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- Question
Change in focal length of eye lens is caused by
Options- A. ciliary muscles
- B. iris
- C. pupil
- D. retina
- Correct Answer
- ciliary muscles
- 1. 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
- 2. 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
- 3. 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
- 4. An ideal gas cannot be
Options- A. liquified
- B. solidified
- C. Both A & B
- D. None of the above Discuss
- 5. Slip rings are usually made of
Options- A. Aluminium
- B. Copper
- C. Phosphor Bronze
- D. Carbon Discuss
- 6. Electromagnetic waves are transverse in nature is evident by
Options- A. Reflection
- B. Polarisation
- C. interference
- D. Diffraction Discuss
- 7. 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
- 8. Forces of attraction limit the motion of particles most in solids.
Options- A. TRUE
- B. FALSE Discuss
- 9. 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
- 10. A tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 110 feet per second. After how many seconds does the ball attain its maximum height?
Options- A. 2.87 sec
- B. 3.44 sec
- C. 4.65 sec
- D. 5.41 sec Discuss
Physics problems
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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: 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: 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.
Correct Answer: 3.44 sec
Explanation:
It is launched vertically with an initial speed of 110 ft/sec.
It will reach maximum height when the speed drops to 0.
Vo=110 feet per second
ho=2 feet
So, h(t) = -16t^2 +110t +2
Take the derivative: h'(t) = 110 -32t
The maximum height will be at the inflection when the derivative crosses the x-axis, then h'(t)=0.
So, set h'(t)=0 and solve for t:
0 = 110 -32t
-110 = -32t
t=3.4375
t=3.44 seconds.
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