Fundamentals of Physics questions and answers 1-10
Why is it that when you match a rug in your room you feel worn but when you match on the floor which is in the same room temperature with the rug you feel cold?
Answer: It is because the cement floor is a good conductor of heat, therefore it conducts heat away from your feet far more than the rug in the say room temperature.
When a heavy stone of 200kg and a feather of 0.2kg are dropped from up at the same time to fall under the influence of gravity alone, which one will reach ground first.
Answer: Provided they fall under the influence of gravitational force alone as stated, both the stone and the feather will fall at the same time.
Why is it that when a stone of 200kg and feather of 0.2k , when dropped from the same height at the same time reach ground at the same time when they fall under the influence of gravity alone?
Answer: It is because of their Inertia
What is inertia?
Answer: Inertia is the tendency of a body to either remain in its state of rest or its uniform motion.
Does inertia of a body depend on its mass?
Answer: Yes the inertia of a body depends on its mass, that is the bigger the mass of the body the bigger the bigger the inertial of the body while the smaller the mass of the body the smaller the inertial of the body.
What is a vector quantity?
Answer: A vector quantity is the one that has both magnitude and direction. Examples; Velocity , force, acceleration, displacement and many other
What is a scalar quantity?
Answer: A scalar quantity is the one that has only magnitude but no direction. Examples; Distance, Speed and many more.
A system of two parallel, equal but opposite forces not acting along the same line is called what?
The turning moment of force is the product of one of the forces and the perpendicular distance between the lines of the action of the tow forces, true or false?
Define the center of the gravity
Answer: the center of gravity of a body is defending as the point through which its resultant weight acts. The center of gravity of a body in most cases is located at the center of the body.
Fundamentals of Physics questions and answers 11-20
While is not advisable to keep bucket of water insider room and leave it open?
Answer: Yes it not advisable to keep bucket of water and leave it open inside the room, because the water may evaporate and cause supersaturated environment inside, which may cause difficulty in breathing
What makes it possible for insects to perch and walk on the surface of water?
Answer: It is possible for insects to perch and walk on water because of the presence of surface tension on the surface of the water.
State ohm’s law
Answer: Ohm’s law state that the quantity of electric current passing through a metallic conductor is directly proportional to the potential difference across the two terminal provided the temperature is kept constant.
Why is it advisable to transmit electric power through a very long distance using high voltage instead of high current?
Answer: It is to minimize loss of power by heat and resistance when transmitted with high current.
Any component that offers opposition to the flow of current in circuit is called what?
The instrument use in measuring small current is called what?
What is the smallest magnet we can get?
Answer: The smallest Magnet we can get is one molecule
Magnet has north and south poles, true or false?
The best method to produce a magnet is by what method
Answer: Electric method
A material which is capable of being magnetized is called
Answer: Magnetic material
Fundamentals of Physics questions and answers 21-30
A suspended or pivoted magnet use in finding north and south is called
In magnet unlike poles attract each other while like poles repel each other, true or false
The electric charges at rest is called
Answer: Static electricity
The protons and neutrons are held together within the atomic nuclei by force called
The circulation of fresh air in a room is as a result of what
Fundamentals of Physics questions and answers 61-70
There two types of forces name them
Answer: Contact force and Field force
If we cut a bar magnet into two, which of these is true about it
(A) We obtain two magnets (B) we destroy the magnet
If a bar magnet is suspended freely
(A). It will continue to rotate (B). It will come to rest with its axis pointing North-South
(C). It will come to rest with its axis pointing East-West (D) it will lose its poles
How do you define electric circuit?
Answer: Electric circuit can be defined as the path provided for the flow of electric current
The smallest particle of an element which can take part in chemical reaction is called what?
The Brownian motion is important because of what?
Answer: Because, it is an evidence that molecule exist, and also evidence that molecules are not still but always in random motion
The tendency of gas to move from high concentration to low concentration is called what?
