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Question 2 Report
Determine the value of x from the nuclear reaction below,
\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + 2β + energy
Question 5 Report
The defect of the eye lens which occurs as a result of weak ciliary muscles is called
Question 6 Report
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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Question 7 Report
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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Question 8 Report
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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Question 9 Report
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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Question 10 Report
Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V.
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Question 11 Report
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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Question 13 Report
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)
Question 14 Report
Inertia is the property of a body which makes the body to
Question 15 Report
The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by
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Question 16 Report
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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Question 17 Report
The work done in extending a spring by 40 mm is 1.52J. Calculate the elastic constant of the spring.
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Question 18 Report
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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Question 19 Report
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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Question 20 Report
Which of the following statements is correct about volatile liquids? They have
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Question 21 Report
Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is
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Question 22 Report
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
Question 24 Report
Which of the following pairs of musical instruments produce sound due to the vibration of air column?
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Question 25 Report
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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Question 26 Report
Which of the following substances undergoes sublimation?
Question 27 Report
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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Question 28 Report
Which of the following cells does not require a dipolar for effective and efficient delivery of current?
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Question 29 Report
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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Question 30 Report
Which of the following statements is correct about light and sound waves? Both
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Question 31 Report
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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Question 32 Report
In the electrical method of making a magnet, the polar the magnet formed depends on the
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Question 34 Report
The electric potential at a distance d from a point charge q in air of permittivity eo is expressed as?
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Question 35 Report
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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Question 36 Report
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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Question 37 Report
Which of the following statements about the pressure in a liquid is NOT correct? It
Question 38 Report
The phenomenon of photoelectric effect is used in the following EXCEPT
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Question 39 Report
A projectile attains its maximum height when the angle of projection is
Question 40 Report
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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Question 41 Report
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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Question 42 Report
Which of the following phenomena is responsible for the spherical shape of soap bubbles?
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Question 44 Report
Which of the following pairs of phenomena helps in the resolution of the wave-particle paradox of matter?
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Question 45 Report
Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane?
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