Question Library — KalmiPrep by Kalmitech

Physics UTME / JAMB 1993 Heat Energy & Temperature

A simple cell with mercury-amalgamated zinc electrode prevents

A

local actions

B

polarization

C

buckling

D

degradation

medium Difficulty

Physics UTME / JAMB 1993 Heat Energy & Temperature

A parallel plate capacitor of area 10cm2 in vacuum has a capacitance of 10-2\(\mu\)F. What is the distance between the plates?(e = 9 x 10-12fm)

A

9 x 10-13m

B

9 x 10-7m

C

9 x 10-3m

D

9 x 107m

medium Difficulty

Physics UTME / JAMB 1993 Heat Energy & Temperature

The primary aim in high tension transmission is to

A

minimize electrical energy losses due to heat production

B

increase the rate of energy transfer by using high voltage

C

increase the current in the wire

D

generate electricity at high current and low voltage

medium Difficulty

Physics UTME / JAMB 1993 Heat Energy & Temperature

Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of

A

\(\alpha\), X, and \( \beta\)

B

\(\alpha\), \(\beta\) and \(\gamma\)-rays

C

X, \(\alpha\), \(\gamma\)-ray

D

\(\alpha\), \( \beta\) and X-rays

medium Difficulty

Physics UTME / JAMB 1993 Heat Energy & Temperature

The kinetic theory of photoelectron liberated from a metallic surface depends on the

A

intensity of the incident radiation

B

time duration of the incident radiation

C

temperature of the incident radiation

D

frequency of the incident radiation

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following statements about solid friction is/are correct? I. Friction depends on the nature of the surfaces in contact II. Friction depends on the area of contact III. Friction always acts in the direction of motion.

A

I only

B

II only

C

III only

D

I and II only

E

I,II and III

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following is a scalar quantity?

A

Momentum

B

Acceleration

C

Displacement

D

Distance

E

Force

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

A

I, II and III

B

II and III only

C

I and III only

D

I and II only

E

III only

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following best explains why a person suffers a more severe burn when his skin is exposed to steam than when boiling water pours on his skin?

A

Steam is at a higher temperature than boiling water

B

Steam possesses greater heat energy per unit mass than boiling water

C

Steam spreads more easily over a wider area of the skin man boiling water

D

Steam penetrates more deeply into the skin than boiling water

E

the specific latent heat of vaporization is released in changing from boiling water to steam

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following instruments is used to measure relative humidity?

A

Hydrometer

B

Barometer

C

Manometer

D

Hypsometer

E

Hygrometer

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following statements is not correct?

A

A magnetic Held is a region where a magnetic force can be detected.

B

Magnetic fields are scalar quantities.

C

The magnitude of the magnetic force experienced by a moving charge depends on the speed on the charge.

D

the angle between the direction of the earth’s magnetic held and the horizontal is called the angle of dip.

E

Iron filings can be used to trace out the magnetic field around a bar magnet.

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following statements is correct about cathode rays? They are fast moving

A

atoms

B

ions

C

neutrons

D

protons

E

electrons

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following gives rise to the line spectra obtained from atoms?

A

Kinetic energy of a moving atom

B

Potential energy of an electron inside an atom

C

Change of an electron from a higher to a lower energy level in the atom

D

Disturbed proton in the nucleus

E

Excitation of an electron in the atom

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?

A

Polarization

B

Local action

C

Formation of hydrogen electrode

D

Increase in the resistance of the cell

E

Generation of less current by the cell

medium Difficulty

Physics WAEC / WASSCE 1992 Heat Energy & Temperature

(a) Explain what is meant by photoelectric emission (b) Draw a labelled diagram showing the structure of a simple type of a photocell and explain its mode of operation. (c) State four applications of photoelectric emission. (d) In a photocell, no electrons are emitted until the threshold frequency of light is reached. Explain what happens to the energy of the light before emission of electrons begins. State one factor that may affect the number of emitted electrons.

A

F = EA/eI

B

F = EAI/e

C

F = EAe/l

D

F = EAe

E

secondary emission

medium Difficulty