Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

A particle starts from rest and moves with a constant acceleration of 0.5 ms-2? Calculate the time taken by the particle to cover a distance of 25m.

A

25s

B

7.1s

C

10.0s

D

50.0s

E

100.0s.

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

A block of material of volume 2 X 10\(^{-5}\)m\(^3\) and density 2.5 x 10\(^3\) kgm\(^{-3}\) is suspended from a spring balance with half volume of the block immersed in water. What is the reading of the spring balance? (Density of water =1.0x10\(^3\) kg m\(^{-3}\) g = 10 ms\(^{-2}\)).

A

0.10N

B

0.25N

C

0.30N

D

0.40N

E

0.50N

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

An object is projected with a velocity of 100 ms\(^{-1}\) from the ground level at an angle \(\theta\) to the vertical. If the total time of flight of the projectile is 10 s, calculate \theta. (g = 10 ms\(^{-2}\)).

A

0o

B

30o

C

45o

D

60o

E

90o

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

If the temperature of water is gradually increased from 0o to 4oC, the density of the water within this range

A

increases for a while and then decreases

B

decreases for a while and then increases

C

increases gradually

D

decreases gradually

E

remains the same

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

A gas has a volume of 546 cm3 at OºC. What is the volume of the gas at -100ºC if its pressure remains constant?

A

346cm3

B

446cm3

C

546cm3

D

646cm3

E

746 cm3.

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

A household refrigerator consumes electrical energy at the rate of 200 W. lf electricity costs 5 k per kWh, calculate the cost of operating the appliance for 30 days.

A

N7.20

B

N12.00

C

N30.00

D

N33.33

E

N72.00

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

Calculate the escape velocity of a satellite launched from the earth’s surface (Take g as 10ms-2 and the radius of the earth as 6.4 x 106m)

A

8.00 x 106ms-1

B

1.13 x104ms-1

C

3.58x102ms-1

D

5.59 x10-2ms-1

E

3.95x10-2ms-1

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

In a purely resistive a.c. circuit, the current I = Io sin wt and voltage, V = Vo sin wt. Calculate the instantaneous power dissipated in the circuit in time t.

A

Io Vo

B

2Io Vosin wt

C

(Io Vo)/2

D

Io Vo sin2wt

E

I2o V2o

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

A point charge of 1.0 x 10-7 C experiences force of 0.01 N in a uniform electric field. Calculate the magnitude of the strength of the field

A

106 Vm-1

B

105 Vm-1

C

10-5 Vm-1

D

102 Vm-1

E

109 Vm-1

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

Which of the following have the greatest penetrating power?

A

Beta rays

B

Alpha rays

C

Gamma rays

D

Electrons

E

Neutrons

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

A particle of charge 5C moves perpendicularly to a magnetic Held of magnitude C.01 T. If the velocity of the charge is 1.5ms'2, calculate the magnitude of the force exerted on the particle

A

0.050 N

B

0.075N

C

0.0300N

D

3.300N

E

0.000N

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

Electrical resistance is the property of an electrical conductor that causes electrical energy to be converted into

A

mechanical energy

B

solar energy

C

heat energy

D

magnetic energy

E

chemical energy.

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

24 Na → 24 mg4 + X + energy 11 2 The equation above represents a nuclear decay of sodium isotope. What is X?

A

Alpha particle

B

Beta particle

C

Gamma ray

D

X-ray

E

Neutron

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

lf Einstein’s photoelectric equation is represented by hf - W = Φ where h is Planck’s constant, f the frequency of incident radiation and W the work function of the material, what does the symbol Φ up stand for?

A

Energy of the photons

B

Maximum Kinetic energy of the ejected electrons

C

Threshold frequency of the photons

D

Stopping potential of the electrons

E

Velocity of the electrons

medium Difficulty

Physics WAEC / WASSCE 1993 Mechanics and Properties of Matter

According to the kinetic theory of gases the collision of the molecules of a gas with the wall of the container is mainly responsible for the l. temperature of the gas ll. viscosity of the gas Ill. pressure of the gas Which of the statements above is/are correct?

A

I only

B

II only

C

III only

D

II and III only

E

I, II and III.

medium Difficulty