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# Physics MCQ Questions  with Answer for all Competitive Exams

Q31. A car is running on a road at a uniform speed of 60 km/h. The net resultant force on the car is:

(a) Driving force in the direction of car’s motion

(b) Resistance force opposite to the direction of car’s motion

(c) An inclined force

(d) Equal to zero

 Answer: (d)Explanation: By Newton’s second law F = ma. If a = 0, Fnet =0 Thus, the resultant force is zero.

Q32. What is the SI unit of Torque?

(a) Newton/meter

(b) Newton meter

(c) Newton second

(d) Newton/meter squared

 Answer: (b)Explanation: Torque = Force × perpendicular distance.SI unit of Torque will be = Newton meter

Q33. The transformer is used for –

(a) To increase the A.C. voltage

(b) To increase DC. Voltage

(c) To convert Electric Energy into heat energy

(d) To convert AC into DC.

 Answer: (a)Explanation: A transformer is a device that is used to increase or decrease the alternating current voltage.

Q34. Einstein got a noble prize for ​

(a)​ Photoelectric effect​ ​

(b) ​Compton effect ​

(c)​ Theory of relativity​

​(d)​ None of these

 Answer: (a)Explanation: ​When light shines on a metal electrons can be ejected from the surface of the metal in the phenomenon known as the photoelectric effect. Einstein received a noble prize for the discovery of the same. ​​While, Compton effect, discovered by Arthur Holly Compton, is the inelastic scattering of a photon by a charged particle, usually an electron. It results in a decrease in energy of the photon called the Compton Effect. ​​The theory of relativity determined that the laws of physics are the same for all non-accelerating observers.

Q35. What type of electromagnetic radiation is used in the remote control of a television? ​

(a) ​Infrared

​(b)​ Ultraviolet ​

(c)​ Visible ​

(d)​ None of these

 Answer: (a)Explanation: ​Infrared is used in the remote control of a television. It has a wavelength greater than visible light (> 800nm) which is invisible to the human eye but can be felt as heat.

Q36. An air bubble in water will act like a:

(a) Convex mirror

(b) Convex lens

(c) Concave mirror

(d) Concave lens

 Answer: (d)Explanation: Air bubble in water would act as a diverging lens because the Index of refraction of air is less than that of water.

Q37. Who discovered colour photography?

(a) Robert Noyce

(b) Enrico Fermi

(c) John Logie Baird

(d) James Clerk Maxwell

 Answer: (d)Explanation: The colour photography was discovered by James Clerk Maxwell in 1855. The first demonstration of colour photography by three colour method was suggested by him in 1855.

Q38. What is myopia?

(a) Inability to see distant objects clearly

(b) Abnormal functioning of the thyroid gland

(c) It is a condition of enlargement of the heart

(d) It is a kidney disorder

 Answer: (a)Explanation: Myopia is also known as Short-sightedness in which a person can see near objects clearly but cannot see distant objects distinctly.

Q39. The colour of light is determined by its

​(a)​ Amplitude ​

(b)​ Wavelength ​

(c) ​Intensity ​

(d)​ Velocity

 Answer: (b)Explanation: ​Light is made up of wavelengths of light, and each wavelength designates a particular colour. The colour of an object is the wavelengths of light that it reflects and colour we see is a result of which wavelengths are reflected back to our eyes.

Q40. ​If the motion of an object is represented by a straight line parallel to the time axis in a distance-time graph, then the object undergoes​​​

(a)​ An acceleration motion ​

(b)​ A decelerated motion ​

(c)​ A uniform non-zero velocity motion ​

(d) ​A zero velocity motion

 Answer: ​(d)​Explanation: The distance-time graph parallels to the time axis. ​​It is clear from the graph that the position of the object is not changing with the change in time, hence the object is at rest, or in other words, we can say that it is a zero velocity motion.

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