Among the following elementary particles , which one is never decays in free space?

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• The temperature of a gas of initial volume V1 in a glass container is increased from T1=200 K to T2=800 K. The new volume is V2, which equation is correct?
  • (A) V₁=V₂/2
  • (B) V₁=2V₂
  • (C) V₁=4V₂
  • (D) V₁=V₂/4
  ►Correct Option
  
  Correct Option is: D
  

• Specific heat of a substance A is greater than that of substance B. The masses are the same. If equal amount of energy is carried out by heat to both these substances, the one reaching the higher temperature (assuming no melting freezing or evaporation occur) is?
  • (A) There will be no difference in the final temperature
  • (B) Substance A
  • (C) Substance B
  • (D) Could be either A or B
  ►Correct Option
  
  Correct Option is: C
  

• For coherence two light sources must have?
  • (A) Same Wavelength and be in phase
  • (B) Be in phase and have same wavelength
  • (C) Be in phase, have same wavelength and same frequency
  • (D) None of the above
  ►Correct Option
  
  Correct Option is: C
  

• Equal charge q1 and q2 (q1=q2) are separated by 2m. The force between them is F=9 N. What are the charges?
  • (A) 63.00µC
  • (B) 6.30µC
  • (C) 0.63µC
  • (D) 0.063µC
  ►Correct Option
  
  Correct Option is: A
  

• A truck of mass 750 Kg moving at 30 km/h hits a stationary dumpster of mass 1000 Kg. The two vehicles stick and move together after the collision. What is their speed?
  • (A) 1.20 Km/h
  • (B) 12.85 Km/h
  • (C) 41.66 Km/h
  • (D) Zero Km/h
  ►Correct Option
  
  Correct Option is: B
  

• A car of mass 1000 Kg was brought to rest on a level road by braking and 500 KJ of heat were produced. Find the speed of the vehicle just before the brakes were applied?
  • (A) 31.62 m/s
  • (B) 63.24 m/s
  • (C) 632.4 m/s
  • (D) 22.36 m/s
  ►Correct Option
  
  Correct Option is: A
  

• Here users will find all the physics Mcqs. Mechanics, Thermodynamics, Photonics, study of heat, Distance, work, force, time, machines, study of electricity, magnetism, law of motion, nuclear physics, Quantum, relativity, solar system, and all the topics will be covered in the physics mcqs section.
  • (A) A
  • (B) A/2
  • (C) 2A
  • (D) 4A
  ►Correct Option
  
  Correct Option is: D
  

• At what temperature will the resistance of a copper wire becomes three times its value at 0 degree centigrade? Temperature coefficient of resistance of copper=4×10^-3 per C⁰?
  • (A) 500 C⁰
  • (B) 450 C⁰
  • (C) 400 C⁰
  • (D) 550 C⁰
  ►Correct Option
  
  Correct Option is: A