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Tambaya 2 Rahoto
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)
Tambaya 3 Rahoto
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?
Tambaya 4 Rahoto
491 K is equivalent to
Tambaya 7 Rahoto
The motion of the wheel of a bicycle moving on a smooth straight road is
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Tambaya 9 Rahoto
A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.
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Tambaya 12 Rahoto
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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Tambaya 13 Rahoto
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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Tambaya 14 Rahoto
Which of the following is a desirable property of a fuse Wire?
Tambaya 16 Rahoto
Which of the following will reduce the frequency of oscillation of a simple pendulum?
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Tambaya 18 Rahoto
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.
Tambaya 22 Rahoto
In which of the following is the expansion of solids a disadvantage?
Tambaya 24 Rahoto
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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Tambaya 25 Rahoto
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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Tambaya 26 Rahoto
An electric motor primary converts
Tambaya 27 Rahoto
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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Tambaya 28 Rahoto
When some ice cubes are added to a glass of warm water, the glass is cooled by a process of
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Tambaya 29 Rahoto
The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?
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Tambaya 30 Rahoto
Radio receivers are tuned using
Tambaya 31 Rahoto
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.
Tambaya 32 Rahoto
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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Tambaya 33 Rahoto
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.
Tambaya 34 Rahoto
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
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Tambaya 35 Rahoto
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.
Tambaya 37 Rahoto
Which of the following is a non-renewable energy source?
Tambaya 39 Rahoto
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
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Tambaya 40 Rahoto
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
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Tambaya 42 Rahoto
Which of the following pairs is an example of translucent bodies?
Tambaya 43 Rahoto
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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Tambaya 44 Rahoto
The wave theory of light does not explain photoelectricity because
Tambaya 45 Rahoto
Which of the following statements is correct?
Tambaya 46 Rahoto
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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Tambaya 47 Rahoto
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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