NECO SSCE - Physics - 2009

Arrange the following in the order of their increasing frequency.

I. Visible light
II. Gamma rays
III. Radio waves
IV. Infra-red radiation
V. Ultra-violet radiation

A transformer has an efficiency of 92.5%. the ratio number of turns in the primary coil to that in the secondary coil is 128 : 45. If the current passing through the secondary coil is 9.0A, calculate the current passing through the primary-coil.

The gravitational field intensity at a location X, in space, is two-fifths of its value on the earth’s surface. If the weight of an object at X is 4.80N. what is its weight on the earth?

The term torque means

An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330ms^-1]

A sound wave from a ship is received 8.4s later. What is the depth of the sea? [Speed of sound in water 1500ms^-1]

The phenomenon of photoelectric effect is used in the following EXCEPT

Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg^-1 . Specific heat capacity of water 4.2Jg^-1 K^-1]

Which of the following statements is correct about light and sound waves? Both

Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then

The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by

Which of the following substances undergoes sublimation?

A stone is thrown with a speed of 10ms at an angle of 30° to the horizontal, Calculate its time of flight, (g = 10ms²)

Inertia is the property of a body which makes the body to

A ball of mass 100g falls from a height of 5m onto a concrete floor and rebounds to a height of 3m. Calculate the energy lost. (g = 10ms^-2)

An object of mass 2kg moves for 5s with a uniform velocity of 10ms. What is the magnitude of its acceleration in ms^-2
?

A ball of mass 0.1kg moving with velocity of 20ms-1 is hit by a force which acts on it for 0.02s. If the ball moves off in the opposite direction with a velocity of 25ms-1 , calculate the magnitude of the force.

Which of the following pairs of phenomena helps in the resolution of the wave-particle paradox of matter?

An immersion heater is rated 1500W. How long does it take the heater to raise the temperature of 1 kg of water by 30°C? (Assume heat lost to the surrounding is negligible, Specific heat capacity of water 4200Jkg^-1K^-1)

A plane progressive wave is represented by the equation y = 0.2sin (200πt - 0.5.x) where x and y are measured in cm and t in s. What is the frequency of the wave?

Two images Y and X are formed by a plane mirror and a convex mirror respectively. Which of the following is correct about their characteristics?

Which of the following statements about a gas is NOT correct?

The electric potential at a distance d from a point charge q in air of permittivity eo is expressed as?

Which of the following statements about water is NOT correct?

In which of the following fields is repulsion NOT experienced?

In the electrical method of making a magnet, the polar the magnet formed depends on the

A body executing simple harmonic motion has an angular speed of 2π radians. Its period of oscillation is (π 3.14).

A body accelerating will have a constant speed if it is

Determine the value of x from the nuclear reaction below,

\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + 2β + energy

An effort P applied at one end of a crowbar just overcomes the resistance W at the lid of a tin. The mechanical advantage of the crowbar is expressed as

Which of the following cells does not require a dipolar for effective and efficient delivery of current?

Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane?

Which of the following statements is correct about volatile liquids? They have

Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is

The work done in extending a spring by 40 mm is 1.52J. Calculate the elastic constant of the spring.

Which of the following phenomena is responsible for the spherical shape of soap bubbles?

Which of the following statements about the pressure in a liquid is NOT correct? It

The equation P^xV^yT^z = Constant is Charles’ law if

A projectile attains its maximum height when the angle of projection is

Which of the following pairs of musical instruments produce sound due to the vibration of air column?

The defect of the eye lens which occurs as a result of weak ciliary muscles is called

When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quart its e.m.f. The cell’s internal resistance in terms of R is

A series RLC circuit is said to resonate, when

Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V.

Two forces of magnitude 8N and 4N act at right angle to each other. The angle between the resultant and the 8N force is