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Frage 1 Bericht
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.
Frage 4 Bericht
Radio receivers are tuned using
Frage 6 Bericht
Calculate the peak voltage that could be obtained from a 220 V\(_{r.m.s}\)main supply.
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Frage 7 Bericht
When some ice cubes are added to a glass of warm water, the glass is cooled by a process of
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Frage 8 Bericht
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
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Frage 9 Bericht
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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Frage 10 Bericht
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
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Frage 12 Bericht
Which of the following will reduce the frequency of oscillation of a simple pendulum?
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Frage 13 Bericht
In which of the following is the expansion of solids a disadvantage?
Frage 14 Bericht
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
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Frage 15 Bericht
A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.
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Frage 16 Bericht
Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will
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Frage 17 Bericht
The most suitable instrument for measuring the diameter of a thin wire is a
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Frage 19 Bericht
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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Frage 20 Bericht
The mercury column in a simple mercury barometer is of height 5m above the mercury in a reservoir. If the tube is replaced with one whose radius is twice that of the first tube, what will be the height of the mercury column in the new tube?
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Frage 21 Bericht
Which of the following pairs is an example of translucent bodies?
Frage 22 Bericht
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)
Frage 24 Bericht
The motion of the wheel of a bicycle moving on a smooth straight road is
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Frage 25 Bericht
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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Frage 26 Bericht
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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Frage 28 Bericht
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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Frage 29 Bericht
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?
Frage 31 Bericht
The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?
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Frage 36 Bericht
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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Frage 37 Bericht
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.
Frage 38 Bericht
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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Frage 39 Bericht
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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Frage 40 Bericht
The wave theory of light does not explain photoelectricity because
Frage 43 Bericht
A stone of mass 0.7 kg is projected vertically upward with a speed of 5 ms-1. Calculate the maximum height reached. [g =10ms-2]
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Frage 44 Bericht
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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Frage 45 Bericht
Which of the statements is/are true of two bodies involved in an inelastic collision? After collision.
I. the kinetic energy increases
II. The momentum decreases
III. Their velocities are the same.
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Frage 46 Bericht
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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Frage 47 Bericht
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.
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