The inside of a vacuum flask is usually coated with silver to reduce heat loss by
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2009
Determine the value of x from the nuclear reaction below:\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + 2β + energy
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2009
Which of the following substances undergoes sublimation?
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2009
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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2009
The defect of the eye lens which occurs as a result of weak ciliary muscles is called
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2009
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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2009
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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2009
In which of the following fields is repulsion NOT experienced?
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2009
Which of the following statements about the pressure in a liquid is NOT correct? It
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2009
A projectile attains its maximum height when the angle of projection is
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2009
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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2009
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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2009
Which of the following phenomena is responsible for the spherical shape of soap bubbles?
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2009
Which of the following pairs of phenomena helps in the resolution of the wave-particle paradox of matter?
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2009
In the electrical method of making a magnet, the polar the magnet formed depends on the
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2009
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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2009
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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2009
Inertia is the property of a body which makes the body to
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2009
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…
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2009
Which of the following statements is correct about volatile liquids? They have