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- Question
In a bipolar junction transistor
Options- A. all the three regions (the emitter, the base and the collector) have equal concentrations of impurity
- B. the emitter has the least concentration of impurity
- C. the collector has the least concentration of impurity
- D. the base has the least concentration of impurity
- Correct Answer
- the base has the least concentration of impurity
ExplanationIn terms of concentration of impurity (a.k.a impurity doping concentration, often abbreviated to doping concentration), from the highest to the lowest among the three regions of a bipolar junction, emitter, collector, and base are the correct order. The above order is independent of the type of BJT, npn or pnp
- 1. The frequency of direct current is _____________
Options- A. Zero
- B. 50 HZ
- C. 60 HZ
- D. 100 HZ Discuss
- 2. In the gamma decay of a nucleus
Options- A. the mass number of the nucleus changes whereas its atomic number does not change
- B. the mass number of the nucleus does not change whereas its atomic number changes
- C. both the mass number and the atomic number of the nucleus change
- D. neither the mass number nor the atomic number of the nucleus changes Discuss
- 3. A galvanometer can be converted to a voltmeter by connecting
Options- A. a high resistance in parallel
- B. a high resistance in series
- C. a low resistance in series
- D. a low resistance in parallel Discuss
- 4. The transport phenomenon occurs only in _____ state of a gas and is ______
Options- A. Non-equilibrium, irreversible
- B. Non-equilibrium, reversible
- C. equilibrium, irreversible
- D. equilibrium, reversible Discuss
- 5. Transformer is a device to convert
Options- A. D.C. to A.C.
- B. Low voltage D.C. into high voltage D.C.
- C. Low voltage A.C. into high voltage A.C.
- D. Mechanical energy into Electrical energy Discuss
- 6. The pressure exerted by a 760 mm column of mercury at 0° C is known as
Options- A. 1 pascal
- B. 1 atmosphere
- C. 1 bar
- D. 1 poise Discuss
- 7. Which one of the following physical quantities has the same dimensions as that of Planck?s constant h?
Options- A. Linear momentum
- B. Angular momentum
- C. Force
- D. Potential energy Discuss
- 8. Which one of the following statements is not correct?
Options- A. The response of the ear to sound of increasing intensity is approximately logarithmic.
- B. The sensitivity of the human ear does not vary with the frequency of the sound.
- C. When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave.
- D. Longitudinal waves can travel in all media-solids, liquids and gases. Discuss
- 9. In total internal reflection, the light travel from
Options- A. rarer to denser medium and it occurs with no loss of intensity
- B. denser to rarer medium and it occurs with no loss of intensity
- C. rarer to denser medium and it occurs with loss of intensity
- D. denser to rarer medium and it occurs with loss of intensity Discuss
- 10. The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by
Options- A. 10 MeV
- B. 100 MeV
- C. 1 MeV
- D. 0.1 MeV Discuss
Physics problems
Search Results
Correct Answer: Zero
Correct Answer: neither the mass number nor the atomic number of the nucleus changes
Explanation:
The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable)
Correct Answer: a high resistance in series
Correct Answer: equilibrium, irreversible
Explanation:
The transport phenomenon occurs only in equilibrium state of a gas and is irreversible.
Correct Answer: D.C. to A.C.
Correct Answer: 1 atmosphere
Explanation:
1 atm: It was originally defined as the pressure exerted by 760 mm of mercury at 0 °C and standard gravity (g = 9.80665 m/s2).
Correct Answer: Angular momentum
Explanation:
In S.I. System unit of angular momentum is "joule.Second".
SI unit of Planck's constant is joule-seconds(j-s).
Correct Answer: The sensitivity of the human ear does not vary with the frequency of the sound.
Explanation:
The human ear can respond to minute pressure variations inthe air if they are in the audible frequency range, roughly 20 Hz -20 kHz. In fact, tests conducted show an increased sensitivity in the 3000 Hz range which is the optimal amplification frequency in the human ear. So, the sensitivity of the human ear varies with the frequency of the sound.
Correct Answer: denser to rarer medium and it occurs with no loss of intensity
Explanation:
According to wave theories, for Total internal reflection tohappen: Light must travel from denser medium to rarer medium. Angle of incidence should be greater than critical angle. As in case of TIR, the image is perfectly clear, it implies that there has been no loss of intensity.
Correct Answer: 10 MeV
Explanation:
A photon?s relativistic momentum is given by the equation,E = pc where p is the momentum.
P = 10 MeV/c
So, E = 10 MeV
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