KENDRIYAVIDYALAYA SHIFT – I PATTOM

UNIT TEST I 2014-2015 Time :90 mts

CLASS XI PHYSICS Max Marks : 40

  1. What does the speedometer of a car indicate? (5x1=5)
  2. Name any two quantities which have same dimensions.
  3. Suggest a situation where the body has zero velocity and non zero acceleration.
  4. What are the SI units of Average velocity and instantaneous velocity?
  5. A car travelling at 36 Km/her applies breaks to reduce its speed to 18Km/hr in 2 seconds. Find the acceleration and retardation
  6. Check the correctness of the equations (a) y=a sin ωt2 (2) = u+ (2n-1) (5x2=10)
  7. The masses of two bodies are measured as m1= 20.1 Kg and m2=0.2 Kg. Find the difference between m1 and m2.
  8. Describe the parallax method to measure the distance from a planet to earth.
  9. The velocity of a particle depends upon t according to the equation v=a +bt+ c/(d+t) Write the dimensions of a b c and d
  10. What are fundamental and derived quantities Write one example each.
  11. The resistance R=V/I where V=(100+_ 5 volt and I= 10±0.2A Find the percentage error in R.
  12. What is uniform motion? Give the equation for velocity in uniform motion.
  13. What is meant by significant figures? Write the number of significant figures in (a) 1.0908 (b) 0.0062 (c) 0.4578 (d) 6291
  14. Discuss he motion of an object under free fall and draw (a) acceleration time graph (b) velocity time graph and position time graph for such a motion.
  15. A particle experiences constant acceleration for 20 s after starting from rest. If it travels a distance s1 ibn the first 10 s and distance s 2 in the next 10 second find the relation between s1 and s2. (5x3=15)
  16. Derive the equations for uniformly acceleratedmotion by graphical method. (2x5=10)
  17. Derive an expression for the frequency of oscillation of a string which may depend upon the tension T, mass per unit length m and length l. given that the constant of proportionality is k