NEET Physics units and measurements Test-5 July 16, 2017admin0 Comments CategoriesNEET Foundation Class-VIII NEET Physics units and measurements Test-5 1. Out of the following the correct order of dimensions of mass increases is a) Velocityb) Power c) Gravitational Constant a, b, c c, a, b a, c, b b, c, a 2. The correct order in which the dimensions of time decreases in the following physical quantities. a) Powerb) Modulus of elasticityc) Moment of inertiad) Angular momentum a, b, d, e c, d, a, b a, c, d, b c, d, b, a 3. The time of oscillation of a small drop of liquid under surface tension depends upon density and surface tension s, as T ∝ p^{a} s^{b} r^{c}, then the descending order of a, b and c is a>b>c a>c>b b>a>c c>a>b 4. Which of the following is the most precise device for measuring length. a vernier callipers with 20 divisions on the sliding scale a screw gauge of pitch 1 mm and 100 divisions on the circular scale an optical instrument that can measure length to within a wavelength of light all the above 5. The time period of a seconds pendulum is measured repeatedly for three times by two stop watches A, B. If the readings are as follows S.No. A — B1. 2.01 sec — 2.56 sec2. 2.10 sec — 2.55 sec3. 1.98 sec — 2.57 sec A is more accurate but B is more precise B is more accurate but A is more precise A,B are equally precise A,B are equally accurate 6. Fundamental unit out of the following is ampere newton ohm weber 7. Electron volt is the unit of Power Potential Electron charge Energy 8. The unit of reduction factor of tangent galvanometer Ampere Gauss Radian None 9. The SI unit of magnetic permeability is Am^{ -1 } Am^{ -2} Hm^{ -1} Hm^{ -2} 10. ML^{ 2} T^{ 2} I^{ -2 } is the dimensional formula for Self inductance Magnetic induction Magnetic moment Electric conductance 11. Magnetic induction and magnetic flux differ in the dimensions of Mass Electric current length Time 12. Electromotive force and Electric potential differ in the dimensions of Mass Length Electric current none of the above 13. Let ε _{0} denote the dimensional formula of the permittivity of vacuum. If M – mass L = length, T – time and A = electric current, then ε _{ 0} =M^{ -1} L^{ 2} T^{ -1} A ε _{ 0} =M^{ -1} L^{ -3} T^{ 2} A ε _{ 0} =M^{ -1} L^{ -3} T^{ 4} A^{ 2} ε _{ 0} =M^{ -1} L^{ 2} T^{ -1} A^{ -2} 14. Which of the following pairs is related as in work and force ? 1 ) Electric potential and Electric intensity Momentum and velocity Impulse and force Resistance and voltage 15. The dimensional equation for magnetic flux is ML^{ 2} T^{ 2} I^{ -1 } ML^{ 2} T^{ -2 } I^{ -2} ML^{-2}T^{-2}I^{-1} ML^{– 2} T ^{ -2} I^{-2} 16. The units and dimensions of impedance in terms of charge Q are mho, ML^{ 2} T^{ -2} Q^{ -2} ohm, ML^{ 2} T^{ -1} Q^{ -2 } ohm, ML^{ 2} T^{ -2} Q ^{ -1} ohm, MLT^{-1}Q^{-1} 17. The dimensional formula of 1/2 ε_{0} E ^{2} is (ε _{o }permittivity of free space and E electric field intensity) ML^{ 2} T^{ -2} MLT^{ -2 } ML^{ -1} T^{ 2} ML ^{ 2} T^{ -1} 18. Using mass (M), length (L), time (T) and electric current (A) as fundamental quantities the dimensions of permittivity will be MLT^{ -1} A^{ -1 } MLT^{ -2} A^{ -2 } M^{ -1} T^{ -3} T^{ +4} A^{ 2} M^{ 2} L^{ -2} T^{ -2} A^{ 2} 19. Dimensions of (1/με_{ 0},where symbols have their usual meaning are L^{ -1} T L^{ 2} T^{ 2} L^{ 2} T^{ -2} LT^{-1} 20. The correct order in which the dimensions of ‘Length’ increases in the following physical quantities is a) Permittivityb) Resistance c) Magnetic permeability d) Stress a, b, c, d d, c, b, a a, d, c. b c, b, d, a 21. (A): Plane angle has unit but no dimensional formula (B): All dimension less quantities are unit less Both A&B are true Both A & B are false Only A is true Only B is true 22. Out of the following the dimensionless quantity is Angle strain Relative density all the above 23. Dimensional formulae are useda) to convert one system of units into anotherb) to find proportionality constantsc) to check the correctness of an equation only a &b are true only c is true a & c are true all the true 24. (A): The correctness of an equation is verified using the principle of homogeneity. (B): All unit less quantities are dimensional less. Both A & B are true Both A & B are false only A is true only B is true 25. (A): The value of dimensionless constants or proportionality constants cannot be found by dimensional methods. (B): The equations containing trigonometrically, exponential and logarithmic functions cannot be analysed by dimensional methods. Both A & B are true Both A & B are false only A is true only B is true Loading … Related posts: NEET Physics units and measurements Test-3 NEET Physics units and measurements Test-4 NEET Physics units and measurements Test-6 NEET Physics units and measurements Test-7 NEET Physics units and measurements Test-8 Powered by YARPP.