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Understanding Hooke's Law: The Foundation of Elasticity| Chapter 5 Physics 9th

HOOKE'S LAW   Introduction In physics, Hooke's Law is one of the fundamental principles governing how objects deform under external forces . Named after the 17th-century British physicist Robert Hooke, this law provides a crucial understanding of the behavior of elastic materials, such as springs and rubber bands. Whether stretching a rubber band or compressing a spring, Hooke's Law helps explain what happens when forces act on these materials. What is Hooke's Law: Hooke's Law states that the force F needed to extend or compress a spring by some distance x is proportional to that distance. Mathematically, it is expressed as: F= -kx Here k represents the spring constant, which is the measure of the stiffness of the spring, and x is the displacement from the displacement position.  The negative sign indicates that the force exerted by the spring is in the opposite direction of the displacement.  Understanding the Spring Constant: The spring constant k is a critical co
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Physics Past Papers 2018 MUET

  

MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY JAMSHOR PAST PAPER 2018 (PHYSICS)

1.     We can write 1 kilo as ________.

a.     106             b. 109               c. 103               d. 102

2.     In MKS System, the unit of pressure is

a.      Mm of Hg             b. Pascal                     c. Atmosphere             d. Dyne/m2

3.    If a vector is denoted by , then its x-component will be

a.    Asin                   b. Acos                    c. Acos                   d. Asin

4.    If i, j, k are the unit vectors, along x, y and z-axis then 

a.      1                            b. -                             c. -1                             d. 0

5.    The unit vector of a vector  of magnitude 2 is

a.      A2                          b. 2A                           c.                               d. 

6.     The mathematical form of Newton’s Second Law of Motion is

a.      m=                       b. m=aF                       c. F==                       d. m== 

7.     Elastic collision is  that collision during which

a.      Momentum remains conserved

b.     Energy remain constant

c.      Mass is conserved

d.     Both A and B

8.    When an object is thrown upward, making an angle  with the horizontal and move freely under the action of gravity is called

a.      Horizontal             b. Vertical                   c. Projectile                d. None of these

9.     The body is said to be in equilibrium, if sum of all the forces and torques equal to

a.      One                       b. zero                                    c. Equal                       d. Four

10.  The satellite remains in the orbit around the earth due to centripetal force provided by

a.      Gravitational Force of sun

b.     Gravitational force of the earth

c.      The rocket engine attached to the satellite

d.     None of above

11.  The force which is responsible for the motion of the planets around the sun

a.      Gravitational force     b. Centripetal force           c. Electrostatic force     d. N.O.T

12.  The field is said to be conservative field, if work done along the closed path is

a.      Positive                       b. Negative                       c. zero                         d. Maximum

13.  The SI unit of Energy is

a.      Calorie                        b. Joule                             c. slugs                        d. eV

 

14.  The S.I unit of the intensity of sound is

a.     Watt/m2               b. Erg/m2                                                      c. Joule/s2       d. Dyne/cm2.sec

15.  The distance between two consecutive nodes and antinodes is same or equal to

a.     Half of the wavelength

b.     Double of the wavelength

c.      One complete wavelength

d.     Three times the wavelength

16.  In Michelson interferometer wavelength of the light is given by

a.    d=mλ                     b. d=2mλ                                 c.              d. None of these

17.   The velocity of electromagnetic waves and the velocity of the light have ____ value.

a.      Different               b. Opposite                             c. Same           d. None of these

18.  The internal energy of the fixed mass of an ideal gas depend upon

a.      Pressure                b. Temperature                     c. Volume       d. None of these

19.  The charge which is used to produce an electric field

a.      Electric field         b. Field charge                                  c. Electric Intensity   d. Test charge

20.  The average velocity of an electron gained by the electrons in a conductor placed in an electric field is

a.     Variable velocity              b. Drift velocity                     c. Phase velocity    d. NOT

21.  Resistance of a conductor is directly proportional to the ----

a.      Length                              b. Cross-sectional area           c. Magnetic field   d. Diameter

22.  A transformer is used to

a.     Transform alternating voltage

b.     Convert DC to AC

c.      Convert AC to DC

d.     Convert mechanical energy to electrical energy

23.  The wheat stone-bridge is most sensitive when

a.     Ratio arm is equal to one

b.     Ratio arm is is equal to ten

c.      Both A &  B

d.     Any value

24.  A conductor is a substance, which contain ______ electrons.

a.     Electric                 b. Open                       c. Close                       d. Free                 

25.  A photoelectric cell works on the principle of the

a.     Compton effect     b. Photoelectric effect           c. Photo refraction    d. ɣ-rays counter                     

   

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