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- Question
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
- Correct Answer
- D.C. to A.C.
- 1. Bubbles of air rise up through liquids due to
Options- A. Surface tension and adherence
- B. viscosity and buoyancy
- C. air current over the liquid and buoyancy
- D. Up thrust and surface tension Discuss
- 2. The boiling point of liquids vary as
Options- A. pressure varies
- B. temperature varies
- C. volume varies
- D. density varies Discuss
- 3. Which of the following is not a unit of energy?
Options- A. Calorie
- B. Joule
- C. electron volt
- D. Watt Discuss
- 4. What is the other name of Galileo's law of falling bodies?
Options- A. Law of motion
- B. Newton's first law
- C. Newton's second law
- D. Newton's third law Discuss
- 5. A person lifts luggage of 20 kg from the ground and puts it on his head 2 in above the ground. Calculate the work done by him. (g = l0 )
Options- A. 20 J
- B. 400J
- C. 200J
- D. 40J Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. The frequency of direct current is _____________
Options- A. Zero
- B. 50 HZ
- C. 60 HZ
- D. 100 HZ Discuss
- 10. 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 Discuss
Physics problems
Search Results
Correct Answer: viscosity and buoyancy
Correct Answer: pressure varies
Correct Answer: Watt
Explanation:
The watt(symbol: W) is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second, and is used to quantify the rate of energy transfer. In dimensional analysis it is described by
Correct Answer: Newton's first law
Correct Answer: 400J
Correct Answer: equilibrium, irreversible
Explanation:
The transport phenomenon occurs only in equilibrium state of a gas and is irreversible.
Correct Answer: a high resistance in series
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: Zero
Correct Answer: the base has the least concentration of impurity
Explanation:
In 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
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