Sample Paper – 2006

Class – XI

Physics

MM:70                                     SEF-06-01

General Instructions:

i.             All questions are compulsory.

ii.           There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and one question of five marks. You have to attempt only one of the choices in such questions.

iii.          Question numbers 1 to 5 are very short answer questions, carrying one mark each.

iv.          Question numbers 6 to 12 are short answer questions, carrying two marks each.

v.            Question numbers 13 to 24 are short answer questions, carrying three marks each.

vi.          Question number 25 to 27 are long answer questions, carrying 5 marks each

vii.        Use of calculators is not permitted. However, you may use log tables if necessary.

viii.       You may use the following values of physical constants wherever necessary :

c   = 3  x 10 ⁸ ms ^–1

h   = 6.6 x 10 ^–34 Js

e   = 1.6 x 10 ^–19 C

m ₀ = 4p  x 10 ^–7 T m A^-1

1.           For an oscillatory motion, how much is the displacement between maximum potential energy position and maximum kinetic energy position?

2.           A body of mass 2 kg is initially at rest. A constant force of 5 N acts on it for 10 s. How much is the average power acting?

3.           A ring of radius r  and mass m rotates about an axis passing through its center and perpendicular to the plane with angular velocity w.How much is its kinetic energy?

4.           The distance of two planets from the sun are 10¹¹ and 10¹⁰ meter respectively. What is the ratio of time periods of these two planets?

5.           When a body accelerates by at, what is the velocity after time t, when it starts from rest?

6.   The length and breadth of a rectangle are 25.2 cm and 16.8 cm, which have been measured to an accuracy of 0.1 cm. Find the area of the rectangle.

7.           A 40 kg shell is flying at a speed of 72 km h^-1. It explodes into two pieces, one piece  of 15kg stops. Calculate the velocity of the other piecec.

8.           Two bodies of masses 0.5 kg and 1 kg are lying in XY plane at ( -1, 2) and (3,4) respectively. What are the coordinates of the center of mass?

1.       If a body is projected with velocity v, greater than escape velocity v_e from the            surface of the earth, find its velocity in interstellar space.

10.        What do you mean by the terms : root mean square speed and  most probable speed?

11.        The displacement y ( in cm ) is given by the relation y = 3 sin 314 t + 4 sin 314 t, how much is the frequency of the SHM ?

12.        Discuss four methods of reducing friction.

13.        The value of G in cgs is 6.67 x 10 ^–8 dyne cm² g^-2. Calculate its value in SI units.

A particle moves in a circle of radius 4.0 cm clock wise at constant speed of 2 cm s^-1. If    and  are the unit acceleration vectors along x axis and y axis respectively, find the acceleration of he particle at e instant half way between  PQ. 

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