NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Physics MCQs (Practice_Test 4 of 35)
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- For the following nuclear fusion reaction in a stellar system e + energy
- only very high temperature is required
- normal temperature and very high pressure are required
- very high temperature and comparatively high pressure are required
- very high temperature and very low pressure are required
- If the mass of neutron = 1.7 × 10 − 27 kg, then the de-Broglie wavelength of neutron of energy 3 eV is
- 0.14 × 10 − 11 m
- 0.14 × 10 − 10 m
- 1.4 × 10 − 10 m
- 1.4 × 108 m
- The proper mean-life of a Muon is 2.2 × 10 − 6, s: If it is travelling at a speed of 0.8 c, its lifetime will be
- 3.66 microseconds
- 2.75 micro seconds
- 2.20 micro seconds
- 1.32 micro seconds
- Consider the following statements regarding “Hadrons”
- Mesons and Baryons are together known as Hadrons
- Only Baryons are known as Hadrons
- All Hadrons can be thought to be made of quarks
- Which of the above statement (s) is⟋are correct?
- 1 alone
- 2 alone
- 2 and 3
- 1 and 3
- Match List I with List II and select the correct answer:
Table Supporting: NET, IAS, State-SET (KSET, WBSET, MPSET, Etc.) , GATE, CUET, Olympiads Etc. : Physics MCQs (Practice_Test 4 of 35) List-I (Principle) List-II (Process) - Conservation of charges
- Conservation of energy
- Violation of Parity
- Conservation of momentum
- Neutrino in beta decay
- Weak interactions
- Pair production in the vicinity of a nucleus
- Annihilation of electron and positron
- A
- B
- C
- D
- 4
- 1
- 3
- 2
- 1
- 3
- 2
- 4
- 4
- 1
- 2
- 3
- 2
- 4
- 1
- 3
- Consider the following events:
- Positive voltage on the anode pulling the electrons
- Heating the emitter (cathode)
- Electrons passing the potential minimum near the cathode due to space charge
- Secondary electrons
- The correct sequence in which these events occur inside an operating diode (valve) is
- 1,2, 3,4
- 2,1, 3,4
- 2,3, 4,1
- 4,2, 3,1
- The anode current in a triode valve is given by if VA = 300 V, then the minimum negative value of grid bias voltage required to cut off the valve will be
- 10 V
- V
- 10 x V
- 100 V
- Above figure shows a half-wave rectifier with resistive load RL, which is far greater than the diode forward resistance. If the value of capacitor C is considerably large, then the do voltage across R1 is
- 10 V
- about 5 V
- about 14 V
- 28 V
- If the barrier potential changes with biasing of a p-n junction diode, then the barrier potential will
- increase with both reverse and forward bias
- decrease with both reverse and forward bias
- increase with forward bias and decrease with reverse bias
- increase with reverse bias and decrease with forward bias
- The mutual characteristic of a triode is shown in the above figure for operating point Q specified by VA = 200 V, VG =-4 V and IA = 10 mA. If the anode slope resistance? p = 10 k? then the amplification factor p will be
- 10 − 6
- 10 − 3
- 15
- 103
- Match List I with List II and select the correct answer:
Table Supporting: NET, IAS, State-SET (KSET, WBSET, MPSET, Etc.) , GATE, CUET, Olympiads Etc. : Physics MCQs (Practice_Test 4 of 35) List-I (Device) List-II (Important Property) - P-N diode
- Vaccum diode
- Triode
- BJT
- Current amplification
- Three different circuit configurations possible
- Rectification
- Avalanche breadown
- A
- B
- C
- D
- 4
- 3
- 2
- 1
- 4
- 3
- 1
- 2
- 3
- 1
- 2
- 4
- 2
- 3
- 4
- 1
- When a transistor amplifier having current gain of 75 is given an input signal v i = 2sin [157 t + ? ⟋2] the output signal is found to be v 0 = 200 sin [157 t + 3] ? The transistor is connected as 2
- a common collector amplifier
- a common base amplifier
- a common emitter amplifier
- an oscillator
- Match List I with List II, in respect of a BJT connected in the CE configuration and select the correct answer:
Table Supporting: NET, IAS, State-SET (KSET, WBSET, MPSET, Etc.) , GATE, CUET, Olympiads Etc. : Physics MCQs (Practice_Test 4 of 35) List-I (Characteristics) List-II (Properties) - Power gain
- Voltage gain
- Phase change between I⟋O
- Input impedance
- Lowest
- Yes
- Low
- High
- Highest
- A
- B
- C
- D
- 3
- 4
- 5
- 2
- 5
- 4
- 2
- 3
- 5
- 3
- 2
- 4
- 4
- 2
- 1
- 3
- The circuit diagram of a common emitter amplifier using a silicon transistor with hFE = 100 is shown in the above figure. It is operated at VCE = 8 V. IC = 2 mA In this circuit RB.In k? will be
- 7.2
- 7.5
- 720
- 750
- Radiocarbon is produced in the atmosphere as a result of
- collision between fast neutrons and nitrogen nuclei present in the atmosphere
- action of ultraviolet light from the sun on atmospheric oxygen
- action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- lightning discharge in atmosphere
- Figure I shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are shown in figure II. The logic circuit is
- OR gate
- AND gate
- NAND gate
- NOR gate
- Figure I shows a two-input type of logic circuit where A and IS are the inputs and C is the output. The truth table of the logic gate is give in figure It. The logic gate is
- AND
- OR
- NOR
- NAND
- If the output of a logic gate is 0 when all its inputs are at logic 1, then the gate is either
- NAND or Ex-NOR
- NOR or OR
- Ex-OR or NOR
- AND or NOR