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Ibeere 5 Ìròyìn
Calculate the magnitude of the force due to a magnetic field of 0.40T on an electron moving perpendicular to the field with a speed of 4.00 × 106ms-1 (e 1.60 × 10-19C]
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Ibeere 6 Ìròyìn
Which of the following will reduce the frequency of oscillation of a simple pendulum?
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Ibeere 7 Ìròyìn
A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is
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Ibeere 9 Ìròyìn
An object of mass 5.0 cg moving with a velocity of 12ms-1 due north hits a stationary body of mass 7.0kg. If they stick together after collision and move with velocity V due north, calculate the magnitude of V.
Ibeere 12 Ìròyìn
Radio receivers are tuned using
Ibeere 14 Ìròyìn
A constant force acts on a body of mass 50kg and changes its speed from 20ms-1 to 90ms-1 in 10 seconds. Calculate the magnitude of the force applied.
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Ibeere 16 Ìròyìn
An object is placed in front of a concave mirror whose radius of curvature is 12cm. If the magnification of the Image produced is 1.5, how far is the object from the mirror?
Ibeere 17 Ìròyìn
In which of the following is the expansion of solids a disadvantage?
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Ibeere 18 Ìròyìn
The motion of the wheel of a bicycle moving on a smooth straight road is
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Ibeere 19 Ìròyìn
An atom radiates 1.5 × 10-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0-34Js ; Speed of light in vacuum = 3.0 × 108ms-1)
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Ibeere 20 Ìròyìn
Which of the following is used for shielding radioactive fallout?
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Ibeere 22 Ìròyìn
The escape velocity of an object from the gravitational field of a planet
I. Increases with the mass of the object
II. Increases with the mass of the planet
III. Is smaller on the moon than on the earth. Which of the above statements is/are correct?
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Ibeere 23 Ìròyìn
Notes of the same frequency sounded on a guitar and trumpet may differ in
I. loudness
II. Pitch
III. quality Which of the statements above is correct?
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Ibeere 25 Ìròyìn
A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.
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Ibeere 26 Ìròyìn
A voltage of 240V is connected to the primary coil of a the rating of the primary turns to the secondary turns if the voltage available at the secondary coil is 15V
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Ibeere 29 Ìròyìn
A projectile is projected with an initial velocity u, at an angle θ to the horizontal. The maximum height attained is.
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Ibeere 30 Ìròyìn
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
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Ibeere 31 Ìròyìn
The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?
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Ibeere 32 Ìròyìn
Which of the following is/are longitudinal wave(s)?
I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string
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Ibeere 33 Ìròyìn
Which of the following statements is/are correct in any machine?
I. The velocity ratio is usually greater than the mechanical advantage.
II. Efficiency work inputwork outputIII. The velocity ratio is independent of friction.
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Ibeere 34 Ìròyìn
Two metals A and B lose the same quantity of heat when their temperatures drop from 20°C to 15°C. If the specific heat Capacity of A Ii thrice that of B, calculate the ratio of the mass of A to that of B.
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Ibeere 35 Ìròyìn
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
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Ibeere 38 Ìròyìn
The wave theory of light does not explain photoelectricity because
Ibeere 39 Ìròyìn
When some ice cubes are added to a glass of warm water, the glass is cooled by a process of
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Ibeere 40 Ìròyìn
A radio station broadcasts at a frequency of 400KHz. If the speed of the wave is 3.0 ×10-8 ms-1, calculate the wavelength of the radio wave.
Ibeere 43 Ìròyìn
A body moves along a circular path with uniform angular speed of 0.6 rad s-1 and at a constant speed of 3.0 ms-1.
Calculate the acceleration of the body towards the centre of the circle.
Ibeere 44 Ìròyìn
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
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