Chapter 1 Measurement MCQs
Question 1. What is the SI unit of temperature?
(1) Calorie
(2) Kelvin
(3) Centigrade
(4) None of the above
Answer: (2) Kelvin
Question 2. Which unit should be chosen to measure the distance between two stars?
(1) Kilometre
(2) Femtometre
(3) Lightyear
(4) None of the above
Answer: (3) Lightyear
Question 3. Which physical quantity has the dimension \(\left[\mathrm{LT}^{-2}\right]\)
(1) Velocity
(2) Acceleration
(3) Temperature
(4) None of the above
Answer: (2) Acceleration
Question 4. What is the unit of atomic weight?
(1) Gram
(2) Milligram
(3) No unit
(4) None of the above
Answer: (3) No unit.
Question 5. At what temperature density of water is maximum?
(1) 0°C
(2) 4°C
(3) 1K
(4) None of the above
Answer: (2) 4°C.
Question 6. Of the following quantities, which is a scalar quantity?
(1) Velocity
(2) Time
(3) Weight
(4) Force
Answer: (2) Time.
Question 7. The dimension of velocity is
(1)\(\left[\mathrm{LT}^{-1}\right]\)
(2) \(\left[\mathrm{LT}^{-2}\right]\)
(3)\(\left[\mathrm{ML}^{-1} \mathrm{~L}^{-2}\right]\)
(4)\(\left[\mathrm{MLT}^{-1}\right]\)
Answer: (1) \(\left[\mathrm{LT}^{-1}\right]\)
Question 8. Which one is not a fundamental unit?
(1) Metre
(2) Litre
(3) Kilogram
(4) Second
Answer: (2) Litre.
Question 9. A light year is a unit of
(1) Time
(2) Distance
(3) Temperature
(4) None of the above
Answer: (2) Distance.
Question 10. To measure the diameter of an atom, the unit used is
(1) Ohm 5
(2) Metre
(3) Fermi
(4) Millilitre
Answer: (3) Fermi
Question 11. 1 fermi is
(1) \(10^{-15}\) meter
(2) \(10^{-10}\) meter
(3) \(10^{-5}\) meter
(4) None of the above
Answer: (1) \(10^{-15}\)meter
Question 12. 1 X-unit is
(1) \(10^{-13}\)em
(2) \(10^{-12} \)em
(3) \(10^{-11}\)em
(4) None of the above
Answer: (3) \(10^{-11}\)em
Question 13. 1 light year is equal to
(1) 9.45 x \(10^{10}\) km
(2) 9.47 x \(10^{11}\)km
(3) 9.467 x \(10^{12}\)km
(4) None of the above
Answer: (3) 9.467 x\(10^{12}\) km.
Question 14. Which one is a scalar quantity?
(1) Acceleration
(2) Velocity
(3) Work
(4) None of the above
Answer: (3) Work.
Question 15. An object has a density of 4 g/c.c. and a volume 20 c.c. What will be the mass of the object?
(1) 80g
(2) 40g
(3) 5g
(4) None ofthe above
Answer: (1) 80g
Question 16. Identify the vector quantity
(1) Mass
(2) Volume
(3) Time
(4) Weight
Answer: (4) Weight.
Question 17. The unit of volume is a
(1) Fundamental unit
(2) Derived unit
(3) None of these
(4) None of the above
Answer: (2) Derived unit.
Question 18. The density of Hg is
(1) 13.6 g/c.c.
(2) 12.6 g/c.c.
(3) 11.6 g/c.c.
(4) None of the above
Answer: (1) 13.6 g/c.c.
Question 19. The watch used in running competitions is
(1) Pendulum clock
(2) Stop watch
(3) Table clock
(4) One of the above
Answer: (2) Stop watch.
Question 20. The dimension of Retardation is
(1)\( \left[\mathrm{LT}^{-1}\right]\)
(2)\( \left[\mathrm{LT}^{-2}\right]\)
(3)\( \left[\mathrm{LT}^{}\right]\)
(4) None of the above
Answer: (2)\( \left[\mathrm{LT}^{-2}\right]\)
Question 21. 1 parsec is
(1) 30:84 km
(2) 29:75 km
(3) 28:82 km
(4) None of the above
Answer: (1) 30:84 km
Question 22. 1 Astronomical Unit (AU) is
(1) 1.495 x\( 10^8 \)km
(2) 2:57 km
(3) 3:82 km
(4) None of the above
Answer: (4) 1.495 x\( 10^8 \) km.
