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Pregunta 1 Informe
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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Pregunta 2 Informe
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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Pregunta 4 Informe
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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Pregunta 5 Informe
Which of the following is used for shielding radioactive fallout?
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Pregunta 6 Informe
The most suitable instrument for measuring the diameter of a thin wire is a
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Pregunta 8 Informe
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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Pregunta 9 Informe
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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Pregunta 10 Informe
Which of the following is NOT a component of an a.c. generator?
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Pregunta 11 Informe
Which of the following radiations has the shortest wavelength?
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Pregunta 12 Informe
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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Pregunta 13 Informe
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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Pregunta 14 Informe
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
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Pregunta 16 Informe
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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Pregunta 17 Informe
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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Pregunta 18 Informe
Calculate the peak voltage that could be obtained from a 220 V\(_{r.m.s}\)main supply.
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Pregunta 19 Informe
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.
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Pregunta 21 Informe
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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Pregunta 22 Informe
Which of the following will reduce the frequency of oscillation of a simple pendulum?
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Pregunta 23 Informe
A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.
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Pregunta 24 Informe
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
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Pregunta 25 Informe
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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Pregunta 28 Informe
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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Pregunta 29 Informe
The motion of the wheel of a bicycle moving on a smooth straight road is
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Pregunta 31 Informe
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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Pregunta 32 Informe
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?
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Pregunta 33 Informe
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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Pregunta 34 Informe
Which of the following is a desirable property of a fuse Wire?
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Pregunta 35 Informe
When a yellow card is viewed in blue light, It will appear
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Pregunta 36 Informe
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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Pregunta 37 Informe
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
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Pregunta 38 Informe
The wave theory of light does not explain photoelectricity because
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Pregunta 39 Informe
Which of the following is NOT a component of a slide projector?
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Pregunta 40 Informe
The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?
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Pregunta 41 Informe
Which of the following pairs is an example of translucent bodies?
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Pregunta 42 Informe
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.
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Pregunta 43 Informe
In which of the following is the expansion of solids a disadvantage?
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Pregunta 44 Informe
Which of the following is a non-renewable energy source?
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Pregunta 45 Informe
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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Pregunta 47 Informe
When some ice cubes are added to a glass of warm water, the glass is cooled by a process of
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