Question

1.1: Multiple Choices. Choose the best answer to the following questions?

1. Which of the following combination of fundamental physical quantities can be used to express force?
(a)Time, length and mass, (b) acceleration, length and time (c) Acceleration and mass

2. The resultant of two vectors with respective values of 3N and 4N cannot be? (a) IN (b) 5N (c) 7N
3. Which of the following sets of units of basic physical quantities?
(a)Kg, N and Amp(b) m/s, mole and Pa (c) Kg. Sec and Amp
4. Which of the following sets contains only fundamental physical quantity?
(a) Time, force, charge and mass (b) mass, length, temperature and current (d) Torque, time and temperature (c)Length, energy, power and temperature
5. A car is travelling due West at 20Km/hr. This statement best describe the physical quantity . (a) Acceleration (b) Direction (c) Velocity (d) Speed
8. Which of the following sets all have vector quantity? (a) Velocity, displacement, force and energy. (c) Force, acceleration, temperature and velocity
9. An airplane travel to London at 400Km/hr each hour. This statement best describes the physical quantity? (a) Acceleration (b) Direction (c) Velocity (d) Speed

11.As the angle between two vectors increases from 0° to 180° then the resultant of these vectors....... (a) Increases (b) Decreases (c) Remain constant
12.If the sum of two vectors is zero, then which of the following statement is incorrect? (a) The vectors are equal in magnitude and opposite in direction (c) Each vector may be equal to zero.
13. The magnitude of vectors A and B are 12 units and 20 units respectively. The largest and smallest resultant vectors are (a) 31N and 10N (b) 8N and 10N (d) 240N and 120N (c) 31N and 8N . ​

Answer 1

In physics, force can be expressed using the combination of acceleration and mass. The resultant of two vectors with values of 3N and 4N cannot be 7N. The units for basic physical quantities include m/s, mole, and Pa.

Step-by-step explanation:

1. The combination of fundamental physical quantities that can be used to express force is option (c) Acceleration and mass. This is because force is defined as the product of mass and acceleration (F = ma).
2. The resultant of two vectors with respective values of 3N and 4N cannot be 7N. This is option (c).
3. The correct set of units for basic physical quantities is option (b) m/s, mole, and Pa.
4. The set that contains only fundamental physical quantities is option (b) mass, length, temperature, and current.
5. The statement that best describes the physical quantity in the given scenario is option (c) Velocity. Velocity is the speed of an object in a given direction.
6. The set that consists of vector quantities is option (a) Velocity, displacement, force, and energy.
7. The statement that best describes the physical quantity in the given scenario is option (d) Speed. Speed is the magnitude of velocity and does not have a direction.
8. As the angle between two vectors increases from 0° to 180°, the resultant of these vectors decreases. This is option (b).
9. If the sum of two vectors is zero, then the statement that is incorrect is option (c) Each vector may be equal to zero. At least one of the vectors must have a magnitude greater than zero if their sum is zero.
10. The largest and smallest resultant vectors from vectors A and B with magnitudes of 12 units and 20 units respectively are 31N and 8N. This is option (c).