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| From: harshaktg | Reply 241 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 16 |
The answer is clearly given below in the explanation
The electrical gadgets used in a house such as bulbs,fans, heater, etc, are
always connected in parallel, but not in series because of the following
reasons:
The wiring will be less.
If there is any case of short circuit it will affect only the
particular appliance.
Posted at: Wed Dec 22 09:36:07 2010 (GMT)
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| From: harshaktg | Reply 242 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 17 |
Rs. 156.
Power = 4 kW
Voltage = 220 V
Time = 12 hrs
Cost per unit = Rs. 3.25
Total cost = Power * time * cost per unit
= 4 * 12 * 3.25
= 156
Therefore the total cost of using the heater = Rs. 156
Posted at: Wed Dec 22 09:40:11 2010 (GMT)
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| From: harshaktg | Reply 243 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 18 |
The answer is clearly given below in the explanation
Similarity:
Both use electro magnets
Difference:
In a.c. generator it converts to electrical energy.
In d.c. motor it converts to mechanical energy
Posted at: Wed Dec 22 09:43:02 2010 (GMT)
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| From: harshaktg | Reply 244 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 22 |
The answer is clearly given below in the explanation
Radioactivity is a nuclear phenomenon in which nucleus of some heavy metals
spontaneously emit alpha, beta and gamma rays to attain stability.
Posted at: Wed Dec 22 09:45:46 2010 (GMT)
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| From: harshaktg | Reply 245 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 23 |
The answer is clearly given below in the explanation
Nuclear energy depends on the mass of the nucleons whereas Chemical
energy depends on the arrangement of electrons in the outer shell.
Nuclear substance emitting nuclear energy releases a lot of energy
whereas Chemical substance emitting chemical energy releases a small amount
of energy.
Posted at: Wed Dec 22 09:50:14 2010 (GMT)
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| From: harshaktg | Reply 246 of 310 | Reply | |
| Subject: tension |
1 more tension(T) should appear. Posted at: Wed Dec 22 13:29:52 2010 (GMT)
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| From: harshaktg | Reply 247 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 28 |
M.A. = L/E
Load
Mechanical Advantage = -------------
Effort
Posted at: Wed Dec 22 13:31:30 2010 (GMT)
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| From: harshaktg | Reply 248 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 31 |
sin i/ sin r
sin i
μ = ------
sin r
Posted at: Wed Dec 22 13:34:54 2010 (GMT)
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| From: harshaktg | Reply 249 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 33 |
The answer is clearly given below in the explanation
According to the minimum deviation position,
Angle of incidence = Angle of emergence
Posted at: Wed Dec 22 13:36:24 2010 (GMT)
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| From: harshaktg | Reply 250 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 34 |
The answer is clearly given below in the explanation
Definition
The phenomenon due to which reputition of sound is heard, when the sound
waves hit a rigid surface(wall, bulilding, etc), is called echo.
Condition
The distance from the observer to the obstacle must be atleast 17 metres.
Posted at: Wed Dec 22 13:40:28 2010 (GMT)
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| From: harshaktg | Reply 251 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 35 |
Radar, sonar
Sonar - To locate the fishes or submarines or underwater ships
Radar - To locate the aircrafts by passing radiations.
Posted at: Wed Dec 22 13:42:01 2010 (GMT)
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| From: harshaktg | Reply 252 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 36 |
Solenoid
Posted at: Wed Dec 22 13:42:33 2010 (GMT)
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| From: harshaktg | Reply 253 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 37 |
Electro magnet
Posted at: Wed Dec 22 13:43:06 2010 (GMT)
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| From: harshaktg | Reply 254 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 38 |
Electric bell or Electric motor
Posted at: Wed Dec 22 13:43:45 2010 (GMT)
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| From: harshaktg | Reply 255 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 39 |
It happens due to RESONANCE
Resonance occurs because the frequency of the applied repeated periodic
forced vibrations becomes equal to the natural frequency of a one or more
parts of the vehicle
Posted at: Wed Dec 22 13:45:40 2010 (GMT)
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| From: harshaktg | Reply 256 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 40 |
Change in speed
To stop the rattling sound there must be a change in speed.
Posted at: Wed Dec 22 13:46:34 2010 (GMT)
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| From: harshaktg | Reply 257 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 41 |
The answer is clearly given below in the explanation
It is because an electric field is produced around the wire, due to the flow
of electric current through it.
Posted at: Wed Dec 22 13:47:59 2010 (GMT)
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| From: harshaktg | Reply 258 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 42 |
North
Posted at: Wed Dec 22 13:48:20 2010 (GMT)
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| From: harshaktg | Reply 259 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 43 |
3 ohm
We know that the resistors are connected in parallel. So:
1/RP = 1/6 + 1/2+ 1/4
1/RP = 2/6
RP = 6/2
RP = 3
= 3 ohm
Posted at: Wed Dec 22 13:52:04 2010 (GMT)
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| From: harshaktg | Reply 260 of 310 | Reply | |
| Subject: Contributed Answer/Explanation to Q. 44 |
2 amphere
We know the formula:
V = I * R
I = V / R
By substituting the values in this formula, we get:
I = 6 / 3
I = 2 Å(amphere)
Posted at: Wed Dec 22 13:54:36 2010 (GMT)
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