Physics : General knowledge questions and answers

Physics : General knowledge questions and answers

1. Scalars are quantities that are described by _____________

a. Magnitude
b. Direction
c. Magnitude & Direction
d. Motion

2. Which one is a scalar quantity?

a. Acceleration
b. Displacement
c. Speed
d. Velocity

3. What is the rate of acceleration of gravity?

a. 10 m/s/s
b. 9.8 m/s/s
c. 6.8 m/s/s
d. 7.8 m/s/s

ANSWER: b. 9.8 m/s/s

4. Vectors are the quantities that are described by _______________

a. Both magnitude & direction
b. Velocity
c. Magnitude
d. Direction

ANSWER: a. Both magnitude & direction

5. What does Displacement refer to?

a. It refers to how much ground an object has covered
b. It refers to how far out of place an object is
c. It refers to how fast an object is moving
d. It refers to the rate at which an object changes its position

ANSWER: b. It refers to how far out of place an object is

6. Speed is __________________________________________

a. Scalar quantity which does not keep track of direction
b. Scalar quantity which keeps track of direction
c. Vector quantity which does not keep track of direction
d. None of above

ANSWER: a. Scalar quantity which does not keep track of direction

7. Acceleration is _____________________________________

a. The speed at any given instant in time
b. The rate at which an object moves
c. The rate at which an object changes its velocity
d. None of the above

ANSWER: c. The rate at which an object changes its velocity

8. The acceleration of an object is _________________________

a. Directly proportional to force
b. Inversely proportional to mass
c. Directly proportional to force and inversely proportional to mass
d. Directly proportional to mass and indirectly proportional to force

ANSWER: c. Directly proportional to force and inversely proportional to mass

9. Increasing force tends to __________ while increasing mass tends to ______________

a. Increase acceleration, decrease acceleration
b. Increase acceleration, increase acceleration
c. Decrease acceleration, increase acceleration
d. Decrease acceleration, decrease acceleration

ANSWER: a. Increase acceleration, decrease acceleration

10. ‘An object at rest stays at rest and object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.’ This is which law of

Newton?

a. First law of motion
b. Second law of motion
c. Third law of motion
d. None of the above

ANSWER: a. First law of motion

11. What do you understand by inertia?

a. Ability of a substance to transfer heart energy to another physical system
b. Phenomenon observed whenever the source of waves is moving with respect to an observer
c. Tendency to resist changes in their state of motion
d. None of the above

ANSWER: c. Tendency to resist changes in their state of motion

12. According to Newton’s second law of motion acceleration of an object is dependent upon two variables. Which are those two variables?

a. The net force acting upon the object and the mass of the object
b. The total force acting upon the object and the mass of the object
c. The net force acting upon the object and the velocity of the object
d. None of the above

ANSWER: a. The net force acting upon the object and the mass of the object

13. Who developed the concept of inertia?

a. Newton
b. Galileo
c. Johannes Kepler
d. None of the above

14. What is the metric unit of force?

a. Joule
b. Watt
c. Newton
d. None of the above

15. What are the two variable on which the amount of momentum of an object is dependent?

a. Force and Displacement
b. Mass and Force
c. Mass and Displacement
d. Mass and Velocity

ANSWER: d. Mass and Velocity

16. What is potential energy?

a. Energy that is stored in an object due to its position relative to some zero position
b. Energy stored in an object as the result of its vertical position or height
c. Energy stored in elastic material as the result of their stretching or compressing
d. None of the above

ANSWER: a. Energy that is stored in an object due to its position relative to some zero position

17. One horsepower is equivalent to approximately ______

a. 650 Watts
b. 750 Watts
c. 850 Watts
d. None of the above

ANSWER: b. 750 Watts

18. What is conduction?

a. Transferring of heat from one object to another object through particle collisions
b. Process of heat transfer from one location to the next by the movement of fluids
c. Transfer of heat by means of electromagnetic waves
d. Process of separating opposite charges within an object

ANSWER: a. Transferring of heat from one object to another object through particle collisions

19. The change in temperature is the result of the gains and losses of __________ during collisions.

a. Potential energy
b. Electrons
c. Kinetic energy
d. Mechanical energy

ANSWER: c. Kinetic energy

20. Convection is the process of heat transfer from one location to the next by ________________

a. The movement of fluids
b. The movement of kinetic energy
c. The movement electromagnetic waves
d. None of the above

ANSWER: a. The movement of fluids

21. What is Polarization?

a. Process of separating same charges within an object
b. Process of removing excess charge on an object
c. Process of separating opposite charges within an object
d. None

ANSWER: c. Process of separating opposite charges within an object

22. What is Grounding?

a. Process of removing the excess charge on an object
b. Process of adding the excess charge on an object
c. Process of removing less charge on an object
d. Process of adding less charge on an object

ANSWER: a. Process of removing the excess charge on an object

23. Among the following which is the best conductor?

a. Metals
b. Silver
c. Graphite
d. Water

24. Insulators are _____________________________

a. Material that permit electrons to flow freely from atom to atom and molecule to molecule
b. Material that impede the free flow of neutrons from atom to atom and molecule to molecule
c. Materials that impede the free flow of electrons from atom to atom and molecule to molecule
d. None of the above

ANSWER: c. Materials that impede the free flow of electrons from atom to atom and molecule to molecule

25. Gravitational force is directly proportional to the ________ of the interacting objects.

a. Mass
b. Weight
c. Direction
d. Distance

26. Gravitational attraction is inversely proportional to the ___________________

a. Square of the mass
b. Square of the speed
c. Square of the weight
d. Square of the distance

ANSWER: d. Square of the distance

27. What is the shape of converging lens?

a. Relatively thick across their middle and thin at their upper and lower edges
b. Relatively thin across their middle and thin at their upper and lower edges
c. Relatively thick across their middle and thick at their upper and lower edges
d. None of the above

ANSWER: a. Relatively thick across their middle and thin at their upper and lower edges

28. What is the shape of diverging lenses?

a. Relatively thick across their middle and thin at their upper and lower edges
b. Relatively thick across their middle and thick at their upper and lower edges
c. Relatively thin across their middle and thick at their upper and lower edges
d. Relatively thin across their middle and thin at their upper and lower edges

ANSWER: c. Relatively thin across their middle and thick at their upper and lower edges

29. What is myopia?

a. It is the inability of the eye to focus on distant objects
b. It is the inability of the eye to focus on nearby objects
c. It is the ability of the eye to focus on distant objects
d. None of the above

ANSWER: a. It is the inability of the eye to focus on distant objects

30. Hyperopia is _____________________________

a. The ability of the eye to focus on nearby object
b. The inability of the eye to focus on nearby objects
c. The inability of the eye to focus on distant objects
d. The ability of the eye to focus on distant object

ANSWER: b. The inability of the eye to focus on nearby objects