Physics problems
- 1. If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
Options- A. Concave
- B. Convex
- C. Cylindrical
- D. Plane Also asked in: Bank Exams
Correct Answer: Concave
- 2. Soap bubble attains spherical shape due to ______.
Options- A. inertia
- B. pressure
- C. surface tension
- D. Viscosity Also asked in: Bank Exams
Correct Answer: surface tension
- 3. 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 Also asked in: Bank Exams
Correct Answer: 500 nm only
Explanation:
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.
- 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 Also asked in: Bank Exams
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
- 5. 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 Also asked in: Bank Exams
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.
- 6. Electric Motor converts _____ energy to mechanical energy
Options- A. sound
- B. mechanical
- C. chemical
- D. electrical Also asked in: Bank Exams
Correct Answer: electrical
- 7. What is the SI unit of intensity of sound?
Options- A. Decible
- B. Newton
- C. Heartz
- D. Tesla Also asked in: Bank Exams
Correct Answer: Decible
- 8. 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 Also asked in: AIEEE, Bank Exams
Correct Answer: Energy
- 9. 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 Also asked in: Bank Exams
Correct Answer: Friction
- 10. Friction is caused by the ______________ on the two surfaces in contact.
Options- A. irregularities
- B. smoothness
- C. densities
- D. gaps Also asked in: Bank Exams
Correct Answer: irregularities
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