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Quiz 15
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Q.1
The device used for measuring the wavelength of X-rays is
G.M. Counter
Cyclotron
Bragg Spectrometer
Mass Spectrometer
Q.2
Who discovered X-ray?
Marie Curie
Pierre Curie
Wilhelm Roentgen
Ernest Rutherford
Q.3
Which of the following has the longest wavelength?
Infrared radiation
X-ray radiation
Ultraviolet radiation
Visible radiation
Q.4
Energy of Ultraviolet rays is great than
Infrared rays
Gamma rays
X-rays
Cosmic rays
Q.5
In a vacuum, all electromagnetic waves have the same
Velocity
Wavelenth
Frequency
All the above
Q.6
If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?
LUV < lIR < lVIS
LUV > lVIS > lIR
LUV > lIR > lVIS
LUV < lVIS < lIR
Q.7
Which of the following has the lowest frequency?
Visible light
Gamma rays
Xrays
Ultra violet rays
Q.8
Night photography and photopraphy in mist and fog are possible using
Ultra-violet radiation
Infra-red radiation
Microwave radiation
Gamma radiation
Q.9
Transition ions absorb light in :
Infrared region
Ultraviolet region
Microwave region
Visible region
Q.10
Fibre optics work on the principle of
Scattering of light
Total internal absorption
Total internal reflection
Optical rotation
Q.11
Rainbow is seen after rain because of hanging molecules of water which act as
Lenses
Mirrors
Prisms
Slabs
Q.12
Lens is made up of which glass
Ordinary glass
Pyrex glass
Flint glass
Cobalt glass
Q.13
What is colour of light related to ?
Amplitude
Frequency
Quality
Velocity
Q.14
The redness in atmosphere at Sunrise and Sunset is due to :
Refraction of light
Reflection of light
Dispersion of light
Scattering of light
Q.15
The information of brilliant colors in a thin soap film is a consequence of the phenomena of
Polarization and interference
Diffraction and dispersion
Multiple refraction and dispersion
Multiple reflection and interference
Q.16
Optic fibres are used in :
CAT scans
X-ray photos
Ultrasound scans
Endoscopy
Q.17
The final image in a simple microscope is
Real, diminished and inverted
Real, magnified and erect
Virtual, magnified and erect
Virtual, diminished and erect
Q.18
Which microscope is often used to view metal surfaces?
Optical microscopes
Scanning tunneling microscopes
Electron microscopes
None of the above
Q.19
Which one of the following is the correct sequence of passage of light in a compound microscope?
Condenser -Objective lens -Eye -piece -Body tube
Objective lens -Condenser -Body tube -Eye piece
Condenser -Objective lens -Body tube -Eyepiece
Eyepiece -Objective lens -Body tube -Mirror
Q.20
Which of the following is optical illusion?
Rainbow
Earthshine
Halo
Mirage
Q.21
Which of the following characteristics of light remains unchanged when light travels from vaccum enters water?
Speed
Amplitude
Frequency
Wavelength
Q.22
The sky appears blue due to
Rayleigh scattering
Mie scattering
Back scattering
None of the above
Q.23
Purpose of an optical filter is to
Reflect lights of different colours
Dispense light into component colours
Refract light of different colours
Transmit or absorb light of different colours
Q.24
Which of the following cannot be used for making lenses?
Plastic
Soil
Glass
Water
Q.25
Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?
-4.33 diopters
12.33 diopters
-12.33 diopters
4.33 diopters
Q.26
Which one of the following wavelengths of light is most effective in photosynthesis ?
Blue
Green
Orange
Yellow
Q.27
In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is
Decreased by 2%
Decreased by 4%
Increased by 2%
Increased by 4%
Q.28
What is the range of Strong Nuclear force?
Infinite
Very short Subnuclear size
Very short Nuclear size
None
Q.29
One can distinguish a telescope from a microscope by observing
Length
Colour
Size of the lens
Length and size of the lens
Q.30
Electron microscope works on which of the following principles?
Optical interference
Wave Nature of electrons
Motion of charged particle in electromagnetic fields
Faraday's law of Electromagnetic induction
Q.31
To resolve an object in an electron microscope,
The wavelength of the electrons must be close to the diameter of the object
The wavelength of the electrons must be greater than the diameter of the object.
Both A & B
None of the above
Q.32
Which, of the following radiations has the least wavelength ?
X-rays
A-rays
G-rays
B-rays
Q.33
After removing two electrons from helium atom it become?
UV rays
Alpha particle
Gama particle
X rays
Q.34
What is a compound microscope?
A microscope that has one lens.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are concave.
A microscope whose lenses are convex.
Q.35
Parabolic mirrors are used in
Car headlights
Driving mirrors
Dentists mirros
Shaving mirros
Q.36
The illuminating powers of two sources are compared by
A spectrometer
A photometer
A polarimeter
A fluxmeter
Q.37
Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?
-3.75 diopters
-11.25 diopters
3.75 diopters
11.25 diopters
Q.38
A colour-blind person cannot
See distant objects
See black colour
Distinguish between certain colours
Have persistence of vision
Q.39
The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is
Diffraction
Interference
Dispersion
Reflection
Q.40
A simple microscope consists of :
A short focus convex lens
A long focus convex lens
A short focus concave lens
A long focus concave lens
Q.41
Person who is colourblind cannot distinguish between
Black and yellow
Red and green
Yellow and white
Green and blue
Q.42
Name the process of production of energy in the Sun
Nuclear fission
Radioactivity
Nuclear fusion
Ionization
Q.43
Which type of reaction produces the most harmful radiation ?
Fusion reaction
Fission reaction
Chemical reaction
Photo-Chemical reaction
Q.44
Holography is a technique of
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional black and white photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour
Q.45
The least penetrating power ray is
Gamma rays
Beta rays
Alpha rays
None of the above
Q.46
For Gamma radiation, what stops its penetrating abilities?
Lead
Steal
Concrete
All of the above
Q.47
An atom bomb based upon the principle of ________
Nuclear fission
Nuclear fussion
Controlled chain reaction
None of these
Q.48
Atomic packing factor of body centred cubic structure (bcc) is
0.63
0.68
0.69
0.73
Q.49
A nuclear reactor is said to have become 'critical' when
It stops due to malfunctioning
It starts emitting dangerous radioactive radiations
It is shut down to avoid explosion
It is ready to produce controlled energy
Q.50
Magnifying Glass is basically a
Plano-concave lens
Concave lens
Convex lens
Cylindrical lens
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