PPSC Physics Chapter 1 MECHANICS With Answers

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PPSC Physics Chapter 1 MECHANICS

Sr. # Questions Answers Choice
1 Which quantity has different units from the other three. Density x volume x velocity Rate of change of momentum Young's modulus x area Weight
2 Which base units would be needed to express the SI unit of potential difference. Kg and A only m , s and A kg, m, s and A mg, m and s
3 Which of the following quantities has a unit that can be expressed in terms of just two different SI Units. Area Charge Force Current
4 The international acceptable scientific notation of a number 123.4 is 12.34 x 10<sup>1</sup> 1.234 x 10<sup>2</sup> 1.234 x 10<sup>3</sup> 0.123 x 10<sup>3</sup>
5 92.65 is round off as 92.6 93.00 92.7 None of these
6 In scientific notation 0.0003 can be written as. 3 x 10<sup>4</sup> 3 x 10<sup>-4</sup> 3.0 x 10<sup>3</sup> 3.0 x 10<sup>-3</sup>
7 The number of 0.0001 is abbreviated correctly by 1 x 10<sup>4</sup> 10<sup>-3</sup> 10<sup>-4</sup> 0.1 x 10<sup>4</sup>
8 The magnitude of the resultant of two forces may be increased by Increasing the angle between them Decreasing the angle between them Drawing the parallelogram to represent them Drawing the force perpendicularly
9 The SI unit of gravitational constant G is. kg m-1 s-1 kg m2 s-2 kg m3 s-2 kg m2 s-1
10 Express the quantity 225 x 10-6 s using prefixes. 0.225 micro second 2.25 micro second 225 micro second 2,25 neno second
11 The number 0.02 x 10-8in standard form will be written as. 2 x 10<sup>-10</sup> 2 x 10<sup>-8</sup> 20 x 10<sup>-8</sup> 20 x 10<sup>-6</sup>
12 Which of the following quantities has three significant figures. 3.0066 m 5.05 x 10<sup>-27</sup> kg 301.0 s 1.009 m
13 Which of the following physical quantity has different units as compared to others. Weight of a body Tension of a string Buoyant force Electromotive force
14 Which of the following is SI base unit for temperature. Celsius Kelvin Fahrenheit Rankine
15 Out of the following pairs, which one does not have te same dimensions. Force and weight Pressure and stress Energy and work Momentum and torque
16 The SI unit of momentum is. kg m s-2 kg m2 s-2 kg m s-1 kg s-1
17 The SI unit of density is. kg m2 kg m-2 kg m-3 kg m2 s-2
18 The dimensions of work are [MLT-2] [ML2T-2] [ML2T-1] [MLT-1]
19 The dimension of momentum is. [MLT-1] [ML2T-2] [ML3T-2] [MLT-1]
20 The SI unit of coefficient of viscosity of kg m s-1 kg m-1 s-1 kg m-1 s-1 kg ms -2
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