Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

Heat transfer by convection in a liquid is due to the

A

translatory motion of the molecules of the liquid

B

increased vibration of the molecules of the liquid about their mean positions

C

expansion of the liquid as it is heated

D

latent heat of vaporization of the liquid

E

ability of the liquid to evaporate at all temperatures

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?

A

Wrapping it in cotton wool

B

painting it black

C

Placing it in a vacuum

D

Placing it on rubber supports

E

Keeping it in a closed wooden box

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

The diagram above shows an incident ray A, inclined at angle of 50o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

Attached Figure / Diagram

A

sin50o/sin40o

B

sin40osin50o

C

sin90o/sin50o

D

sin40o/sin90o

E

sin90o/sin40o

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

The diagram above shows an incident ray A, inclined at angle of 50º to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

Attached Figure / Diagram

A

sin50o/sin40o

B

sin40osin50o

C

sin90o/sin50o

D

sin40o/sin90o

E

sin90o/sin40o

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

The eye defect illustrated by the diagram above is

Attached Figure / Diagram

A

astigmatism

B

long sightedness

C

loss accommodation

D

short sightedness

E

colour blindness

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

What is the value of R when G shows no deflection in the circuit illustrated above?

Attached Figure / Diagram

A

80Ω

B

75Ω

C

45Ω

D

20Ω

E

10Ω

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

A

330

B

165

C

146

D

119

E

73

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

(a) Explain the terms nuclear fission and nuclear fusion. (b) State two advantages of fusion over fission and explain briefly why, in spite of these advantages, fusion is not normally used for the generation of power. (c) \(^{238} _{92} U\) is a long half- life alpha emitter and decays to thorium Th which, in turn decays by beta emission with a small decay constant to an isotope of protactinium Pa. The protactinium decay scheme of \(^{238} _{92} U \) as stated above. (d) State three uses of radioisotopes.

A

Diffusion

B

Brownian motion

C

Diffraction

D

Crystal structure

E

Photoelectricity

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

Water does not drip through an open umbrella of silk material unless the inside of the umbrella is touched. Which of the following phenomena is responsible for this?

A

Surface tension

B

Hydrostatic upthrust

C

Viscosity

D

Diffusion

E

Osmosis

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

Viscosity in a liquid does not depend on the

A

nature of the liquid

B

relative velocity between the liquid layers

C

area of the surfaces in contact

D

temperature of the liquid

E

normal reaction between the liquid layers

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

What is the difference between a crystalline and an amorphous solid? A crystalline solid

A

has cubic structure while amorphous solid has hexagonal structure

B

has regularly-repeating pattern while an amorphous solid has not

C

is white while amorphous solid is yellow

D

is always hard while amorphous solid is always soft

E

melts on heating while an amorphous solid sublimates on heating.

medium Difficulty

Physics WAEC / WASSCE 1990 Heat Energy & Temperature

Which of the following is not an evidence of the particle nature of matter?

A

Diffusion

B

Brownian motion

C

Diffraction

D

Crystal structure

E

Photoelectricity

medium Difficulty

Physics UTME / JAMB 1990 Heat Energy & Temperature

Which of the following is a fundamental unit?

A

Newton

B

Watt

C

Joule

D

Second

medium Difficulty

Physics UTME / JAMB 1990 Heat Energy & Temperature

A body of mass 10kg rests on a rough inclined plane whose angle of tilt \(\theta\) is variable. \(\theta\) is gradually increased until the body starts to slide down the plane at 30o. The coefficient of limiting friction between the body and the plane

A

0.30

B

0.50

C

0.58

D

0.87

medium Difficulty

Physics UTME / JAMB 1990 Heat Energy & Temperature

Shadows and eclipses result from the

A

refraction of light

B

rectilinear propagation of light

C

defraction of light

D

reflection of light

medium Difficulty