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| From: slash22 | Reply 21 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 39 |
45 degrees.
Posted at: Wed Jan 13 13:12:36 2010 (GMT)
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| From: slash22 | Reply 22 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 40 |
(i)X-Rays (ii)Fracture in bones/art forgeries.
Posted at: Wed Jan 13 13:19:02 2010 (GMT)
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| From: slash22 | Reply 23 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 41 |
The speed increases.
Posted at: Wed Jan 13 13:19:21 2010 (GMT)
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| From: slash22 | Reply 24 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 41 |
speed increases.
Posted at: Wed Jan 13 13:20:34 2010 (GMT)
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| From: slash22 | Reply 25 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 46 |
The heat energy recquired to increase the temparature of a subsatance of
unit mass by 1 K.
Posted at: Wed Jan 13 13:22:04 2010 (GMT)
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| From: slash22 | Reply 26 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 47 |
The heat energy is used up in the change in state.
Posted at: Wed Jan 13 13:22:41 2010 (GMT)
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| From: slash22 | Reply 27 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 50 |
If due to some reason such as short-circiuting, an excesssive amt of current
flows in the live wires, it passes to the earth trough the live wire &
prevents the user from shock.
Posted at: Wed Jan 13 13:27:09 2010 (GMT)
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| From: rohitjaithliya | Reply 28 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 1 |
2
as effort arm is more than load arm
Posted at: Thu Jan 21 13:56:19 2010 (GMT)
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| From: salma94 | Reply 29 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 15 |
Characteristics:- 1. Same size as object 2.Real and inverted.
Position:-other side of lens at 2F
Posted at: Mon Jan 25 14:42:46 2010 (GMT)
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| From: anirudhthegreat | Reply 30 of 141 | Reply | |
| Subject: We cant tell no loss of energy but less loss of energy |
We cant tell no loss of energy but less loss of energy Posted at: Fri Feb 5 04:18:57 2010 (GMT)
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| From: mjh_syed | Reply 31 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 4 |
Because they are least scattered by FOG..
Posted at: Mon Feb 8 09:36:29 2010 (GMT)
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| From: mjh_syed | Reply 32 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 52 |
1)Increase in number of turnings of copper wire.2)Increase in current.
Posted at: Mon Feb 8 09:40:47 2010 (GMT)
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| From: haroonaman | Reply 33 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 1 |
Class II levers always have a mechanical advantage greater than 1. The
mechanical advantage of the lever can be increased by shifting the load
slightly towards the fulcrum in such a way that the effort arm is the sm but
the length of the load arm reduces.
Posted at: Fri Feb 12 02:34:35 2010 (GMT)
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| From: haroonaman | Reply 34 of 141 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 2 |
Given below
1/2 mv2
Body A
=
Body B =
mass = m
kg
mass = m kg
height = 20
m
height = 30 m
g is constant.
Ratio of potential energy = mgh/mgh2
=
m*g*20 / m*g*30
= 20 / 30
=
2 / 3 or 2 : 3
Posted at: Fri Feb 12 02:41:28 2010 (GMT)
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| From: haroonaman | Reply 35 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 2 |
Given below
Potential Energy = mgh.
Body A
=
Body B =
mass = m
kg
mass = m kg
height = 20
m
height = 30 m
g is constant.
Ratio of potential energy = mgh/mgh2
=
m*g*20 / m*g*30
= 20 / 30
=
2 / 3 or 2 : 3
Posted at: Fri Feb 12 02:42:05 2010 (GMT)
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| From: haroonaman | Reply 36 of 141 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 4 |
Infra red radiations are preferred over ordinary visible light for taking
photographs in fog as infra red radiations have a larger wave length and can
penetrate through gaseous,liquid an certain solid materials and hence it is
used for taking photo in fog.
Posted at: Fri Feb 12 02:48:08 2010 (GMT)
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| From: haroonaman | Reply 37 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 4 |
Infra red radiations are preferred over ordinary visible light for taking
photographs in fog as infra red radiations have a larger wave length and can
penetrate through materials and the rays are less scattered and hence it is
used for taking photo in fog.
Posted at: Fri Feb 12 02:49:41 2010 (GMT)
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| From: haroonaman | Reply 38 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 5 |
Relative density or specific gravity, is the ratio of the density (mass of a
unit volume) of a substance to the density of a given reference material.
Specific gravity usually means relative density with respect to water.
Posted at: Fri Feb 12 02:56:19 2010 (GMT)
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| From: haroonaman | Reply 39 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 6 |
Water is not suitable as a barometric liquid as the rise in the level of
water is too much and hence it will be inconvenient as the tube will also be
of a bigger size and also because water begins to evaporate after a while.
Posted at: Fri Feb 12 03:06:00 2010 (GMT)
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| From: haroonaman | Reply 40 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 7 |
According to Snell's Law of Refraction of Light the ratio of the sine of
incidence to the sine of refraction is a constant.
Posted at: Fri Feb 12 03:28:26 2010 (GMT)
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