RNT1 General Physics
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Free RNT1 General Physics Questions
1. The value of acceleration due to gravity, i.e., 'g', is:
- 9.8 meters/second squared
- -9.8 meters/second squared
- 9.8 meters per second
- 9.8 meters per square
Explanation
The standard acceleration due to gravity near the Earth's surface is approximately 9.8 meters per second squared (9.8 m/s²). This value represents the rate at which objects accelerate downward under the influence of Earth’s gravitational force, regardless of their mass.
2. To say an object is being uniformly accelerated means?
- It is moving with a constant velocity.
- It is always moving in the same direction.
- It is moving with a constant acceleration.
- Its acceleration is constantly changing.
Explanation
Uniform acceleration refers to a situation in which an object's acceleration remains constant over time. This means the rate of change of velocity is the same in each time interval. The object’s velocity changes steadily, but the acceleration itself does not vary. Constant velocity or changing acceleration would not meet the criteria for uniform acceleration.
3. According to Newton's third law of motion, which statement accurately describes the relationship between action and reaction forces?
- Action and reaction forces act on the same object and can cancel each other out.
- Action and reaction forces are equal in magnitude and opposite in direction, acting on different objects.
- Action forces are always greater than reaction forces, leading to acceleration.
- Reaction forces occur only when an object is in motion.
Explanation
Newton’s third law states that for every action, there is an equal and opposite reaction. These forces are equal in magnitude and opposite in direction, but they act on different objects, not the same object. This law explains interactions such as a rocket propelling upward while pushing exhaust gases downward or a swimmer pushing water backward to move forward.
4. Average speed is the total distance divided by the
- average distance.
- average acceleration.
- total time.
- slope.
Explanation
Average speed is defined as the total distance traveled divided by the total time taken. It measures how fast an object moves on average over a period of time, regardless of changes in velocity during the motion. It is not related to average distance, acceleration, or slope, as these describe different aspects of motion.
5. Why are standard units important?
- Because they reduce the cost of scientific experiments.
- Because they make mathematics more challenging.
- Because they restrict the creativity of scientists.
- Because they make measurements consistent and easily understood.
Explanation
Standard units are important because they provide a uniform framework for expressing measurements. This consistency ensures that measurements are accurate, reproducible, and easily understood across different locations, experiments, and scientific disciplines. Standard units allow scientists and engineers to communicate results without ambiguity.
6. Which technique is commonly used in the graphical method to determine the resultant of multiple vectors?
- Adding the vectors algebraically
- Drawing the vectors to scale and connecting them head-to-tail
- Calculating the average of the vectors
- Using trigonometric functions to resolve the vectors
Explanation
In the graphical method for finding the resultant of multiple vectors, vectors are drawn to scale and arranged head-to-tail. The resultant vector is then drawn from the tail of the first vector to the head of the last vector. This visual approach accounts for both magnitude and direction and is commonly used when a precise analytical solution is not required.
7. Which statement is NOT true ?
- Displacement depends on the starting and ending position
- Distance depends on the path traveled
- Distance includes both magnitude and direction
- Distance is a scalar while displacement is a vector
Explanation
Distance is a scalar quantity and only measures the total length of the path traveled, without considering direction. It does not include both magnitude and direction; that description applies to displacement, which is a vector defined by the straight line from the starting to the ending position. Therefore, the statement claiming that distance includes both magnitude and direction is not true.
8. If an object moves with constant velocity,
- its speed is constant
- its direction is constant
- its average speed is constant
- its distance traveled per unit time is constant
- all of these
Explanation
Constant velocity means that both the speed and direction of an object remain unchanged over time. As a result, the object's average speed, instantaneous speed, and distance traveled per unit time are all constant. Therefore, all the listed statements accurately describe the characteristics of motion at constant velocity.
9. Which of the following statements best represents the relationship between forces and accelerations according to Newton's second law?
- Forces always cause objects to move at a constant speed.
- Forces have magnitude but no direction, leading to unpredictable accelerations.
- Forces result in accelerations, with the acceleration being directly proportional to the net force applied and inversely proportional to the mass of the object.
- Forces cause objects to change shape but do not affect their motion.
Explanation
Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (( a = F_net / m )). This relationship explains how forces affect motion in a predictable way, taking both magnitude and direction into account. Forces do not inherently cause constant speed or unpredictable motion, nor do they only affect shape without influencing acceleration.
10. Derived measurements are
- combinations of the fundamental dimensions which are useful in characterizing the physical property or behavior of objects.
- conversion factors to relate the English system to the mks system.
- always required to have all three fundamental dimensions.
- conversion factors to relate the English system to the cgs system.
Explanation
Derived measurements are quantities formed by combining fundamental quantities (such as mass, length, and time) using mathematical operations like multiplication or division. Examples include velocity (length/time), acceleration (velocity/time), and force (mass × acceleration). These measurements are useful for characterizing physical properties and behaviors of objects, going beyond the basic fundamental quantities.
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