Discussion
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- Question
Kilohertz is a unit which measures
Options- A. Electromagnetic radio wave frequencies
- B. Electric resistance
- C. Power used by a current of one ampere
- D. Voltage
- Correct Answer
- Electromagnetic radio wave frequencies
- 1. A doppler effect occurs when a source of sound moves
Options- A. away from you
- B. towards you
- C. Both A & B
- D. None of the above Discuss
- 2. The force that generates wind is
Options- A. Gravity force
- B. Pressure gradient force
- C. Coriolis force
- D. Centrifugal force Discuss
- 3. 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
- 4. 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
- 5. Which type of radiation has the lowest penetrating ability?
Options- A. Alpha
- B. Beta
- C. Gamma
- D. All of the above Discuss
- 6. Bandwidth is the
Options- A. a measure of the width of a range of frequencies
- B. the rate of data transfer
- C. both a & b
- D. None of the above Discuss
- 7. In a _________ the wave particles of the medium vibrate in a direction perpendicular to the direction of wave propagation
Options- A. longitudinal
- B. rolling
- C. transverse
- D. field Discuss
- 8. A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s]
Options- A. 1568 J
- B. 1568 C
- C. 1568 W
- D. 1568 N Discuss
- 9. What is the minimum distance (in metres) required to hear an echo?
Options- A. 10
- B. 13
- C. 17
- D. 21 Discuss
- 10. Choose the most appropriate answer:Natural radioactivity was discovered by
Options- A. Marie Curie
- B. Earnest Rutherford
- C. Henry Bacquerel
- D. Enrico Fermi Discuss
Physics problems
Search Results
Correct Answer: Both A & B
Correct Answer: Pressure gradient force
Explanation:
Wind is the flow of gases on a large scale. On the surface of the Earth, wind consists of the bulk movement of air. The force that generates wind is called as Pressure gradient force.
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.
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: Alpha
Explanation:
In order of increasing penetration power, alpha particles have the lowest, then beta particles, then gamma rays.
Correct Answer: both a & b
Correct Answer: transverse
Correct Answer: 1568 J
Correct Answer: 17
Correct Answer: Henry Bacquerel
Explanation:
Natural radioactivity was discovered by Henri Bacquerel.
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