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- Question
Electrical Arcing occurs when
- Correct Answer
- An electric arc is a visible plasma discharge between two electrodes that is caused by electrical current ionizing gasses in the air Electric arcs occur in nature in the form of lightning
- 1. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
Options- A. rough white
- B. rough black
- C. shining white
- D. shining black Discuss
- 2. For accurate scientific work, temperatures are often measured by
Options- A. mercury thermometers
- B. alcohol thermometers
- C. platinum resistance thermometers
- D. thermoelectric thermometers Discuss
- 3. When a bullet is fired from a gun
Options- A. the gun moves forward
- B. the gun jumps up
- C. the gun does not move
- D. the gun recoils with the same momentum as the bullet Discuss
- 4. Radian is used to measure
Options- A. Temperature
- B. Intensity of Flame
- C. Angle
- D. Solid Angle Discuss
- 5. Radiocarbon is produced in the atmosphere as a result of
Options- A. collision between fast neutrons and nitrogen nuclei present in the atmosphere
- B. action of ultraviolet light from the sun on atmospheric oxygen
- C. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- D. lightning discharge in atmosphere Discuss
- 6. Which planet has the lowest density?
Options- A. Earth
- B. Jupiter
- C. Saturn
- D. Neptune Discuss
- 7. The p wave of a normal Electrocardiogram indicates
Options- A. atrial depolarization
- B. Ventricular repolarization
- C. atrial repolarization
- D. Ventricular depolarization Discuss
- 8. Which statement best describes an igneous intrusion?
Options- A. Igneous intrusion for when ice crystals splash into lava
- B. Magma is injected into surrounding rock forming an igneous intrusive
- C. Magma is exported to an open area and forms iron
- D. Magma explodes to the surface and forms a smooth outer layer of rock Discuss
- 9. Sound waves cannot travel through
Options- A. Gas
- B. Liquid
- C. Vacuum
- D. Solid Discuss
- 10. What is a property of most metals?
Options- A. Conductivity
- B. Malleability
- C. Luster
- D. All of the above Discuss
Physics problems
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Correct Answer: rough black
Explanation:
Black surfaces are good emitters of heat. If the black surface is rough too, the emitting will be better. Shinning surfaces reflect black radiation . So if the black surface is also shining the effectiveness of emitting heat is lessened.
Correct Answer: platinum resistance thermometers
Explanation:
The resistance of metallic conductors e.g, platinum, increases with rise of temperature . The increase in temperature results in a decrease of current which can be recorded in a galvanometer if the conductor is included in an electrical circuit. Thus the temperature can be known; platinum resistance thermometer is used generally for accurate scientific work. When two dissimilar metals are joined at the ends, and these ends are subjected to a difference of temperature, a current flows through the metals. Greater the difference of temperature , greater the current. So the curent strength can form the basis for measuring the difference in temperature. And when one of these temperatures is known, we can calculate the other.
Correct Answer: the gun recoils with the same momentum as the bullet
Explanation:
Newton's III law involved
Correct Answer: Angle
Explanation:
Kelvin is used to measure Temperature,
Candela is used to measure Intensity of flame,
Steredian is used to measure Solid Angle.
Correct Answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere
Correct Answer: Saturn
Explanation:
Saturn, the solar system's second largest planet that takes the prize for least dense. It's less dense than water, which has led many people to postulate that it would float.
However, even if it somehow found its way to a body of water large and deep enough to contain it, Saturn would break apart and its rocky core would sink.
Correct Answer: atrial depolarization
Explanation:
The P wave in the ECG represents atrial depolarization, which results in atrial contraction, or atrial systole.
The P wave is a summation wave generated by the depolarization front as it transits the atria.
Correct Answer: Magma is injected into surrounding rock forming an igneous intrusive
Explanation:
Magma is injected into surrounding rock forming an igneous intrusive.
Actually it is a plutonic formation in which magma present beneath Earth surface deforms the shape of rocks present above it
Correct Answer: Vacuum
Explanation:
Sound waves cannot travel through a Vacuum.
A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.
Correct Answer: All of the above
Explanation:
We know that most of the metals are goof conductors of electricity and heat. Metals are very strong but they are malleable i.e, they can be bent into a shape. These are shiny when they are cut or polished.
Hence, metals are malleable, conductors and luster. All the above are properties of the metals.
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