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.

- 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*

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

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

*(2)*

*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)*.

- By adding detergent/soap to the water.
- By adding camphor to the water.
- By adding oil to the water.
- By adding alcohol to the water.
- By boiling the water.
- By using grease.

*Choose any 3👆👆*

*(3)*

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

*(3b)*.

- Red hot rivets in ship.
- Removal of tight glass stopper.
- Bimetallic strip used in thermostat.
- Fitting of wheels in rims.
- 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:*

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

b. *Sound wave:*

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

*(8b)*.

- Reflection.
- Interference.
- Refraction.
- Diffraction.
- 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:*

- The forces can be represented in magnitude and direction by the sides of a triangle taken in order.
- All the three forces mist be concurrent.
- 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👇👇👇

12c. *Loading……*

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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