All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2007 Physics

Q. 9. In gamma ray emission from a nucleus

1. both the neutron number and the proton number change
2. there is no change in the proton number and the neutron number
3. only the neutron number changes
4. only the proton number changes

Sol: Gamma ray is electromagnetic radiation which does not involve any change in proton number or neutron number Correct choice: (2)

Q. 10. If in p-n junction diode, a square input signal of 10 V is applied as shown. Then the output signal across will be

Sol: Diode is forward biased in first half cycle and amplitude of signal is

Correct choice: (4)