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- Question
The law of conservation of energy states that
Options- A. energy can neither be created nor destroyed
- B. energy can either be created nor destroyed
- C. energy can neither be created or destroyed
- D. energy can either be created or destroyed
- Correct Answer
- energy can neither be created nor destroyed
ExplanationThe law of conservation of energy is a law of science which states that energy can neither be created nor destroyed - only converted from one form of energy to another.
In 1842, Julius Robert Mayer discovered the Law of Conservation of Energy.
- 1. General purpose utility gloves are
Options- A. for surgeries
- B. for cleaning procedures
- C. for handling tubes
- D. All of the above Discuss
- 2. Megahertz is a measurement of
Options- A. Frequency
- B. Speed
- C. Wavelength
- D. Capacity Discuss
- 3. Which has the lowest albedo?
Options- A. dark surfaces
- B. light surfaces
- C. Both A & B
- D. None of the above Discuss
- 4. Is blood homogeneous or heterogeneous?
Options- A. Homogeneous
- B. Heterogeneous
- C. Both A & B
- D. None of the above Discuss
- 5. Which of the following is a renewable source of energy
Options- A. Natural gas
- B. Coal
- C. Wind
- D. Oil Discuss
- 6. The strength of an electromagnet can be increased by
Options- A. increasing the length of the coiled wire
- B. increasing current supply
- C. increasing the number of turns
- D. All of the above Discuss
- 7. Speed of sound is maximum in which among the following?
Options- A. Gases
- B. Vaccum
- C. Liquids
- D. Solids Discuss
- 8. For Gamma radiation, what stops its penetrating abilities?
Options- A. Lead
- B. Steal
- C. Concrete
- D. All of the above Discuss
- 9. Which of these is exhibiting kinetic energy?
Options- A. an archer with a flexed bow
- B. a person sitting on a couch while watching TV
- C. a space station orbiting Earth
- D. All of the above Discuss
- 10. Slip rings are usually made of
Options- A. Aluminium
- B. Copper
- C. Phosphor Bronze
- D. Carbon Discuss
Physics problems
Search Results
Correct Answer: for cleaning procedures
Correct Answer: Frequency
Correct Answer: dark surfaces
Explanation:
Albedo refers to a material's ability to reflect sunlight. Since 30% of the sun's energy is reflected by the entire earth, the earth has an average albedo of 0.30.
Generally, dark surfaces have a low albedo and light surfaces have a high albedo.
Correct Answer: Heterogeneous
Explanation:
Blood is a heterogeneous mixture because the blood cells are physically separate from the blood plasma. The cells have different properties than the plasma. The cells can be separated from the plasma by centrifuging, which is a physical change.
Correct Answer: Wind
Explanation:
The energy sources that are constantly being replenished, such as sunlight, wind, and water. This means that we can use them as much as we want, and we do not have to worry about them running out. Additionally, renewable energy sources are usually much more environmentally friendly than fossil fuels. Overall, they release very few chemicals, like carbon dioxide, that can harm the environment.
Most of this energy comes from fossil fuels, such as coal, oil, and natural gas. These are nonrenewable energy sources, which means that if we use them all up, we can never get more during our lifetime. Fossil fuels also contribute greatly to global climate change by releasing carbon dioxide into the air when they are burned.
Correct Answer: All of the above
Explanation:
The strength of an electromagnet can be increased by increasing the cross-sectional area, increasing the number of turns, increasing current supply, increasing the length of the coiled wire.
Correct Answer: Solids
Explanation:
We know that, in solids all the particles are packed together and hence sound can travel from one to one very fast.
Hence, speed of sound is maximum in solids and decreses from solids to liquids and liquids to gases. Sound can't travel through vaccum.
Correct Answer: All of the above
Explanation:
The highly energetic gamma particles can penetrate most compounds that stop by other types of radiation. However, lead, steel, or concrete can reduce the high energy of these particles, making them less penetrating.
Hence, Gamma radiation can be stopped by a several inches of lead or steel, or several meters of concrete.
Correct Answer: a space station orbiting Earth
Explanation:
Any moving object can exhibit kinetic energy, as kinetic energy is also known as Motional energy.
In the given options, only a space station orbiting Earth is in motion and all the other are in rest position.
Hence, option C) a space station orbiting Earth is only exhibiting kinetic energy.
Correct Answer: Phosphor Bronze
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