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General Science -Physics

General Science -Physics GK Questions

Multiple choice questions on General Science -Physics for General Studies and GK preparation of SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations.

Practice MCQ Questions

1. Noise is measured in which unit?

(a) Watt

(b) Faraday

(d) Decibel

Answer: (d) Decibel

2. The SI unit of electric charge is?

(a) Volt

(b) Ohm

(d) Watt

Answer: (c) Coulomb

3. For what is Mohs scale used?

(a) To measure brightness of a substance

(b) To measure viscosity of a liquid

(d) To measure hardness of minerals

Answer: (d) To measure hardness of minerals

4. An anemometer measures which of the following?

(a) Speed of light

(b) Speed of wind

(d) Speed of satellites

Answer: (b) Speed of wind

5. Humidity of air is measured by………..

(a) Hygrometer

(b) Nanometer

(d) Barometer

Answer: (a) Hygrometer

6. The mass of an object……….

(a) changes from place to place

(b) remains same everywhere

(d) is greater at mountains

Answer: (b) remains same everywhere

7. Newton's first law is also known as ..........

(a) Law of friction

(b) Law of moments

(d) Law of motion

Answer: (c) Law of Inertia

8. Rocket propulsion technology works on the following scientific principles?

(a) Laws of reflection of sound

(b) Newton's law of motion

(d) Law of conservation of mass

Answer: (b) Newton's law of motion

9. If a ball is thrown up, which of the following does not change?

(a) Acceleration

(b) Speed

(d) Distance

Answer: (a) Acceleration

10. Acceleration is

(a) Inversely proportional to force

(b) Inversely proportional to mass

(d) Directly proportional to force

Answer: (b) Inversely proportional to mass

11. We are able to walk on earth without slipping because of

(a) Gravitational force

(b) Frictional force

(d) Centrifugal force

Answer: (b) Frictional force

12. Work done by centripetal force is………

(a) positive

(b) zero

(d) unity

Answer: (b) zero

13. The spring balance works on the principle of…………

(a) Boyle’s Law

(b) Hooke’s Law

(d) Pascal’s Law

Answer: (b) Hooke’s Law

14. What is the reason for the oil rising in the lamp wick?

(a) Capillary action

(b) Diffusion of oil through wick

(d) Surface tension

Answer: (a) Capillary action

15. In a streamline flow,………at every point in the fluid remains same.

(a) force

(b) pressure

(d) speed

Answer: (c) velocity

16. At hill stations, the boiling point of water will be

(a) Same as at sea level

(b) less than that at sea level

(d) equal to the melting point of ice

Answer: (b) less than that at sea level

17. Why does the boiling point of water decrease at high altitudes?

(a) Because of high temperature

(b) Because of low atmospheric pressure

(d) Because of high atmospheric pressure

Answer: (b) Because of low atmospheric pressure

18. Why does a fountain pen leak in an airplane flying at a height?

(a) Because of reduced viscosity of the ink in the pen

(b) Because of increased viscosity of the ink in the pen

(d) Because of lower atmospheric pressure outside the pen

Answer: (d) Because of lower atmospheric pressure outside the pen

19. A fresh egg when placed in salt water will

(a) Sink and go to the bottom

(b) Sink but will not go to the bottom

(d) Burst

Answer: (c) Float

20. Density of water is maximum at………..

(a) 12 degrees Celsius

(b) 8 degrees Celsius

(d) 0 degrees Celsius

Answer: (c) 4 degrees Celsius

21. Density of water…………when it freezes.

(a) decreases

(b) increases

(d) No option is correct.

