Gujarat Board Class 11 Physics Sample Papers 2007

Sample Paper – 2007
Class – XI
Physics
                                                                                                                
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.

1.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?

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.If the diameter of the earth becomes twice its present value, mass remaining same, how would the weight of a body placed on the earth’s surface change?

5.A bend in a level road has a radius of 100m. Find the maximum speed which a car turning this bend may have without skidding, if the coefficient of friction between the tyres and road is 0.8?

6.When a body starting from rest accelerates by at, what is the velocity after time t ?

7.What is the angle between two forces of 2N and 4N having resultant as 4N?

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?

9 . A simple harmonic wave is represented by the equation :
y = 10 sin ( 20t + 0.5 ), where y is in m and t is in s, find its amplitude, angular frequency, frequency and initial phase.

10.Plot the stress versus strain graph for a stretched wire.

11.List any four postulates of the kinetic theory of gases.

12.Plot a graph showing the Carnot’s Cycle.

13.Density of a material in cgs system is 8 g cm-3. What is its density in another system where unit of length is 5 cm and unit of mass is 20g ?

14.Discuss four methods of reducing friction.

15.State the first law of thermodynamics and apply it to derive the Mayor’s Formula.

16.What is the physical meaning of the term ‘Angular Momentum’. Derive its expression in polar coordinates.

17.A body of a mass 100 kg falls on the earth from infinity. What will be its velocity and energy on reaching the earth? Radius of earth is 6400 km.

18.State the Pascal’s law and apply it to explain the working of Hydraulic brakes.

19.Calculate the number of  ‘Degree of freedom’:

 (a)         diatomic gas                                and                (b)         triatomic gas

20.What do you mean by the term ‘Elastic Collision’.

Write the expression for the final velocities of two bodies undergoing one dimensional elastic collision. Hence explain what happens when:

(a)two colliding bodies have the same mass and
(b)a very big body collides with  a very small body.

21.A bullet of mass 0.012kg and horizontal speed 70 ms-1 strikes a block of wood of mass 0.4kg and instantly comes to rest with respect to the block. The block is suspended from the ceiling by means of thin wires. Calculate the height to which the block rises. Estimate the heat produced in the process.