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Swali 3 Ripoti
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.
Swali 4 Ripoti
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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Swali 5 Ripoti
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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Swali 6 Ripoti
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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Swali 9 Ripoti
The most suitable instrument for measuring the diameter of a thin wire is a
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Swali 10 Ripoti
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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Swali 11 Ripoti
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.
Swali 12 Ripoti
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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Swali 15 Ripoti
Which of the following will reduce the frequency of oscillation of a simple pendulum?
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Swali 16 Ripoti
Radio receivers are tuned using
Swali 17 Ripoti
The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?
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Swali 18 Ripoti
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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Swali 19 Ripoti
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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Swali 20 Ripoti
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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Swali 21 Ripoti
The motion of the wheel of a bicycle moving on a smooth straight road is
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Swali 23 Ripoti
In which of the following is the expansion of solids a disadvantage?
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Swali 25 Ripoti
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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Swali 26 Ripoti
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
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Swali 27 Ripoti
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
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Swali 30 Ripoti
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.
Swali 32 Ripoti
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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Swali 33 Ripoti
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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Swali 34 Ripoti
When some ice cubes are added to a glass of warm water, the glass is cooled by a process of
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Swali 36 Ripoti
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
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Swali 38 Ripoti
The wave theory of light does not explain photoelectricity because
Swali 39 Ripoti
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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Swali 40 Ripoti
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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Swali 41 Ripoti
A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.
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Swali 44 Ripoti
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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Swali 45 Ripoti
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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Swali 46 Ripoti
Calculate the peak voltage that could be obtained from a 220 V\(_{r.m.s}\)main supply.
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Swali 47 Ripoti
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?
Je, ungependa kuendelea na hatua hii?