1997 WAEC SSCE Physics Past Questions

1997

What is the frequency of a radio wave of wavelength 150m if the velocity of radio waves in free space is 3 x \(10^8ms^{-1}\)?

1997

A cup containing 100g of pure water at 20°C is placed in a refrigerator. If the refrigerator extracts heat at a rate of 840J per minute, calculate the time taken for the water to freeze. Neglect the heat capacity of the…

1997

A converging lens of focal length 15cm is used to obtain a real image magnified \(1\frac{1}{2}\) times. Calculate the distance of the image from the lens?

1997

The odor of a leaking gas is perceived at a distance from the source. This is made possible by the process of

1997

The half-life of a radioactive material is 6hrs. What quantity of 1kg of the material would decay in 24 hours?

1997

When a paint brush is removed from clean water, the bristles of the brush are pulled together because of

1997

Which of the following statements is not true of nuclear fission?

1997

The ratio of tensile stress to tensile strain is known as

1997

Two identical waves traveling in the same direction are superimposed. What should be the phase difference between the waves for maximum destructive interference to occur?

1997

In a photocell, light energy is converted to

1997

The current in the primary coil of a transformer is 2.5A. If the coil has 50 turns and the secondary250 turns, calculate the current in the secondary coil. Neglect energy losses in the transformer

1997

The relationship between the directions of magnetic field, the current-carrying wire in the field is easily remembered using

1997

Lenz’s law of electromagnetic induction is essentially a statement of the

1997

An alternating current with a peak value of 5A passes through a resistor of resistance 10Ω. Calculate the rate at which energy is dissipated in the resistor

1997

A progressive wave has a wavelength of 50cm. calculate the phase difference between two points at a distance of 20cm apart.

1997

Which of the following statements is not correct?

1997

A pipe open at both ends, produces a fundamental note. If the velocity of sound in air is V and L the length of the pipe, which of the following expresses the frequency of the note? Neglect end correction

1997

When a resistor of resistance R is connected across a cell, the terminal p.d of the cell is reduced to three quarters of its e.m.f. The internal resistance of the cell is expressed as

1997

The current in a series R-L-C circuit attains its maximum value when the

1997

The magnification produced with a converging lens is 5. If the object is a square wire gauze of side 2cm, calculate the area of the image

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