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- Question
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
- Correct Answer
- Concave
- 1. What is the SI unit of electric current?
Options- A. Newton
- B. Joule
- C. Ampere
- D. Watt Discuss
- 2. What is the SI unit of frequency?
Options- A. Newton
- B. Watt
- C. Farad
- D. Hertz Discuss
- 3. Convex mirror is generally used in _____.
Options- A. solar cookers
- B. opthalmoscope
- C. reflector for head light
- D. rear view mirror Discuss
- 4. The reverse effect of X-ray emission is
Options- A. Raman effect
- B. Compton effect
- C. Zeeman effect
- D. Photo-electric effect Discuss
- 5. Which of the following represents a relation for ?heat lost = heat gained??
Options- A. Principle of thermal equilibrium
- B. Principle of colors
- C. Principle of calorimetry
- D. Principle of vaporization Discuss
- 6. Soap bubble attains spherical shape due to ______.
Options- A. inertia
- B. pressure
- C. surface tension
- D. Viscosity Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. Electric Motor converts _____ energy to mechanical energy
Options- A. sound
- B. mechanical
- C. chemical
- D. electrical Discuss
Physics problems
Search Results
Correct Answer: Ampere
Correct Answer: Hertz
Correct Answer: rear view mirror
Correct Answer: Photo-electric effect
Correct Answer: Principle of calorimetry
Explanation:
Heat lost by hot object = Heat gained by cold object
where we ignore heat gained or lost from/to the surroundings.
The study of heat gained and lost in this manner is often called Calorimetry.
Correct Answer: surface tension
Correct Answer: 500 nm only
Explanation:
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: 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: electrical
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