Class 11 Physics (2020) Test M.M 70
section A - 1-10 very short answer 1 mark 11-14 1 mark, section B-1 case study 2 marks , 10 short answer 2 marks section C five questions three marks, section D- 3 questions 5 marks, one 4 mark question.
Section-A
Q1 Why it is desired to hold a gun tight to one’s shoulder when it is being fired?
Q2 How many parsec are there in one metre?
Q3 What is dimensional formula for angular momentum and gravitational constant?
Q4 What will be the net effect on maximum height of a projectile when its angle of projection is changed from 30° to 60°, keeping the same initial velocity of projection?
Q5 An artificial satellite revolving around the earth does not need any fuel. On the other hand,the aeroplane requires fuel to fly at a certain height.why?
Q6Can there be motion in two dimensions with an acceleration only in one direction?
Q7 In stretching a wire, work has to be performed. Why?
Q8 The angle between vectors A and B is 60°. What is the ratio of A.B and |A x B|?
Q9 If the distance covered by a moving object varies directly as the time, what conclusions could you draw about the motion and the forces?
Q.10 Define gravitational potential and gravitational field strength. Also write SI units.
Q11 Assertion: During a turn, the value of centripetal force should be less than the limiting friction
Reason: The centripetal force is provided by the frictional force between the tyres and the road.
Q12 Assertion: A man who falls from a height on cement floor receives more injury than when he falls from the same height on a heap of sand.
Reason: The impulse applied by a cement floor is more than the impulse by sand floor.
Q.13Assertion: The value if acceleration due to gravity does not depend upon mass of the body on which force is applied.
Reason: Acceleration due to gravity is a constant quantity.
Q14 Assertion: A frame moving in a circle with a constant speed can never be inertial frame.
Reason: It has a constant acceleration
Q15 Case study: Look at the graphs (a) to (d) carefully and state, with reasons, which of these cannot possibly represent one-dimensional motion of a particle.
Q.17 A body weighs 63 N on the surface of the earth.what is the gravitational force on it due to the earth at a height equal to half the radius of the earth?
Q18 A block of mass M held against a rough vertical wall by pressing it with a finger. If the coefficient of friction between the block and the wall is u and the acceleration due to gravity is g. Calculate the minimum force required to be applied by the finger to hold it?
Q19 A police van moving on a highway with speed of 30km/h fires a bullet at a thief’s car speeding away in the same direction with a speed of 192km/h. If the nuzzle speed of the bullet is 150m/s, with what velocity does the bullet hit the thiefs car?
Q20 The rotational kinetic energy of a body is given by E=1/2Iw^2, where w is the angular velocity of the body.Use this expression and obtain dimensional formula for moment of inertia also write its SI unit?
Q21 Obtain an expression for orbital velocity and time period of satellite?
Q22Force of 16N and 12N are acting on a mass of 200kg in mutually perpendicular directions.Find the magnitude of the acceleration produced?
Q23Derive i) v^2 = u^2 + 2as. ii) S=ut + 1/2at^2 using calculus method?
Q24Show that cross product of two parallel vectors is zero.
Q25 Calculate the power of a crane in watts, which lifts a mass of 100kg to a height of 10m in 20s.
Q.26 A stone dropped from the top of cliff and is found to travel 44.1 in the last second before it reaches the ground. What is the height of the cliff?
Section-C
Q27 Observation of diameter of metal rod are :0.39,0.38,0.37,0.41,0.38,0.38,0.37,0.40,0.39mm calculate true value,absolute error,relative and percentage error.
Q28 The position of a particle is given by r vector= 3ti-2t^2j +4k m, where t is in seconds and the coefficients have proper units for r to be in metres. Find the velocity and acceleration of the particle at t= 2s
Q29Two uniform solid spheres of radii R and 2R are at rest with their surfaces just touching.Find the force of gravitational attraction between them if density of spheres be p.
Q30 prove that elastic energy density is equal to 1/2stress x strain.
Q31 Derive an expression for acceleration of an object in uniform circular motion and hence give expression for centripetal force.
Section-D
Q32 Derive an expression for acceleration due to gravity at surface, at height(with specialcase), at depth. With diagram
Q33 Derive and expression for maximum height, horizontal distance and time of an object doing projectile motion with diagram
Q34 Explain the terms static and kinetic friction with help of diagram, also write formulas. What is meant by angle of repose give its expression. (4)
Q35 State and expalin Hooke’s law.A wire is fixed at one end and is subjected to increasing load at the other end. Draw a curve between stress and strain. With the help of it explain the terms elastic limit, yield point, breaking point . How does this curve may be used to distinguish between ductile and brittle substances?
Comments
Post a Comment
If you have any doubts, let me know...