Quiz and MCQ on Physics
| Name | Quiz and MCQ on Physics for 12th Standard |
| Type | Multiple Choice Objective Questions |
Also read: Chemistry: Quiz and MCQ for 12th
Answer key after each 5th mcq
Question 01. A heater is designed to supply 115 volts. If the supply voltage is 100 V, what will be the percentage reduction in heat output??
(a). 10.2%.
(b). 8.1%.
(c). 8.6%.
(d). 7.6%.
Question 02. To which one of the following is the value of heat produced by a current flowing at an unchanged potential in a ‘R’ resistance wire proportional?
(a). 1/R↑2.
(b). 1/R.
(c). R.
(d). R↑2.
Question 03. The resistance of a conductor is 5 Ω at 5 °C and 6 Ω at 100 °C. What will be the resistance at 0°C?
(a). 1 Ω.
(b). 2 Ω.
(c). 3 Ω.
(d). 4 Ω.
Question 04. What does it mean to give a negative charge to an object?
(a). To take an electron from it.
(b). To give it an electron.
(c). To give ita proton.
(d). None of the above.
Question 05. The 29 μc and 80 μc charges are at a distance of 18 cm from each other. At what point on the line joining them will the field intensity be zero?
(a). 20 μc and distance of 6 cm.
(b). At middle.
(c). 80 μc and distance of 6 cm.
(d). No where.
MCQ on Physics
Question 06. what is the cause of magnetism in a magnet?
(a). Due to the rotational motion of the electron.
(b). Earth.
(c). The magnetic pressure exerted in the earth.
(d). Cosmic rays.
Question 07. The refractive index of water relative to air is 1.33. What will be the ratio of the speed of light in water and air?
(a). 2:3.
(b). 3:4.
(c). 1:3.
(d). 1:2.
Question 08. What is the change in temperature of a body in slow motion?
(a). It increases over time.
(b). It decreases over time.
(c). Does not change over time and it remains same on each point of a the body.
(d). Does not change over time but varies at different points of the body.
Question 09. It takes 15 minutes to heat some amount of water in an electric kettle from 0 °C to boiling point 100 °C. It takes 80 minutes to convert the full amount of water into vapor at 100 °C. What will be the latent heat of water?
(a). 533.3 calory per gram.
(b). 733.3 calory per gram.
(c). 433.3 calory per gram.
(d). 678.9 calory per gram.
Question 10. A load of 320 grams can be lifted by a machine by applying a load force of 50 grams. In doing this, the displacement of the point is usually 35 cm and the displacement of the load is 5 cm. What will be the efficiency of the machine?
(a). 80%.
(b). 91%.
(c). 95%.
(d). 81%.
Quiz on Physics
Question 11. What is the unit of magnetic torque?
(a). Ampere per square meter.
(b). Newton per ampere meter.
(c). Newton meter.
(d). Ampere square meter.
Question 12. The diameter of a hollow metal sphere is 20 cm. If there is a vacuum inside the sphere, what will be the air pressure on the outer surface of the sphere?
(a). 1126.3 kg load.
(b). 1264.9 kg load.
(c). 1432.9 kg load.
(d). 1298.2 kg load.
Question 13. The relative density of ice is 0.9 and that of sea water is 1.08. How much of a piece of ice will sink in sea water?
(a). 5/6.
(b). 4/2.
(c). 4/5.
(d). 5/8.
Question 14. How much heat is produced in a 210 watt electric bulb in 5 minutes?
(Mechanical equivalent of heat = 4.2 joules/calorie)
(a). 1500 calory.
(b). 15000 calory.
(c). 2250 calory.
(d). 22500 calory.
Question 15. A copper wire is stretched and its length is increased by 0.1%. What will be the percentage increase in the resistance of the wire?
(a). 1.0.
(b). 0.3.
(c). 0.4.
(d). 0.2.
12th Previous Year Questions physics
Question 16. Why is water a best solvent?
(a). Because its molecules are neutral.
(b). Because its molecules are highly polar.
