SAMPLE QUESTION PAPER 11th.docx

**SECTION -- A** ***(Question 1 to 20 carry 1 marks each)*** **Q.1: Young's modulus of steel is 1.9 ×× 10^11^ N/m^2^. When expressed in CGS units of dynes/cm^2^, it will be equal to (1N = 10^5^ dyne, 1m^2^ = 10^4^ cm^2^)** **a) 1.9 ×× 10^10^ b) 1.9 ×× 10^11^ c) 1.9 ×× 10^12^ d) 1.9 ×× 10^13^** *...

**SECTION -- A** ***(Question 1 to 20 carry 1 marks each)*** **Q.1: Young's modulus of steel is 1.9 ×× 10^11^ N/m^2^. When expressed in CGS units of dynes/cm^2^, it will be equal to (1N = 10^5^ dyne, 1m^2^ = 10^4^ cm^2^)** **a) 1.9 ×× 10^10^ b) 1.9 ×× 10^11^ c) 1.9 ×× 10^12^ d) 1.9 ×× 10^13^** **Q.2: Centre of gravity can be defined:** **a) as that point where the total gravitational torque on the body is greater than zero** **b) as the center of mass** **c) as that point where the total gravitational torque on the body is zero** **d) as that point where the total gravitational force on the body is zero** **Q.3: What will be the height of a liquid column in a capillary tube on the surface of the moon?** **a) 1/6th of what was on earth's surface b) Six times that on the earth's surface** **c) It will remain unchanged d) 36 times that on earth's surface** **Q.4: A jet Plane starts from rest with an acceleration of 3ms^-1^** and makes a run for 35 ms before taking off. The velocity of the jet at take-off will be - a\) 105 m/s b) 95 m/s c) 75 m/s d) 50 m/s **Q.5: Which of the following is constant in a projectile motion?** **(a) Velocity of projection (b) Horizontal component of the velocity** **(c) Vertical component of the velocity (d) All of these** **Q.6:** Two projectiles are projected with the same velocity. If one is projected at an angle of 30° and the other at 60° to the horizontal, then the ratio of maximum height reached is -- a\) 3:1 b) 1:3 c) 1:2 d) 2:1 **Q.7:** A satellite is revolving around the earth with a kinetic energy E. The minimum addition of kinetic energy needed to make it escape from its orbit is: a\) E b) 2E c) E/2 d) √E **Q.8:** Which one of the following is a dimensional constant? a\) Refractive index b) Dielectric constant c) Relative density d) Gravitational constant **Q.9:** Which is the type of collision in which both the linear momentum and the kinetic energy of the system remain conserved? a\) Inelastic Collision b) Elastic Collision c) Destructive collision d) None **Q.10:** If a body of mass m collides head on, elastically with velocity u with another identical body at rest. After collision velocity of the second body will be: a\) Zero b) u c) 2u d) data insufficient **Q.11: A particle is moving in a circular orbit with constant speed. Select wrong alternate.** **a. Its linear momentum is conserved. b. Its angular momentum is conserved.** **c. It is moving with variable velocity. d. It is moving with variable acceleration** **Q.12:** A couple produces: a\. Purely linear motion b. Purely rotational motion c. Linear and rotational motion d. No motion **Q.13: A wheel is rotating at the rate of 33 rev/min. If it comes to stop in 20 s. Then, the angular retardation will be** **a. π/2 rad/s² b. 11π/2 rad/s² c. 3π/200 rad/s² d. 11π/200 rad/s²** **Q.14: The angle between A the resultant of (A+B) and (A−B) will be** A. **tan−1 (A/B) (B) 0 (C) tan−1 (B/A) (D) 60** **Q.15: What is the number 75.66852 rounded off to 5 significant digits?\ a) 75.67 b) 75.669 c) 75.668 d) 75.667** **Q.16: A particle moving in a straight line covers half the distance with speed 6 m/s. The other half is covered in two equal time intervals with speeds 9 m/s and 15 m/s respectively. The average speed of the particle during the motion is : (3)** **(A) 9.2 m/s (B) 8.8 m/s (C) 10 m/s (D) 8 m/s** **Question No. 17 to 20** consist of two statements -- Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: a\) Both A and R are true, and R is the correct explanation of A. b\) Both A and R are true, and R is not the correct explanation of A. c\) A is true but R is false. d\) A is false but R is true **Q.17: Assertion (A): Speed is constant in uniform circular motion.** **Reason (R): Acceleration is constant in uniform circular motion.** **Q.18: Assertion (A):** In Javelin throw, the athlete throws the projectile at an angle of 45° for maximum range. **Reason (R):** The maximum range does not depend upon the angle of projection. **Q.19: Assertion: A bullet is fired from a rifle. If the rifle recoils freely, the kinetic energy of rifle is more than that of the bullet.\ Reason: In case of rifle bullet system, the law of conservation of momentum violates** **Q.20: Assertion: A cyclist always bends inwards while negotiating a curve.\ Reason: By bending, cyclist lowers his centre of gravity** **SECTION -- B** ***(Question 21 to 26 carry 2 marks each)*** **Q.21: Name the part of brain which is responsible for the following actions:** **(i) Maintaining posture & balance (ii) Beating of Heart (iii) Thinking (iv) Blood Pressure** **Q.22:** State the post-fertilisation changes that lead to fruit formation in plants. **Q.23:** What is the purpose of making urine in the human body? Name the organs that stores and releases the urine. Why do arteries have thick and elastic walls whereas veins have valves? **Q.24:**