Physics questions with answers

2,629 multiple-choice questions. Open any question for its answer and explanation.

Questions asked in State PSC and UPSC prelims, by topic. Each topic also has notes to read.

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1. Soap solution used for cleaning purpose appears cloudy. This is due to the fact that soap micelles canAsked in UPSC CDS 2 2019 · Horticulture Development Officer(HDO) 2018
2. Ball pen functions on the principle ofAsked in TOURIST INFORMATION OFFICER(TIO) 2017
3. Which one of the following combinations of source and screen would produce sharpest shadow of an opaque object?Asked in UPSC CDS 2 2020
4. Diffusion of light in the atmosphere takes place due to :Asked in HPPSC HPAS Prelims 2013 · UPPCS Prelims 2003
5. वा™ुमण्डल में प्रकाश का ͪवसिरण ͩकसि कारण होता है ?Asked in HPPSC HPAS Prelims 2013
6. When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of :Asked in HPPSC HPAS Prelims 2014 · UPPCS Prelims 2000
7. Which one of the following wavelengths corresponds to the wavelength of X-rays?Asked in UPSC NDA 2 2022
8. Tyndall effect appears due to which one of the following properties of light?Asked in UPSC CISF AC EXE 2020
9. The blue colour of the sky and the reddening of the Sun at sunrise and sunset are caused due to the phenomenon of :Asked in UPSC CISF AC EXE 2022
10. The spectrum of color in Compact Disc (CD) is due toAsked in WBPSC CS Prelims 2021
11. Which one of the following is used for determining the structure of crystal:Asked in RPSC RAS Prelims 1998
12. Consider the following statements : (i) Optical fibre communication is based on the principle of refraction of light. (ii) Optical fibre communication is based on the principle of total internal reflection of light. (iii) In optical fibre communication, light is the carrier wave. (iv) Optical fibre permits communication over short distances only. Select the correct statement(s) using the codes given below.Asked in APSC CCE Prelims Exam 2022
13. A photoelectric cell is a device whichAsked in BPSC Prelims Exam 69th
14. Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path becauseAsked in UPSC NDA 2 2019
15. Which one of the following phenomenon is used in optical fibres?Asked in UPPSC Upper Mains 2015
16. Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon ofAsked in UPPCS Prelims 1999
17. Which one of the following does a TV remote control unit use to operate a TV set?Asked in UPPCS Prelims 2000
18. In fiber optics communication the signal travels in the form of:Asked in RPSC RAS Prelims 2012
19. In One of the followings infra red light is not used. This isAsked in law officier 2025
20. Which of the following is used to take 3- dimen-sional pictures?Asked in UPPSC Upper Mains 2008
21. Method for recording three dimension photograph using laser beam is:Asked in RPSC RAS Prelims 1996
22. When a soap film on the water is seen in the daytime, it shows beautiful colours. This phenomenon is due toAsked in BPSC Prelims Exam 67th Cancelled
23. On a rainy day, small oil films on water show brilliant colours. This is due toAsked in GPSC Prelims CSP 2 2023
24. In Fresnel's Biprism, the value of wavelength (λ) depends uponAsked in MPSC CS Prelims 2018
25. Two parallel slits 1 millimetre apart are placed 1 metre away from the screen. What is the fringe separation due to interference effect, when a beam of wavelength 500 nanometres is incident on them ?Asked in MPSC CS Prelims 2018