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| From: haroonaman | Reply 41 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 8 |
The colour of the flower will be black.
Posted at: Fri Feb 12 03:29:11 2010 (GMT)
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| From: haroonaman | Reply 42 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 12 |
The maximum displacement of a particle from its mean position is called the
amplitude.
Posted at: Fri Feb 12 03:34:30 2010 (GMT)
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| From: haroonaman | Reply 43 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 13 |
Frequency is the number of vibrations per second.
Posted at: Fri Feb 12 03:38:08 2010 (GMT)
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| From: haroonaman | Reply 44 of 141 | Reply | View replies (1)
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| Subject: Contributed Answer/Explanation to Q. 14 |
The image is formed beteen second focal point and twice of second focal
point.
Posted at: Fri Feb 12 03:46:24 2010 (GMT)
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| From: haroonaman | Reply 45 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 15 |
In reflection of light from a plane mirror some light energy is lost whereas
in total internal reflection of light no light energy is lost.
Posted at: Fri Feb 12 03:48:54 2010 (GMT)
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| From: haroonaman | Reply 46 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 16 |
The V - I graph is used for finding resistance of a substance and since the
resistance is lesser in parallel than in series therefore we can say that
the more gentle slope represents the prallel combination and the steep slope
represents the series combo.
Posted at: Fri Feb 12 03:54:09 2010 (GMT)
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| From: haroonaman | Reply 47 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 17 |
Out of the three connecting wires the two wires which are at the same
potential are the live wire and the neutral wire.
Posted at: Fri Feb 12 03:55:37 2010 (GMT)
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| From: haroonaman | Reply 48 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 18 |
The switch should always be connected in the live wire.
Posted at: Fri Feb 12 03:57:37 2010 (GMT)
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| From: haroonaman | Reply 49 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 19 |
Helium ion
Posted at: Fri Feb 12 04:04:23 2010 (GMT)
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| From: haroonaman | Reply 50 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 20 |
doubly ionized helium ion
Posted at: Fri Feb 12 04:05:16 2010 (GMT)
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| From: haroonaman | Reply 51 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 23 |
Burns caused by steam are more severe than those caused by boiling water as
steam has a lot of latent heat and energy and when steam condenses on the
skin it releases this stored latent heat energy and hence this type of burns
are more severe .
Posted at: Fri Feb 12 04:10:26 2010 (GMT)
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| From: haroonaman | Reply 52 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 24 |
Two properties are :
(i) Metals have a low work function.
(ii) Metals have a high melting point and hence do not melt when heated for
thermionic emmisions.
Posted at: Fri Feb 12 04:15:05 2010 (GMT)
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| From: haroonaman | Reply 53 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 25 |
One kilowatt - hour is the electricity energy consumed by an electrical
appliance of power 1kW when it is used for 1 hour. 1kWh = 10 to the power of
6 JOULE
Posted at: Fri Feb 12 04:24:22 2010 (GMT)
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| From: haroonaman | Reply 54 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 26 |
The work done can be measured when force is applied at an angle to the
direction of displacement by multiplying even the cosine of the angle of
displacement with the displacament and the force.
Posted at: Fri Feb 12 04:33:37 2010 (GMT)
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| From: haroonaman | Reply 55 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 27 |
Solar energy to chemical energy.
Posted at: Fri Feb 12 04:34:51 2010 (GMT)
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| From: haroonaman | Reply 56 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 28 |
Electrical energy to chemical energy.
Posted at: Fri Feb 12 04:35:29 2010 (GMT)
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| From: haroonaman | Reply 57 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 29 |
Efficiency = mechanical Advantage / Velocity Ratio .
Posted at: Fri Feb 12 04:38:30 2010 (GMT)
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| From: haroonaman | Reply 58 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 31 |
The lower block of this pulley system should be of negligeble weight so as
to increase the efficiency of the pulley.
Posted at: Fri Feb 12 04:43:23 2010 (GMT)
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| From: haroonaman | Reply 59 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 39 |
The value is =
The value for angle of deviation is 90o.
Posted at: Fri Feb 12 04:49:00 2010 (GMT)
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| From: haroonaman | Reply 60 of 141 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 40 |
The invisible electromagnetic rays that help us to study the structure of
crystals is X-rays and this type of rays are also used for detecting
fractures in bones.
Posted at: Fri Feb 12 04:52:59 2010 (GMT)
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