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.