Q.1
The device used for measuring the wavelength of X-rays is
Q.2
Who discovered X-ray?
Q.3
Which of the following has the longest wavelength?
Q.4
Energy of Ultraviolet rays is great than
Q.5
In a vacuum, all electromagnetic waves have the same
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?
Q.7
Which of the following has the lowest frequency?
Q.8
Night photography and photopraphy in mist and fog are possible using
Q.9
Transition ions absorb light in :
Q.10
Fibre optics work on the principle of
Q.11
Rainbow is seen after rain because of hanging molecules of water which act as
Q.12
Lens is made up of which glass
Q.13
What is colour of light related to ?
Q.14
The redness in atmosphere at Sunrise and Sunset is due to :
Q.15
The information of brilliant colors in a thin soap film is a consequence of the phenomena of
Q.16
Optic fibres are used in :
Q.17
The final image in a simple microscope is
Q.18
Which microscope is often used to view metal surfaces?
Q.19
Which one of the following is the correct sequence of passage of light in a compound microscope?
Q.20
Which of the following is optical illusion?
Q.21
Which of the following characteristics of light remains unchanged when light travels from vaccum enters water?
Q.22
The sky appears blue due to
Q.23
Purpose of an optical filter is to
Q.24
Which of the following cannot be used for making lenses?
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?
Q.26
Which one of the following wavelengths of light is most effective in photosynthesis ?
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
Q.28
What is the range of Strong Nuclear force?
Q.29
One can distinguish a telescope from a microscope by observing
Q.30
Electron microscope works on which of the following principles?
Q.31
To resolve an object in an electron microscope,
Q.32
Which, of the following radiations has the least wavelength ?
Q.33
After removing two electrons from helium atom it become?
Q.34
What is a compound microscope?
Q.35
Parabolic mirrors are used in
Q.36
The illuminating powers of two sources are compared by
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?
Q.38
A colour-blind person cannot
Q.39
The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is
Q.40
A simple microscope consists of :
Q.41
Person who is colourblind cannot distinguish between
Q.42
Name the process of production of energy in the Sun
Q.43
Which type of reaction produces the most harmful radiation ?
Q.44
Holography is a technique of
Q.45
The least penetrating power ray is
Q.46
For Gamma radiation, what stops its penetrating abilities?
Q.47
An atom bomb based upon the principle of ________
Q.48
Atomic packing factor of body centred cubic structure (bcc) is
Q.49
A nuclear reactor is said to have become 'critical' when
Q.50
Magnifying Glass is basically a
0 h : 0 m : 1 s