Question 23. The dimension\(\left[\mathrm{MLT}^{-2}\right]\) corresponds to
(1) Pressure
(2) Momentum
(3) Force
(4) Energy
Answer: (4) Force
Question 24. SI unit of mass is
(1) Gram
(2) Kg
(3) Quintal
(4) Ton
Answer: (2) Kg
Question 25. SI unit of weight is
(1) Kg
(2) Dyne
(3) Newton
(4) Metre
Answer: (3) Newton
Question 26. Select the fundamental unit
(1) Litre
(2) Newt
(3) Ampere
(4) Coulomb
Answer: (3) Ampere
Question 27. The periodic time of a simple pendulum is proportional to the
(1) Its length
(2) Square root of its length
(3) Reciprocal of its length
(4) Square of its length
Answer: (2) Square root of its length
Question 28. The number of basic units in SI system is
(1) 7
(2) 6
(3) 5
(4) 4
Answer: (1) 7
Question 29. The prefix mega stands for
(1) \(10^9\)
(2) \(10^8\)
(3) \( 10^7\)
(4) \(10^6\)
Answer: (4)\( 10^6\)
Question 30. One liter stands for
(1) \(10^3 \mathrm{~m}^3\)
(2) \(10^{-3} \mathrm{~m}^3\)
(3) \(10^3 \mathrm{~m}^3\)
(4) \(10^3 \mathrm{~m}^3\)
Answer: (2) \(10^{-3} \mathrm{~m}^3\)
31. The dimension of force is
(1)\(\left[\mathrm{M^2LT}^2\right]\)
(2)\(\left[\mathrm{ML}^{-2} \mathrm{~T}^{-2}\right]\)
(3)\(\left[\mathrm{MLT}^2\right] \)
(4) \(\left[\mathrm{MLT}^{-2}\right] \)
Answer: (4)\(\left[ [\mathrm{MLT}^{-2}\right] \)
Question 32. Density is equal to Mass Volume
(1) Mass/Volume
(2) Volume/Mass
(3) Volume x Mass
(4) None of these
Answer: (1) Mass/Volume
Question 33. Newton is a
(1) Fundamental unit
(2) Derived unit
(3) Number
(4) None of these
Answer: (2) Derived unit
Question 34. \(10^{-6}\)m stands for
(1) Nanometer
(2) Mitron
(3) Femtometer
(4) Picometer
Answer: (2) Micron
Question 35. Light year indicates
(1) Time
(2) Distance
(3) A phenomenon of light energy
(4) None of the above
Answer: (2) Distance
Question 36. The unit used to measure the wavelength of visible light is usually
(1) \(10^{-15}\)m
(2) \(10^{-7}\)m
(3) \(10^{-9}\)m
(4) \(10^{-12}\)m
Answer: (3) \(10^{-9}\)m
Question 37. X-ray unit is
(1) \(10^{-3}\)m
(2) \(10^{-13}\)m
(3) \(10^{-6}\)m
(4) \(10^{-4}\)m
Answer: (2) \(10^{-13}\)m
Question 38. Atomic mass unit is used to express
(1) Absolute molecular mass
(2) Relative mass compared to the mass of hydrogen
(3) Comparison between the masses of carbon and oxygen
(4) None of the above
Answer: (1) Absolute molecular mass
Question 39. Dimension of plane angle is
(1) Radian
(2) Zero
(3) Steradian
(4) \(L^{-1}\)
Answer: (1) Zero
Question 40. The unit used to measure the distance between two planets is
(1) Kilometer
(2) Gigameter
(3) \(10^{15}\)m
(4) Lightyear
Answer: (1) Light year
Question 41. Candela is a
(1) Source of artificial light
(2) Unit of solid angle
(3) Unit of luminous intensity
(4) None of the these
Answer: (3) Unit of luminous intensity
Question 42. A physical quantity having magnitude but no dimension is
(1) A point
(2) Mechanical advantage
(3) Mole
(4) Ampere
Answer: (2) Mechanical advantage
Question 43. Dimension of frequency is
(1) \(\mathrm{LT}^{-1}\)
(2) \(\mathrm{T}^{-1}\)
(3)\( \mathrm{ML}^{-3}\)
(4)\(\mathrm{MLT}^2\)
Answer: (2) \(\mathrm{T}^{-1}\)
Question 44. If u = unit, n = magnitude, then the measure is
(1) n/u
(2) \(\mathrm{n}^2 u\)
(3) nu
(4)n+u
Answer: (3) nu
Question 45. Which one of the following is not a physical quantity?
(1) Mass
(2) Volume
(3) Pressure
(4) Length
Answer: (3) Pressure
Question 46. What is the dimensional formula of force?
(1)\(\left[\mathrm{M}^0{L} \mathrm{~T}^{-1}\right]\)
(2)\( \left[\mathrm{ML}\mathrm{~T}^{-2}\right]\)
(3) \(\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]\)
(4) \(\left[\mathrm{ML}^{-1} \mathrm{~T}^{-2}\right]\)
Answer: (2) \( \left[\mathrm{ML}\mathrm{~T}^{-2}\right]\)
Question 47. One astronomical (AU) is the average distance between
(1) The sun and moon
(2) The earth and the moon
(3) The earth and the sun
(4) None of these
Answer: (2) The earth and the sun
Question 48. What is the least count of a linear meter scale?
(1) 1cm
(2) 0.1 cm
(3) 0.01 cm
(4) 0.001 cm
Answer: (2) 0.1 cm
Question 49. 1 A is equal to
(1) \(10^{-6}\)m
(2) \(10^{-8}\)m
(3) \(10^{-10}\)m
(4) \(10^{8}\)m
Answer: (3)\(10^{-10}\)m
Question 50. Which one of the following is a fundamental/basic unit?
(1) Lightyear
(2) kg.m/s
(3) kg/m$
(4) Newton
Answer: (1) Lightyear
Question 51. Which one is a quantity with unit but without dimension?
(1) Pressure
(2) Velocity
(3) Solid angle
(4) Area
Answer: (3) Solid angle
Question 52. How many km are there in one light year?
(1) 9.46 x \(10^{15}\)
(2) 9.46 x \(10^{12}\)
(3) 9.46 x \(10^9\)
(4) 9.46 x \(10^6\)
Answer: (2) 9.46 x \(10^{12}\)
Question 53. Unit of temperature in SI system is
(1) °K
(2) K
(3) °F
(4) °C
Answer: (2) K