PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 when a body accelerates. Its direction always changes Its mass always changes Its velocity always changes It falls towards the earth
2 A force of 100 N acts on body of mass 5 kg for 10 s. The velocity of the body will be. 2 ms -1 20 m s-1 200 ms-1 2.000 m s-1
3 The action and reaction forces Must act upon the same body Must act upon different bodies Must be equal in magnitude but need not have the same line of action. Different speed at the different height during ascent and during descent.
4 Newton's first law of motion provides the definition of. Distance Force Vector Acceleration
5 The reluctance of a body to start moving is called. Mass Weight Force Inertia
6 If a ball was thrown out of a rocket in free space, then it would. Accelerate away from the rocket Remain motionless after leaving the rocket Travel rectilinearly with constant speed Move always parallel to the rocket
7 When a man jumps off the ground, the reaction force of the ground is. Equal to the weight of the man. Smaller than the weight of the man Greater than the weight of the man Zero
8 Inertial mass and gravitational mass are Opposite Proportional Weights Inversely proportional
9 The mass that appears in Newton's second law is known as. Rest mass Gravitational mass Inertial mass Weight
10 It the force acting on a body is doubled its acceleration becomes. Half Constant Double One fourth
11 If a body is moving with constant velocity then Its acceleration is zero Its direction may be changing Its speed may be changing Its acceleration is constant
12 If slope of velocity time graph gradually decreases, then a body is said to have Negative acceleration Positive acceleration Uniform velocity Variable velocity
13 The cross product of two vectors is magnitude when Vectors are parallel Vectors are antiparallel Vectors are perpendicular They are rotated through 270<sup>o</sup>
14 The scalar product of two vectors in negative when Vectors are parallel Vectors are antiparallel Vectors and perpendicular Vectors are parallel with same magnitude
15 Which pair of the following forces has a resultant force of 2 N. 1 N and 1 N 1 N and 3 N 1 N and 2 N 2 N and 2 N
16 The reverse process of vector addition is called Negative of a vector Subtraction of vectors Resolution of vectors Multiplication of vector
17 If the resultant of two forces, each of magnitude F have the magnitude F, angle between the forces will be. 30<sup> o</sup> 80<sup> o</sup> 90 <sup>o</sup> 120 <sup>o</sup>
18 The magnitude of resultant of three force is 3. If its x-component is 2, Y component is 1. Its 2-component will be. 1 2 3 4
19 Which one of the following is not true. velocity can be negative velocity is a vector Speed is a sccalar Speed can be negative
20 The resultant magnitude of two vectors Is always positive Can never be zero Can be negative positive or zero Is usually zero
21 Which vector gives the displacement from one point to another in space. Position vector Unit vector Null vector Distance vector
22 Vectors are ofhen spilt into two or more orthogonal components what is true of these components. they are perpendicular They are parallel They are antiparallel They have same magnitude
23 Which are the two basic properties of a vector. Curvature and direction Magnitude and direction Magnitude and sign Curvature and sign
24 When two vectors have opposite directions we say that they are Parallel Antiparallel Perpendicular Out of phase
25 If two non zero vectors are perpendicular to each other than their scalar product is equal to 1 -1 0 infinity
26 Two vectors of magnitudes 5 N and 7 N respectively are acting on a body if the angle between them is a right angle, their resultant vector will be. 2 N 4 N 6 N 8 N
27 A force of 10 N is acting along z-axis, its component along x -axis and y-axis is 2 N , 8 N 3 N, 7 N 5 N each Zero
28 If a force of 50 N is acting along x axis , then its component along y-axis will be. Zero The same Of the half magnitude Of the double magnitude
29 The magnitude of resultant of three forces is 3. Its x -component is 2 and y component is 1, then its z-component will be. 1 2 3 4
30 If two non zero vectors are perpendicular to each other then their scalar product is equal to. -1 1 0 Infinity
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