The maximum displacement of a vibrating tuning fork is its
Which of the following waves is not transverse?
Light traveling through a small pinhole usually does not make a shadow with a distinct sharp edge because of
The angle of incidence of a ray of light on a plane mirror is 55o. Determine the angle between the reflected ray and mirror.
A concave mirror forms a magnified and erect image only when the objects is placed
at the center of curvature
at the focus
between the focus and the pole of the mirror
beyond the radius of curvature
A thin lens is placed 50 cm from an illuminated object. The image produced has a linear magnification of ¼. Calculate the power of the lens in dioptres.
25 .0 D
Which of the following characteristics of light determines its colour?
Which of the following is not part of the electromagnetic spectrum?
Sound interference is necessary to produce the phenomenon of
Light is considered as a traverse wave because it travels
through material without causing disturbance of the medium
through space with constant speed
in a direction parallel to the plane containing the electric and magnetic fields
in a directional perpendicular to the plane containing the electric and magnetic fields
The diagram above illustrates the sun, moon and earth in the same straight line during an eclipse. An observer at the point P on earth observes
In the day time, it is possible to see under shady areas such as under a tree, because light has undergone
The distance between a concave mirror and an object placed in front of it is 1.0m. If the radius of curvature f the mirror is 4.0m, the image formed will be
2.00m behind the mirrow
2.00m in front of the mirror
1.25m in front of the mirror
1.25 behind the mirror
The image formed by a concave mirror is
real, erect and enlarged
real, inverted and enlarged
virtual, erect and diminished
virtual, erect and enlarged
When viewed straight down, a fish in a pond is
farther below than it appears to be
nearer than it appears to be
found at exactly the same point it is seen
seen beside its image
A converging lens and a screen are placed 20cm and 80cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high, calculate the height of the image formed
Which of the following defects of vision is as a result of the eye ball being too long ?
Loss of accomodation
A sound wave is produced from a source and an echo is heard t seconds afterwards. If d is the distance of the reflecting surface from the source v, the speed ζ, the wavelength and ì the period of the wave, then
d = 2t/ζ
d = ζt/2T
d= ζ T/2t
Which of the following waves is electromagnetic?
X - rays
The distance between two points P and Q, along a wave is 0.05m. If the wave length of the wave is 0.10m, determine the phase angle between P and Q in radians
Which of the following phenomena is not a direct consequence of rectilinear propagation of light?
Lunar and solar eclipses
Images of objects in a pinhole camera
Diffraction of light
Shadows of opaque objects
An object is placed 10cm in front of a plane mirror. If it is moved 8cm farther away from the mirror, determine the distance of the final image from the mirror
In which of the following pieces of apparatus is the radius of curvature equal to twice the focal length?
When an object is placed at the centre of curvature of a concave mirror, its image is formed at
the center of curvature
a distance twice the radius of curvature
A rectangular glass prism of thickness d and absolute retractive index n is placed on a point object, which is viewed vertically downward from above the prism. Which of the following expressions correctly defines the apparent upward displacement of the object
Which of the following factors can affect the speed of sound in air?
I. The temperature of the surrounding
II. The direction of wind
III. The pitch of the sound
I and II only
II and III only
I and III only
I, II and III
A sounding tuning fork is brought near the open end of a pipe containing air and the loudness of the sound is observed to increase. This observation is due to
Which of the following statements about sound waves is not correct? Sound waves can be
Which of the following statements is correct about resonance? Resonance occurs when a body
vibrates with its natural natural frequency
is forced to vibrate at its own natural frequency by another body vibrating at the same frequency
vibrates at the frequency of the body causing the vibration
vibrates with an irregular frequency
The S.I units of frequency, period and amplitude of a wave are respectively
hertz, second and centimeter
second, metre and hertz
metre, hertz and second
hertz, second and metre
A note of frequency 2000Hz has a velocity of 400 ms-1 . Calculate the wavelength of the note
The eclipse of the moon occurs when the
moon comes exactly between the earth and the sun
earth comes exactly between the moon and the sun
sun comes exactly between the earth and the moon
moon reflects all the rays from the sun onto the earth
Which of the following observations cannot be explained using the rectilinear propagation of light?
