PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 An active component of an electronic circuit consisting of a small block of semiconducting material to which at least three electrical contacts are made is known as. Rectifier Amplifier Thermocouple Transistor
2 At room temperature the potential difference between the two sides of depletion region for silicon is of the order of. 0.3 v 0.5 V 0.7 V 0.9 V
3 Base current of a transistor is 1 mA and collector current is 99 mA What is emitter current. 1 mA 100 mA 98 mA 110 mA
4 Which of the following circuits is used as local oscillator in radio receivers. AF oscillator Phase Local Loop RF oscillator All of the above
5 Ebers-Moll model describes the working of a BJT FET MOSFET UJT
6 Which one of the following gates in a a universal gate. OR AND NOT NAND
7 Why FET amplifiers are called voltage controlled devices. Input is a current signal Output is a current signal Input is a voltage signal Output is a voltage signal
8 Which of the following configuration of BJTs gives both voltage gain and current gain. common Base Common Emtter Common collector All of the above
9 An emitter follower has High input impedance and high output impedance High input impedance and low output impedance Low input impedance and low output impedance Low input impedance and high output impedance
10 Lissajou's figures are used in a Cathode Ray Oscilloscope while measuring. Time period Frequency Voltage gain phase angle
11 In a resistor, when base width decreases with increasing Vbc, this phenomenon is called. Tunneling Thermal runway Pinch off Early effect
12 How many terminals does a BJT have. 1 2 3 4
13 The average energy released per fission of U is about 200 eV 2 keV 2 MeV 200 MeV
14 Which of the following has greatest binding energy per nucleon. Normal hydrogen Deuterium Tritium Helium-4
15 One particle having zero mass and zero charge is. Positron Electron Neutrino Neutron
16 A deuteron is A type of proton A proton neutron bounded to gather. A type of beta particle A type of neutron
17 Deuterium is A transuranic element A type o cosmic particle An isotope of hydrogen An isotope of helium
18 The half life of a radioactive substance depend on. Pressure Temperature Amount of substance No external influences
19 The loss of mass in a.m.u in a nuclear change can be calculated from energy involved in MeV by Dividing by 931 Multiplying by 931 Diving by 391 Multiplying by 391
20 Nuclear force as compared to electrostatic force is. Weaker and long range Weaker and short range Stronger and longer range Stronger and short range
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