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- Question
Rolling friction is caused by ____ from the following?
Options- A. Non-elastic effects
- B. Gravity
- C. Power dissipation
- D. Buoyancy
- Correct Answer
- Non-elastic effects
ExplanationRolling friction or rolling drag is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects, that is, not all the energy needed for deformation of the wheel, roadbed, etc... is recovered when the pressure is removed.
Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy.
- 1. Energy is continuously generated in the sun due to
Options- A. Nuclear fusion
- B. Nuclear fission
- C. Radioactivity
- D. Artificial radioactivity Discuss
- 2. When an electric bulb breaks , there is an explosive sound. That is due to
Options- A. the chemical reaction between the gases inside the bulb
- B. the compressed gases inside rushing out suddenly
- C. the air outside rushing in to fill the vacuum inside the bulb
- D. None of these Discuss
- 3. Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be
Options- A. 2
- B. 6
- C. 5
- D. 3 Discuss
- 4. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
Options- A. the pores in the pot are closed
- B. rain water stops oozing out from the pores
- C. the water that oozes out does not evaporate quickely because of the large percent age of moisture in the air
- D. surface of the pot becomes damp Discuss
- 5. As the object covers equal distances in equal intervals of time, it is said to be in ____________ motion.
Options- A. uniform
- B. linear
- C. translational
- D. equilibrium Discuss
- 6. On the Kelvin scale ,the melting point of ice is
Options- A. 373K
- B. 100K
- C. 273K
- D. 0 K Discuss
- 7. The wavelength of a wave is the distance between
Options- A. Crest and Trough
- B. Crest and Crest
- C. Trough and Trough
- D. Both B & C Discuss
- 8. An object at rest may have
Options- A. Momentum
- B. Potential energy
- C. Velocity
- D. Kinetic energy Discuss
- 9. Which of the following is a vector quantity
Options- A. momentum
- B. pressure
- C. Energy
- D. work Discuss
- 10. The Hydraulic Break works on the principle of _____ ?
Options- A. Pascal's Law
- B. Boyle's law
- C. Coulomb's law
- D. Bernouli's law Discuss
Physics problems
Search Results
Correct Answer: Nuclear fusion
Correct Answer: the air outside rushing in to fill the vacuum inside the bulb
Explanation:
The inside of the bulb being a vacuum, the outside air rushes in when the bulb is broken. The vibrations of the rushing air molecules produce the sound.
Correct Answer: 6
Explanation:
Number of spectral lines from a state n to ground state is
n(n-1)/2 = 6
Correct Answer: the water that oozes out does not evaporate quickely because of the large percent age of moisture in the air
Explanation:
To evaporate the water that oozes out, heat is required. Part of this heat is taken from the water inside which therefore become cool. Therefore (C) is correct. Here evaporation is less, so cooling too is less.
Correct Answer: uniform
Correct Answer: 273K
Correct Answer: Both B & C
Explanation:
Distance between two Consecutive Crests or two Consecutive Troughs is called Wavelength. But the distance between crest and adjacent trough is half the wavelength.
That is the distance between adjacent crest and trough is called Half the wavelength.
Correct Answer: Potential energy
Explanation:
An object at rest may have Potential energy.
Correct Answer: momentum
Correct Answer: Pascal's Law
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