CBSE Class - XI Physics (Set 4) Last year Paper (2015-16)

Time: 3 Hrs. M.M: 70

General Instructions:

Question 1 to 5 one mark.

1. Question 6 to 10 each two mark.
2. Question 11 to 22 each three mark.
3. Question 23 is value based question and carry four marks.
4. Questions 24 to 26 each five mark.

Section A

Find the dimensions of pressure.

1. A force of 10 N acts on a particle along a direction making an angle of 37° with the vertical. Find the component of the vertical direction.

3. A person travelling on a straight line with uniform velocity <math>v_i</math> for some time and <math>v_2</math> for next equal time. Find average velocity.

1. Mention the physical quantities, remain conserved in an inelastic collision?
2. Two spherical balls of mass M and radius R placed at distance a apart. Write expression for the force between them.

Section B

1. What is the heat associated with adiabatic process and what is the change in internal energy for isothermal process?
2. A ball is thrown vertically upwards. Draw its
3. velocity-time curve.
4. acceleration-time curve.
5. Estimate will be angle of projection of a projectile for which range R and maximum height H are equal.

9. Obtain the equation, <math>\omega = \omega_c \alpha t</math>. 1/5

0r

Why is the weight of a body at the poles more than the weight at the equator? Explain.

1. What is Kepler's law of periods? Express it mathematically.

Section C

1. (i) In van der Wiaal's equation

<math display="block">p + \left(\frac{a}{V^2}\right) | (V - b) = RT</math>

what are the dimensions of a and b?

where p is pressure, V is volume, T is temperature and R is gas constant.

1. Find the relative error in Z, if <math>Z = \frac{A^4B^{1/2}}{CD^{3/2}}</math>.
2. Two parallel rail tracks run North-South. Train A moves North with a speed of 54 km/h and train B moves South with a speed of 90 km/h. What is the
3. velocity of B w.r.t. A?
4. velocity of ground with respect to B?
5. velocity of a monkey running on the roof of the train A against its motion (with a velocity of 18 km/h w.r.t. the train A) as observed by a man standing on the ground?
6. A projectile is fired with speed u making an angle 0 with horizontally from the surface of the earth. Prove that the projectile will hit the surface of the earth with same speed and at the same angle.

1. A block of mass m is held against a rough vertical wall by pressing it with a finger. If the

coefficient of friction between the block and the wall is p, and the acceleration due to gravity is g, calculate the minimum force required to be applied by the finger to hold the block against the wall?

1. A railway car of mass 20 tonne moves with an initial speed of 54 km/h. On applying brakes, a constant negative acceleration of 0.3 m/s2 is produced.
2. What is the braking force action on the railway car?
3. In what time will it stop?
4. What distance will be covered by railway car before it finally stops?

Establish a relation between angular momentum and moment of inertia of a rigid body. Define moment of inertia in terms of it. 2/5