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1. Electrostatic force is ________.
A. The force exerted by a charged body
B. The force exerted by the gravity
C. Example of a contact force
D. None of the above
ANSWER:A
SOLUTION :The force exerted by a charged body on another charged body is known as electrostatic force. This force comes into play even when the bodies are not in contact. The electrostatic force, therefore, is an example of a non-contact force.
2. Zero acceleration means _________.
A. The velocity of the object is constant
B. The velocity of the object is low
C. The velocity of the object is zero
D. The velocity of the object increases
ANSWER:A
SOLUTION:Zero acceleration means an object’s velocity is not changing. It’s important to note that zero acceleration does not necessarily mean an object is at rest. It can be at rest, but it also can be traveling at a constant velocity.
3. The rate of change in momentum of a body is proportional to _______.
A. Applied displacement
B. Applied force
C. Applied potential energy
D. Applied pressure
ANSWER:B
SOLUTION:The rate of change of momentum of a body is directly proportional to the applied force. This is according to Newton’s second law of motion. The change in momentum also takes place in the same direction as the applied force.
4. The motion of a body around a circular path is an example of _______.
A. Uniform velocity, variable acceleration
B. Uniform speed, uniform velocity
C. Uniform speed, variable velocity
D. Uniform speed, variable acceleration
ANSWER:C
SOLUTION:The motion of a body around a circular path is an example of uniform speed and variable acceleration. This is called uniform circular motion, which is a type of circular motion where the body moves in a circle at a constant speed. However, the direction of the body’s velocity changes continuously, so its acceleration also changes.
5. The speed of an ant is 75 cm/sec. The ant travels in a day is ________.
A. 64800 m / day
B. 648000 m/day
C. 648000 cm/day
D. 64800000 cm/day
ANSWER:B
SOLUTION:648000 m/day
6. Newton’s Third Law of Motion applies to which of the following situations?
A. When a person jumps from the boat to the river, the boat goes backwards
B. Passengers standing in a bus fall in the back direction, when the stationary bus suddenly moves
C. When a person falls on the cement floor, he gets hurt
D. While catching a fast moving cricket ball, a fielder puts his hands backwards
ANSWER:A
SOLUTION : When a person jumps from the boat to the river, the boat goes backwards.
7. For every action there is an equal or opposite reaction. The law was given by ________.
A. Newton
B. Albert Einstein
C. Bohr
D. Handane
ANSWER:A
SOLUTION:Sir Isaac Newton’s third law of motion states that “for every action, there is an equal and opposite reaction”.
8. Newton’s second law of motion________.
A. Explains the relationship between forces on two mutually effective objects
B. Also known by the law of inertia
C. It is helpful to understand the effects of force
D. Also known by the law of conservation of energy
ANSWER:C
SOLUTION: The ratio of the speed of light in a vacuum to the speed of light in a medium is called the refractive index. It’s also known as the absolute refractive index.
9. What was the year of publication of Newton’s laws of motion ?
A. 1678
B. 1778
C. 1787
D. 1687
ANSWER:D
SOLUTION: The three laws of motion were first stated by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), originally published in 1687.
10. Which one of the following statements is not correct ?
A. If the velocity and acceleration have opposite sign, then the object is slowing down
B. If the velocity is zero at an instant, then the acceleration should also be zero at that instant
C. If the velocity is zero for a time interval, then the acceleration is zero at any instant within the time interval
D. If the position and velocity have opposite sign, then the object is moving towards the origin
ANSWER:B
SOLUTION: If the velocity is zero at an instant, then the acceleration should also be zero at that instant