WAEC SSCE - Physics - 1991 (Objective)

Pregunta 1 Informe

The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere

76cm of Hg

75cm of Hg Respuesta correcta

74cm of Hg

60cm of Hg

45cm of Hg

Pregunta 2 Informe

Pregunta 3 Informe

Pregunta 4 Informe

Using the data in the circuit illustrated above, calculate the value of R

0.02\(\Omega\)

0.05\(\Omega\)

5.00\(\Omega\)

20.00\(\Omega\)

50.00\(\Omega\) Respuesta correcta

Pregunta 5 Informe

Pregunta 6 Informe

Pregunta 7 Informe

Pregunta 8 Informe

Pregunta 9 Informe

Pregunta 10 Informe

Pregunta 11 Informe

Pregunta 12 Informe

The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W

300N

200N

140N

120N Respuesta correcta

20N

Pregunta 13 Informe

Pregunta 14 Informe

In the circuit above R is a resistor whose resistance increases with increases with increase in temperature L₁ and L₂ are identical lamps. If the temperature of R increases

L₁ becomes brighter and L₂ becomes dimmer Respuesta correcta

L₁ becomes brighter and L₂ does not change

L₂ becomes dimmer and L₁ does not change

L₁ becomes dimmer and L₂ does not change

L₁ and L₂ becomes brighter

Pregunta 15 Informe

Pregunta 16 Informe

Pregunta 17 Informe

Pregunta 18 Informe

Which of the following statements is true of the diagram shown above?

the two point, A and B are in phase Respuesta correcta

distance AB is halgf the wavelength of the wave

AC and BD are the amplitude of the wave

the two points A and B represents the wave crests

the wave has four crests

Pregunta 19 Informe

the diagram above shows the position of a simple pendulum set in motion. At which of the positions does the pendulum have maximum kinetic energy?

5

4

3 Respuesta correcta

2

1

Pregunta 20 Informe

Pregunta 21 Informe

Pregunta 22 Informe

The diagram above represents six maximum and minimum thermometer. If the temperature of the surrounding falls, which of the following correctly states how the thermometer would respond to the change in temperature?

S₁, would move upward but S₂ would not move

S₁ would not move but S₂ would move upwards Respuesta correcta

both S₁ and S₂ would move upwards

S₁ would move downwards and S₂ would move downwardw

S₁ would move downwards and S₂ wouldnmove downwards

Pregunta 23 Informe

Pregunta 24 Informe

Pregunta 25 Informe

Pregunta 26 Informe

In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend to concentrate most?

A

B

C

D

E Respuesta correcta

Pregunta 27 Informe

Pregunta 28 Informe

Pregunta 29 Informe

Pregunta 30 Informe

Pregunta 31 Informe

Pregunta 32 Informe

If the frequency of the e.m.f. source in the a.c. circuit illustrated above is \(\frac{500}{\pi}\)Hz. What is the reactance of the inductor?

450

0.9

900 Respuesta correcta

567

43

Pregunta 33 Informe

Pregunta 34 Informe

Pregunta 35 Informe

Pregunta 36 Informe

The diagram above shows a current carrying wire between the poles of a magnet. In which direction would the wire tend to move?

into the paper

out of the paper Respuesta correcta

towargs the north pole of the magnet

towards the south pole of the magnet

towards the top of the pages

Pregunta 37 Informe

Calculate the refractive index of the material of the glass block shown in the diagram if YZ = 4cm

0.40

0.60

1.50

1.67 Respuesta correcta

2.50

Pregunta 38 Informe

Pregunta 39 Informe

The graph above shows the expansion of water as the temperature increases from 0^oC. Which of the following deductions from the graph are true? i. Water has its maximum density at Q. ii. The volume of water is greater at 0^oC than at 4^oC. iii. The volume of water decreases uniformly when cooled from 100^oC. iv. When water solidifies, its volume increases

i and ii only

i and iii only

ii and iii only

i, ii and iii only

i, ii and iv only Respuesta correcta

Pregunta 40 Informe

Pregunta 41 Informe

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Pregunta 44 Informe

Pregunta 45 Informe

Pregunta 46 Informe

Pregunta 47 Informe

Two capacitors C₁ and C₂ are connected as shown in the diagram. The capacitance C₂ is twice C₁ when the key is opened the energy stored up in C₁ is W. If the key is later closed and the system is allowed to attain electrical equilibrium, the total energy stored in the system will be

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

\(\frac{2}{3}\)W

W

2w

3W Respuesta correcta

Pregunta 48 Informe

Pregunta 49 Informe

Two mirrors are inclined as shown in the diagram. A ray of light RO strikes the arrangement at O and emerges along PO. The emergent ray has been deviated through

240^o

180^o Respuesta correcta

120^o

60^o

30^o

Pregunta 50 Informe

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Pregunta 53 Informe

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Pregunta 56 Informe

Pregunta 57 Informe

Pregunta 58 Informe

In the arrangement illustrated above, Y and B are yellow and blue transparent light filters respectively through the filters is

blue

red

yellow

green

black Respuesta correcta

Pregunta 59 Informe