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A particle moves rectilinearly with
retardation a whose magnitude is
dependent of velocity as a = b& where
'b' 'is a positive constant. The initial '
velocity of the particle is v,,. How long
will the pairtick move before coming to
rest ?

A modei of solar system is scded down
in the ratio 'k' but of materials of safne
mean density and actual materials of the
planets and the sun. What happens to
orbita3 periods- of revolution of the
planetary models ?
(a) The orbital period of revolution does
not change
(b) The drbital period of revolution
increases by a factor 'k' , .
(c) The orbital period of revolution.
- dlecrcases by a fkctor 'k'
(d) Data insufficient to draw the
conclusion
A pulse of the form y = aeax2 is formed
on a rope. Which one of the following
functions represknts the pulse travelling
at 1.0 d s in the negative x-direction ?
(4 Y = ,*x-l ott2
(W Y =
e(4x"' ot)
(=) y = ae*x+lwZ
2 (4 Y =
&bx -101)
2 -

4. The ultimate limit of resolution of an
optical microscope is set by :
(a) aberrations
(b) length of microscope tube . .
(c) design of objective lens
(d) diffraction of light

.5. 8 g of oxygen and 7 g of nitrogen are
mixed in a container. What is the value
. of 'n' in the expression PV = nRT of this
mixture ?
(a) i/4
(b) 112
(4 2
- (d) 15

6. The ear. piece of a telephone is made of
material having :
(a) large hysteresis and high permeability
(b) low hysteresis and large retentivity
.(c) high permeability and low eddy
cumnt only
(d) low.hysteresis, low eddy current and
high permeability

7. A wire of length L is pIaced parallel to
the lines of force in a uniform magnetic
field B. If I is the current in the wire, '
then it will experience :
(a) a force in the direction of magnetic
field
(b) a force in the direction opposite to
the direction of magnetic field
(c) a force. in the direction perpendicular
to the direction of magnetic field
(d) no force

Attached Files

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