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Physics Questions Answers
Superconductivity was first observed in the year
1911
1955
1985
1995
1911
Consider the following statements : In nuclear power reactors
1. Uranium-235 is used as the fission material.
2. Graphite is used as a moderator.
3. Rods of lead are used to control the rate of nuclear reaction.
Which of the above statements are correct?
1, 2 and 3
1 and 2
2 and 3
1 and 3
1, 2 and 3
When dispersion of white light takes place through a prism, the maximum deviation is suffered by which one of the following colours?
Red
Yellow
Green
Violet
Violet
Usually light travels faster than sound. However, when we switch a television set on, the picture comes later than the sound. The reason is that
in TV transmission, sound is transmitted first and picture is transmitted later
there is always a delay in the picture tube getting switched on
emission of electrons from the picture tube takes time
the wiring for picture tube is such longer compared to that for the speakers
emission of electrons from the picture tube takes time
Correct and virtual images are always produced by
plane and convex mirrors
plane mirrors alone
concave and convex mirrors
concave mirrors alone
plane and convex mirrors
Which wave phenomenon is not common to both light and sound waves?
Diffraction
Polarisation
Reflection
Refraction
Polarisation
Consider the following statements:
I. Pauli predicted the existence of neutrino
II. Fermi designed the first atomic reactor
Which of these statements is/are correct?
I only
II only
both I and II
Neither I nor II
both I and II
Which one has the highest value of specific heat?
Glass
Copper
Lead
Water
Water
A converging lens of power 4D is kept in contact with a diverging lens of power-2D. The nature and the focal length of the combination is —
converging 25 cm
converging 50 cm
diverging 25 cm
diverging 50 cm
converging 50 cm
A solid sphere, a disc and a ring of the same mass and radius are allowed to roll down in frictionless inclined plane simultaneously from the same height. In the context, which one of the following statement is correct?
The disc reaches down first
The sphere reaches down first
The ring reaches down first
All of them reach down simultaneously
The sphere reaches down first