AIIMS (All India Institute of Medical Sciences) Physics: Questions 157 - 161 of 500
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Question number: 157
» Electronic Devices » Junction Transistor
Appeared in Year: 2005
Question
Consider an N – P – N transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current –
Choices
Choice (4) | Response | |
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a. | 10 mA |
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b. | 1.01mA |
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c. | 1.1 mA |
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d. | 0.01 mA |
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Question number: 158
» Oscillations and Waves » Speed of a Wave
Appeared in Year: 2002
Question
A string in a musical instrument is 50 cm long and its fundamental frequency is 800 Hz. If a frequency of 1000 Hz is to be produced, then required length of string is –
Choices
Choice (4) | Response | |
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a. | 20 cm/s |
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b. | 200 cm/s |
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c. | 100 cm/s |
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d. | 50 cm/s |
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Question number: 159
» Oscillations and Waves » Speed of a Wave
Appeared in Year: 2001
Question
The tension in a piano wire is 10N. What should be the tension in the wire to produce a note of double the frequency?
Choices
Choice (4) | Response | |
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a. | 20N |
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b. | 40N |
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c. | 80N |
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d. | 10N |
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Question number: 160
» Dual Nature of Matter and Radiation » Black-Body Radiation
Appeared in Year: 2003
Question
A black body, at a temperature of 227°C, radiates heat at a rate of. When its temperature is raised to 727°C, the heat radiated by it in will be closest to –
Choices
Choice (4) | Response | |
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a. | 40 |
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b. | 640 |
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c. | 320 |
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d. | 160 |
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Question number: 161
» Communication System » Sky and Space Wave Propagation
Appeared in Year: 2005
Question
For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere –
Choices
Choice (4) | Response | |
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a. |
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b. |
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c. |
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d. |
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