Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 1990 Mechanics and Properties of Matter

A work of 30 joules is done is transferring 5 millicoulombs of charge from a point B to a point A in an electric Held. The potential difference between B and A is

A

1.7 x 10-4V

B

3.4x10-4V

C

1.5x10-1V

D

6.0 x103V

E

1.2 x104V

medium Difficulty

Physics WAEC / WASSCE 1990 Mechanics and Properties of Matter

A charge of 1.0 x 10-5 Coulombs experience force of 40N at a certain point in space. What is the electric field intensity?

A

8.00 x 106NC-1

B

4.00 x 106NC-1

C

4.00 x 10-4NC-1

D

2.00 x 10-4NC-1

E

2.50 x 10-1NC-1

medium Difficulty

Physics WAEC / WASSCE 1990 Mechanics and Properties of Matter

Birds can perch safely on overhead electric power cables without being electrocuted because

A

birds can withstand high p.d. of the electric power cables

B

any accumulated charge on the birds is quickly dissipated

C

the feet of the birds are well insulated

D

the current is a.c. and has particular direction

E

there is no p.d between the birds and the cables

medium Difficulty

Physics WAEC / WASSCE 1990 Mechanics and Properties of Matter

When the pressure of the gas in a discharge tube is gradually lowered. I. there is a violet glow in the tube II. the glow in the tube splits into bands which get further apart. III, the glow and the bands eventually disappear and there is a green fluorescence in the tube. IV. the tube breaks into pieces. Which of the following are correct?

A

I and II only

B

I and III only

C

I and IV only

D

I, II and III only

E

I, II III and IV

medium Difficulty

Physics WAEC / WASSCE 1990 Mechanics and Properties of Matter

Which of the following statements about the atom is/are correct? I. Energy is needed to remove electrons from an atom II. Particles in the nucleus of an atom are bound together by strong forces. III. A large amount of energy is required to separate the particles in the nucleus of an atom. IV. When the nucleus of a uranium atom is split, the energy released accounts for the difference in the masses of the products and the parent nucleus

A

I only

B

I and II only

C

I and III only

D

II and IV only

E

I, II, III and IV

medium Difficulty

Physics WAEC / WASSCE 1990 Mechanics and Properties of Matter

A metal is illuminated with a radiation of energy 6.88eV If the kinetic energy of the emitted electrons is 1.5OeV, calculate the work function of the metal.

A

0.22eV

B

4.59eV

C

5.38eV

D

8.38eV

E

10.32eV

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

A particle of mass M which is at rest splits up into two. If the mass and velocity of one of the particles are m and v respectively, calculate the velocity of the second particle

A

\(\frac{mv}{M}\)

B

\(\frac{Mv}{M - m}\)

C

\(\frac{mv}{M + m}\)

D

\(\frac{mv}{M - m}\)

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

Which of the following statements are correct about an object in equilibrium under parallel forces? i. the total clockwise moments of the forces about any point equals the total anti-clockwise moments about the same point. ii. the total forces in one direction equals the total forces in the opposite direction. iii. the resolved components along the x-axis equals the resolved components along the y-axis.

A

i and ii only

B

i and iii only

C

ii and iii

D

i, ii, and iii only

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

To keep a vehicle moving at a constant speed v, requires power P, from the engine. The force provided by the engine is

A

\(\frac{p}{v}\)

B

\(\frac{1}{2}\) v

C

pv

D

\(\frac{p}{v^2}\) v

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

A stone of mass m kg is held h meters above the floor for 50s. The work done in joules over this period is

A

mh

B

mgh

C

\(\frac{mgh}{50}\)

D

O

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

An inclined plane which makes an angle of 30o with the horizontal has a velocity ratio of

A

2

B

1

C

0.866

D

0.50

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

What is the length of liquid column in a barometer tube that would support an atmospheric pressure of 102000Nm-2 if the density of the liquid is 2600kgm-3? [g = 10ms-2]

A

0.75m

B

0.76m

C

3.92m

D

39.23m

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

40m3 of liquid is mixed with 60m3 of another liquid Q. If the density of P and Q are 1.00kgm-3 and 1.6kgm-3 respectively, what is the density of the mixture?

A

0.05kgm-3

B

1.25kgm-3

C

1.30kgm-3

D

1.36kgm-3

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

The pressure of a gas when cooled at constant volume will decrease because the molecules

A

collide less frequently with the walls of the container

B

have the same average kinetic energy

C

break up into smaller molecules

D

decrease in number

medium Difficulty

Physics UTME / JAMB 1990 Mechanics and Properties of Matter

Which of the following conditions will make water boil at a temperature of 100oC when the atmospheric pressure is 750mmHg?

A

increase the external pressure

B

reduce the external pressure

C

heat more rapidly at the same pressure

D

reduce the external pressure by a quarter

medium Difficulty