(c). Because its molecules are non-polar.
(d). Because its molecules are anode.
Question 17. When the power of the lens of the eye increases, what is the visual impairments called?
(a). Myopia.
(b). Farsightedness.
(c). Blindness.
(d). None of the above.
Question 18. Why does it become a single mass when two pieces of ice are pressed together?
(a). The process generates heat.
(b). The process generates cold.
(c). Melting point decreases when the pressure increases.
(d). Melting point increases when the pressure increases.
Question 19. If the weight of an object in air is 92 grams, what will be its relative density?
(a). 4.1.
(b). 2.1.
(c). 3.1.
(d). 5.1.
Question 20. One end of a rod is heated. In which case the temperature remains same throughout the rod?
(a). K = 1.
(b). K = 0.
(c). K = 100.
(d). K = ∞.
Online Mock Test
Question 21. What does the speed of light in a vacuum depend on?
(a). Frequency.
(b). Wavelength.
(c). Speed of the source of light.
(d). None of the above.
Question 22. Effort P is applied to lift a load M in a machine. What will be the mechanical advantage of the machine?
(a). P/W.
(b). W/P.
(c). W × P.
(d). None of the above.
Question 23. What will be the caloric capacity of 40 g of aluminum metal whose specific heat is 0.2 cal/°C?
(a). 20 cal/°C.
(b). 15 cal/°C.
(c). 5 cal/°C.
(d). 8 cal/°C.
Question 24. If the radius of the earth is R and the acceleration due to gravity is at its floor, then what is the mean density of the earth?
(a). 4πG/3gR.
(b). 3gR/4πG.
(c). 3g/4πRG.
(d). πRG/12G.
Question 25. Of which is voltmeter a unit?
(a). E.
(b). V.
(c). F.
(d). C.
Physics 12th Objective Questions
Question 26. Which one of the following is the second law of Newton?
(a). “If two bodies exert forces on each other, these forces are equal in magnitude and opposite in direction”.
(b). “A body continues in its state of rest, or in uniform motion in a straight line, unless acted upon by a force”.
(c). “A body acted upon by a force moves in such a manner that the time rate of change of momentum equals the force”.
(d). None of the above.
Question 27. Who is the writer of “Philosophiae Naturalis Principia Mathematica”?
(a). Albert Einstein.
(b). Niels Bohr.
(c). Sir Isaac Newton.
(d). None of the above.
Question 28. Mathematically, how would you describe motion?
(a). In terms of displacement and distance.
(b). In terms of velocity and acceleration.
(c). In terms of speed and time.
(d). All of the above.
Question 29. What does velocity indicate?
(a). The rate of change of an object’s position.
(b). Speed of the object.
(c). Motion of the object.
(d). None of the above.
Question 30. Which is a type of motion?
(a). Reciprocal motion.
(b). Linear motion.
(c). Brownian motion.
(d). All of the above.
Board Question Physics
Question 31. A car moving in a straight line with a constant speed is an example of which motion?
a). Transitional motion.
(b). Oscillatory motion.
(c). Rational motion.
(d). None of the above.
Question 32. Ferris wheel is an example of which type of motion?
(a). Rolling motion.
(b). Reciprocal motion.
(c). Rotary motion.
(d). None of the above.
Question 33. In which year did Albert Einstein propose general theory of relativity?
(a). 1925.
(b). 1915.
(c). 1815.
(d). 1825.
Question 34. Which is true?
(a). Atomic number of oxygen is 10.
(b). Atomic number of helium is 6.
(c). Atomic number of oxygen is 1.
(d). Atomic number of nickel is 22.
Question 35. Which is the second law of thermodynamics?
(a). Heat does not spontaneously flow from a colder body to a hotter.
(b). As the temperature of a system approaches absolute zero, all processes cease.
(c). Both a and b.
(d). None of the above.
Also read: Quiz on Botany for 12th
References
35: Wilson H. A. (1966). Thermodynamics and Statistical Mechanics. Cambridge University Press, London, United Kingdom.