Physics MCQ Questions  with Answer for all Competitive Exams

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Physics MCQ Questions  with Answer

Q11. Meson was discovered by

​(a)​ Powell

​(b)​ Seaburg ​

(c)​ Anderson ​

(d)​ Yukawa

Answer: (a)

Explanation: ​Meson is sub-atomic particles composed of a quark and an antiquark. Its existence was theoretically predicted by Jakense physicist-Yukawa Hideki, but it was first discovered by English physicist civil Frank Powell in 1947 in cosmic-ray particle interactions. All mesons are unstable having lifetimes ranging from 10-8 to less than 10-22 seconds.

Q12. A ball is dropped from the top of a high budding with a constant acceleration of 9.8 misls. What will be its velocity after 2 seconds?

(a) 9.8 m/s

(b) 19.6 m/s

(c) 29.4 m/s

(d) 39.2 m/s

Answer: (b)

Explanation: The velocity after time I is given by v.

v = u + gt Here, u = 0, t = 2s, g = 9.8 m/s2

∴ v =0 +  (9.8 x 2) = 19.6 mils

 

Q13. Who invented the Centigrade scale?

(a) Anders Celsius

(b) Daniel Gabriel Fahrenheit

(c) William Thomson

(d) Wright Brothers

Answer: (a)

Explanation: The centigrade scale was invented by Swedish Astronomer Anders Celsius (1701-1744) has 100 degrees between the freezing point (0°C) and boiling point (100°C) of pure water at sea level air pressure.

Q14. ​If an apple is released from an orbiting spaceship, it will ​

(a)​ Fall towards the Earth ​

(b) ​Move at a slower speed ​

(c) ​Move along with the spaceship at the same speed ​

(d) ​Move at a higher speed

Answer: (c)​

Explanation: Due to the lack of gravitational force the apple so released will move at the same speed as the spaceship.

Q15. Cooling is not done by

​(a) ​Flow of water ​

(b) ​Release of compressed gas ​

(c)​ Burning cooking gas ​

(d) ​Melting the solid

Answer: (c)​

Explanation: Cooling is not done by burning cooking gas. While, the flow of water, the release of compressed gas, and melting solids result in cooling by absorbing heat from the surroundings, thus, lowering the temperature.

 

Q16. Ultraviolet radiations have more energy as compare to-

(a) Infrared Radiation

(b) Gamma Radiation

(c) X-Rays

(d) Space Rays

Answer: (a)

Explanation: Energy of E.M. radiation directly proportional to the frequency. The higher the frequency, the higher will be the energy. The order of energy for given options is:

Space rays > Gamma Radiation > X rays > UV rays > Infrared radiation.

Q17. A Rainbow is formed due to

(a) Refraction and Dispersion

(b) Scattering and Refraction

(c) Diffraction and Refraction

(d) Reflection and Refraction

Answer: (d)

Explanation: White light on getting dispersed in its seven constituent components undergo refraction and total internal reflection which results in the formation of a rainbow.

Q18. A hunter aims his gun at a point between the eyebrows of a monkey sitting on a branch of a tree. Lust as he fires, the monkey Jumps down. The bullet will:

(a) Hit the monkey at the point aimed

(b) Hit the monkey below the point aimed

(c) Hit he monkey above the point aimed

(d) Miss the monkey altogether

Answer: (a)

Explanation: As monkey and bullet both fall under the same gravitational force, so the bullet will hit exactly the same point it has been aimed at.

Q19. Which one of the following liquids is a very good conductor of heat?

​(a)​ Mercury ​

(b) ​Water

​(c) ​Ether ​

(d)​ Benzene

Answer: (a) ​

Explanation: Mercury is a very good conductor of heat as it is the only liquid metal. It is used in thermometer also.

Q20. The retina of the eye is comparable to which of the following parts of a traditional camera? ​

(a)​ Film ​

(b) ​Lens ​

(c)​ Shutter ​

(d)​ Cover

Answer: (a)​

Explanation: Retina of the eye is comparable to the film of a traditional camera. The retina is a film of nerve fibers. The image of the object is formed at retina just like a camera film is used to see the images.

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