KENDRIYA VIDYALAYA PERAMBALUR
HALF YEARLY EXAMINATION -2016-17(MODEL PAPER)
CLASS: XI
MAXIMUM MARKS: 70
TIME ALLOTED: 3 HOURS
GENERAL INSTRUCTIONS:
1. ALL QUESTIONS ARE COMPULSORY.
2. THIS QUESTION PAPER HAS FIVE SECTIONS: SECTION A, SECTION B, SECTION C, SECTION D AND SECTION E.
3.SECTION A CONTAINS FIVE QUESTIONS OF ONE MARK EACH, SECTION B CONTAINS FIVE QUESTIONS OF TWO MARKS EACH,SECTION C CONTAINS TWELVE QUESTIONS OF THREE MARKS EACH,SECTION D CONTAINS ONE VALUE BASED QUESTION OF FOUR MARKS AND SECTION E CONTAINS THREE QUESTIONS OF FIVE MARKS EACH.
4. THERE IS NO OVERALL CHOICE.HOWEVER, INTERNAL CHOICE HAS BEEN PROVIDED IN ONE QUESTION OF TWO MARKS, ONE QUESTION OF THREE MARKS AND ALL THE QUESTIONS OF FIVE MARKS WEIGHTAGE.YOU HAVE TO ATTEMPT ONLY ONE OF THE CHOICES IN SUCH QUESTIONS.
5. USE OF CALCULATORS IS NOT PERMITTED.HOWEVER, YOU MAY USE THE LOG TABLES IF NECESSARY.
SECTION -A
1. Can a particle accelerate when its speed is constant?
2. Is the relation F=ma applicable to the motion of the rocket.
3. How does earth retains most of the atmosphere.
4. Definestrain and give its unit.
5. What is a point object?
SECTION-B
6. What is inertial frame of reference?
7. Explain how proper inflation of tiers saves fuel.
8. State work energy theorem.
9. A car of masses 800kg is traveling around a circular path of radius 200m with a steady speed of 60kmph-1 .calculate its angular momentum.
10. A bus moving with a speed of 50kmph-1 negotiates a level circular road of radio us 20 met. What should be the co efficient of friction so that the bus may not skid off the road?
SECTION-C
11. What is parallax?.Use this method to measure the the distance of places and stars from earth.
12. Write any four properties of electromagnetic force.
13. Test the correctness of the equation using dimensional analysis.
S=ut+1/2at2
14. using graphical method derive the equations of motion
I).v=u+at ii).v2=u2+2as.
15. A cricketer can through a ball to a maximum horizontal distance of 200m. How much high above the ground can he throw the same ball.
16.A bullet weighing 10g is fired with a velocity of 800ms-1,after passing through a mud wall 1m thick, its velocity decreases to 100ms-1.find the average resistance offered by the wall.
17. Derivean expression for the rotational K.E .and hence define moment of inertia.
18. State parallel and perpendicular axis theorem.
19. Determine the escape velocity of a body from the moon. Take the moon to be a uniform sphere of radius 1.74x106m.mass of the moon 7.4x1022kg.
20. Explain three modulus of elasticity.
21.Alaser beam at moon returns after 2.56s from moon. What is the radius of the orbit of moon around the earth?
22. what are the limitations of dimensional analysis.
SECTION-D
23Kumaran went to a shop near his house on a bi-cycle.the bi-cycle made a lot of noise when he pedaled it. After coming home; he applied some oil on some parts of the bi cycle. Now there is no noise. Why?
SECTION-E
24. What is projectile? Obtain a expression for i).maximum height ii).time of flight iii) horizontal range when a projectile is fired at an angle Q with the horizontal.
Or
A jet makes a horizontal loop with a velocity of 800kmph-1, find the radius of the loop if the wings of the jet are baked at 20 degree.
25. discuss the elastic collision between two balls in one dimension and obtain the expression for their velocities after collision.
Or
What do you understand by the law of conservation of energy? Prove the law of conservation of mechanical energy by taking the case of a freely falling body.
26. What do you understand by escape velocity? Derive an expression for the same.
Or
a).state keplers laws laws of planetary motion b).prove that g=GM/R2.
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