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2010 - WAEC Physics Past Questions and Answers - page 2

11

simple harmonic oscillator has a period of 0.02s and amplitude of 0.25m. Calculate the speed in ms-1 at the centre of the oscillation

A
125\(\pi\)
B
25.00\(\pi\)
C
100.00 \(\pi\)
D
400.00\(\pi\)
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12

A vertical string, suspended from a fixed point and having a small mass attached to the free end is set into oscillations. Which of the following statements about the system are correct? i. The potential energy of the mass is a minimum at the middle of the swing ii. Its kinetic energy is a maximum at the middle of the swing iii. The sum of the potential and kinetic energies is constant throughout the swing

A
i,ii and iii
B
i and ii only
C
ii and iii only
D
i and iii only
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13

A moving body of mass 25.0kg undergoes a uniform retardation of 20.0ms-2. Calculate the magnitude of the retardating force

A
1.25N
B
8.00N
C
45.00N
D
500.00N
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14

Which of the following sources of energy is/are exhausible? i. Solar ii. Fossil fuels iii. Tidal power

A
i, ii and iii
B
i and ii only
C
i and iii only
D
ii and iii only
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15

a machine is said to be a third class lever when the

A
load is between the fulcrum and effort
B
fulcrum is between the effort and the load
C
effort is between the fulcrum and load
D
fulcrum is directly below the load
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16

a thermometer records 680 mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380 mmHg is

A
-25oC
B
-20oC
C
20oC
D
25oC
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17

The advantages of the thermoelectric thermometer include the following characteristics except that it

A
can measure rapidly changing temperatures
B
can measure high and low temperature
C
can measure high and low temperature almost at a point
D
is fairly sensitive
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18

In a thermos flask, heat loss by radiation is minimizes by the

A
silvered surfaces
B
vacuum within the doubled walls
C
plastic stopper
D
cork support
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19

The pressure P, volume V, and absolute temperature T of a given mass of an ideal gas change simultaneously. Which of the followng equations is correct about the gas?

A
PV = \(\frac{constant}{T}\)
B
\(\frac{P}{T} = Constant\)
C
\(\frac{P}{V} = \frac{constant}{T}\)
D
\(\frac{I}{T} = \frac{constant}{PV}\)
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20

Specific heat capacity 36.4 Jkg-1 K-1 of a body means that when 36.4J of heat energy is supplied to a body of

A
mass 100kg the temperature rises by 1k
B
mass 1kg, the temperature by 1000K
C
mass 1kg, the temperature rises by 1K
D
mass 100kg, the temperature rises by 1000k
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