The nucleus of an atom consist of what
Answer: It consist of protons and neutrons
Which of these has no charge
(A). Neutron (B) Proton (C). Electron
In which of the following states of matter will its particle move most freely
(A) Solid (B) Gas (C) Liquid
Fundamentals of Physics questions and answers 71-80
State Hooke’s law
Answer: Hooke’s law state that extension of elastic material directly proportional to the load or effort applied provided the elastics limit is not exceeded
Define young modulus
The point at which elastic material lose its elasticity permanently and become plastic is called what?
Answer: Yielding point
A catapult is used to project stone. Which of the following energy conversions takes place as the stone is released?
(A) The kinetic energy of the stone is converted into gravitational potential energy
(B) The gravitational potential energy is converted into kinetic of the stone
(C) The elastic potential energy of catapult is converted into the kinetic energy of the stone
(D) The gravitational potential energy is converted to elastic energy
A substance of the same crystalline shape are referred to as what?
The arrangement of molecules in crystals is referred to as what?
Answer: Crystalline lattice
A substance that does not have definite or regular arrangement of atom is called what?
Answer: Amorphous substance. Example; glass or plastic
Which of these is not the property of crystals
(A) Regular arrangement of atom
(B) Definite melting point
(C) Crystals are soluble
(D) Crystals are insoluble
Answer:Crystals are insoluble
Which of these is not the property of amorphous substance
(A) Anhydrous (B) Insoluble (C) Hydrated (D) No definite melting point
The force of attraction between the molecule of the same element or substance is what?
Answer: Cohesion Force
Fundamentals of Physics questions and answers 81-90
The force of attraction between the molecules of difference element of substance is called what?
Answer: Adhesion Force
The tendency of a liquid either to rise or fall in narrow capillary tube is called ..
The force of tension acting parallel to the surface of a liquid is known as
Answer: Surface Tension
The internal friction which exists between the layers of liquid or gas in motion is called
Water wet glass but mercury does not, why?
Answer: It is because the force of cohesion of water molecule is far less than its force of adhesion to glass and therefore wet glass, while the force of cohesion of mercury molecule is far greater than its force of adhesion to glass and therefore does not wet glass
(D) A spherical drop of water forming slowly from a tap
State the parallelogram law of vector
Answer:The parallelogram law of vector states that if two vectors are represented in magnitude and direction by adjacent of parallelogram, the resultant is represented in magnitude and direction by the diagonal of the parallelogram drawn from the common point
What is the resultant of two equal forces each of magnitude F acting at right angle to each other?
Fundamentals of Physics questions and answers 91 -100
State principle of moment
Answer: The principle of moment states that if a body is in equilibrium then the sum of the clockwise turning moment acting upon it about any point equals the sum of the anticlockwise turning moment about the same point
Define the turning moment of a couple
Answer: The turning moment of a couple is defined as the product of one of the forces and the perpendicular distance between the lines of action of the forces.
Define the moment of a force about a point
Answer: The moment of a force about a point is defined as the product of the force and the perpendicular distance from the point to line of the action of force.
When a body is slightly pushed and it tend to move on father away from it origin position, the body is said be in what equilibrium?
Answer: The body is unstable equilibrium
If a body is slightly pushed and it tend to come to rest in its new position, the body is said be in what equilibrium?
Answer: Neutral equilibrium
When body a receive a slight displacement and it tend to return to its original position, the body is said to be in what equilibrium?
Answer: the body is in stable equilibrium
Why is it advisable to load a lorry on its floor instead on top of it?
Answer: It is advisable be when loaded on the floor it lowers the center of gravity thereby making the lorry stable.
When a bucket of water is being drawn out from a well, the bucket appears very light if is still insider the water but regain it weight immediately is out of water. Why?
Answer:It is because while the bucket is still in the water upward force called upthrust is exerted on the bucket by water.
State the Archimedes’ principle
Answer: Archimedes’ principle state that when an object is Wholly or partially immersed in a fluid, it experience a loss in weight or upthrust which is equal to the weight of the fluid displaced by the object.
State the principle flotation
Answer: The principle flotation state that for an object to float on a liquid the upthrust exerted on it by the liquid must be equal to the weight of the object