Physics problems
- 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 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer
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.
- 2. 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 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
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.
- 3. Change in focal length of eye lens is caused by
Options- A. ciliary muscles
- B. iris
- C. pupil
- D. retina Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: ciliary muscles
- 4. Electromagnetic waves are transverse in nature is evident by
Options- A. Reflection
- B. Polarisation
- C. interference
- D. Diffraction Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Polarisation
- 5. 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 Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: the wavelength of the electrons must be close to the diameter of the object
- 6. Forces of attraction limit the motion of particles most in solids.
Options- A. TRUE
- B. FALSE Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
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.
- 7. 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 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
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.
- 8. 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 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
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.
- 9. In beta decay what is emitted
Options- A. electron
- B. proton
- C. neutron
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: electron
- 10. A machine powered by rotating blades is a
Options- A. Fumerole
- B. Turbines
- C. Solar panel
- D. None of the above Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Turbines
Explanation:
Turbines are machines powered by rotating blades.
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