Loading....
|
Press & Hold to Drag Around |
|||
|
Click Here to Close |
|||
Question 5 Report
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)
Question 7 Report
The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?
Answer Details
Question 8 Report
A projectile is projected with an initial velocity u, at an angle θ to the horizontal. The maximum height attained is.
Answer Details
Question 9 Report
Radio receivers are tuned using
Question 10 Report
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]
Answer Details
Question 11 Report
In which of the following is the expansion of solids a disadvantage?
Question 12 Report
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.
Answer Details
Question 13 Report
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]
Answer Details
Question 14 Report
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
Answer Details
Question 17 Report
Which of the following will reduce the frequency of oscillation of a simple pendulum?
Answer Details
Question 18 Report
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.
Question 19 Report
When some ice cubes are added to a glass of warm water, the glass is cooled by a process of
Answer Details
Question 20 Report
The motion of the wheel of a bicycle moving on a smooth straight road is
Answer Details
Question 21 Report
The wave theory of light does not explain photoelectricity because
Question 22 Report
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
Answer Details
Question 23 Report
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.
Question 24 Report
Calculate the peak voltage that could be obtained from a 220 V\(_{r.m.s}\)main supply.
Answer Details
Question 25 Report
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.
Answer Details
Question 26 Report
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?
Question 27 Report
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
Answer Details
Question 29 Report
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?
Answer Details
Question 30 Report
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
Answer Details
Question 31 Report
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?
Answer Details
Question 32 Report
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?
Answer Details
Question 33 Report
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
Answer Details
Question 35 Report
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
Answer Details
Question 37 Report
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.
Answer Details
Question 38 Report
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.
Question 39 Report
Which of the following pairs is an example of translucent bodies?
Question 42 Report
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
Answer Details
Question 43 Report
The most suitable instrument for measuring the diameter of a thin wire is a
Answer Details
Question 44 Report
A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.
Answer Details
Question 45 Report
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.
Answer Details
Would you like to proceed with this action?