11th physics quarterly question paper 2019
Answers
Answer:
Explanation:
1. One of the combinations from the fundamental physical constants is hcG, The unit of this expression is
(a) Kg2 (b) m3 (c) S-1 (d) m
Which is deals with the study of materials of an intermediate length scale.
(a) Macroscopic physics (b) Macroscopic physics (c) Microscopic physics (d) All the above
one parallactic second is,
(a) 3.08 x 1016 m (b) 1.49 x 1011 m (c) 9.46 x 1015 m (d) 1.66 x 10-27 m
2. Which one of the following Cartesian coordinate systems is not followed in physics?
(a) (b) (c) (d)
3. A book is at rest on the table which exerts a normal force on the book. If this force is considered as reaction force, what is the action force according to Newton's third law?
(a) Gravitational force exerted by Earth on the book (b) Gravitational force exerted by the book on Earth (c) Normal force exerted by the book on the table (d) None of the above
4. A heavy iron rod of weight W is having its one end on the ground and the other on the shoulder of a man. The rod makes an angle ፀ with the horizontal. What is the weight experienced by the man?
(a) W sin ፀ (b) W cos ፀ (c) W (d) W2
5. In the arrangement shown in figure coefficient of friction between the two blocks is μ=12 The force of friction acting between the two blocks is:
(a) 8 N (b) 10 N (c) 6 N (d) 4 N
6.The product of mass and velocity is
(a) force (b) impulse (c) momentum (d) acceleration
7.The centripetal force is
(a) mv2r (b) rω2 (c) both (a) and (b) (d) none
8. A particle is projected at an angle of 60° to the horizontal with a kinetic energy E. The kinetic energy at the highest point is
(a) E (b) E2 (c) E4 (d) zero
9. When a mass is rotating in a plane about a fixed point its angular momentum is directed along
(a) A line perpendicular to the plane of rotation (b) The radius (c) The tangent to the circle (d) An angle of 45° to the plane of rotation
10. If a gymnast sitting on a rotating stool, with his arms out stretched, suddenly lowers his hands:
(a) the angular velocity decreases (b) his moment of Inertia decreases (c) the angular velocity stays constant (d) the angular momentum increases
11. The radius of gyration of a solid sphere of radius r about a certain axis is r. The distance of that axis from the centre of the sphere is
(a) 25r (b) 25√r (c) 0.6−−−√r (d) 53√r
12. Infinitesimal quantity means
(a) collective particles (b) extremely small (c) nothing (d) extremely larger
13. Moment of inertia of a body is a
(a) variable quantity (b) invariable quantity (c) constant quantity (d) measure of torque
14. Show that a screw gauge of pitch 1 mm and 100 divisions is more precise than a vernier caliper with 20 divisions on the sliding scale.
15. Define unit of a physical quantity?
16. A particle is projected at an angle of 6 with respect to the horizontal direction. Match the following for the above motion.
(a) vx - decreases and increases
(b) vy - remains constant
(c) Acceleration - varies
(d) Position vector - remains downward
17. Calculate the displacement vector if r1→=x1i⃗ +y1j⃗ +z1k⃗ ,r2→=x2i⃗ +y2j⃗ +z2k⃗
18. How to verify Newton's third law, using spring balances?
19. A small particle of mass m is projected with an initial velocity v at an angle θ with x-axis in X-Y plane as shown in Figure.
Find the angular momentum of the particle.
20. Convert a velocity of 72 kmh-1 into ms-1 with the help of dimensional analysis.
21. Consider two masses of 10g and 1 kg moving with the same speed 10ms-
1.Calculate the magnitude of the momentum.
The diagram shows an estimated force-time graph for a baseball struck by a bat. Then find
(i) Impulse
(ii) Force
(iii) Maximum force
22. How will you measure the work done? When
(i) the force acts along the direction of motion of the body and,
(ii) the force is inclined to the direction of motion of the body?
23. Mention any two physical significance of moment of inertia
24. Give the physical significance of moment of inertia. Explain the need of fly wheel in Engine.
25. The value Gin CGS system is 6.67 x 10-8 dyne cm2 g-2. Calculate the value in SI units.
The parallax of a heavenly body measured from two points diametrically opposite on equator of earth is 2'. Calculate the distance of the heavenly body. [Given radius of the earth = 6400 km] [1" = 4.85 x 10-6rad]
26. Describe Galileo's experiments concerning motion of objects on inclined planes?
27. Explain with graphs the difference between work done by a constant force and by a variable force
28. Derive an expression for kinetic energy in rotation and establish the relation between rotational kinetic energy and angular momentum.