COMEDK UGET 2009 paper solved for Medical Engineering And Dental

Here are the questions from the 2009 COMEDK UGET questions paper for physics. All questions are with proper explanation.
1. A simple pendulum has a period T inside a lift when it is stationary. The lift is accelerated upwards with constant acceleration 'a'. The period ?
[A] decreases
[B] increases
[C] remains same
[D] becomes infinite
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2. 90 dB sound is 'x' times more intense than 40 dB sound, then x is
[A] 5
[B] 50
[C] 105
[D] 500
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3.
A star is moving from the earth with speed V. Change in wavelength (dλ) observed on Earth is 
[A] λV/C
[B] λV/(C+V)
[C] λC/(C+V)
[D] λC/V
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4. An open pipe emits fundamental frequency n0 when it emits 3rd harmonic, the pipe can accommodate
[A] 2 nodes 2 antinodes
[B] 3 nodes 4 antinodes
[C] 3 nodes 3 antinodes
[D] 1 node 2 antinodes
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5.
In an adiabatic process
[A] temperature remains constant
[B] pressure remains constant
[C] volume remains constant
[D] there is no transfer of heat
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6. carnot's heat engine takes 300J of heat from a source at 627oC and gives some part of it to sink at 27oC. Work done by engine in one cycle is 
[A] 200J
[B] 300J
[C] 150J
[D] 120J
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7. 15/16th of a radioactive sample disintegrates in 2 hrs. Mean life of radioactive sample is approximately,
[A] 30min
[B] 43min
[C] 21min
[D] 15min
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8. Clear images of soft tissues can be well studied using
[A] MRI
[B] X-rays
[C] Ultrasonic
[D] I.R rays
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9.
Particles which are note composite and hence truly elementary are
[A] mesons
[B] protons
[C] neutrons
[D] leptons
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10. A logic gate whose output will be logic 0 state only when all inputs are in logic 1 state is called
[A] AND
[B] OR
[C] NOR
[D] NAND
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