The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is
Hygrometer
Hypsometer
Hydrometer
Densimeter
Correct Answer :
C. Hydrometer
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Diamond shines because of its
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hardness
high density
high refractive index and low critical angle
A stationary elevated object has
kinetic energy
potential energy
momentum
both potential and kinetic energy
The solar wind is composed of
outward stream of protons and electrons on the surface of the sun during solar flares and sun-spot activity
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A light year means
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colours which cannot be produced by mixing other colours
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A timer in a race is at the finish line. He should start his stop watch
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the moment he sees the flash
either (a) or (b) since that makes no difference
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Which of the following can produce electricity?
resistor
thermocouple
light bulb
neon tube
Which of the following is not electromagnetic waves?
heat waves
sound waves
radio waves
light waves
When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
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acceleration due to the gravity at the place
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Which part of the eye photographic camera?
Lens
Iris
Retina
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Credit for starting Space Science Research in India goes to
HJ Bhabha
SS Bhatnagar
V Sarabhai
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equal to its radius of curvature
equal to the reciprocal of its focal length (in metres)
equal to twice its focal length
Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because
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of the higher temperature of the surroundings
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there is no real fall in temperature
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps
the ball will travel towards the centre of the circle and fall down
it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
it will fall down at the same place where the string breaks
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When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
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the green ray
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To produce beats it is necessary to have two waves
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A man Jumping out of a moving train is thrown
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backward
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reflects
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A star contains
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22% helium
traces of most other elements including oxygen, neon, carbon and nitrogen
All the above
Out of the following, name the fluorescent substance.
quinine sulphate solution
paraffin oil
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Which of the following is fissionable?
U-234
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U-238
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Which of the following wires of same dimensions offers least resistance to the ,flow of current?
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aluminium
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U-235
U-238
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