PPSC Physics Chapter 1 MECHANICS With Answers

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PPSC Physics Chapter 1 MECHANICS

Sr. # Questions Answers Choice
1 A force of 20 N is applied on an elastic spring if the extension produced in the springs to cm, the value of spring constant. 2 Nm-1 20 N m-1 200 N m-1 2,000 N m-1
2 Simple harmonic motion may be assumed as a projection of uniform circular motion along a Diagonal Hypotenuse Radius Diameter
3 Angular frequency time period and frequency in SHM do not depend upon. Mass Force constant Amplitude All of these
4 Which of the following is conserved in SHM K.E. P.E Total energy Electrical energy
5 In simple harmonic motion it is found that the total energy of a system. Is independent of the amplitude Depends on the amplitude squared Is independent of the mass All of these
6 An example of forced oscillation is the pendulum of a clock The wind screen wiper A plucked sonometer wire A sonometer wire excited by a tuning fork
7 If there are no frictional effects, the mechanical energy of a system executing simple harmonic motion. Changes with time Is variable Is constant Is not conserved
8 In microwave ovens, heating is produced by the phenomena of Reflection Refraction Damped oscillations Resonance
9 Simple harmonic motion is a type of rectilinear motion Circular motion Rotational motion Zig Zag motion
10 Time period of a simple pendulum depends upon. Thickness of the thread Mass of the pendulum Length of the pendulum Amplitude of vibration
11 An example of simple harmonic motion is Fast moving cricket ball Motion of bicycle Motion of a bee Motion of simple pendulum
12 Periodic motion is a motion. Under the influence of an elastic restoring force That repeats it self in equal intervals of time Back and forth over the same path With constant acceleration
13 The weight of a man in an elevator moving down with an accelerating of 9.8 m s-2 will be come Half Zero 9.8 N Double
14 A man of mass 100 kg is standing in an elevator. The net force acting on the man reads its weight when the elevator is going up with acceleration 4 m s-2 would be. 100 N 590 N 490 N 980 N
15 A body of mass 2 kg is suspended in a elevator by means of a spring The balance reads its weight when the elevator moves up with an acceleration of 5 m s-2 as. 9.8 N 29. 6 N 26.5 N <div>30.5 N</div>
16 If an elevator is moving vertically up with an acceleration 'a' the force exerted on the floor by a passing of mass 'm' is Ma Mg M(g +a) M (g-a)
17 Which statement for geostationary orbit is false. A geostationary orbit must be directly above the equator All satellites in a geostationary orbit must have the same mass The period of a geostationary orbit must be 24 hours There is only one possible radius for geostationary orbit
18 Which of the following is a unit of electric field strength. c m-1 v m-2 N C-1 N V-1
19 When a force of 16 N acts on a mass of 4 kg for a time of 4 s. What is the rate of change of momentum. 1 kg m s-2 4 kg m s-2 8 kg m s-2 16 kg m s-2
20 A force of 50 N acts on a body for 10 s the change in momentum will be. 5 N s 200 Ns 500 Ns 800 N s
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