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- Question
What device converts light energy to electrical energy?
Options- A. Photodiode
- B. Photovoltaic cell
- C. Thermocouple
- D. Heliostats
- Correct Answer
- Photovoltaic cell
- 1. Thermoplastic materials are those materials which
Options- A. Do not become hard with the application of heat and pressure and no chemical change occurs
- B. Are flexible and can withstand considerable wear under suitable conditions
- C. Are formed into shape under heat and pressure and results in a permanently hard product
- D. Are used as a friction lining for clutches and brakes Discuss
- polyethylene,
- polypropylene,
- polyvinyl chloride,
- polystyrene,
- polybenzimidazole,
- acrylic,
- nylon and
- teflon
- 2. Low voltage cables are meant for use up to
Options- A. 3.3 kV
- B. 1.1kV
- C. 11 kV
- D. 0.5 kV Discuss
- 3. The term photon refers to
Options- A. light ray
- B. sub atomic particle
- C. radiation
- D. None of the above Discuss
- 4. Which determines the frequency of a sound wave?
Options- A. Amplitude
- B. Speed
- C. Source
- D. Medium Discuss
- 5. Water is more dense than cooking oil.
Options- A. TRUE
- B. FALSE Discuss
- 6. Electric current is measured by which instrument?
Options- A. voltmeter
- B. ammeter
- C. barometer
- D. sinometer Discuss
- 7. The energy associated with motion is called
Options- A. Potential energy
- B. Kinetic energy
- C. Both A & B
- D. Stored energy Discuss
- 8. Which type of radiation has the lowest penetrating ability?
Options- A. Alpha
- B. Beta
- C. Gamma
- D. All of the above Discuss
- 9. Electrical burns occur principally because of
Options- A. Radiation pulses of the electricity
- B. The heat generated by the flow of electrical current through the body
- C. The high energy of electrons
- D. All of the above Discuss
- 10. Gamma rays are emanations that have
Options- A. charge but no mass
- B. neither mass nor charge
- C. both mass and charge
- D. mass but no charge Discuss
Physics problems
Search Results
Correct Answer: Do not become hard with the application of heat and pressure and no chemical change occurs
Explanation:
Thermoplastic materials is a type of plastic material that can be cooled and heated several times without any change in their chemistry or mechanical properties.
Examples of Thermoplastic ::
Correct Answer: 1.1kV
Correct Answer: sub atomic particle
Explanation:
The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force. The photon has zero rest mass and always moves at the speed of light within a vacuum.
Correct Answer: Amplitude
Explanation:
The frequency of a sound wave is determined by the amplitude of the wave. As amplitude of the wave is high the frequency of the wave will also be high.
Correct Answer: TRUE
Explanation:
Yes, the given statement that water is more dense than cooking oil is TRUE as water more denser than oil it is sinked when it is poured in oil.
Correct Answer: ammeter
Correct Answer: Kinetic energy
Explanation:
Energy can be either potential or kinetic. The energy associated with motion is called Kinetic energy and similarly, the energy associated with position is called Potential energy.
Correct Answer: Alpha
Explanation:
In order of increasing penetration power, alpha particles have the lowest, then beta particles, then gamma rays.
Correct Answer: The heat generated by the flow of electrical current through the body
Explanation:
Electrical burns occur principally because of the heat generated by the flow of electrical current through the body.
Burns caused by electricity are divided into three types:
electrical burns,
arc burns, and
thermal contact burns.
Electrical burns can result when a person touches electrical wiring or equipment that is used or maintained improperly.
Correct Answer: neither mass nor charge
Explanation:
A gamma ray or gamma radiation, is a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy.
Gamma rays are emanations that have neither mass nor charge.
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