NECO SSCE - Physics - 2009

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

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

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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.

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

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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?

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

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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)

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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?

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

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

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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]

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

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

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

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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)

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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.

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The term torque means

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Which of the following statements about water is NOT correct?

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

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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

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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

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In which of the following fields is repulsion NOT experienced?

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

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Which of the following substances undergoes sublimation?

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A series RLC circuit is said to resonate, when

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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?

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

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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]

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

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The phenomenon of photoelectric effect is used in the following EXCEPT

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

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

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

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A body accelerating will have a constant speed if it is

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

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

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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]

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Determine the value of x from the nuclear reaction below,

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

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

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

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

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

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

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

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

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