Production of images by a pinhole camera
Production of real images of objects by lenses
Formation of an annular eclipse
Diffraction patterns of light
The distance between the sucessive crests of a wave travelling at 20 ms-1 is 25 cm. Calculate the frequency of the wave
A ray from a fixed object is incident on a plane mirrow at an angle of 20o . If the mirrow is rotated through 30o , by how many degrees would the reflected ray rotate?
Which of the following distances is usually adjustable in the camera? The distance between the
lens the film
diaphragm and the shutter
shutter and the film
diaphragm and the film
A traveling microscope is focused on a mark on a table. If a glass block of thickness 18.0 cm is placed on the mark, by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass =1.5]
In which of the following media would sound wave travel fastest?
Which of the following actions is necessary in order to tune a string to produce a note of an octave higher than its fundamental?
Doubling the length of the string
Reducing the tension by half
Reducing the mass per unit length
Increasing the tension four times
Which of the following statements about progressive mechanical wave is correct?
it can be plane-polarised
its energy is localised at specific points of its profile
It does not require a material medium for its propagation
its frequency remains constant as it travels between different media
The distance between two points in phase on a progressive wave is 5cm. If the speed of the wave is 0.20ms-1 , calculate its period .
Radio waves travel in air at 3.0 x 108 ms-1. If the waves enter water of refractive index 4/3, calculate the speed of radio waves in water
4.33 x 108 ms-1
4.00 x 108 ms-1
2.25 x 108 ms-1
1.33 x 108 ms-1
The amplitude of a wave is the
distance travelled by the wave in a complete cycle of its motion
maximum displacement of the wave particle from the equlibrium position
separation of two adjacent particles vibrating in a phrase
distance between two sucessive troughs of the wave
Which of the following optical instruments does not depend on the use of plane mirrors?
A ray of light is incident normally on a plane mirrow. If the incident ray is kept fixed while the mirrow iss rotated through an angle of 30o , determine the initial and final angles of reflection respectively.
0o and 60o
90o and 30o
0o and 30o
90o and 60o
In which of the following media is the transmission of sound waves faster?
The basic difference between a transverse wave and a longitudinal wave travelling in the same direction in a medium is in the
amplitude of the waves
wavelength of the waves
direction of vibration of the particles of the medium
period of vibration of the particles of the medium
A wave traveling from water to glass suffers a change in its speed at athe common boundary. Which of the following properties explains thie observation?
The image of an optical pin placed at the principal focus of a concave mirrow will be formed
between the principal focus and the pole
at the centre of curvature
between the principal focus and the centre of curvature
A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m, calculate the height of the image of the man produced by the camera
A magnified and virtual image of a near object is produced by
During a thunderstorm, lightning and thunder occurred simutaneously in the atmosphere. An observer on the earth's surface sees the lighning flash shortly before hearing the thunder. This is because the
atmospheric pressure is higher at the surface than at the higher altitudes
speed of sound is less than that of light
temperature of the atmosphere decreases with altitude
atmospheric density decreases with altitude
A girl stands 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms-1 , how long would it take for her to hear the echo of the sound?
Which of the following reasons explains why the walls and ceillings of a standard concert hall are usually covered with perforated pads? To
increasese the intensity of sound waves
increase the loudness of the sound waves
reduce the effect of reverberation of sound waves
decrease the frequency of sound waves
The sound from a vibrating turning fork is louder when the tip of its stem is placed on a wooden table than when in air because
the friction between the table and the turning fork generates additional energy.
air molecules absorb sound waves but wood transmits sound waves
the table increases the frequency of the turning fork
a larger mass of air is set into vibration by the table
Which of the following conditions is necessary for the occurence of total internal reflection of light?
Light must travel from an optically less dense to a denser medium
The angle of incidence must be equal to the critical angle
The angle of incidence must be greater than the critical angle
The angle of refraction must be 90oC
An object is placed on the principal axis and at the center of curvature of a concave mirror, the image of the object formed by the mirrow is
real and magnified
real and inverted
erect and magnified
erect and virtual
A converging lens produces an image four times as focal lenght
The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir.
A converging lens has a focal length of 5cm. Determine its power.