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- Question
Which has the lowest albedo?
Options- A. dark surfaces
- B. light surfaces
- C. Both A & B
- D. None of the above
- Correct Answer
- dark surfaces
ExplanationAlbedo 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.
- 1. Is blood homogeneous or heterogeneous?
Options- A. Homogeneous
- B. Heterogeneous
- C. Both A & B
- D. None of the above Discuss
- 2. Which of the following is a renewable source of energy
Options- A. Natural gas
- B. Coal
- C. Wind
- D. Oil Discuss
- 3. Work done in a free expansion process is
Options- A. Minimun
- B. 0
- C. Maximum
- D. None of the above Discuss
- 4. Is air homogeneous or heterogeneous?
Options- A. homogeneous
- B. heterogeneous
- C. Both A & B
- D. None of the above Discuss
- 5. The modulus of elasticity for mild steel is approximately equal to
Options- A. 210 kN/mm2
- B. 100 kN/mm2
- C. 80 kN/mm2
- D. 10 kN/mm2 Discuss
- 6. Megahertz is a measurement of
Options- A. Frequency
- B. Speed
- C. Wavelength
- D. Capacity Discuss
- 7. General purpose utility gloves are
Options- A. for surgeries
- B. for cleaning procedures
- C. for handling tubes
- D. All of the above Discuss
- 8. 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 Discuss
- 9. 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
- 10. Speed of sound is maximum in which among the following?
Options- A. Gases
- B. Vaccum
- C. Liquids
- D. Solids Discuss
Physics problems
Search Results
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: 0
Explanation:
No work done as there is no external external pressure in free expansion.
Hence, Work done in a free expansion process is Zero.
Correct Answer: homogeneous
Explanation:
A Mixture is a material made up of two or more different substances which are mixed.
Mixtures can be either homogeneous or heterogeneous.
* A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.
* A heterogeneous mixture is a type of mixture in which the components can be seen, as there are two or more phases present.
Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances.
Correct Answer: 210 kN/mm2
Correct Answer: Frequency
Correct Answer: for cleaning procedures
Correct Answer: energy can neither be created nor destroyed
Explanation:
The 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.
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.
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