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- Question
Heat transfer by radiation mainly depends upon
Options- A. Kind and extent of its surface
- B. Its temperature
- C. Nature of the body
- D. All of the above
- Correct Answer
- All of the above
ExplanationHeat transfer through radiation takes place in form of electromagnetic waves mainly in the infrared region. It depends on nature of the body, its temperature and kind & extent of its surface.
- 1. Land is considered a resource because it
Options- A. is used to produce things
- B. requires labor to be useful
- C. is always available to use
- D. costs little or nothing to use Discuss
- 2. Which of these is true of all simple machines?
Options- A. these make work easier
- B. work input > work output
- C. Both A & B
- D. None of the above Discuss
- 3. An ideal gas cannot be
Options- A. liquified
- B. solidified
- C. Both A & B
- D. None of the above Discuss
- 4. Slip rings are usually made of
Options- A. Aluminium
- B. Copper
- C. Phosphor Bronze
- D. Carbon Discuss
- 5. 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
- 6. Change in focal length of eye lens is caused by
Options- A. ciliary muscles
- B. iris
- C. pupil
- D. retina Discuss
- 7. Electromagnetic waves are transverse in nature is evident by
Options- A. Reflection
- B. Polarisation
- C. interference
- D. Diffraction Discuss
- 8. To resolve an object in an electron microscope,
Options- A. the wavelength of the electrons must be close to the diameter of the object
- B. the wavelength of the electrons must be greater than the diameter of the object.
- C. Both A & B
- D. None of the above Discuss
- 9. Forces of attraction limit the motion of particles most in solids.
Options- A. TRUE
- B. FALSE Discuss
- 10. Which must be true for metamorphism to occur?
Options- A. The grain size must become smaller
- B. The process must take place underwater
- C. The parent rock must be in solid form
- D. The parent rock must be igneous Discuss
Physics problems
Search Results
Correct Answer: is used to produce things
Explanation:
Land is considered as an important resource because it is useful in producing many things. For example, in agriculture, land is used for cultivating the crop, in industrial use, it is used for constructing factories and to make products that we use.
Correct Answer: Both A & B
Correct Answer: liquified
Explanation:
An ideal gas cannot be liquified because forces between the molecules are negligible.
Correct Answer: Phosphor Bronze
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: ciliary muscles
Correct Answer: Polarisation
Correct Answer: the wavelength of the electrons must be close to the diameter of the object
Correct Answer: TRUE
Explanation:
We know that, solids have definite shapes and definite volumes, whereas liquids have definite volumes but indefinite shapes and coming to gases it has indefinite volumes and indefinite shapes.
Hence, only in solids, the forces of attraction limit the motion of particles.
Correct Answer: The parent rock must be in solid form
Explanation:
Metamorphism is the method of changing the structure of a rock by using heat and temperature.
Hence, for this to happen the parent rock must be in solid form only. Therefore, option C) is true.
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