NEET Physics units and measurements Test-5

NEET Physics units and measurements Test-5

1. Out of the following the correct order of dimensions of mass increases is
a) Velocity
b) Power
c) Gravitational Constant


2. The correct order in which the dimensions of time decreases in the following physical quantities.
a) Power
b) Modulus of elasticity
c) Moment of inertia
d) Angular momentum


3. The time of oscillation of a small drop of liquid under surface tension depends upon density and surface tension s, as T ∝ pa sb rc, then the descending order of a, b and c is


4. Which of the following is the most precise device for measuring length.


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 — B
1. 2.01 sec — 2.56 sec
2. 2.10 sec — 2.55 sec
3. 1.98 sec — 2.57 sec


6. Fundamental unit out of the following is


7. Electron volt is the unit of


8. The unit of reduction factor of tangent galvanometer


9. The SI unit of magnetic permeability is


10. ML 2 T 2 I -2 is the dimensional formula for


11. Magnetic induction and magnetic flux differ in the dimensions of


12. Electromotive force and Electric potential differ in the dimensions of


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


14. Which of the following pairs is related as in work and force ?


15. The dimensional equation for magnetic flux is


16. The units and dimensions of impedance in terms of charge Q are


17. The dimensional formula of 1/2 ε0 E 2 is (ε o permittivity of free space and E electric field intensity)


18. Using mass (M), length (L), time (T) and electric current (A) as fundamental quantities the dimensions of permittivity will be


19. Dimensions of (1/με 0,where symbols have their usual meaning are


20. The correct order in which the dimensions of ‘Length’ increases in the following physical quantities is
a) Permittivity
b) Resistance
c) Magnetic permeability
d) Stress


21. (A): Plane angle has unit but no dimensional formula
(B): All dimension less quantities are unit less


22. Out of the following the dimensionless quantity is


23. Dimensional formulae are used
a) to convert one system of units into another
b) to find proportionality constants
c) to check the correctness of an equation


24. (A): The correctness of an equation is verified using the principle of homogeneity.
(B): All unit less quantities are dimensional less.


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.