CTET Solved Paper - RTET Feburary 2011 Paper2
136. Frequency of ultrasound is
- Option : D
- Explanation : Greater than 20,000 Hzis ultrasound frequency.
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137. Pitch of sound depends on
- Option : A
- Explanation : Frequency determine the pitch of sound.
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138. The number of magnetic lines of force passing through a given area is known as
- Option : C
- Explanation : Magnetic flux is defined as the number of magnetic lines of force passing through a given area.
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139. A bulb (100 W, 200 V) is connected to a voltage of 160 V. The power dissipation is
- Option : A
- Explanation : Given P = 100 W , V = 200 V
Power P = V2/R
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140. One kilowatt hour is unit of
- Option : B
- Explanation : One kilowatt hour is a commercial unit of energy.
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