Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 A body moving along the circumference of a circle of radius R completes one revolution. The radius of a covered path to the angle subtended at the centre is: Radius of the circle Twice the radius Thrice the radius None of these
2 A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be: 49 rad/sec<sup>2</sup> 1 rad/sec<sup>2</sup> 0.16 rev/sec<sup>2</sup> Both A and C Both B and C
3 A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec2in this case, find radius of the circular path: 1 m 5 m 10 m 15 m
4 The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is: 5 rad/sec<sup>2</sup> -10 rev/sec<sup>2</sup> -10 rad/sec<sup>2</sup> -5 rev/sec<sup>2</sup>
5 A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is: 38 m/sec 3.8 m/sec 0.6 m/sec None of these
6 A stone tied to the end of a 20 cm long string is whirled in a horizontal circle. If centripetal acceleration is 9.8 m/sec2, then its angular velocity is rad/sec is: 22/7 7 14 21
7 Centripetal force performs: Maximum work Negative work Positive work None of these
8 A rotating body tends to be slower, when its angular acceleration is: Positive Negative Zero Infinity
9 When body moves along a circular path with constant speed, it has an acceleration, which is always directed; Along the tangent Towards the centre Away from the centre None of them
10 One radian is equal to: 30.3° 45.3° 50.3° 57.3°
11 When angular acceleration is positive, the body rotates: Slower Slowest Faster None of these
12 One radian is: Greater than one degree Less than one degree Equal to one degree None of these
13 Centripetal acceleration is also called ______ acceleration: Tangential Radial Angular None of them
14 Direction of motion ______ in circular motion: Changes off and on Changes continuously Does not change None of them
15 A point on the rim of a wheel moves 0.2 m where the wheel turns through an angle is 14.3 degrees. The radius of the wheel is: 0.05 m 0.08 m 0.8 m 0.008 m
16 Work is product of: Force and velocity Heat and energy Force and displacement None of these
17 A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, Which makes an angle of 60° with the horizontal. The work done by the boy is: 1.25 J 12.5 J 125 J None of these
18 If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents: Power Work Pressure None of these
19 The work done by a force, keeping an object in circular motion with constant speed is: Zero J 1 J 0.1 J 0.01 J
20 Which force is not a conservative force? Frictional force Gravitational force Electric force Elastic spring force
21 A laborer carrying a load on his head moves from the rest on a horizontal road to another point where he comes to rest. He has done: Minimum Work Maximum Work Zero Work Negative Work
22 A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is: 0<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 30<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 60<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 90<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span>
23 A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is: +5 x 10<sup>1</sup>J +5 x 10<sup>2</sup>J +5 x 10<sup>3</sup>J +5 x 10<sup>4</sup>J
24 When a body moves against the force of friction on a horizontal plane, the work done by the body is: Positive Negative Zero None of these
25 In the force applied to parallel to the direction of motion, then the work done is: Positive Negative Zero None of these
26 A 2 kg block is held 1 m above floor for 50 seconds. The work done is: Zero 10.2 J 100 J 980 J
27 Work done in lower and bucket into the well is: Zero Positive Negative None of these
28 A field in which the work done is moving a body along closed path is zero is called: Nuclear filed Conservative field Gravitational field Non-conservative field
29 When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is: 2 J 0.25 J 1 J 0.5 J
30 The work done in moving a body between two points in a conservation field is independent of the: Direction Force applied Path followed by the body Power
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