Get daily topic-wise Railway Quiz Questions and answers for various RRB exams like NTPC, JE, ALP, Group C and D. Free section-wise Indian railway quiz for RRB Exam.
Q1.What is the wavelength of visible spectrum?
(a) 1300 Å to 3000 Å
(b) 3900 Å to 7600 Å
(c) 7800 Å to 8000 Å
(d) 8500 Å to 9800 Å
Q2.An electron microscope gives higher magnification than an optical microscope, because
(a) it uses more powerful lenses
(b) the velocity of electron is smaller than that of visible light
(c) the electrons have more energy
(d) the wavelength of electrons is smaller as compared to the wavelength of visible light
Q3. The mass-energy relation is the outcome of
(a) quantum theory
(b) general theory of relativity
(c) field theory of energy
(d) special theory of relativity
Q4. A simple microscope consists of
(a) a short focus convex lens
(b) a long focus convex lens
(c) a short focus concave lens
(d) a long focus concave lens
Q5. The speed of light with the rise in the temperature of the medium
(c) remains constant
(d) drops suddenly
Q6.Which one of the following is used for sun glasses?
(a) Pyrex glass
(b) Flint glass
(c) Crooks glass
(d) Crystal glass
Q7.What is viewed through an electron microscope?
(a) Inside of the human eye
(b) Structure of bacteria and viruses
(c) Inside of human stomach
(d) None of these
Q8.Which combination of colour is the most convenient during day and night time?
(a) Organe and blue
(b) White and black
(c) Yellow and blue
(d) Red and green
Q9.The blue colour of water in the sea is due to
(a) absorption of other colours except blue by water molecules
(b) scattering of blue light by water molecules
(c) reflection of blue light by impurities in sea water
(d) reflection of blue sky by sea water
Q10.Rainbow is seen after rain because of hanging molecules of water which act as
Exp. The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 3900 Å to7600 Å .
Exp. An electron microscope gives higher magnification than an optical microscope, because the wavelength of electrons is smaller as compared to the wavelength of visible light .
Exp. Energy and Mass Are Relative. The equation E = mc2 (special theory of relativity )states that the amount of energy possessed by an object is equal to its mass multiplied by the square of the speed of light.
Exp. Simple microscope is used for observing magnified images of the objects. It consists of a short focus convex lens.
The magnifying power of simple microscope can be determined in two cases. When the final image is formed at least distance of district vision (D),
When the final image is formed at infinity, the M=D/f
Where M = magnifying power
D = distance of distinct vision
f = focal length of the lens
Exp. Speed of light does not depends on the temperature. It is a constant which is denoted by ‘c’.
Exp. Crookes glass mainly cerium oxide (CiO2) is present which sharply absorbs the ultraviolet rays from the sunlight so utilised in making lenses of eye glasses.
Exp. The electron microscope is a type of microscope that uses a beam of electrons to create an image of the specimen. It is capable of much higher magnifications and has a greater resolving power than a light microscope, allowing it to see much smaller objects in finer detail.
Exp. Red and green colour is the most convenient during day and night time .
Exp. The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned.
Exp. Rainbow is seen after rain because of hanging molecules of water which act as prism.
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