Question Library — KalmiPrep by Kalmitech

Physics UTME / JAMB 1998 Heat Energy & Temperature

An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because

A

ebonite has a negative charge while glass has a positive charge

B

ebonite has a positive charge while glass has a negative charge

C

both have negative charges

D

both have positive charges

medium Difficulty

Physics UTME / JAMB 1998 Heat Energy & Temperature

Which of the following can be used to reduce local action in a Laclanche cell?

A

A carbon rod as the positive pole

B

Pure zinc as the negative pole

C

Potassium permanganate solution in contact with the positive pole

D

common salt solution

medium Difficulty

Physics UTME / JAMB 1998 Heat Energy & Temperature

A parallel plate capacitor has a common plate area of 5 x 10\(^{-8}\)m2 and plate separation of 2 x 10\(^{-3}\)m, Assuming free space, What is the capacitance? [\(\varepsilon\)o = 9.0 X 10-\(^{-12}\)C2N-1m-2]

A

2.25 x 10-17F

B

4.50 x 10-17F

C

2.25 x 10-16F

D

4.50 x 10-16F

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

A piece of stone attached to one end pf string is whirled round in a horizontal circle. When the string is suddenly cut, the stone will

A

move towards te centre of the circle

B

stop moving immediately

C

move along a circular path of smaller radius

D

fly off in a direction tangential to the circular path

E

acquire greater centripetal force

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

The term torque means

A

the moment

B

the resultant of several forces acting on a body in equilibrum

C

two equal and oposite forces whose lines of action do not coincide

D

two coplaner forces at right angles to each other

E

the equilibrant of two concurrent forces

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

The inside of a vacuum flak is usually coated with silver to reduce heat loss by

A

evaporation

B

radiation

C

conduction

D

convention

E

condensation

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

As the end Q of the plank is raised, the component of W, normal to plank, will

Attached Figure / Diagram

A

increase

B

decrease

C

remain the same

D

be slightly greater than W

E

be independent of w

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

A piece of metal is heated until it becomes red-hot, it is then quickly transferred into a beaker containing boiling water. What effect will this have on the boiling water?

A

the boiling water rises slightly

B

the boiling point rises sharply

C

the rate of vaporisation of the boiling water increases

D

the boiling point first rises and then falls

E

neither the boiling point nor the rate of vaporisation increases

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

If an ebonite rod is rubbed with fur

A

both the ebonite rod and the fur will be negatively charged

B

the ebonite rod will be positively charged while the fur will have no charge

C

there will be electron transfer only if the ebonite rod is earthed

D

the ebonite rod will be negatively charged while the fur will be positively charged

E

the ebonite rod will be positively charged while the fur will be negatively charged

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

An eclipse of the sun by the moon occurs when the sun, the moon and the earth are in a straight line and the

A

earth casts a shadow on the moon

B

moon casts a shadow on the sun

C

moon is between the sun and the earth

D

earth is between the sun and the moon

E

sun is between the moon and the earth

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

Which of the following are both mechanical and transverse?

A

infra-red rays

B

gamma rays

C

sound waves

D

water waves

E

micro waves

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

The diagram above illustrates a freely suspended bar magnet NS hanging from a point in a horizontal ceiling. The thread used for suspending the magnet and the axis of the magnet are as indicated on the diagram. The angle marked \(\theta\) is called the angle os

Attached Figure / Diagram

A

depression

B

declination

C

variation

D

elevation

E

dip

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

Lenz's law of electromagnet states that

A

the induced charge is constant for a fixed change of force

B

a force is exerted on a current-carrying conductor in a magnetic field

C

the magnitude of the induced e.m.f in a circuit is proportional to the rate of change of the number of lines of force linking the circuit

D

the induced current in a conductor is in such a direction as to oppose the change producing it

E

e.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

The diagram above represents a section of a pair of vernier calipers. The reading on the instrument is

Attached Figure / Diagram

A

5.22cm

B

5.24cm

C

5.26

D

5.35

medium Difficulty

Physics WAEC / WASSCE 1998 Heat Energy & Temperature

Which of the following explains the concave meniscus of water in a clean glass tube? the

A

adhension between water and glass molecules is greater than the sdhension between water molecules

B

cohension between water molecules is greater then the adhension between glass and water molecule

C

molecules of water near the glass move faster than the molecules at the centre of the tube

D

molecules of water at the water-air boundary are often attracted to the centre of the tube

E

weight of the water pulls the centre part of the surface down

medium Difficulty