Test Physical quantities 11th physics

[PHYSICAL QUANTITIES , MEASUREMENT DIMENSIONS]

Test questions : Physics  11^th class

1. Filling the blanks:

(i)                  3.0m/s² = ______Km/hr²

(ii)                6.67 x 10^-11 Nm²/Kg² = __________g^-1cm³s^-2

2. Write SI units of thermodynamic temperature, electric current, amount of substance and luminous intensity.

3. Two resistance

 R₁ = 200 + 4 Ω

 R₂ = 300 + 6 Ω

are connected in series. Then what is the equivalent resistance.

4. If velocity, time and force were chosen E=mv² the basic quantities, find the dimensions of mass.

5. The velocity v of wave depend on their wavelength λ density of water ρ and the acceleration due to gravity g. Find relation between these quantities by the method of dimension?

6. The force acting on an object of mass (m) traveling at velocity (v) in a circle of radius (r) is given by

F=mv²/r

            The measurements recorded as m [m= 3.5Kg + 0.1Kg]

            v = 20m/s + 1m/s

            r = 12.5m + 0.5m

            Find the maximum possible

(i)                  fractional error

(ii)                % error in the measurement of force

(iii)               What is the recorded reading

7. What is the difference between A⁰ and AU?

8. Give two methods for measuring time intervals?

9. E , m, l and G denote energy, mass, angular momentum and gravitational constant respectively. Determine the dimensions of El²/m⁵G²

10. State which of the following are dimensionally correct

(i)                  Pressure = Energy per unit volume

(ii)                Pressure = momentum x volume x time

11. The density of cylindrical rod was measured by

ρ =4m/ ПD²l

            The percentage error in m, D, l are 1%, 1.% and 0.5%. Calculate % error in the

 calculated value of density.