies 20 miles directly west and then turns to the south and flies 30 miles. The total distance covered is 50 miles. The time taken is 0.5 hours. Velocity is defined as the rate of change of displacement with respect to time. Since Miguel is flying directly west and then south, the displacement is the diagonal distance between the starting point and the ending point, which is 50 miles southwest. Dividing the displacement by the time taken gives a velocity of 100 miles/hour southwest. However, since Miguel only flew for 0.5 hours, the velocity is halved to 50 miles/hour southwest. Therefore, the correct answer is 72 miles/hour southwest.