Answer: (a) decreases

22. At the boiling point of liquids, its

(a) Temperature increases

(b) Atmospheric Pressure increases

(d) Vapour Pressure decreases

Answer: (c) Temperature remains constant

23. Cryogenics is a branch of Physics that deals with .....

(a) very high temperatures

(b) very low temperatures

(d) growth of extremely large crystals

Answer: (b) very low temperatures

24. Which of the following is one of the metals used in LED semiconductor technology?

(a) Copper

(b) Gallium

(d) Zinc

Answer: (b) Gallium

25. The sun provides heat to the earth through:

(a) convection

(b) conduction

(d) fission

Answer: (c) radiation

26. Food is cooked faster in the pressure cooker due to:

(a) heat remaining inside

(b) increase in the boiling point of water

(d) high amount of steam

Answer: (b) increase in the boiling point of water

27. Which one of the following is an insulator?

(a) Copper

(b) Wood

(d) Aluminium

Answer: (b) Wood

28. A wooden spoon is dipped in a cup of ice cream. Its other end will………

(a) become cold by the process of conduction

(b) become cold by the process of convection

(d) not become cold

Answer: (d) not become cold

29. Heat, in ....... is a type of energy transfer from a warmer substance to a colder one.

(a) Gravity

(b) Friction

(d) Magnet

Answer: (c) Thermodynamics

30. Two bodies are in Thermal equilibrium, if they are the same ______.

(a) Temperature

(b) Amount of heat

(d) Velocity

Answer: (a) Temperature

31. Which one among the following is not an electro–magnetic wave?

(a) X–Ray

(b) R–Ray

(d) Infrared Ray

Answer: (c) Cathode Ray

32. TV remote controls work on the principle of.....

(a) Ultrasonic waves

(b) Laser technology

(d) Infrared waves

Answer: (d) Infrared waves

33. Wavelength of Infrared waves is smaller than..........

(a) Visible light

(b) Ultraviolet rays

(d) Radio waves

Answer: (d) Radio waves

34. Sound cannot travel in which of the following medium?

(a) Solid

(b) Liquid

(d) Vacuum

Answer: (d) Vacuum

35. Stethoscope works on which principle?

(a) Conversion of current into sound

(b) Conversion of sound into current

(d) Reflection of light

Answer: (c) Reflection of sound

36. Sound travels fastest in...........

(a) Petrol

(b) Steel

(d) Kerosene oil

Answer: (b) Steel

37. Human being's hearing range is --------

(a) 50 to 50,000 Hz

(b) 40 to 40,000 Hz

(d) 20 to 20,000 Hz

Answer: (d) 20 to 20,000 Hz

38. What is the velocity of sound in air?

(a) 343 m/sec

(b) 220 m/sec

(d) 110 m/sec

Answer: (a) 343 m/sec

39. When the speed of an object exceeds the speed of sound, it is said to be traveling at the speed of-

(a) Supersonic

(b) Infrasonic

(d) Subsonic

Answer: (a) Supersonic

40. Light waves are…….

(a) Electric waves

(b) Magnetic waves

(d) No option is correct

Answer: (c) Electromagnetic waves

41. Scattering of a beam of light by a medium containing small suspended particles is known as:

(a) Magnus effect

(b) Malter effect

(d) Threshold effect

Answer: (c) Tyndall effect

42. The brilliant red color of the rising and setting sun is due to the ______ of light.

(a) Scattering

(b) Absorption

(d) Dispersion

Answer: (a) Scattering

43. In which of the following mirrors, the size of the image formed is always equal to the size of the object?

(a) Convex mirror

(b) Concave mirror

(d) Both convex and concave mirror

Answer: (c) Plane mirror

44. What kind of mirror would be best suited for use in a solar cooker?

(a) Concave

(b) Convex

(d) No option is correct

Answer: (a) Concave

45. The image formed by a plane mirror is always ––––––– ?

(a) Virtual and erect

(b) Real and erect

(d) Virtual and inverted

Answer: (a) Virtual and erect

46. Which one of the following processes is responsible for the glittering of an air bubble rising through water?

(a) Reflection of light

(b) Refraction of light

(d) Scattering of light

Answer: (c) Total internal reflection of light

47. The power of a lens is -2.0 D. Here 'D' stands for:

(a) Dilation

(b) Distance

(d) Degree

Answer: (c) Dioptre

48. Rajat has hypermetropia. What type of lens will the ophthalmologist recommend to correct his vision?

(a) Convex

(b) Concave

(d) Progressive

Answer: (a) Convex

49. Splitting of light into different colors is called…?

(a) Separation

(b) Inversion

(d) Reflection

Answer: (c) Dispersion

50. Which of the following is not a good conductor of electricity?

(a) Soil

(b) Diamond

(d) Gold

Answer: (b) Diamond

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