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- Question
When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?
Options- A. Energy
- B. Displacement
- C. Velocity
- D. Acceleration
- Correct Answer
- Energy
- 1. What is the SI unit of intensity of sound?
Options- A. Decible
- B. Newton
- C. Heartz
- D. Tesla Discuss
- 2. Electric Motor converts _____ energy to mechanical energy
Options- A. sound
- B. mechanical
- C. chemical
- D. electrical Discuss
- 3. The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is
Options- A. diffraction
- B. interference
- C. dispersion
- D. reflection Discuss
- 4. A copper wire of radius r and length lhas a resistance of R. A second copper wire with radius 2r and length lis taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
Options- A. 5 R
- B. 5 R/4
- C. 4 R/5
- D. R/5 Discuss
- 5. Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?
Options- A. 200 nm and 500 nm
- B. 500 nm and 1000 nm
- C. 500 nm only
- D. 200 nm and 1000 nm Discuss
- 6. A ball rolling along the ground gradually slows down and finally comes to rest is due to ________.
Options- A. Friction
- B. Magnetic force
- C. Electrostatic force
- D. Muscular force Discuss
- 7. Friction is caused by the ______________ on the two surfaces in contact.
Options- A. irregularities
- B. smoothness
- C. densities
- D. gaps Discuss
- 8. During _____________ motion of an object along a straight line, the velocity remains constant with time.
Options- A. linear
- B. translational
- C. uniform
- D. equilibrium Discuss
- 9. ___________ states that internal energy is a function of state and the increase in internal energy is equal to the sum of the heat supplied to system and work done by the system.
Options- A. First law of thermodynamics
- B. Hooke's Law
- C. The coulomb's law
- D. Faraday's Law Discuss
- 10. What is the direction of torque?
Options- A. Perpendicular to the direction of applied force
- B. Same as the direction of applied force
- C. Opposite to the direction of applied force
- D. Parallel to the radius Discuss
Physics problems
Search Results
Correct Answer: Decible
Correct Answer: electrical
Correct Answer: dispersion
Explanation:
A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets, present in the atmosphere. A rainbow is always formed in a direction opposite to that of the Sun. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrops.
Correct Answer: R/5
Explanation:
1st copper wire: R = pl/A = pl/ ?r2
2ndcopper wire: R? = p?l?/A? = pl/(4 ?r2) = R/4
If joined in parallel, (1/Req) = (1/R) + (1/R?)
= 1/R + 4/R1/Req= 5/R
Req= R/5
Correct Answer: 500 nm only
Explanation:
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.
Correct Answer: Friction
Correct Answer: irregularities
Correct Answer: uniform
Correct Answer: First law of thermodynamics
Correct Answer: Perpendicular to the direction of applied force
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