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- Question
Slip rings are usually made of
Options- A. Aluminium
- B. Copper
- C. Phosphor Bronze
- D. Carbon
- Correct Answer
- Phosphor Bronze
- 1. 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
- 2. For Gamma radiation, what stops its penetrating abilities?
Options- A. Lead
- B. Steal
- C. Concrete
- D. All of the above Discuss
- 3. Speed of sound is maximum in which among the following?
Options- A. Gases
- B. Vaccum
- C. Liquids
- D. Solids Discuss
- 4. 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
- 5. 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
- 6. An ideal gas cannot be
Options- A. liquified
- B. solidified
- C. Both A & B
- D. None of the above Discuss
- 7. 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
- 8. 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
- 9. 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 Discuss
- 10. Change in focal length of eye lens is caused by
Options- A. ciliary muscles
- B. iris
- C. pupil
- D. retina Discuss
Physics problems
Search Results
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: 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: 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 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: 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: liquified
Explanation:
An ideal gas cannot be liquified because forces between the molecules are negligible.
Correct Answer: Both A & B
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: All of the above
Explanation:
Heat 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.
Correct Answer: ciliary muscles
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