Five Year Papers

1.       There is no difference between the rotatory motion and the circular motion.

2.       The velocity of sound waves increases with temperature.

3.       The stationary waves are produced due to the superposition of two identical waves travelling in opposite directions.

4.       The interference and diffraction patterns are exactly the same

5.       In an elastic collision, energy is conserved but not the momentum.

6.       In an inelastic collision, momentum is conserved but not the momentum.

7.       A free vector is one, which can change its direction.

8.       The objects falling freely to the earth move in the same direction.

9.       The real images formed by a convex lens are always inverted and on the same side of the lens as the object.

10.   A body possesses potential energy only when it exists in the earth’s or some other body’s gravitational field.

11.   The moon is freely falling to the earth.

12.   An astronaut in a spacecraft experiences weightlessness because the earth’s gravitational force ceases to act on him.

13.   Both the centre of mass and centre of gravity of a body are at one and the same point in a uniform gravitational field.

14.   Sound waves cannot be polarized.

15.   If two tuning forks 100 Hz and 120 Hz are sounded together the number of beats heard per second will be 20.

16.   It is not possible to photograph a virtual image.

17.   The motion of an airforce soldier descending with a parachute is a free fall motion.

18.   There is no effect of the change of temperature on the velocity of sound.

19.   Work done in a gravitational field is independent of the path.

20.   The image formed by a convex lens for the different positions of the object is always real.

21.   An inelastic collision is thath in which the momentum and the kinetic energy are conserved.

22.   An oscillatory motion in which the acceleration is proportional to the force is called a simple harmonic motion.

23.   The time period of a pendulum depends on the length of the pendulum.

24.   Weightlessness is overcome in spacecraft by creating artificial gravity.

25.   Beats are produced due to the superposition of two waves of the same frequency.

26.   One of the conditions for interference of light is that the sources of light must be in phase coherence.

Chapter 1

The Scope of Physics

1.      Screw and liver was invented by Newton.

2.      Pythagouras was famous in mathematics.

3.      Logarathim was invented by Al-Beruni.

4.      Omer Khyyam was mathematician and he was also a poet.

5.      Pin hole camera was invented by Al-Razi.

6.      Ibn-e-Sina was famous for his work in chemistry.

7.      Al-Razi wrote about 200 books.

8.      20^th century is the century of Physics.

9.      Dimension of volume is L³.

10.  Dimension of Linear momentum is MLT^-1.

11.  9.8 contain two significant figures.

12.  In C.G.S system the fundamental units of length, mass and time are kg, km and hour.

13.  In British Engineering system the unit of force, length and time are chosen as the fundamental unit.

14.  In M.K.S system unit of mass is pound.

15.  Candela is the unit of luminous intensity.

16.  The branch of physical science, which deal with interaction of matter and energy, is called physics.

17.  The biological science deals with non-living things.

18.  The class of science, which deals with the properties, and behaviour of living things is called physical science.

19.  Ibn-e-Sina was famous in the field of mathematics.

20.  In C.G.S system the unit of force is pound.

21.  In the field of research the strong incentive comes from Bible.

22.  The new era of modern physics began near the end of 19^th century.

23.  Al-Khwarizmi was the founder of analytical algebra.

24.  Egyptian for the first time manufactured paper.

25.  Chinese used to measure the flood level in the river Nile.

26.  Ibn-e-Sina was a great astronomer.

27.  The author of Alsh-Shifa was Al-Beruni.

28.  The author of Al-Qannun-Fil-Tib was Ibn-e-Sina.

29.  Yakoob- Bin Ishag Al-Kindi wrote many books on the mathematics, astronomy, medicine and other subjects.

30.  In atomic clock the time be measured to an accuracy of part in 10¹².

31.  The unit of electric current is coulomb.

32.  The SI unit of thermodynamic temperature is celsius.

33.  The dimension of area is L^-2.

34.  The dimension of force is MLT^-2.

35.  14.71 has four significant figures.

Chapter 2

Scalars and Vectors

1.      A physical quantity, which can be completely described by its magnitude only, is called scalar quantity.

2.      A physical quantity, which can be completely specified by its magnitude as well as direction, is called vector quantity.

3.      Displacement of a body is a scalar quantity.

4.      Power is a vector quantity.

5.      Vectors can be represented by capital letters like .

6.      Magnitude of vectors can be represented as  or A, B, C.

7.      Two vectors are equal when they have same magnitude and same direction.

8.      The tail of a vector is also called the terminal point.

9.      The magnitude of a vector will always be negative.

10.  In parallelogram law of vector addition the resultant of the two vectors is represented by any adjacent side of the parallelogram.

11.  Normally law of cosine is used to determine the magnitude of the resultant vector.

12.  Law of sine is used normally for the direction of a resultant vector.

13.  The division of vectorby negative number n is given by where m = 1/n then the direction ofis same as .

14.  The magnitude of unit vector will always equal to unity.

15.  The rectangular unit vectors  are mutually perpendicular to each other.

16.