11. A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act
A. towards the wall at its upper end
B. away from the wall at its upper end
C. downward at its upper end
D. upward at its upper end
12. The length of a second’s pendulum is
A. 94.9cm
B. 99.4cm
C. 100cm
D. 101cm
13. The slope on the road surface generally provided on the curves is known as
A. angle of friction
B. angle of repose
C. angle of banking
D. none of these
14. Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.
A. meet
B. do not meet
15. The moment of inertia of a rectangular section 3cm wide and 4cm deep about X–X axis is
A. 9cm4
B. 12cm4
C. 16cm4
D. 20cm4
16. A pendulum which executes one beat per second is known as
A. simple pendulum
B. compound pendulum
C. torsional pendulum
D. second’s pendulum
17. Two blocks A and B of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.
A. will
B. will not
18. D’ Alembert’s principle basically depends upon Newton’s second law of motion.
A. Correct
B. Incorrect
19. The forces, whose lines of action are parallel to each other and act in the same directions, are known as
A. coplanar concurrent forces
B. coplanar non-concurrent forces
C. like parallel forces
D. unlike parallel forces
20. A number of forces acting at a point will be in equilibrium, if
A. all the forces are equally inclined
B. sum of all the forces is zero
C. sum of resolved parts in the vertical direction is zero (i.e. ∑V = 0)
D. none of these