NECO SSCE - Physics - 2004

A radioactive isotope has a half-life of 8 days. What fraction of the atoms will remain after 72 days?

Which to the following is NOT a fundamental unit?

Which of the following is used as a depolarizer in a Denial cell?

Calculate the energy stored in an inductor of inductance 0.5H when a current of 3A flows through it.

What is the uncertainty in the measurement of time, if the uncertainty in measuring the energy of an electron of mass 10^-30 kg is 2.45 × 10^-19J? h = 6.6 × 10^-34

The component of a vector in a given direction is

The temperature at which the water vapour present in the air is just enough to saturate the air is the _______ point.

Heat

I. is a form of energy
II. is measured with a thermometer
III. cannot be created or destroyed
IV. from a hot object is transferred through conduction only. Which of the statements above are correct?

In which of these fields are repulsive forces NOT experienced?

I. Magnetic field
II. Gravitational field
III. Electric field

Which of the following statements is true of nuclear fission?

A current flows in a series circuit containing a resistor, R, an inductor, L and a capacitor, C. Which of the following is true of the power dissipated in the circuit component(s)?

Calculate the magnitude of the electric field intensity in vacuum at a distance of 25cm from a charge of 5 × 10^-3C. [Take 1/4πε₀]

A stone is dropped from the top of a tower of height 11 .25m. Calculate the time it will take to reach the ground. [g = 10ms-2]

In which of the following are crystalline structures observable?

I. Gas
II. Liquid
III. Solid

A voltage supply of 12V r.m.s. and frequency 90Hz is connected to a 4 ω resistor. Calculate the peak value of the current

Which property of a fluid determines its suitability as a lubricant?

The rate of diffusion of gases increases with increase(s) in

I. density
II. temperature
III, mass. Which is/are correct?

A resistor connected in parallel with a galvanometer so that a large amount of current can be measured is called a/an

A body has masses of 0.013kg and 0.012 kg in oil and water respectively. If the relative density of oil is 0.875 calculate the mass of the body.

An electron makes a transition from - 1.60 eV energy level to - 10.4eV energy level Calculate the energy loss due to the transition.

For total internal reflection to occur,

I. light must be travelling from an optically more dense to an optically less dense medium.
II. the angle of incidence in the denser medium must be greater than its critical angle.
III. the angle of refraction in the less dense medium must be equal to 90 °. Which of the statements above is/are correct?

Which of these expresses the relationship between the earth’s magnetic field FE, and the field’ FB due to a magnet at neutral points? FE is

When the same amount of current, I is passed through different wires under the same conditions, the rates of production of heat are

The relative density of dilute tetraoxosulphate (vi) acid in a battery is measured with a

A mass of 5kg is suspended from the ceiling of a lift with a light inextensible string. As the lift moves upwards with an acceleration of 2ms^-2, the tension in the string is [g = 10ms^-2]

If the distance between the plates of a parallel plate capacitor is decreased, its capacitance

A force F is applied to a body P as shown in the diagram above. If the body moves through a distance, a, which of the following represents the work done?

A car travels with a constant velocity of 45 kmh^-1 for 20s. What distance does it cover in this time?

How far from a hill should a boy stand to hear the echo of his clap 1 .6s later? [Speed of sound in air is 340ms^-1]

A projectile fired with initial velocity, u will attain its maximum height H when the angle of projection θ is

Emission spectra are caused by

Calculate the wavelength of light travelling with a speed of 3 × 108ms^-1 and a frequency of 6.2 × 10¹⁴Hz.

When very hot water is poured into a thin-walled glass container, it is less likely to break because

A surface in the path of an advancing wave on which all the particles are in the same state of disturbance is called a

Which of the following conclusion(s) can be drawn from Newton’s second law of motion? Force is proportional to

I. the product of mass and acceleration
II. the product of mass and velocity
III. Impulse

Which of the statements about prism binoculars is/are correct? They

I. are a pair of two telescopes mounted side by side
II. reduce the optical path of the light ray from the objective to the eye piece
III, present inverted and diminished image to the viewer
IV. present erect and magnified image to the viewer.

A plane which is Inclined at an angle of 30 ° to the horizontal has a velocity ratio of

A body of mass 40g loses 80J of heat energy. If the specific heat capacity of the body is 400 Jkg^-1, calculate the change in temperature of the body.

A note, A from a guitar produces a wave of amplitude 4 mm and frequency 1000 Hz. Another note, B from a whistle produces a similar waveform of amplitude 2 mm and frequency 2200 Hz. If the two notes are compared,

The frequency of a body executing simple harmonic motion when left undisturbed is known as__________ frequency.

Which of the following is NOT an example of a percussion instrument?

A ray of light experiences a minimum deviation when passing through an equilateral triangular glass prism. Calculate the angle of incidence of the ray. [Refractive index of glass = 1.5]

The resultant of two forces P and Q is least when the angle between them is

The general equation of a wave CANNOT be written as

The time t₁, t₂ and t₃ for 20 complete oscillations of a simple pendulum experiment are 32.0s, 34.6s and 35.5s respectively. Calculate the mean period of the pendulum.