2020 ONDO STATE JOINT PHYSICS QUESTIONS AND ANSWERS NOW AVAILABLE

1a)

Under Mass

i) Mass is the quantity of matter present in a body.

ii) Mass is constant.

1. Mass is a scalar quantity.

iv)The unit of mass is kg or g.

v) Mass is measured by chemical or beam balance which uses the principles of moment.

Under weight

i) Weight occurs due to the force of gravity acting upon an object.

ii) Weight varies.

iii) Weight is a vector quantity.

iv) The unit of weight is Newton (N).

v)Weight is measured by spring or lever balance which ones Hooke’s law.

1b)…….

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ONDO STATE PHYSICS JOINT EXAM SOLUTIONS

(1a.) TABULATED👇

under Mass

1. Mass is the quantity of matter present in a body.
2. Mass is constant.
3. Mass is a scalar quantity.
4. The unit of mass is kg or g.
5. Mass is measured by chemical or beam balance which uses the principles of moment. under weight
6. Weight occurs due to the force of gravity acting upon an object.
7. Weight varies.
8. Weight is a vector quantity.
9. The unit of weight is Newton (N).

# 5. Weight is measured by spring or lever balance which ones Hooke’s law

(2)

1. Surface tension is defined as the force per unit length on either side of the imaginary line drawn on the liquid surface at rest. OR Surface Tension is the force that causes the surface of a liquid yo act like a stretched elastic skin.

(2b).

1. By adding detergent/soap to the water.
2. By adding camphor to the water.
3. By adding oil to the water.
4. By adding alcohol to the water.
5. By boiling the water.
6. By using grease.

# Choose any 3👆👆

(3)
3a. Linear Expansivity is defined as the increase in length per unit rise in temperature.

(3b).

1. Red hot rivets in ship.
2. Removal of tight glass stopper.
3. Bimetallic strip used in thermostat.
4. Fitting of wheels in rims.
5. Fire alarms e g. Electric bell.

# Choose any 3. 👆👆

(4)

I. MAXIMUM HEIGHT OF A PROJECTILE:- This is defined as the height vertical distance reached as measured from the horizontal projection plane.

H = U² Sin² tita/2g
Mathematically👆

II. HORIZONTAL RANGE OF A PROJECTILE:- This is defined as the horizontal distance from the point of projection to the point where the projectile hits the projection plane again.

R = U² Sin2tita/g

# Mathematically 👆

(8).
I. Wave is formed as a result of the disturbance of an elastic medium.

II. Tabulated
a. Light wave:

1. this are waves that do not require or need a material medium for its propagation.
2. They are undeflected in electric and magnetic fields.

b. Sound wave:

1. this are wave that require a material medium for their propagation.
2. They are deflected in electric and magnetic fields

(8b).

1. Reflection.
2. Interference.
3. Refraction.
4. Diffraction.
5. Polarization.

Choose any 3 here👆

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(12)
12a.
I. Moment of a force: moment of a force about a point is the product of the force and the perpendicular distance of it’s line of action from the point.

II. Moment of a couple: This is a pair of equal and parallel force acting on a body in opposite direction and whose lines of action do not coincide, which results in the rotation of the body about its axis.

(12bi). Conditions are:

1. The forces can be represented in magnitude and direction by the sides of a triangle taken in order.
2. All the three forces mist be concurrent.
3. If any object is in equilibrium under the actions of the three forces, the resultant of the two forces mist be equal and opposite to the third force.

12bii.
Stable equilibrium: A body is said to be in stable equilibrium if it tends to return to its original position when slightly displaced.

Make sure you draw the diagram of stable equilibrium👇👇👇

12d. Archimedes’s Principle states that when a body is immersed completely or partially in a liquid (water), it experiences an upthrust (apparent loss of weight) which is equal to the weight of the liquid displaced by it.

Mathematically, W1 – W2 = pVg

W1 – W2 = W3 is equivalent to (loss in weight).

💨💨

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