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Physics
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A wooden block is dropped from the top of a cliff 100 m high. Simultaneously a bullet of mass 10 g is fired from the foot of the cliff upwards with a velocity of 100 m/s. The bullet and wooden block will meet each other after a time
jeemain
eamcet
physics
1991
q11
asked
Sep 10, 2013
by
meena.p
1
answer
The total mechanical energy of a harmonic oscillator of $A=1$ m and force constant $200 N/m$ is 150 J. Then:
jeemain
eamcet
physics
1991
q10
asked
Sep 10, 2013
by
meena.p
1
answer
Earth is flattened at poles and bulging at the equator. This is due to:
jeemain
eamcet
physics
1991
q9
asked
Sep 10, 2013
by
meena.p
1
answer
The Spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in large radius one is 25 minutes and that for smaller one is 16 minutes, the ratio of thermal conductivities of materials of large sphere to small sphere is:
jeemain
eamcet
physics
1991
q8
asked
Sep 10, 2013
by
meena.p
1
answer
Keeping the banking angle same, to increase the maximum speed with which a vehicle can travel on a curved road by 10 percent the radius of curvature of the road has to be changed from 20 m to :
jeemain
eamcet
physics
1991
q7
asked
Sep 10, 2013
by
meena.p
1
answer
An element '$\mathit{X}$' decays first by positron emission and then two $\alpha$ - particles are emitted in successive radioactive decay. If the product nucleus has mass number 227and atomic number 89 the mass number and atomic number of element '$\mathit{X}$' are:
jeemain
eamcet
physics
1991
q6
asked
Sep 10, 2013
by
meena.p
1
answer
If the work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of same material but with double radius of cross-section and the half the length by 1 mm (joule) is:
jeemain
eamcet
physics
1991
q5
asked
Sep 10, 2013
by
meena.p
1
answer
A charged bead is capable of sliding freely through a string held vertically in tension. An electric field is applied parallel to the string, so that the bead stays at rest at middle of the string. If the electric field is switched off momentarily switched on:
jeemain
eamcet
physics
1991
q4
asked
Sep 10, 2013
by
meena.p
1
answer
The pair of physical quantities having the same dimensional formula is:
jeemain
eamcet
physics
1991
q3
asked
Sep 10, 2013
by
meena.p
1
answer
If '$\mathit{c}$' is velocity of light in free space, the time taken by the light to travel a distance '$\mathit{x}$' in a medium of refractive index '$\mu$' is given by :
jeemain
eamcet
physics
1991
q2
asked
Sep 10, 2013
by
meena.p
1
answer
The apparent coefficient of expansion of a liquid, when heated in a copper vessel is '$\mathit{c}$' and when heated in a silver vessel is '$\mathit{s}$'. If '$\mathit{A}$' is the linear coefficient of expansion of copper then linear coefficient of expansion of silver is :
jeemain
eamcet
physics
1991
q1
asked
Sep 10, 2013
by
meena.p
1
answer
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